Metric Extensions | McMaster-Carr

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Unified Standard Class 2A

Unified Standard Class 2B

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3,463 Products

Fastening and Joining

Thread Adapters

Join threads of a different type, size, and gender

2,334 products

Coupling Nuts

Connect and extend threaded rods

183 products

Hex Nuts

Handle most general fastening needs

14 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

24 products

Sockets

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

15 products

Socket Bits

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

18 products

Measuring and Inspecting

Probe Stylus Accessories

Add components that extend length, adapt threads, or hold multiple styli at once

9 products

Building and Machinery Hardware

Adjustable Handles

Lift and turn to easily position and tighten components; also called clamping handles

323 products

Crank Handles

The offset handle gives extra leverage to maximize turning force

29 products

Electrical

Electrical Adapters

Change electrical connectors to another type, size, or gender

1 product

Electrical Sockets

Pair with plugs or receptacles to transmit power or data

11 products

Electrical Plugs

Pair with sockets or receptacles to transmit power or data

16 products

Power Transmission

Extension Springs

As stretched, springs become increasingly harder to pull

341 products

Facility and Grounds Maintenance

Wash Gun Nozzle Extensions

Attach to your wash gun nozzle to clean places out of arm's reach

2 products

Fabricating and Machining

Taps

Cut internal threads for fasteners, pipe, conduit, and more

36 products

Drill Bits

Create holes in metal, wood, plastic, concrete, and more

86 products

Material Handling

Robot Tool Extensions

Attach tools or extensions to robot arms

18 products

Conveyor Guide Clamps

Connect conveyor guides to each other and secure them in place

1 product