4-40 Helicoils | McMaster-Carr

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System of Measurement

Helical Insert Type

Material

Installed Length

Specifications Met

For Tap Type

Thread Type

Thread Direction

Military Specification

For Insert Thread Size

Passivation

Drill Bit Size

Number of Inserts Included

Finish

DFARS Specialty Metals

RoHS

Compliant with Exemptions

Chamfer Type

REACH

Tensile Strength

Export Control Classification Number (ECCN)

For Use On

Thread Spacing

For Insert Thread Type

UNC

Pitch Diameter Limit

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59 Products

Fastening and Joining

Threaded Inserts

Create new threads or repair stripped threads

47 products

Threaded Insert Installation Tools

Install helical, key-locking, slotted-drive, and other threaded inserts

5 products

Threaded Insert Removal Tools

Turn counterclockwise to extract helical inserts

3 products

Fabricating and Machining

Taps

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

2 products

Measuring and Inspecting

Plug Gauges

Verify the diameter or threads of machined holes in finished parts; also called pin gauges

2 products