3/8"-16 Adapters | McMaster-Carr

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Unified Standard Class 1A

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40,000 psi to 49,999 psi

50,000 psi to 59,999 psi

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731 Products

Thread Adapters

Male-Female Thread Adapters

Inch-to-Inch Male-Female Hex Thread Adapters

Change thread size and spacing

82 products

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

Connect float rods to float valves with the through hole

5 products

Inch-to-Metric Male-Female Hex Thread Adapters

Change inch threads to metric

54 products

Male Thread Adapters

Inch-to-Inch Male Hex Thread Adapters

Join two female-threaded parts with dissimilar inch thread sizes

50 products

Inch-to-Metric Male Hex Thread Adapters

Join inch and metric female-threaded parts

29 products

Left-Hand to Right-Hand Male Thread Adapters

Fasten parts with right-hand threads to parts with left-hand threads

8 products

Female Thread Adapters

Inch-to-Inch Female Hex Thread Adapters

Join two male-threaded parts with dissimilar inch thread sizes

53 products

Inch-to-Metric Female Hex Thread Adapters

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

29 products

Left-Hand to Right-Hand Female Hex Thread Adapters

Join two male-threaded parts with dissimilar metric thread sizes
Fasten parts with right-hand threads to parts with left-hand threads

5 products

Thread Adapters for Pullers

Pair with an external grip puller to pull shafts, bearing caps, and pinions

1 product

Hex Drive Thread Adapters

Join coarse threads to fine threads using a hex key

5 products

Other Products

Threaded Inserts

Create new threads or repair stripped threads

132 products

Weld Nuts

Weld to metal surfaces to add permanent threads

30 products

Battery Terminal Adapters

Convert one battery terminal style to another

5 products

Positioning Arms

Mount and position tools and other small equipment

10 products

Tube-Connecting Nuts

Push inside tubes to join them with a threaded stud instead of welding

2 products

Studs

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

19 products

Adhesive-Mount Nuts

Attach threads to material that’s too thin for a threaded insert

8 products

Battery Terminal Fasteners

Replace bolts in battery terminals

1 product

Leveling Mount Inserts

Slip onto equipment and furniture to add threaded-stud leveling feet

27 products

Positioning Arm Mounts

Add a mounting surface to positioning arms

2 products

Pipe Threader Dies

Install in the die head on your Ridgid pipe threader to cut external pipe and conduit threads

1 product

Air Cylinders

Push and pull loads to do everything from stamping materials to sorting parts on conveyors

90 products

Rod Ends

Use with connecting rods to support loads and control steering, tensioning, or pivoting motion

68 products

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

3 products

Flexible Shaft Coupling Hubs

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

6 products