Product Detail Manual
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GENERAL ENGINEERING CATALOG – NO. 17
A PART OF
Unistrut is the original metal framing system featuring a unique
weldless connection. The Unistrut system eliminates welding
and drilling, and is easily adjustable and reusable for infinite
configurations. Over time, our brand has evolved from a simple
connection concept to a comprehensive engineered building
and support system featuring a robust line of channels, fittings,
fasteners, hangers, pipe clamps, and accessories. Backed by our
worldwide network of engineering and distribution centers, we
provide customers with total-resource capability, making Unistrut
the brand everyone asks for by name.
The Unistrut World of Support
starts with our network of Unistrut
Service Centers across the nation.
T
he Unistrut World of Support starts with our network of Unistrut
Service Centers across North America. They go far beyond providing
local product inventories... by offering complete application solutions,
based on experience gained from thousands of projects worldwide.
It’s the kind of knowledgeable assistance that can help save time and
cost now, and simplify change in the future.
Technical help? No one knows the engineering side of Unistrut support
systems like your local Unistrut team. And if it’s special fabrication, cutting
or custom finishing you want, the pros at your local Unistrut Service
Center will make it happen...quickly, efficiently, economically.
So when it’s help you need, call your Unistrut Service Center—
the quickest way to unlock Unistrut’s World of Support.
TABLE OF CONTENTS
INTRODUCTION . . . . . . . . . . . . . . . . . . 2-20
Unistrut Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Table of Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Unistrut Metal Framing Systems . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Quality Assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Materials and Finishes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 - 13
Design Fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 - 15
Conversion Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Reference Tables and Data . . . . . . . . . . . . . . . . . . . . . . . . . 17 - 18
Guide Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
New Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
15»8" CHANNEL . . . . . . . . . . . . . . . . . . 21-62
Channel Selection Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
P1000 (12 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 - 29
P1100 (14 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 - 32
P2000 (16 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 - 35
P3000 (12 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 - 38
P3300 (12 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 - 41
P4000 (16 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 - 44
P4100 (14 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 - 47
P4400 (12 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 - 50
P4520 (12 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 - 53
P5000 (12 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 - 56
P5500 (12 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 - 59
Closure Strips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
End Caps and Frame Caps . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Lateral Bracing Load Reduction Chart & Bearing Loads . . . . . . .62
TELESTRUT® SYSTEM . . . . . . . . . . . . 63-70
Telescoping Tube. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 - 67
Connection Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Specialized Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Post Bases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 - 69
Cutting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
NUTS & HARDWARE . . . . . . . . . . . . . 71-76
Channel Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 - 73
Top Retainer Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Stud Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 - 76
Threaded Rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
GENERAL FITTINGS . . . . . . . . . . . . . 77-106
Flat Plate Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 - 82
Ninety Degree Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 - 85
Angular Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
“Z” Shape Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
“U” Shape Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 - 88
Wing Shape Fittings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 - 90
Post Bases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Brackets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 - 93
Brace Fittings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Beam Clamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 - 101
Trolleys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
Special Application Fittings . . . . . . . . . . . . . . . . . . . . . . . 103 - 104
Seismic Retrofit Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . 104 - 106
PIPE/CONDUIT SUPPORTS. . . . . . . 107-126
Pipe/Conduit Clamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 - 111
Unicushion® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112
Pipe & Tubing (Cush-A-Clamp®) Clamps. . . . . . . . . . . . . 113 - 116
Pipe Hangers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .117
Pipe Rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 - 119
Pipe Brackets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
Reference Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 - 126
ELECTRICAL FITTINGS . . . . . . . . . . 127-138
Electrical Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 - 130
Receptacles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131
Fixture Hangers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131
Accessories and Connectors . . . . . . . . . . . . . . . . . . . . . . . . . .132
Junction Boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
In-Channel Joiners. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
Swivel Hangers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
Cable Entrance Tubing and Accessories . . . . . . . . . . . . . 134 - 136
Electrical Fittings Technical Data . . . . . . . . . . . . . . . . . . . 137 - 138
CONCRETE INSERTS. . . . . . . . . . . . 139-146
