Metric Allen Keys | McMaster-Carr

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System of Measurement

Unit of Measure

Drive Size

Tip Style

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Drilled Spanner

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External Square

Hex with Pilot Recess

Tamper-Resistant Hex

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Driver Style

Finish

Magnesium Phosphate Coated

Phosphate Coated

Titanium Aluminum Nitride (TiAlN) Coated

Titanium Nitride (TiN) Coated

Zinc Phosphate Coated

Overall Length

15/16" to 1 1/8"

1 1/4" to 1 3/8"

1 1/4" to 4 11/16"

1 5/16" to 4 11/16"

Long Leg Length

Material

Aluminum Bronze

Beryllium Copper

Stainless Steel

Color

Short Leg Length

Relative Length

Length

15/16" to 1 1/8"

1 1/4" to 1 3/8"

1 1/4" to 4 11/16"

1 5/16" to 4 11/16"

Number of Pieces

Ball Location

Grip Style

Container Type

Compartmented Plastic Box

Metal Clip Rail

Metal Wall-Mount Case

Plastic Clip Rail

Plastic Roll-Up Pouch

Performance

Changeable Shaft

Corrosion Resistant

Drop Prevention

Electrically Insulating

Precise Control

Driver Type

REACH

RoHS

DFARS Specialty Metals

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Export Control Classification Number (ECCN)

How can we improve?

2,131 Products

L-Keys

L-Keys

Precision manufactured L-keys for tightening and loosening screws

Easy-Align Ball-Tip L-Keys

Easy-Align Ball-Tip L-Keys

Turn screws at an angle when you can't access them head on

Easy-Align Ball-Tip L-Key Sets

Easy-Align Ball-Tip L-Key Sets

Reach corners and tight spaces with the sizes you use most

Stubby Easy-Align Ball-Tip L-Keys

Stubby Easy-Align Ball-Tip L-Keys

An extra-short leg squeezes into spots with low overhead clearance

L-Key Sets

Keep a selection of top-quality L-keys on hand, so you always have the size you need

Color-Coded Easy-Align Ball-Tip L-Key Sets

Color-Coded Easy-Align Ball-Tip L-Key Sets

Take the guesswork out of picking the right drive size

Stubby Easy-Align Ball-Tip L-Key Sets

Stubby Easy-Align Ball-Tip L-Key Sets

An extra-short leg squeezes into spots with low overhead clearance

Screw-Holding Easy-Align Ball-Tip L-Keys

Screw-Holding Easy-Align Ball-Tip L-Keys

Grip screws to start and remove them in hard-to-reach places

Nonmagnetic L-Keys

Nonmagnetic L-Keys

Won't damage electronic equipment or attract loose metal parts and shavings

Screw-Holding Easy-Align Ball-Tip L-Key Sets

Screw-Holding Easy-Align Ball-Tip L-Key Sets

Grip screws and engage at an angle so you can fasten with one hand in cramped spots

Nonsparking L-Keys

Nonsparking L-Keys

Won't create sparks when scraped, struck, or dropped

Wall-Mount L-Key Sets

Wall-Mount L-Key Sets

Mount at your workstation so your L-keys are always in reach

Fold-Up L-Key Sets

Fold-Up L-Key Sets

Tuck into the handle like a Swiss army knife for easy carrying

Quick-Change Fold-Up L-Key Sets

Quick-Change Fold-Up L-Key Sets

Select the key you need without unstacking the others from the handle

Easy-Align Ball-Tip Fold-Up L-Key Sets

Easy-Align Ball-Tip Fold-Up L-Key Sets

Turn screws at an angle and tuck away like a Swiss army knife for easy carrying

Nonsparking L-Key Sets

Nonsparking L-Key Sets

Won't create sparks when scraped, struck, or dropped

Wall-Mount Easy-Align Ball-Tip L-Key Sets

Wall-Mount Easy-Align Ball-Tip L-Key Sets

Store L-keys that work in corners and tight spaces within reach

Other Products

T-Handle Keys

To turn fasteners in hard-to-reach spots, there's a long shaft and a grip for your whole hand

Screwdrivers

Tighten and loosen screws

Bit Sockets

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

Screwdriver Bits

Screwdriver Bits

Pair with drivers to turn screws

Driver Shafts

Attach to a handle to create your own driver tool, or pair with socket wrenches and power tools

Socket Bits

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

Torque Screwdrivers

Torque Screwdrivers

Apply precise torque as you fasten screws to prevent overtightening

Impact Drivers

More powerful than drills to drive screws through dense material and loosen stuck fasteners

Sockets

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

Socket Organizers

Socket Organizers

Arrange sockets at your workstation or carry them neatly around your facility

Bit Adapters

Connect a variety of bits to drills, powered screwdrivers, ratchet wrenches, and other turning tools

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