T25%201971%20Workshop%20Manual%2099 0945%20x[1]
User Manual: T25%201971%20Workshop%20Manual%2099-0945%20x[1]
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WORKSHOP
}IANUAt
FOR
250c.G.
(l 5cu.in.)
SINGLE
CYLINDER
@ Copyright
by
TRIUMPH E]{GINEERING CO. LTD.
MERIDEN WORKS . ALLESLEY . COVENTRY CVs 9AU .ENGLAND
TELEPHONEz
TELEX: ..TRUSTy" 3130S
TELEGRAMS: ..TRUSTy', COVENTRY
0203-20221
Published July 197'l
Publication Part
www.bsaunitsingles.com
No.
99-0945
,'€
._-*_.*J-\
IMPORTANT NOTE
Any modifications to anyTriumph motorcycle made by you or to be
made by you in the future shall be held by our company to have been
modified at your own risk and responsibility and without either the
explicit or implied consent of Triumph Engineering Co. Ltd. or
Triumph Motorcycle Corporation. We will assume no liability,
obligation or responsibility for any defective or modified parts or
for the modified motorcycle itself, or for any claims, demands or
legal action for property damage or personal injuries which may
result from the modification of any Triumph motorcycle.
,*:lS'-\
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'l
INTRODUCTION
THIS'manual has been compiled and prepared to provide the necessary service information for workshop,
fitter, technical staff and individual owner, wishing to carry out basic maintenance and repair work on the
TRIUMPH 250 c.c. MODEL T25T and T25SS.
GENERAL DATA for all models within the above range is provided in ready reference form, and a separate
section covering Service Tools is fully illustrated at the end of this manual.
The manual is divided into sections dealing with major assemblies, throughout the machine, each section subdivided into sequence order corresponding to normal operations of strip down, examination and rebuilding
p
roced
u
re.
ENGINE AND FRAME NUMBERS
Note: The engine number is located on the left
On later
side of the engine, immediately below the
changed, and a prefix is added indicating the month
and year of manufacture.
barrel flange. The number
cylinder
is stamped onto a
models
the
system
of
numbering
is
raised pad.
The first letter indicates the month
manufacture as follows:-
A
B
C
D
E
G
H
J
K
N
P
X
of
C
D
E
G
H
J
K
N
P
X
A
B
January
February
March
April
May
June
July
Augusr
September
October
November
December
The third Section is a numerical blocl< of five figures
which conrmence with engine number 001 00.
The fourth Section indicates the model'
Example
The second letter indicates the season
year of manufacture as follows:-
Model
001 00 T25T
Month Yeor Nurnber
N
C
1969
1970
1971
1972
1973
1974
19V5
1976
1977
1978
1979
1980
The frame number is stamped on the reft side of
the frame, on the front engine mounting lug. Both
the engine and frame numbers should coincide.
GUARANTEE
Please refer
to your local dealer or distributor where required for the latest terms of guarantee.
EASTERN U.S.A.
DISTRIBUTORS
TRIUMPH MOTORCYCLE
p.o. Box
6790,
21704.
MARYLAND
Cables: Triumph
CORPORATION,
TowsoN, BALTTMORE 4,
Baltimore.
Telex:87728
WESTERN U.S.A. DISTRIBUTORS
TRIUMPH MOTORCYCLE CORPORATION,
P.O. BOX
275,
EAST HUNTINGTON DRIVE,
DUARTE,
CALIFORNIA 91010.
TELEX:
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675469
FACTORY SERVICE ARRANGEMENTS
UNITED KINGDOM ONLY
CORRESPONDENCE
Technical Advice, Guarantee Claims and Repairs
Communications dealing withany of these subjects should be addressed
to the SERVICE DEPARTMENT.
ln all communications the full engine number complete with all prefix letters and
figures should be stated. This number will be found on the L.H. side of the crankcase
just below the cylinder flange.
TECHNICAL ADVICE
It will be appreciated how very difficult it is to diagnosetrouble by correspondence and this is made impossible
in many cases because the information sent to us is so scanty. Every possible point which may have some bearing on the matter should be stated so that we can send a useful and detailed reply.
REPLACEMENT PARTS
Replacement parts are no longer supplied direct from the factory
obtained from the nearest local Triumph dealer.
to the individual owner. They should
be
There is a nation-wide network of stockists, a list of which is available from the factory on request.
REPAIRS
Before a motorcycle is sent to our Works an appointment must be made. This can be done by letter or
telephone. When an owner wishes to return his machine for guarantee repairs, he should first consult
his Dealer as we do not normally accept machines in our Repair Shop direct from private owners.
Frequently the Dealer can overcome the trouble without the delay and expense of sending the machine to
the Works. This avoids the machine being out of use for some days when it could be on the road. Where
parts such as cylinders, petrol tanks, etc., are forwarded for repair, they should be packed securely so as to
avoid damage in transit. The dealer's name and address should be enclosed together with full instrucrions.
ln the case of complete motorcycles, a label showing the dealer's name and address should always be attached
and all accessories such as tools, inflator, handlebar mirrors and other parts removed.
SERVICE EXCHANGE RECONDITIONED UNITS
A
range of service exchange reconditioned units is available from the Factory Service Department. This
list includes petrol tanks, front forks, front and rear frames, clutch plates, brake shoes, etc., which are
supplied after the return of the original equipment for inspection and acceptance. Operation of this scheme
is maintained solely through the Dealer network.
