Square Head Set Screws - Cup Point

Square head set screws with a cup point, made from case hardened steel. The square head is tightened with a wrench and stays above the part, so they are easy to adjust, and the cup point bites into the shaft. We stock 1/4"-20, 5/16"-18, 3/8"-16, 1/2"-13, 5/8"-11, 3/4"-10, 7/8"-9, 1"-8 USS coarse thread, fully threaded, in lengths from 3/4" to 6". Choose a size below.

Specifications

Material: case hardened steel
Finish: plain
Thread: USS coarse (UNC), class 2A, fully threaded
Point: cup
Sizes: 1/4"-20, 5/16"-18, 3/8"-16, 1/2"-13, 5/8"-11, 3/4"-10, 7/8"-9, 1"-8
Lengths: 3/4" to 6" (measured under the head)
Dimensions: ASME B18.6.2

Square head set screws are fully threaded screws made from case hardened steel. They are used for holding pulleys, collars and other machinery shafts.

Common Uses

Pulleys and sheaves
Shaft collars
Farm and heavy equipment
Machinery adjustments

FAQ

Square head or socket set screw?
A square head set screw sticks out above the part and is tightened with a wrench, so it can be tightened harder and is easy to see and adjust. A socket set screw sits flush or below the surface.

What wrench fits a square head set screw?
The width across the flats of the head equals the screw diameter, so a 1/2" set screw takes a 1/2" wrench.

Will square head set screws rust?
They have a plain finish with no plating, so keep them oiled. They are not for outdoor or wet use.

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