5/16"-18 Adapters | McMaster-Carr

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UN/UNF (SAE Straight)

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Tensile Strength

40,000 psi to 49,999 psi

50,000 psi to 59,999 psi

60,000 psi to 99,999 psi

100,000 psi or greater

Not Rated

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Adapter

DFARS Specialty Metals

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Unified Standard Class 1A

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For Tap Thread Size

Nut Type

632 Products

Thread Adapters

Male-Female Thread Adapters

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

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

Connect float rods to float valves with the through hole

4 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

39 products

Left-Hand to Right-Hand Male Thread Adapters

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

4 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

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

3 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

4 products

Other Products

Threaded Inserts

Create new threads or repair stripped threads

82 products

Tube Fittings

Make threaded, push to connect, barbed, and other types of connections between lengths of tube

5 products

Adhesive-Mount Nuts

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

10 products

Battery Terminal Adapters

Convert one battery terminal style to another

2 products

Tube-Connecting Nuts

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

7 products

Battery Terminal Fasteners

Replace bolts in battery terminals

2 products

Leveling Mount Inserts

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

6 products

Robot Workstations

Create a portable working home for your robot arm

1 product

Rod Ends

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

48 products

Weld Nuts

Weld to metal surfaces to add permanent threads

40 products

Studs

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

14 products

Shaft Couplings

Connect two shafts to transfer rotary motion from one to the other

12 products

U-Joints

Transfer torque between shafts at an angle; handle more torque and misalignment than flexible shafts

2 products

Pipe Threader Dies

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

1 product

Slide Hammer Adapters for Locking Pliers

Attach your locking pliers to a slide hammer to pull stubborn objects

1 product