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CONTENTS
SECTION
GD
GENERAL DATA
LUBRICATION SYSTEM
A
ENGIN
E
B
CARBU RETTER
c
FRAME & ATTACHMENT DETAILS
D
TELESCOPIC FORK
WHEELS, BRAKES
E
& TYRES
ELECTRICAL SYSTEM
SERVICE TOOLS
CONVERSION TABLES
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F
G
J
CT
TRIUMPH 250 c.c. BLAZER SS T25SS (U.S.A. only)
www.bsaunitsingles.com
TRAILBLAZER T25T (U.S.A. only)
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BLAZER SS T25SS (Home and General Export)
www.bsaunitsingles.com
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ENGINE TIMING DISC. PUSH OUT AND USE FOR VALVE TIMING IGNITION SETTING ETC,
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\.
GENERAL DATA
BLAZER SS T25SS (USA)
TRAIL BLAZER T25T
BLAZER SS T25SS (Home and General Export)
250cc. ( 15 cu. ins.)
GD1
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GD
GENERAL DATA
MODEL T25SS-BLAZER SS (USA ONLY)
ENGINE
PISTON
Material
Compression ratio
Clearance (bottom of skirt)
Clearance (top of skirt) ...
(Both measured on malor axis)
HG413 Aluminium alloy
9.5:1
'0023/'0028 in. (.058421.071'1 2 mm.)
.0042/'0053 in. (..106681.13462 mm.)
PISTON RltlGS
(top)
(centre)...
Material-scraper...
Material-compression
Material-compression
Radial
Radial
width-compression (top and centre)
width-scraper.
Depth-compression (top and
Depth-scraper ...
Clearance in
H.G.22 cast iron
H.G.22 cast iron
H.G.22 cast iron
...
0.101510.1074 in. (2.57712.729 mm.)
0'101510.1074 in. (2.57712.729 mm.)
0.0615/0.0625 in. (1 .562711.588 mm.)
0.12410'125 in. (3.14913.175 mrn.)
centre)...
groove
Fitted gap-(maximum) ...
Fitted gap-(minimum) ...
Connecting rod (length between
lnternal dia. of small end...
'00t7.993 in. (.0254/.0762 mm.)
3 in. (.3302 mm.)
.009 in. (.2283 mm.)
5.312 in.'(134.92 mm.)
.6892 in. (j7.51 mm.)
.01
centres)
OIL PUMP
Pump body material
fYp"
Driveratio...
Zinc
Non-return valve spring (free length)
1:4
...
'625 in. (15.875 mm.)
.25 in. (6.35 mm.)
.6094 in. (15.4781 mm.)
'3125 in. (7.9375 mm.)
Non-return valve spring ball (diameter)
Oil pressure release valve spring (free length)
Oil pressure
release valve ball
(diameter)
CAMSHAFT
Journal diameter (right and left-hand)
Cam
Cam
lift (inlet)
lift (exhaust)...
Base
circle radius
base alloy
Double gear
...
.74801.7485 in. (18.9992119.0119 mm.)
.345 in. (8.763 mm.)
.336 in. (8.534 mm.)
.906 in. (23 0124 mm.)
...
CAMSHAFT BEARING BUSHES
..
Bore diameter (fitted)
Outside diameter...
Camshaft clearance
.74921.7497
7 4921.7497 in. (19.0297
(19.0297119.04238
mm.)
119.04238 m
908 1.909 in. (23'0632123.0886 mm.)
'0007
(.01778
0007 l'0017 in.
1.0431 8 mm.)
CRANKSHAFT
End float
VALVES
Seat angle
'002/.00s in. (.0508/.127 mm.)
(inclusive)
90'
ueaa aiamJter (inteil
Head diameter (exhaust)...
Stem diameter (inlet)
Stem diameter (exhaust)...
in. (33.3248/33.4518 mm.)
'3095i.3100 in. (7'86'117:874 mm.)
.3090/.3095 in. (7'848/7.861 mm.)
1'3'1211.317
VALVE GUIDES
Material
Bore diameter
Outside diameter
Length
Hidural
...
Cylinder head interference
5
.31201.3130 in. (7.9248/7.950 mm.)
'5005/.5010 in. (12.7127112.7254 mm.)
1'844 in. (46.8276 mm.)
.0015/.0025 in. (.038'l-3.0635 mm.)
fit ...
VALVE SPRINGS
(inner)
(outer)
Fitted length (inner)
Fitted length (outer)
Free length
Free length
1.400 in.
1.750 in.
1.262 in.
1.370 in.
(35.56 mm.)
(44.45 mm.)
(32.0548 mm.)
(34.798 mm.)
VALVE TIMING
Tappets set to.015 in. (.381 mm.) for checking purposes only:
lnlet opens B.T.D.C.
lnlet closes
A.B.D.C.
Exhaust opens B.B.D.C.
Exhaust closes A.T.D.C.
...
...
TAPPET CLEARANCE CoId
lnlet...
Exhaust
IGNITION TIMING
Piston position (B.T.D.C.) fully advanced
Crankshaft position (B.T.D.C.) fully advanced
contact breaker gap setting
51"
68"
7S
37'
.008 in. (.2032 mm.)
.0'10 in. (.254 mm.)
.342 in. (8'6868 mm.)
37"
.015 in. (.381 mm.)
GD2
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GD
GENERAL DATA
SPARK PLUG
Type
G'.i.etting(minimum/maximumj
Thread size
..'.'
Champion N3
.020/.025 in. (.508/.635 mm.)
14 mm. dia.X.75 in. reach (19.05 mm.)
:::
CYLINDER BARREL
Aluminium alloy with ausrenitic iron
liner
Material
Bore size (standard)
Stroke
Oversizes ...
67 mm.
70 mm.
0'010 and 0.020 in. (0.254 and 0.508 mm.)
CYLINDER HEAD
Material
Aluminium alloy
lnlet port size
Exhaust port size ...
in. (28.575 mm.)
1.25 in. (31'75 mm.)
1.125
CARBURETTER
TyPe
Amal 928/20 (concentric float chamber)
Main jet
Needle jet size
190
.106 in. (2'69 mm.)
Needle position ...
1
Throttle valve
3+
Nominal choke size
28 mm.