Heavy-Duty Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141
Standard-Duty Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . .142, 144
Light-Duty Inserts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .143
Spot Inserts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144
Deck Inserts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
SOLAR COMPONENTS. . . . . . . . . . 147-150
Application Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .148
Solar Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
Key Advantages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150
UNIPIER® . . . . . . . . . . . . . . . . . . . . 151-168
Sleeper Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 - 154
Strut Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155 - 158
Conduit Supports
Mounted Support, Polycarbonate Base . . . . . . . . . . . . . . . . . . .157
Elevated Support, Polycarbonate Base . . . . . . . . . . . . . . . . . . .157
Elevated Support, Steel Base . . . . . . . . . . . . . . . . . . . . . . . . . .158
Gas and Mechanical Supports
Mounted Support, Polycarbonate Base . . . . . . . . . . . . . . . . . . .158
Mounted Support, w/Roller Polycarbonate Base . . . . . . . . . . . .158
Elevated Support, w/Roller, Polycarbonate Base . . . . . . . . . . .159
Elevated Support, w/Roller, Steel Base . . . . . . . . . . . . . . . . . . .160
Accessories
Spacer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .160
Support Pads, Deck Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . .160
Pipe Hanger Bases, Polycarbonate and Steel. . . . . . . . . . . . . .161
Fabricated Supports
Single Base Trapeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162
Double Base Trapeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163
Heavy Duty Double Base Trapeze. . . . . . . . . . . . . . . . . . . . . . .163
Double Base Duct Support . . . . . . . . . . . . . . . . . . . . . . . . . . . .163
Mechanical Supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .164
Bridge Cross-Over, Walkway, Service Platform or Ramp . . . . .164
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165
Pipe Diameters and Loading . . . . . . . . . . . . . . . . . . . . . . . . . . .166
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .167 – 168
11»4" FRAMING SYSTEM . . . . . . . . . 169-180
A1000 (14 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 - 172
A3300 (14 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 - 174
A4000 (19 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 - 176
A5000 (14 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177
Channel Nuts and Closure Strips . . . . . . . . . . . . . . . . . . . . . . .178
Flat Plate Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 - 179
Ninety Degree Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . 179 - 180
Angle and Wing Shape Fittings . . . . . . . . . . . . . . . . . . . . . . . . .179
“U” Shape Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180
Pipe / Tubing Clips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180
Brackets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180
13
»16" FRAMING SYSTEM . . . . . . . . 181-190
P6000 (19 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 - 184
P7000 (19 Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185 - 186
Channel Nuts, End Caps, and Closure Strips . . . . . . . . . . . . . .187
Flat Plate Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187 - 188
Ninety Degree Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .188
Angular Fittings, Wing Shape Fittings . . . . . . . . . . . . . . . 189 - 190
“Z” Shape Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189
“U” Shape Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189 - 190
Special Application Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
Beam Clamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
Tubing Clips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
FIBERGLASS SYSTEM. . . . . . . . . . . 191-206
Heavy Duty Channel (Flange Profile) . . . . . . . . . . . . . . . . . . . .193
Light Duty Channel (Flange Profile). . . . . . . . . . . . . . . . . . . . . .194
Heavy Duty Channel (SST Profile) . . . . . . . . . . . . . . . . . . . . . .195
Nuts & Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 - 198
Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199 - 200
Pipe Clamps and Straps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .201
Clevis Hangers and Channel Inserts . . . . . . . . . . . . . . . . . . . . .202
Beam Clamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203
Power Rack Stanchions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203
Chemical Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . 204 - 205
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206
SPECIAL METALS . . . . . . . . . . . . . . 207-212
Stainless Steel Channel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .209
Stainless Steel Nuts and Closure Strips . . . . . . . . . . . . . . . . . .210
Aluminum Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211 - 212
Aluminum Closure Strips and End Caps . . . . . . . . . . . . . . . . . .212
PRIMEANGLE™ . . . . . . . . . . . . . . . . 213-218
PrimeAngle™. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .215
PrimeAngle™ Technical Data . . . . . . . . . . . . . . . . . . . . . 216 - 218
UNITED INTERLOCK® GRATING. . . 219-234
Ease of Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
Plank Grating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221 - 222
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223 - 225
Heavy Duty Stair Treads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .226
Design and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227
Plank Loads and Deflections . . . . . . . . . . . . . . . . . . . . . . 228 - 233
Architectural Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .234
ROOFWALKS® . . . . . . . . . . . . . . . . 235-236
Roofwalk® Grating Planks . . . . . . . . . . . . . . . . . . . . . . . . . . . . .236
Hardware for Membrane, Foam or Coated Roof . . . . . . . . . . . .236
Standing Seam Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .236
INDEX . . . . . . . . . . . . . . . . . . . . . . . 237-242
Unistrut Metal Framing – The Original Strut System
Featuring The Unique Weldless Connection
Hex-head bolt connects
fitting to channel as it
is threaded into spring
nut.
