Step Bolts: Dimensions & Specifications

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Step Bolts

Nominal or Basic Product Diameter

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Diameter of Full Size Body (E) Diameter of Head (A) Head Height (H) Square Width (O) Square Depth (P)
Max Min Max  Min Sharp Max Min  Max Min  Max Min (Basic)
10 10.000 .199 .182   .656 .625  .114 .094 .199 .185 .125 .094
1/4 .2500 .260  .237 .844 .813 .145 .125 .260 .245 .156 .125
5/16 .3125 .324  .298 1.031 1.000 .176 .156 .324 .307 .187 .156
3/8 .3750 .388  .360 1.219 1.188 .208 .188 .388 .368 .219 .188

 * Click on the nominal size to find products.

Step Bolts: Tolerance on Length
Nominal Bolt Diameter Up to 1 in., incl. Over 1 in. to 2-1/2 in., inl. Over 2-1/2 in. to 4 in., inl.
No. 10 through 3/8 +0.02, -0.03 +0.02, -0.04 +0.04, -0.06

 

Step Bolts: Performance & Mechanical Stats
Description Similar to a carriage bolt in bearing surface and square-neck design, but with a wider, lower-profile, round head.
Applications

Preferred for use where wood is bolted down as decking--the larger diameter head of the step bolt will not pull through the soft wood. Smooth, low, rounded head permits unrestricted movement over the surface.

Material
AISI 1006 - 1050 or equivalent steel.
Hardness

No. 10 through 3/8 in. diameter, all lengths: Rockwell B70 - B100

Tensile Strength

No. 10 through 3/8 in. diameter, all lengths: 54,000 psi. minimum

Elongation in 2 in. 18% minimum (all sizes)