Throttle slide return spring (free length)
2'5 in. (63.5 mm.)
BEARING DIMENSIONS
Clutch roller (25)
.1875x.1875 in. (4.7A25x4.7025 mm.)
.0005/.0010 in. (.0127/.0254 mm.)
Con-rod big-end bearing-running clearance...
Con-rod big-end-crank diameter
Crank undersizes ...
Con-rod small-end bush (bore) ...
Crankcase bearing (drive-side) ...
Crankcase bearing (timing-side)
Crankshaft dlameter (drive-side and timing-side) ...
Gearbox layshaft bearings (drive-side and timing-side)
Gearbox layshaft diameter (drive-side and timing-side)
Gearbox mainshaft bearing (drive-side)
Gearbox mainshaft bearing (timing-side)
1.437511.4380 in. (36.5125/36.5252 mm.)
.0i0, .020 and .030 in. (.254, .508 and
.762 mm.)
.68901.6894 in. (17.5006/17.6108 mm.)
25x62x17 mm.
25x62x17 mm.
...
...
Gearbox mainshaft diameter (drive-side)
Gearbox mainshaft diameter (ti.mjng-side)
Gearbox sleeve pinion (internal diameter)
Gearbox sleeve pinion (external diameter)
Gudgeon pin diameter
-984'1
1.9844 in. (24.9961 122'0038 mm.)
0.5x.625x.8125 in. (12.7x'15.875x
20.6375 mm.)
-62451.625 in. (i5.8623/15.8750 mm.)
30 x 62 x 16 mrir.
.625x1.5625x.4375 in. (15.875 x
39.2875x11.1125 mm.)
.74851.749 in. ('19.0119119.0246 mm.)
.62451.625 in. (15.8623/15.8750 mm.)
.7521:79 in. (19.1008/19.,1262 mm.)'
'1.17911.180 ii. (29-9466129.9720 m;n.)
'6882/.6885 in. (17.4803117.4879 mm.)
TRANSMISSION
CLUTCH
TyP"
Number of plates:
Multi-plate with integral cush drive
Driving (bonded segments)
Driven (plain)
Overall thickness of driving plate and segments
4
Clutch springs
Free length of springs
Clutch push rod (length)
Clutch push rod (diameter)
4
5
.167
in. (4.242 mm.\
1.65685
in. (42.0687
mm.1
9.0 in. (228.6 mm.)
.1875 in. (4.7025 mm.)
GEAR RATIOS
Gearbox-top
-th
1.0
1.24
1.65
2.65
ird
-second
-first
Overall-top
-th
6.89
8.54
11.37
18-26
ird
-second
rst
-fi
SPR()CKETS
Engi ne
23
52
1 7
52
Clutch
Gearbox
Rear wheel...
teeth
teeth
teeth
teeth
GD3
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GD
CI.IAIN
GENERAL DATA
SIZES
Duplex '375 in. x70 links
0.625 in.x108 links
Primary
Transmission
FRAME
FRONT FORKS
Type
Siiings-free
length ...
-Compressed
length
-fitted
...
Iength
rate
-Springlead
-Max. identification
-colour
diameter top ...
Stanchion
...
Stanchion diameter bottom
Stanchion internal bore ...
Outer member bore size
REAR DAMPERS
...
...
AND FITTINGS
Coil-spring (hydraulically damped)
19'1 in. (48'5 mm.)
11.4 in. (289.5 mm,)
18.5 in. (217 mm.)
25 lb/in.
194 lbs. (45.5 l."
Fig F7. Wheel bearing
lr.l
|
-uoo
drift
lf a drift of the correct dimensions is not used then
the spacer tube will be damaged and have to be
replaced.
The bearing is an interference fit on the spacer tube
and should be removed using the same drift as
before. The spacer tube and drift can now be used
to knock the remaining bearing out of the hub.
Remove the bearing from the spacer tube.
The grease retainers behind the bearings should
not require attention. But if replacement is necessary knocl< them out using a drift from inside the
hub.
Replace the bearing onto the spacer tube and place
the assembly into the hub from the left side. Drift
the bearing into the housing and down onto the
grease retainer with a suitable diameter drift.
Force must be applied to the outer ring of the
bearing and not the inner ring. lf possible use a hand
press for replacing these bearings.
the retaining ring and tighten using tool
No. 61-3694. Replace the remaining bearing from
the right side.
Replace
Reassembly of
the hub is simply the reverse of the
dismantling procedure but, when pressing the
To examine the bearings, wash thoroughly in paraffin and if possible, blow out with a high pressure air
line. Examine each bearing carefully for signs of
oearings in, apply pressure only to the outside ring
bearing and ensure that the retainer on the
left-hand side is quite tight.
ofthe
F6
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WHEELS, BRAKES AND TYRES
Fig.
F.9. Exploded view of rear wheel
SECTION
F
assembly
F8
BRAKE ADJ USTMENT
The brakes must be adjusted to give maximum
efficiency at all times and for this to be maintained,
the shoes should be iust clear ofthe drum when the
brake is off, and close enough for immediate contact
when the brake is applied. The brakes must not be
adjusted so closely, however, that they are in
continual contact with the drum; excessive heat
may be generated, resulting in deterioration of
braking efticiency.
On twin leadlng shoe brakes the expansion of the
shoes is equalised by the caliper action of the cam
levers. The cable adjuster is combined with the
control lever on the handlebar and should be set
to eliminate slackness without applying the brakes.
After considerable mileage it may be necessary to
re-position the shoes within the brake drum.
lndividual adjustment of the shoes is provided by
a
screw at the actuating taPPet of each screw. Slacken
until it cannot be turned any further. At this point
the shoes will be fully expanded against the drum.