Chamfer in the nut
eases starting of the
bolt. Nut teeth create
a strong, vise-like grip
when tightened against
the inturned channel
edges.
Channel edges and the
nut's tapered grooves
act as guides to provide
fool-proof alignment of
connection.
Nut teeth grip the
channel's inturned
edges, tying the
channel sides together
in a "box" configuration
for added strength.
Spring allows precision
placement anywhere
along channel length,
then holds the nut in
position while the
connection is
completed.
6
Unistrut – The Original Metal Framing
Unistrut Connection
Strong, Fast, Economical and Adjustable
Insert the spring nut anywhere
along the continuous slotted
channel. The rounded nut ends
permit easy insertion.
2
1
A 90° clockwise turn aligns
the grooves in the nut with the
inturned edges of the channel.
Fittings can be placed anywhere
along the channel opening,
permitting complete freedom of
adjustment. The need for drilling
holes is eliminated.
3
Insert the bolt through the
fitting and into the spring
1
nut. (See illustration 5 for
end view showing the nut in
place)
4
Q
100% Adjustable
Q
100% Reusable
Q
No Welding
Q
No Drilling
Q
No Special Tools
Additional channel sections can
now be bolted to the fitting
already in place by following
procedure described in steps 1–3.
5
Tightening with a wrench
locks the serrated teeth of the
nut into the inturned edges
of the channel, to complete a
strong, vise-like connection.
Unistrut – The Original Metal Framing
7
Unistrut Service Centers
Serving Design
Professionals for
Over 85 Years
Unistrut products have been
helping to build a better world
since 1924. Used extensively in
nuclear, industrial and commercial construction markets
for over 85 years, Unistrut Metal Framing has set the standard
for product design, quality and
performance.
The initial Unistrut concept —
a simple spring nut and bolt
connecting a fitting to a
continuous slotted channel —
has evolved into a comprehensive engineered building and
support system.
Unistrut® — The Original
Metal Framing System
There is only one Unistrut
Metal Framing System. It
incorporates the innovative
product improvements that
our research and development
group has created to give you
the most complete and flexible support system available.
Backed by our worldwide
network of engineering and
distribution centers, Unistrut
provides customers with totalresource capability.
A North American network
of Unistrut Service Centers —
stocking standard Unistrut
components — are located
in principal cities to serve you
quickly and directly. Many
Service Centers are equipped
to design and supply drawings
for any type of metal framing application and also offer
fabrication and installation
services.
This catalog is a comprehensive
presentation of Unistrut Metal
Framing components plus technical data required by design,
specification and construction
professionals.
®
8
Unistrut – The Original Metal Framing
Unistrut Framing Systems
THE MOST COMPLETE METAL FRAMING SYSTEM — FOUR CHANNEL-WIDTH OPTIONS
Adjustability, demountability and reusability are engineered into each of the four Unistrut channel series.
