Page 125 - Cable Art Inc Catalog

Structural Rod Systems

Clevis Overview

Applications
Clevises are used to connect the rods and hanger assemblies edition, pages 15-14 and 15-15. Carbon and alloy steel
to structural steel of fabricated lugs. The pin connection clevises are forged per ASTM A668. Stainless steel clevises
ensures that the rod is loaded only in tension and sees no are forged per ASTM A473.
bending forces. Our clevises are widely used in structural steel Materials
bracing and pipe support applications.
Clevis forgings are available in C1035 steel, ASTM A668
Class A, and 316 stainless steel, ASTM A473 Designation A.
Heat-treated carbon and alloy steel clevises are available by
special order.
Finishes
Standard finish for carbon steel clevises is plain steel, shot
blasted after forging. Hot dip galvanizing is available as well
as zinc electroplating. Standard processing for stainless steel
clevises after forging is pickling and passivation. An electro-
polished finish is also available for stainless steel parts.
Threads
Length adjustment of rod assemblies can be provided by Standard threads are UNC 2B, with the UNF thread series
paring RH and LH threaded clevises with single lengths of and metric M profile also available. We can also provide
rod or by using RH threads on both clevises with two rods clevises with pipe threads for non-structural applications.
and a turnbuckle or sleeve nut. Hot dip galvanized clevises are normally tapped oversize
after galvanizing to accommodated the zinc coating on
RH LH
the rod threads.
Notes Regarding Strength
The AISC safe working load listed in Clevis Table 1 is based
Length adjustment: 2x rod diameter on the net tensile area through the maximum pin hole,
60,000 The allowable pin and tap size combinations in Clevis
RH LH RH RH Table 2 are based on maintaining a net tensile stress area
though the pin hole at 125% of the UNC tensile stress area
of the rod. All of the pin diameters shown in Clevis Table 2
will likewise exceed the corresponding rod strength based STRUCTURAL ROD SYSTEMS
Length adjustment 3” - 12” on shear, but they should be investigated for bending if large
depending on turnbuckle or sleeve nut used grips are used (greater than 1-1/2”) and there is a significant
difference between the material thickness and the grip
size (greater than 1/2”). The threaded area of carbon steel
Relevant Standards clevises forged to ASTM A668 Class A is equivalent to
an ASTM A563 Grade C heavy hex nut. For high-strength
Clevises are manufactured to meet the dimensions and
load ratings shown in the American Institute of Steel applications, our carbon steel clevises can be heat treated up
Construction Inc. (AISC) Steel Construction Manual, 13th through ASTM A668 Class ‘F’.

Specifying and Ordering Clevises

• Determine clevis number based on safe working load and rod • Determine grip size based on the thickness of the material
size using Clevis Table 1. Your application’s maximum load that will receive the pin. The grip size is normally specified
should be less than or equal to value shown in ‘Safe Working as material thickness + 1/4”, however the minimum grip for
Load’ column, and your rod size should be less than or equal #2 through #3 clevises is 3/4”, #3-1/2 is 7/8” and 1” for #4
to number shown in ‘Maximum Tap Size’ column. If not, through #7 clevises. Grip dimensions are normally called
select a larger size clevis. out in 1/4” increments.
• Select pin diameter using Clevis Table 2 by locating your rod • Specify the desired finish (typically plain or HDG) and any
(tap) size in the first column, then moving across that row to other special requirements.
find your clevis size. The allowable pin diameters are listed at
the top of each column where your clevis number appears.

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