Now unscrew the adjustor until the wheel is free to
rotate and the shoe is just clear of the drum. Turn
the wheel through half a revolution and rePeat the
adjustment on the remaining shoe. Check that the
wheel revolves freely. Now adiust the clearance in
the cable at the adjuster on the control lever. Turn
the knurled nut until there is aPProximately Sin.
to {in. slack in the cable at the lever.
On sJngle leading shoe front brakes the adjustment
is taken up at the handlebar lever as for the twin
leading shoe brake. Note: The brakes are not
adjustable within the drum on this brake. When the
range ofadiustment has been reduced at the handlebar lever drive to where the cable can be adjusted
by means of an integral ad.iuster situated ,iust below
the stop light switch.
off the cable adjuster at the handlebar lever and
remove the rubber Srommet from the hub shell.
Rotate the wheel until the aPerture is opposite to
the adjuster screw. The adluster turns with a series
The rear bralce is adjusted by turning the self-
of clicks and must be rotated in a clocl--4
"""k,,f" 1la/_'
I
ig
il
ll
I
'>4,
a-1
G7. Benclr testing the rectifier
>--1 1<):I:'
'-r{a
/
,
\/l
Yl,
, __,)tl i"'.r-o
-;f.
?);i.l,{.
ls
Fig. G8. Rectifier test sequence
->{"^ >:Y
/ -r
,^it
'>*-
4
^\r*
t42
G11
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ELECTRICAL SYSTEM
ln Fig. G8, the re*ifier terminal marl
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Gl3. Wiring diagram
G17
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sEcTroN
J
SERVICE TOOLS
INTRODUCTION
This section of the Workshop Manual illustrates pictorially the workshop service tools that
are available for carrying out the major dismantling and reassembly operations on the
UNIT CONSTRUCTION-250 c.c. TRIUMPH MOTORCYCLE.
J1
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SERVICE TOOLS
Fig. Jl.
Valve seat cutter No. D1832
Blender cutter No. D1835
Arbor, pilot assembly No. D|853
Fig. t2.
Fig. J3.
Piston ring slipper
No.6l-5031 (65-70 mm.)
Valve guide removal and
replacement
JZ
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tool. No, 6l-6063
SERVICE TOOLS
J
Flg. t4.
Contact breaker cam removal tool
No.6l-3816
Fig. J5.
Clutch sleeve extra€tor No. 61-3583
Fig. J5. T.D.C.
locating plunger and bodY
Nos. D2195/D572
Fig. J7.
Ctutch locking tool No. 6l-3774
J3
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SERVICE TOOLS
T
@
@
@
@
t
@
@
@
@
ff fl
Fig.
fl
25W75
Jl0. Contact breaker oil
No.
seal spreader
2168
W
Fig. J8. Pinion extractor set
No. 51-3808
At44
Jll. Crank protection cap No.61-3819
(For use with extractor No. 61-3808)
Fig.
25W76
Fig. J9. Crankshaft balance weight
No.61-3809
J4
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SERVICE TOOLS
Fig. J12. Crankcase Parting
tool No.
Fig. J13. Crankcase assembly
2155
tool No. Zl57
J5
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SERVICE TOOLS
J
Fig.
tl4.
Wheel bearing retainer peg spanner
No. 5l-3694
Fig. Jl5.
Head race bearing
Fig. t17
Crankshaft bearing removal tool No.
D3677
drift No. 6l-5113
Fig. Jl6.
Fork damper valve removing tool No.
J6
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61-6121
CONVERSION
TABLES
cT1
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CT
CONVERSION TABLES
INCHES TO MILLIMETERS-UNITS
lnches
0
0
10
20
30
40
254.0
508.0
762.0
1016.0
1
25.4
279.4
533.4
787.4
1041.4
2
50.8
304.8
558.8
812.8
1066.8
3
76.2
330.2
584.2
838.2
1092.2
4
101 .6
355'6
609'6
863.6
1117.6
5
127-O
38'1.0
635.0
889.0
1143.0
6
152.4
406.4
660.4
914.4
1168.4
7
177.8
431.8
685.8
939.8
1193.8
I
203.2
457.2
711.2
965-2
1219.2
9
228.6
482.6
736.6
990.6
1244.6
One lnch-25.399978 millimetres
One Metre-39.37011 3 inches
One Mile-1.6093 Km
One Km-.62138 miles
DECI MALS
1
i
/1
TO
M
I
LLI M ETRES-FRACTIO N S
000
1t10
11100
L
rrnches I mm
nches
mm.
.001
.0254
.01
.254
.1
2.54
.002
.0508
.02
.508
-2
5.08
.003
.0762
.03
.726
.3
7.62
.004
-1016
.o4
.016
1
.4
14.16
.005
1270
.05
1.270
'5
12.70
.006
.'t524
.06
1.524
-6
15.24
.007
.1778
.07
1.778
.7
17.78
.008
.2032
'08
2.032
.8
20.32
'009
.2286
09
2.286
.9
22.86
i
n
ches
mm.