Each series offers channels of varying depth and gage plus a complete line of fittings and accessories.
15»8” (41.3 mm) width
5
1 »8" width Series Channel
1 5⁄ 8"
VARIOUS
HEIGHTS
AVAILABLE
Designed to carry the heaviest
loads and provide the widest
variety of applications, the 15»8"
series has become the accepted
standard for use in mechanical,
electrical and general construction
applications where supports and
attachments must meet the highest strength requirements.
11»2” (38.1 mm) width
11»2" width Series Channel
1 1⁄ 2"
VARIOUS
HEIGHTS
AVAILABLE
A framing system designed for
medium to heavy loads, the
11»2" series offers hole spacing
and fittings where all parts
fit together, no matter where
they’re used, or at what angle.
11»4” (31.8 mm) width
11»4" width Series Channel
1
1 ⁄ 4"
VARIOUS
HEIGHTS
AVAILABLE
A framing system designed for
medium loads, the 11»4" series is
especially suitable for use in the
OEM, commercial and display
markets. It maintains a lightness in scale and a clean line that
makes it aesthetically pleasing
as well as functional.
13
13
»16" width Series Channel
13
⁄16"
VARIOUS
HEIGHTS
AVAILABLE
Unistrut – The Original Metal Framing
»16” (20.6 mm) width
A unique half-size reduction of
the 15»8" channel-width series, this
smaller channel size can be used
to carry light loads economically
in applications such as instrumentation, retail displays and lightduty laboratory supports. It also
provides the flexibility found in
all Unistrut framing systems.
9
Quality Assurance and Traceability
PRODUCT LOAD TESTING
Product testing is an important
part of Unistrut’s Quality
Assurance Program. We utilize
our own testing facilities, as well
as those of independent testing
laboratories, to determine design
loads with proper and adequate
safety factors. These design loads
are indicated, where applicable,
throughout the catalog. Loads are
based on AISI Specification For
The Design Of Cold-Formed Steel
Structural Members, 2007 Edition.
Destructive and non-destructive
testing procedures are used to test
for variables such as corrosion,
conductivity, electro-static
dissipation, ultra-violet resistance,
wind resistance, dimensional
accuracy, material integrity and
slip resistance.
In short, if there’s a specification
to meet, Unistrut will develop
a test to quantify and verify it.
Using design properties of the
Unistrut framing members, load
data given in this catalog, and/or
design procedures of the
American Iron & Steel Institute
Specification For The Design Of
Cold-Formed Steel Structural
Members, 2007 Edition, it is
possible to design any type of
structure within the capabilities
of the system.
Assemblies or connections that
cannot be calculated using
provisions of the AISI specifications
must be established by applicationspecific tests.
QUALITY PROGRAM
Unistrut is committed to being
the “best” in the metal framing
industry. In order to meet this
goal, Unistrut has adopted the
philosophy of “Zero Defects and
Continuous Improvement”. This
means on-going reviews of our
manufacturing processes,
operating procedures and quality
systems to find ways of improving
efficiency, productivity and quality. It means establishing process
controls and problem-prevention
techniques to ensure that superior
quality is built into every Unistrut
product.
Our drive to be the best includes
not just quality products, but
on-time delivery and prompt
resolution of customer needs and
concerns. At Unistrut, quality is
number one.
TRACEABILITY
Unistrut channel is stamped with a
numeric code that allows traceability
to the origin of the steel
10
Unistrut – The Original Metal Framing
Materials and Finishes
MATERIAL
Framing Members
Nuts and Bolts
Fittings
Unistrut channels and continuous
inserts are accurately and carefully cold-formed to size from
low carbon strip steel. One side
of the channel has a continuous
slot with inturned edges. Secure
attachments may be made to the
framing member with the use of
hardened, toothed, slotted nuts
which engage the inturned edges.
