5/16"-18 Helicoils | McMaster-Carr

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Helical Insert Style

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5/16"-18

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Specifications Met

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56 Products

Fastening and Joining

Threaded Inserts

Create new threads or repair stripped threads

42 products

Threaded Insert Installation Tools

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

6 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

3 products

Measuring and Inspecting

Plug Gauges

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

2 products