CT7
www.bsaunitsingles.com
CT
CONVERSION TABLES
FRACTIONS TO DECIMALS AND MILLIMETR,ES
F
Decimals
ractions
1164
1132
3164
-3969
.031 25
-7937
.04687s
.0625
1116
5t64
.078125
'0937s
3132
7164
.'t09375
-125
1t8
9
t64
444625
-15625
s l32
11 164
171875
.1875
3116
13164
7132
15t64
114
17 164
't9164
s116
21 164
1.5875
5.9531
.25
6.3500
265625
3125
7.9375
.34375
11132
23164
2s
164
27164
421875
.4375
7116
29164
.453125
.46875
1s132
31 164
484375
.5
4s164
17.8594
'71875
18.2562
47
.734375
'18'653'l
.75
1
.765625
19.4469
.7g'.t25
19.8437
sl164
.79687s
20.2406
'8125
24"6375
s3164
.828125
21.0344
.84375
21.4312
.859375
21.8281
.875
22.2250
.890625
22.6219
.90625
23.O187
s9164
.921875
23.4156
'9375
23.8125
61 164
.9531 25
24.2094
.96875
24.6062
.984375
25.0031
164
49164
25132
13116
27 32
ssl64
718
s7
164
29132
10.7156
1s116
11.5094
11.9062
1
17.4625
.703125
314
10'31 87
11.',!125
17.06s6
.6875
23132
9.9219
390625
40625
13132
9.5250
16.6687
.671875
1',t 116
9.1281
.375
3/8
16.2719
.65685
164
43 t64
8.7312
.359375
1
-640625
21!32
8.3344
328125
15.478'l
.625
41
7.1437
7-5406
15.0812
-60937s
s/8
6.7469
296875
14.6844
.59375
39164
4.3656
.234375
14.287s
-57812s
19132
3.9687
5.5562
1
.5625
37164
3.5719
.21875
13.4937
.546675
e 116
2.7781
5.1594
.531 25
35t64
2.3812
4.7625
'13.0969
17132
1.9844
3.'1750
mm.
.5'15625
33164
1-1906
.203125
28125
e 132
't 12
.01 5625
Decimals
Fracti ons
mm.
2.3031
12.7000
31132
63164
3.8906
5.8750
9.0500
25.4000
cT3
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CT
CONVERSION TABLES
MILLI MFTRES
mm.
0
0
10
/1
20
30
40
.3937C
.78740
1.181't0
1.57480
1
.03937
.43307
'82677
1-22047
1.61417
2
.07874
.47244
.86614
1.25984
1'65354
3
11811
'511 81
.90551
1.29921,
't-69291
4
15748
'551
I
.94488
1.33858
1.73228
5
'1968s
.59055
.98425
1.37795
1-77165
6
.23622
.62992
1.02362
1.41732
1
7
.27559
.669?-9
1.06299
1.45669
1'85040
8
'31496
.70866
I .10236
1.49606
1.88977
9
.35433
.74803
1.14173
1.53543
1.92914
mm.
50
60
70
80
90
0
1.96851
2.36221
2.75591
3.14961
3.5433'l
1
2.00788
2.40158
2.79528
3.1 8891
3.58268
2
2.04725
2.44495
2.83465
3.22835
3.62205
3
2.08662
2.48032
2.87402
3.26772
3-66142
4
2.'.t2599
2-51969
2.91339
3'30709
3.70079
5
2-16s36
2.55906
2.95276
3.34646
3.74A16
6
2.20473
2.59843
2 99213
3.38s83
3.77953
7
2.24414
2.63780
3.031 s0
3.42520
3'81 890
I
2.28347
2.67717
3.07087
3.46457
3.85827
9
2.32284
2.71654
3.11024
3'50394
3.89764
MILLIMETRES
1
TO INCI.{ES-UNITS
1
.81103
TO INCHES-FRACTIONS
I
000
1110
1100
mm.
inches
mm.
i
nch es
mm,
0.001
.000039
0.01
.00039
0.1
00394
0'002
.000079
0.02
'00079
0.2
.oo787
0.003
.0001
8
0.03
'001 18
0.3
.o1't81
0.004
.0001 57
0'04
.00't 57
0.4
.01575
0.005
.000197
0.0s
.00197
0.5
.01969
0.006
'000236
0.06
.00236
0.6
-02362
0.007
.000276
0.07
.04276
0'7
.02756
0'008
.00031 5
0.08
.00315
0.8
.031 50
0.009
.000354
0.09
.003s4
0.9
.03543
1
CT4
www.bsaunitsingles.com
i
n
ches
CT
CONVERSION TABLES
DRILL SIZES
Lette r
Size
Letter
Number
Size
Size
Size
N u rnber
Number
Size
Number
Size
'2280
14
.1820
27
.1440
40
.0980
2
.7210
15
.1800
28
.1405
41
'0960
.323
3
.2130
16
.1770
29
.1
360
42
.0935
o
'332
4
.2090
17
1730
30
285
43
.0890
"1
.250
.339
5
.2055
18
.1695
31
1
200
44
.0860
R
F
.257
c
.348
6
.2040
19
.1660
)z
1160
45
0820
G
.261
T
'358
7
.2010
20
.1610
33
.11 30
46
.081 0
.266
U
.368
8
.1990
21
'1
s90
34
1110
47
.0785
FI
.277
.377
9
.1960
22
1570
35
1
100
48
.0760
I
'277
.386
10
.1935
23
1540
36
'r
06s
49
.0730
K
.281
X
'397
11
1910
24
1
520
37
'1040
50
'0700
L
.290
Y
.404
12
1
890
?q
.1495
38
.101 5
51
A
.234
N
.302
1
B
.238
o
.316
c
.v42
P
D
-246
E
M
295
z
.413
13
.1850
1470
26
'0995
39
52
'0670
.0635
WIRE GAUGES
Brow,n and Sharpe's
American Wire Gauge
millimetres
0000
000
00
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
'18
19
20
21
22
23
24
25
26
27
28
29
30
.400
.372
.348
.324
.300
.276
.252
.232
.212
.'t92
.176
'160
.144
.128
.116
.104
.092
.080
.072
.064
.056
.048
.040
.036
.032
.028
.024
.022
.020
.018
.0164
.0148
.01 36
.0't24
10.160
9.448
8 839
8.299
7.620
7.010
6.400
5.892
5.384
4.676
4.470
4.064
3.657
3.251
2.946
2.641
2.336
2.032
1.828
1.625
't.422
1.219
1.016
.9',t4
.812
.7'11
.609
'558
.508
.457
-416
.460
.410
.365
.325
.289
'258
-229
.204
.187
.162
.144
.128
.114
.102
.091
.081
.072
.064
.457
.051
.045
'040
.035
.032
.028
.025
.023
'020
'018
11.684
10-404
9.265
8.251
7.348
6-543
5.827
5.189
4.621
4.115
3.664
3.263
2.906
2.588
2.304
2.052
1.827
1.627
1.449
1.290
1.149
1.009
.911
.811
.722
.643
.573
.511
.0'16
.454
.404
014
.360
.375
.012
.321
.345
'011
.285
.314
.010
.254
CT5
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CT
CONVERSION TABLES
B.S.W. SCREW THREADS
Dia. of
Th reads
bolt
Per
(i n
ch)
Dia. tap
rill
d
Core
Area at
dia.
thd. root
(inch)
in ch
PITCH
Nut
sq. in.
max.