Unistrut nuts are made from
steel bars. After all machining
operations are complete, they
are thoroughly case hardened.
Nuts are rectangular with ends
shaped to permit a quarter turn
clockwise in the framing member
after insertion through the slotted
opening in the channel. Two
toothed grooves in the top of the
nut engage the inturned edges
of the channel and, after bolting
operations are completed, will
prevent any movement of the
bolt and nut within the framing
member.
Unistrut fittings, unless noted
otherwise, are punch-press made
from hot rolled, pickled and oiled
steel plates, strip or coil, and
conform to ASTM specifications
A575, A576, A635 or A36. The
fitting steel also meets the
physical requirement of ASTM
A1011 SS GR 33. The pickling
of the steel produces a smooth
surface free from scale.
Raw steel shall conform to the
following ASTM specifications:
GAGE
12
14
16
19
FINISH
ASTM NO.
GR & HG
A1011 SS GR 33
PG
A653 GR 33
GR & HG
A1011 SS GR 33
PG
A653 GR 33
GR & HG
A1011 SS GR 33
PG
A653 GR 33
GR
A1008
All bolts and nuts have Unified
coarse screw threads. The standard
framing nut is 1»2" and conforms to
ASTM A576 GR 1015 modified and
A1011 SS GR 45. Screws conform
to SAE J429 GR 2.
WEIGHTS AND DIMENSIONS
Weights given for all materials are
approximate shipping weights.
All dimensions are subject to
commercial tolerance within
published specifications.
®
WE RESERVE THE RIGHT TO MAKE SPECIFICATION CHANGES
WITHOUT NOTICE.
WHILE EVERY EFFORT HAS BEEN MADE TO ASSURE THE ACCURACY
OF INFORMATION CONTAINED IN THIS CATALOG AT THE TIME OF
PUBLICATION, WE CANNOT ACCEPT RESPONSIBILITY FOR
INACCURACIES RESULTING FROM UNDETECTED ERRORS OR OMISSIONS.
THE BLUE COLOR USED ON UNISTRUT COMPONENTS ILLUSTRATED
IN THIS CATALOG IS FOR GRAPHIC ENHANCEMENT ONLY, AND DOES
NOT REPRESENT ACTUAL PRODUCT COLOR.
Unistrut – The Original Metal Framing
11
Finishes
Perma-Green® III
The performance of Unistrut’s Perma-Green III
far exceeds that of conventional finishes. And
compared to competitive “high-performance” coatings,
Perma-Green III provides superior resistance to chalking, checking and fading and is far less vulnerable to
common acidic atmospheres, solvents and alkalis.
First stage hot
alkaline cleaning
of channel.
Second stage
hot alkaline
cleaning of
channel.
Channel is rinsed
with clean water
to remove
cleaning
solution.
Conditioning
rinse.
Second stage
deionized water
rinse to prepare
channel for
E-Coating.
Final deionizer
water rinse.
Electro-deposition Post rinse spray.
tank applies the
epoxy PermaGreen III to all
surfaces.
Just as important, Perma-Green III is the result of
an environmentally neutral process that virtually
eliminates the toxic metals commonly found in
competitive paint-based finishes.
Channel is
phosphated to
produce a
phosphate
coating.
Channel is rinsed
to remove
excess
phosphate
solution.
Sealer is applied.
First stage
deionizer water
rinse to remove
excess sealer.
Post rinse dip
tray.
Post rinse spray.
Virgin deionized
water halo rinse.
The oven cure
process dries the
channel and cross
links the epoxy
thermoset resins at
375° F.
PERMA-GREEN® III (GR) TECHNICAL DATA
Sealer
Phosphate
Prepared
Steel
12
E-Coat
STEEL SUBSTRATE PREPARATION
Ten stage continuous cleaning,
phosphate process.
Substrate after “prep”: sealed
phosphate conversion coating.
