4-40 Pins | McMaster-Carr

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System of Measurement

Fastener Head Type

Shoulder Diameter

Shoulder Length

Drive Style

Thread Length

Material

18-8 Stainless Steel

Thread Direction

Length

Shoulder Fit

Head Diameter

Head Height

Thread Spacing

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

DFARS Specialty Metals

PEM® Part Number

Export Control Classification Number (ECCN)

REACH

RoHS

Thread Type

Threading

Minimum Shear Strength

Tensile Strength

Head Width

Finish

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40 Products

Fastening and Joining

Shoulder Screws

Shoulder Screws

Rotate parts around the cylinder under the head to guide and align them during installation

Tighten and loosen by hand without the need for tools

Studs

Press, weld, or screw in place to add a threaded fastening point

Machine Keys

Transmit torque from rotating shafts to gears, sprockets, and other machine parts

Stud Welders

Join studs and pins to metal, leaving no marks on the back of the material

Measuring and Inspecting

Plug Gauges

Verify the diameter or threads of machined holes in finished parts; also called pin gauges

Threaded Hole Location Gauges

Threaded Hole Location Gauges

Pinpoint the true center of threaded holes to precisely align and measure parts

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)