AMETER
HEX.
Flats
Bolt
lmin.
i,oo
114
20
.1968
.1860
.0272
.224s
s
18
114
.2417
.0458
.2836
3/8
16
s116
.2950
.0683
.3420
3370
7116
't4
23t64
.3460
.0940
.3991
112
12
13132
3933
.1215
e 116
12
1s
.4558
s/8
11
17132
11l't6
11
314
max.
lmin.
I
(mean)
Corners
|
Nut
th i ckn ess
(.00s)
-522
'6'l
-245
.2722
'597
.69
.307
'3350
3300
-707
.82
.370
.3938
.39't 8
.3865
.817
.95
-432
.4544
.4486
.4466
.4408
.917
1.06
.49s
.1632
.5169
.5111
.5091
.5033
1.006
1.'.t7
'557
.5086
.2032
.s748
.5688
.5668
.5608
1.096
't-27
.620
37 164
.5711
-2562
.631 3
-6293
'1196
1.39
.682
't0
41164
.6219
.3038
'6880
'6860
.6797
1.296
1.50
.745
13116
10
4s 164
.6844
.3679
7506
.7485
718
9
314
'7327
.4216
.8059
.8039
.7972
1.474
1.71
.870
'ts l16
9
13 t16
'7952
.4966
.8684
.8664
1
I
ss 164
.8399
.s540
-9220
.9200
.9129
1.664
'1.93
.995
116
132
'6943
.8126
.9291
-2789
.2769
B.S.F. SCREW THREADS
Dia. of
Th reads
bolt
Dia. tap
d
rill
Core
Area at
dia.
thd. root
Per
nch
(i n
7132
28
.1770
114
26
.2055
el32
26
.238
s116
22
-261
3/8
20
316
.31't 0
7116
18
3/8
.3664
112
16
27 164
.4200
e 116
16
.492
-4425
s/8
14
3s164
.5335
11116
14
39164
.s960
314
12
21132
.6433
13116
12
23 t32
.70s8
718
11
25t32
(inch)
i
10
ch)
sq. in.
PITCH DIAMETER
Nut
Bolt
I
max. lmin. Iru*. 1min.
.1731
.0235
.2018
2007
.0316
-2313
2320
.0423
2543
HEX.
Corners
Flats
(mean)
Nut
th i ckness
(mean)
|
'1980
.1960
.1922
412
.48
166
.2274
.2254
.2215
-442
.51
195
.2625
.0586
.2565
-2527
.0508
.2897
.2854
.2834
.2791
.522
'6',1
-245
0760
.3495
'3450
.3430
.3385
.597
.69
-307
'1054
.4086
.4039
.4019
.3372
'707
'82
.370
'1385
'4670
'4620
.4600
.4550
.817
.95
.432
828
.5295
.5245
.5225
.5175
.9'.17
'1.06
.495
2235
5866
.s81 3
'5793
-5744
1.006
1.17
.557
2790
-6491
.6438
.6418
.6365
1.096
1.27
.620
'3250
.7044
.6986
.6966
.6908
1.196
1.39
682
391 3
7669
.7611
.7s91
'7533
7586
.4520
.8248
.8188
.8168
.8108
1.296
1.50
.745
57 64
.87',t9
.5971
.9443
'9380
.9360
.9297
1.474
1.71
.870
1
.9827
.7585
1.0626
1.0559
1.0539
1.0472
1.664
1.98
.995
.9637
1.'1876
1 .1809
1.7819
1|t722
1.852
2.15
1
"1
1-118
9
1
114
9
1-118
1.1077
1
-3/8
I
1-15164
1-2149
'1593
1.3041
1.2970
1.2950
1.2879
2-042
2.37
1.240
1-112
8
1'358
1.3399
.4100
1.4291
1.4220
1-4200
1.4129
2.2'10
2.56
1.365
-s/8
8
1-31164
1.4649
1.6854
1.5541
1-5470
1'54s0
1.5379
2-400
2.78
1.400
1
cT6
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115
CT
CONVERSION TABLES
B.S.C. SCREW THREADS
BASIC DIAMETERS (lnch)
THDS, PER INCH
Dia. of
Normal
bolt
(i
series
40
nch)
