5/16"-18 Reducers | McMaster-Carr

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763 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

244 products

Threaded Insert Installation Tools

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

154 products

Gear Box Mounts

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

2 products

Rivet Nuts

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

48 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

21 products

Studs

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

2 products

Socket Nuts

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

1 product