5/16"-18 Reducers | McMaster-Carr

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Flexible Shaft Couplings

Threaded Insert Installation Tools

Threaded Inserts

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Unified Standard Class 2A

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DFARS Specialty Metals

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745 Products

Thread Adapters

Male-Female Thread Adapters

Inch-to-NPT Male-Female Hex Thread Adapters with Through Hole

Connect float rods to float valves with the through hole

4 products

Inch-to-Inch Male-Female Hex Thread Adapters

Change thread size and spacing

87 products

Inch-to-Metric Male-Female Hex Thread Adapters

Change inch threads to metric

80 products

Male Thread Adapters

Inch-to-Inch Male Hex Thread Adapters

Join two female-threaded parts with dissimilar inch thread sizes

50 products

Female Thread Adapters

Inch-to-Inch Female Hex Thread Adapters

Join two male-threaded parts with dissimilar inch thread sizes

47 products

Inch-to-Metric Female Hex Thread Adapters

Join two male-threaded parts with inch and metric thread sizes

44 products

Other Products

Threaded Inserts

Create new threads or repair stripped threads

243 products

Rivet Nuts

Add threads to thin panels with access from only one side; also known as blind inserts

48 products

Threaded Insert Installation Tools

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

153 products

Gear Box Mounts

Secure gear boxes that can’t be attached directly to a machine or other surface

2 products

Socket Nuts

Install in recessed holes and tight spots where a wrench won’t fit; also known as Allen nuts

1 product

Studs

Press, weld, or screw in place to add a threaded fastening point

2 products

Screw-Mount Nuts

Mount with screws, rivets, and nails to add threads to a surface

1 product

Flexible Shaft Coupling Hubs

Pair with spiders, discs, or grids for a complete flexible shaft coupling

4 products