COATING
Thermoset epoxy
Color:
Federal Highway Green
Color Tolerance Chart
PR Color No. 4
Hardness: 2H.
Coating Process:
Cathodic Electrodeposition.
PERFORMANCE
Salt Spray:
Scribed: exceeds 400 hours per
ASTM B117. (1»8" creep)
Unscribed: exceeds 600 hours per
ASTM B117. (6% red rust)
Chalk:
Nominal at 1,000 hours per
weatherometer G-23 test.
Checking:
None at 1,000 hours per
weatherometer G-23 test.
Fade:
Less than 50% compared to
standard epoxy E.C. coatings.
ENVIRONMENTAL ISSUES
Formulated as a “heavy metal”-free
coating (trace elements only).
Outgassing in service: essentially none
at 350°F for 24 hours.
Unistrut – The Original Metal Framing
Finishes
PLAIN (PL)
Electroplated Zinc (EG)
Zinc Coating
Plain finish designation means that
the channel retains the oiled surface
applied to the raw steel during the
rolling process.The fittings have the
original oiled surface of the coil or
strip steel material.
ASTM B633, Type III SC1 or SC3
Unistrut products are available in four
types of zinc coatings:
Pregalvanized Zinc (PG)
ASTM A653
3# -ILD HAS A :INC COATING OF
and is recommended for dry indoor
use. SC1 is the standard finish thickness.
3# 3EVERE HAS A :INC COATING OF
0.5 mill and is the standard finish
thickness only on UL Listed raceway
products.
Pregalvanized steel is zinc coated by
a hot dip process. Steel strip from a
coil is fed through a continuous zinc
coater which cleans, fluxes and coats
the steel with molten zinc. After cooling, the steel is recoiled.
The pregalvanized zinc coating
conforms to a G-90 thickness
designation per ASTM A653.
The zinc thickness is .75 MIL or
.45 oz./sq. ft. of surface area.
In the electroplating process, the
part to be zinc coated is immersed
in a solution of zinc ions. An electric
current causes the zinc to be
deposited on the part.
s %LECTROPLATED %'
s 0ERMA
'OLD :$
s 0REGALVANIZED 0'
s (OT $IP 'ALVANIZED ('
:INC OFFER TWO TYPES OF PROTECTION
s Barrier: The zinc coating protects
the steel substrate from direct
contact with the environment.
s Sacrificial: The zinc coating will
protect scratches, cut edges, etc.
through an anodic sacrificial
process.
Perma-Gold (ZD)
The service life of zinc coating is
directly related to the zinc coating
thickness as shown below.
ASTM B633, Type II SC3
Similar to the EG process except in a
yellow color.
Comparison of Zinc Finishes
(OT $IP 'ALVANIZED
Pre-galvanized
Electro-Galvanized (SC1)
Electro-Galvanized (SC3)
Perma-Gold (SC3)
In hot dip galvanizing, the finished
part is immersed in a bath of molten
zinc. This method results in complete
zinc coverage and a thicker coating
than pregalvanized or plated zinc.
Life of Protection vs. Thickness of Zinc
and Type of Atmosphere
* Service Life is defined as the time to 5% rusting of the steel surface
80
The zinc coating is typically 2.6 MIL or
1.5 oz./sq. ft. of surface area.
When specific applications require
other than standard available finishes,
special finishes can be supplied per
customer requirements.
11
21
32
43
54
65
75
86
97
108 118 129
70
L
RA
RU
Service Life, Years*
SPECIAL COATING
2.6 MIL
0.75 MIL
0.2 MIL
0.5 MIL
0.5 MIL
As shown in the graph, when the zinc
coating is double, the service life is
double under most conditions.
HOT DIP GALVANIZED (HG)
ASTM A123 OR A153
This is the coating of choice for
applications where severe corrosion is
a design factor.
Zinc
Thickness
Finish
This coating is offered on Unistrut
channel and tubing and is a well-proven, time-tested performer for indoor
and outdoor applications. For severe
corrosion applications, hot dip galvanizing, as described below, is a good
alternative.
