3-56 Screws | McMaster-Carr

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System of Measurement

Thread Size

Length

Fastener Head Type

Drive Style

Head Diameter

Material

18-8 Stainless Steel

Threading

Partially Threaded

Thread Spacing

Rounded Head Style

Head Height

Drive Size

Finish

Socket Head Profile

Thread Type

Thread Direction

Specifications Met

Flat Head Profile

Tensile Strength

30,000 psi to 99,999 psi

100,000 psi or greater

Thread Fit

Unified Standard Class 2A

Unified Standard Class 3A

RoHS

Compliant with Exemptions

DFARS Specialty Metals

Hardness

Export Control Classification Number (ECCN)

Countersink Angle

REACH

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54 Products

Fastening and Joining

Socket Head Screws

Socket Head Screws

With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold

Rounded Head Screws

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

Flat Head Screws

Flat Head Screws

Fit in countersunk holes for a flush finish that won't snag on surrounding parts

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

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