6-40 Fasteners | McMaster-Carr

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Thread Size

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Fastener Head Type

Material

Stainless Steel

Drive Style

Threading

Partially Threaded

System of Measurement

Head Diameter

Thread Spacing

Thread Type

Finish

Socket Head Profile

Drive Size

Head Height

Thread Direction

Specifications Met

Federal Specification

Tip Type

Rounded Head Style

Tensile Strength

30,000 psi to 99,999 psi

100,000 psi or greater

RoHS

Compliant with Exemptions

Flat Head Profile

REACH

Export Control Classification Number (ECCN)

Countersink Angle

DFARS Specialty Metals

Thread Fit

Metric Class 6g

Metric Class 6H

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

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145 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

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

Set Screws

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

Hex Nuts

Handle most general fastening needs

Locknuts

Hold fasteners in place to prevent loosening from vibration

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

Flange Nuts

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

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

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.)