18
20 T.P.l.
series
Depth of
ch)
0.02500
th read
(i n ch)
0.0133
Pitch
(i n
Effective
Minor
250
0.1117
0'0984
Major
.01
s l32
32
0.03125
0.0166
0.1 563
0.1397
0.1231
3116
32
0.031 2s
0.0166
0.1875
0.1709
0.'t543
7132
26
0.03846
0.0205
0.2'188
0.1983
0.1778
114
26
0.03846
0.0205
0.2500
0.2295
0.2090
e l32
26
0.03846
0.0205
0.2813
0.2608
o.2403
s
26
0.03846
0.0205
0'3125
0.2920
0.27't5
26
0.03846
0.0205
0.3750
0.3s45
0.3340
0.03846
0.0205
0.4375
o.4't70
0.3965
0.05000
0.0266
0.4375
o.4109
0.3843
0.03846
0.0205
0.5000
o.4795
0.4s90
0.05000
0.0266
0.s000
0.4734
0-4468
0.03846
0.0205
0.562s
0.5420
0'521 5
0.05000
0.0266
0'5625
0's359
0.5093
0.03846
0.020s
0.6250
0.6045
0.5840
0.05000
0.0266
0'6250
0.5984
0's718
0.03846
0.0205
0.6875
0'6670
o.6465
0'05000
0'0266
0.6875
0.6609
0.6343
0.03846
0.0205
0.7500
0.7295
0.7090
0'05000
0.0266
0.7s00
0.7234
0.6968
116
3/8
7t16
j
26
1i2
I
26
et16
si8
20
r
26
t
(
20
26
20
1
(
11116
20
1
26
<
t
314
(
1
20
26
20
cT7
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CT
CONVERSION TABLES
B.A. SCREW THR,EADS
Dia. of
Area at
Thds.
Dia. tap
bolt
per inch
0
.2362
25.4
.1960
1
.2087
28.2
.1770
2
.1850
31.4
3
1614
34.8
4
,1417
38.5
5
.1260
6
No.
d
rill
1520
.'1
Core
thd. root
PITCH
Nut
D AMETER
sq. in.
max. I
.1890
.0281
.2165
.2126
2't26
.166'l
.0217
.'1908
.1875
.1873
1468
.0'169
1693
'1659
.1659
.0126
d
ia.
HEX.
Bolt
m
in.
max. lmin.
Flats lCorners
Nut
thickness
.2087
.413
.47
'236
838
.365
43
.209
-1626
.324
.37
185
1441
.1409
-282
.33
161
1261
.'t231
248
.29
-142
11't9
.1091
224
.25
.126
1
360
1269
1160
fl46
'0096
1290
1261
43.0
1440
.0981
.0075
1147
.1119
1102
47.9
.0935
'0852
'0057
.1000
'0976
'0976
'0953
19?
.22
110
7
0984
52.9
.0810
'0738
.0045
'0893
.0869
.0869
.0845
'172
.20
.098
8
.0866
59.1
.0730
.0663
.0034
'0785
'0764
.0764
-0742
.152
18
.087
9
.0748
65.1
.0635
.0564
.0025
.0675
'0656
.0656
.0636
.131
15
'07s
10
.o669
72.6
.0550
.0504
-0021
.0587
.0587
117
14
'067
11
.0591
81.9
.0465
.0445
.00't6
.103
12
.051'l
90.9
.0400
.0378
.0011
.090
'10
.051
13
.0472
102.0
.0360
.0352
.0010
'083
.09
.o47
14
.0394
109.9
'0292
'0280
.0006
'069
.08
.o29
15
.0354
120.s
.0260
.0250
'0005
.061
-07
.035
16
.0311
1
33.3
.0225
.0220
.0004
1472
1441
cT8
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"t2
.059
CT
CONVERSION TABLES
FOOT POUNDS TO KILOGRAMETRES
0
o.277
1.659
0.'1 38
10
20
30
40
50
60
70
1-114
1.383
2.765
2.903
4.148
4.286
3.042
4.424
5.530
6.913
8'295
5.668
7.051
5.807
7.189
8.434
9'816
8.572
9.678
80
11.060
90
'12.443
9.954
11.337
12.719
11.199
12.581
5
0.4'ts
0.553
0.691
0.830
1.797
3.180
1.936
2.074
2.212
3'318
3.456
4.839
6.221
3.595
4.977
6.360
7.742
9.125
1 0.507
'11.890
13.272
4.562
4-701
5.945
6.083
7.466
8.848
7.328
8.710
10.093
11.475
12.858
M!LES
1
0
1
70
80
16.093
32'187
48.280
64.374
80.467
96.561
112.6s4
128.748
90
'144.841
1'609
17.703
33.796
49.890
65.983
82.077
98.170
114.264
't 30.357
146.451
10
20
30
40
50
60
10.231
8.987
1 0.369
11.6'.13
11.752
12.996
13.134
TO
4.828
20.922
3.719
35.406
51.499
67.593
83.686
99.780
53.108
69.202
85.295
10't .389
'115.873
117.482
131.967
148'060
'1
37.01 5
33.576
149.669
9
7.881
9.263
10.646
12.028
13.411
1.106
2.489
3'871
5.254
6'636
8.019
9.401
10.784
12.166
1 3.549
7
8
0.968
2.350
3'733
s.1't6
6.498
1.244
2.627
4.009
5.392
6.774
8.1 57
9.540
10.922
2.305
13.687
1
1o
20
30
40
50
60
70
80
90
KILOMETRES
4
3
't9.312
7.604
I
7
6
4
3
2
1
6
5
6.437
22.531
38-624
54.718
70.811
86.905
102.998
119.092
1 35.185
151.279
8.047
24-140
4A.234
56.327
72.421
88.51 4
04.608
110.701
136.79s
1 52'888
1
9.656
25.750
41.843
57.936
74.030
90.123
106.217
122.310
138.404
154.497
11.265
27.359
43.452
59.546
75.639
91-733
107.826
123'920
140.013
156.107
9
12.875
14'484
28.968
30.578
10
45-462
61.155
77.249
46.671
20
157.7'16
62.765
78'858
94.951
't11.045
127.138
143.232
159.325
8
9
93.342
