M4 Reducers | McMaster-Carr

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417 Products

Thread Adapters

Male-Female Thread Adapters

Metric-to-Metric Male-Female Hex Thread Adapters

Increase or decrease metric thread size and change the pitch

57 products

Inch-to-Metric Male-Female Hex Thread Adapters

Change inch threads to metric

59 products

Female Thread Adapters

Metric-to-Metric Female Hex Thread Adapters

Join two male-threaded parts with dissimilar metric thread sizes

35 products

Inch-to-Metric Female Hex Thread Adapters

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

32 products

Male Thread Adapters

Metric-to-Metric Male Hex Thread Adapters

Join two female-threaded parts with dissimilar metric thread sizes

31 products

Inch-to-Metric Male Hex Thread Adapters

Join inch and metric female-threaded parts

1 product

Other Products

Threaded Inserts

Create new threads or repair stripped threads

149 products

Threaded Insert Installation Tools

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

28 products

Rivet Nuts

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

30 products

Socket Nuts

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

1 product