3-56 Fasteners | McMaster-Carr

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System of Measurement

Thread Size

Length

Fastener Head Type

Material

18-8 Stainless Steel

Drive Style

Head Diameter

Threading

Partially Threaded

Thread Spacing

Rounded Head Style

Drive Size

Head Height

Finish

Thread Type

Socket Head Profile

Tip Type

Thread Direction

Specifications Met

DFARS Specialty Metals

RoHS

Compliant with Exemptions

Thread Fit

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Export Control Classification Number (ECCN)

Tensile Strength

30,000 psi to 99,999 psi

100,000 psi or greater

Hardness

Flat Head Profile

REACH

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67 Products

Fastening and Joining

Rounded Head Screws

Rounded Head Screws

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

Hex Nuts

Handle most general fastening needs

Locknuts

Hold fasteners in place to prevent loosening from vibration

Flange Nuts

The flange distributes pressure, so you don't need a washer

Threaded Inserts

Threaded Inserts

Create new threads or repair stripped threads

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