109.436
125.529
141.623
30
40
50
60
70
80
90
POUNDS TO KILOGRAMS
0
10
4-536
20
30
9.072
o.454
4.994
9'525
'13.608
40
18.144
50
60
22.680
14.061
18.597
23.133
27.669
32.205
27.216
31.751
36.287
40.823
70
80
90
36.741
41.277
MTLES PER
10 28.20
10+ 26.9s
11 25.68
11+ 24.s6
12 23.54
12+ 22.60
't 3 21.73
13+ 20.92
14 20.18
14+
19.48
5 18.83
1e.22
16 17.66
16+ 17.12
17 16.61
17+ 16.14
18 15.69
18+ 1s.27
19 14.87
1
1s+
19+ 14.49
7
6
5
L
3
4
0.907
5.443
9.079
14.515
19'051
23.s87
28.123
32.659
37.195
41.731
1.361
5.897
10.433
1.814
2.268
2'722
3.175
6.350
't 0.886
7.257
7.711
1'.t.793
14'968
15.422
19.504
'19.958
24.040
24.494
29.030
33'566
38'102
42.638
6.8A4
11.340
15.876
24.412
24.948
29.484
34'019
38.855
12.247
16.783
21.319
25.8ss
1
28.576
33.112
37.648
42'184
43.091
16.329
20.865
25.401
29.937
34.473
39.009
43.545
GALLON (!MPERIAI-) TO LITRES
20
20+
2'.t
21+
22
22+
23
23+
24
24+
14.12
13.78
13.45
13.14
12.84
12.ss
12.28
12.02
11.77
11.53
25 11 .30
2s+ f.a8
26 10.87
26+ 10.66
27 10.46
27+ 14.27
28 10.09
28+ e.e1
29 9.74
29+
9.s8
o.L)
35
9.26
3s+
31
9.11
36
31+
36+
33*
8.97
8.83
8.69
8'56
8.43
34
8.31
38
38+
39
34+
8.19
3e+
30
30+
32
32+
33
37
37+
8.07
7.96
7.85
7.74
7.63
7.53
7.43
7.34
7.24
7-15
40
41
42
43
44
45
46
47
48
49
3.629
8'165
12.741
17.237
21.772
26.308
30.844
35.380
39-916
30.391
34.927
39.463
43.998
44.452
4.082
8.618
13.1s4
17-690
22.226
26.762
31.298
35.834
40.370
44-906
1o
20
30
40
50
60
70
80
90
PER, 100 KILoMETRES
7.06
6 89
6.73
6.57
6.42
I s0
I sl
I s2
I s3
s4
6'28 I ss
6.14 I 56
6.01 | s7
s'8e I s8
5.77 I s9
|
5.65
60
s.s4
s'43
61
s.33
5'23
s.13
s.04
4.96
4.87
4.79
63
62
64
65
66
67
68
69
4.71 I 70
4.63 I 71
4'55 I 72
4.48 I 73
4.41 I 74
4.3s I
4.28 I 76
4.22 I 77
4.16 178
4'10 I 79
7s
4.04
3.98
3.92
3.87
3.82
3.77
3'72
3.67
362
3.57
cT9
www.bsaunitsingles.com
CT
CONVERSION TABLES
PINTS TO LITRES
0
1
.568
.710
14'
I
.284
.426
..t-
2
3
.8s2
.994
2
3
4
5
6
7
8
1.'t36
1.279
1.420
1.563
1.705
1.846
2.273
2.841
2.983
3.841
3.552
3.978
4.12A
3'125
3.'t2s
4.546
4.688
4'830
3.267
3.836
1.989
2.131
2.4't5
2-557
2.699
GALLONS (tMPER|AL) TO
o
1
4.546
40
45.46A
90-919
136.379
1 81 .838
50
227.298
60
70
80
272'757
318.217
363.676
409-136
10
20
30
90
2
9.092
50'005
9s.465
54.551
100.01 1
140.924
145.470
1 90.930
236.389
281.849
327.308
372.768
418.227
186.384
231.843
277.303
322.762
368.222
413.681
3
4
13.638
59.097
104.557
150.016
195.476
240-935
18.'184
63.643
000'000
000.000
200.022
204.568
245.481
290'941
336'400
381.860
427.319
250.027
295.487
340.946
386.406
431.86s
286.39s
331.854
377.314
422.773
5
4.6F4
4.404
'4.972
LTTRES
6
22.730
27.276
63.1 89
72.73s
113.649
1 59.108
118.195
163.645
209-114
254.573
300'033
345.492
390.952
436.411
7
31.822
77.28'l
122.741
1 68.200
713.660
259.119
304.579
3s0.038
395.498
440.957
I
36.368
81.827
127.287
172.746
218'206
263.605
309.1 25
354.s84
400.044
44s.503
9
40.9't4
86.373
13'1 '833
1o
20
177.292
30
222-752
268.211
40
313.671
359.'t 30
60
70
404.590
450.049
80
90
50
POUNDS PER S@L'ARE INCH TO
KILOGRAMS PER SAUARE CENTIMETRE
0
1
2
3
4
5
6
7
8
9
0-141
c.211
0.703
0.492
0.914
0.352
't.055
0.422
0.844
0.28'l
0.984
1-547
1.687
2.390
3.093
3.797
4.500
5.203
5.906
6.649
'1.7s8
1.125
1.828
2.46',1
2-531
3.164
3.867
3-234
3.937
1.195
1.898
2.601
3.304
4.007
0.562
1.266
1-617
4.078
4.570
4.640
4.711
4-781
5.273
5-976
6.679
s.343
6.046
5.414
6.117
5.820
5.484
6.187
6'890
0.633
1.336
2.039
2.742
3.445
4.',t48
4.85'l
5.554
6.257
50
60
70
80
6.960
90
10
20
1.406
0.070
0-773
1-476
30
2.109
2'179
2.250
2.320
40
2.812
50
60
2.883
3.586
3.023
3.726
4.218
4.92',1
4'289
4.992
2.9s3
3.656
4-359
5.062
4'429
5.132
5.624
6'328
5.695
6.398
5.76s
6.468
5.835
6.538
70
80
90
cT10
3.515
6.749
1.969
2.672
3.375
10
20
30
40
Printed in England by
Warwick Printing Co. Ltd.,lWarwick
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