Federal Specification Hex Head Screws | McMaster-Carr

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System of Measurement

Thread Size

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Material

18-8 Stainless Steel

A286 Stainless Steel

Threading

Partially Threaded

Fastener Head Type

Specifications Met

Federal Specification

Fed. Spec. FF-S-85

Fed. Spec. FF-S-86

Fed. Spec. QQ-P-35

Military Specification

Drive Style

DFARS Specialty Metals

Head Width

Thread Type

Thread Direction

Head Height

Thread Spacing

Certification

Socket Head Profile

Tensile Strength

Less than 100,000 psi

130,000 psi or greater

Thread Fit

Unified Standard Class 2A

Unified Standard Class 3A

Hardness

RoHS

Export Control Classification Number (ECCN)

Head Diameter

REACH

Tip Type

Drive Size

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Fastening and Joining

Hex Head Screws

Hex Head Screws

Used with nuts to create a stronger joint than flat and rounded screws

Socket Head Screws

Socket Head Screws

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

Set Screws

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

Flat Head Screws

Flat Head Screws

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

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