Allen Heads | McMaster-Carr

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System of Measurement

Thread Size

Length

Material

Stainless Steel

Fastener Head Type

Drive Style

External 12-Point

External Square

Hex with Pilot Recess

Tamper-Resistant Hex

Tamper-Resistant Torx

Finish

Magnesium Phosphate Coated

Phosphate Coated

Threading

Partially Threaded

Socket Head Profile

Drive Size

Head Diameter

Shoulder Length

Shoulder Diameter

Head Height

Thread Pitch

Thread Type

Thread Direction

Thread Spacing

Tip Type

Specifications Met

Federal Specification

Tensile Strength

Less than 20,000 psi

20,000 psi to 49,999 psi

50,000 psi to 79,999 psi

80,000 psi to 99,999 psi

100,000 psi or greater

Thread Length

DFARS Specialty Metals

RoHS

Compliant with Exemptions

REACH

Export Control Classification Number (ECCN)

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28,399 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

Flat Head Screws

Flat Head Screws

Fit in countersunk holes for a flush finish

Rounded Head Screws

Rounded Head Screws

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

Set Screws

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

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

Captive Panel Screws

Captive Panel Screws

Secure panels and enclosures while still having access to them

Binding Barrels and Screws

Binding Barrels and Screws

Thread together for a low-profile fastener

Bit Sockets

Turn fasteners with an internal drive style without slipping and damaging the drive

Sockets

Turn fasteners with an external drive style without slipping and damaging the drive

Open-End Wrenches

Open-End Wrenches

Tighten and loosen fasteners from the top or the side

Socket Retaining Rings

Socket Retaining Rings

Secure sockets and adapters to impact tools

Socket Bits

Switch out worn or damaged bits instead of replacing your entire bit socket

Ratchet Wrenches

Ratchet Wrenches

Adjust fasteners in tight spaces without removing and repositioning the wrench

Box Wrenches

Grip all sides of a fastener to prevent slipping

Wrench Heads

Attach to your ratchet wrench and socket extension to turn fasteners where clearance is limited

Water Meter Wrenches

Water Meter Wrenches

Turn meter couplings and shut-off valve nuts on water meters

Building and Machinery Hardware

Protective Caps

Protective Caps

Protect just about anything, including pipe, flanges, screws, and posts

Protective Plugs

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

Communication

Reference Charts

Reference Charts

Check decimal equivalents, drill sizes, or specifications for socket screws

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