60
E
RIN
MA INE
L
ICA MAR
OP
TR RATE
E
P
TEM
BAN L
UR
A
B
U
TRI
S
DUS
Y IN
L
E
RAT
50
40
30
DE
MO
20
IAL
USTR
Y IND
HEAV
10
Oz. of Zinc/Sq. Ft. of Surface
.25
.50
.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00
0.4
0.8
1.3
Thickness of Zinc in Mils
Unistrut – The Original Metal Framing
1.7
2.1
2.6
3.0
3.4
3.8
4.2
4.7
5.1
13
Design Fundamentals
BEAMS
Beams are structural members loaded
at right angles (perpendicular) to their
length. Most beams are horizontal and
subjected to gravity or vertical loads,
e.g. a shelf support. However a vertical
member can act as a beam under certain
conditions, such as a curtain wall mullion
subjected to wind loading.The bending
moment developed in a beam is dependent on:
(a) The amount of load applied,
(b) The type of loading applied, and
(c) The support conditions
SUPPORT CONDITIONS CONTINUOUS BEAM
Any simple beam that is supported at one
or more intermediate points is a continuous beam. A mezzanine joist that passes
over three or more columns is an example
of a continuous beam.
SUPPORT CONDITIONS FIXED-END BEAM
BEAM LOADING - POINT LOAD
A load concentrated onto a very small
length of the beam is a point load.
BEAM LOADING - UNIFORM LOAD
Supports that prevent the beam from
rotating into a natural deflected curve
produce a fixed-end beam. A welded end
connection to very rigid support produces
a fixed-end beam.
SUPPORT CONDITIONS CANTILEVER BEAM
A load spread evenly over a relatively long
length of the beam is a uniform load.
Point and uniform loads can be placed on
a beam in any combination. A series of
point loads can approximate a uniform
loading. The load charts and tables are
based on a uniform load unless identified
otherwise.
A cantilever beam is a fixed-end beam that
is supported at one end only, while the
other end is unsupported. Unistrut brackets are examples of cantilever beams.
DEFLECTION
SUPPORT CONDITIONS - SIMPLE BEAM
A simple beam has supports that prevent
movement left and right, or up and down,
but do not restrain the beam from rotating
at the supports into a natural deflected
curve. Most Unistrut Metal Framing connections produce simple beams. The load
charts and tables are based on simple
beams unless identified otherwise.
14
The stiffness of the beam’s cross-sectional
shape is measured by its “Moment Of
Inertia” or "I". The larger a beam’s "I", the
stiffer it is and the less it will deflect. A
beam’s "I" can change for each major axis.
The "I" of both major axes (I 1-1 and I 2-2)
are provided.
The stiffness of a beam’s material is measured by its “Modulus of Elasticity” or "E".
The larger a material’s "E", the stiffer it is
and the less it deflects. For example, steel
is about three times stiffer than aluminum
and as a result, deflects only one-third
AS MUCH $O NOT CONFUSE STIFFNESS WITH
strength. Two materials may have identical
strengths yet still have different "E’s". A
high-strength aluminum may be as strong
as steel and still deflect three times as
much.
The load charts and tables give calculated
deflections for the loads shown. In many
cases, a final design will be determined by
the maximum deflection, not the maximum load.
BENDING MOMENT
Is it strong enough? This is the final
consideration for any beam. A beam must
not only hold up the anticipated loads, but
must also have sufficient additional capacity to safely hold unforeseen variations
in applied loads and material strengths.
This additional capacity is called a safety
factor and is usually regulated by the
various design codes and standards. A
beam’s strength is usually measured by an
allowable bending moment or an allowable stress. The traditional approach is the
allowable stress method, where a beam is
determined to have a maximum allowable
stress (in pounds per square inch) which
is not to be exceeded.
The approach of the current AISI “SpecilCATION &OR