1/4"-20 Adapters | McMaster-Carr

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Unified Standard Class 1A

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DFARS Specialty Metals

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

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Threaded on Both Ends

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922 Products

Thread Adapters

Male-Female Thread Adapters

Inch-to-Inch Male-Female Hex Thread Adapters

Change thread size and spacing

94 products

Inch-to-NPT Male-Female Hex Thread Adapters

Connect float balls, float rods, and valves

3 products

Inch-to-Metric Male-Female Hex Thread Adapters

Change inch threads to metric

83 products

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

Connect float rods to float valves with the through hole

5 products

Slotted-Drive Male-Female Round Thread Adapters

Install and remove with a screwdriver

3 products

Male Thread Adapters

Inch-to-Inch Male Round Thread Adapters

Finger tighten two female-threaded parts with dissimilar inch thread sizes

1 product

Inch-to-Inch Male Hex Thread Adapters

Join two female-threaded parts with dissimilar inch thread sizes

56 products

Inch-to-Metric Male Hex Thread Adapters

Join inch and metric female-threaded parts

50 products

Inch-to-Metric Male Round Thread Adapters

Finger tighten two female-threaded parts with inch and metric thread sizes

2 products

Left-Hand to Right-Hand Male Thread Adapters

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

5 products

Female Thread Adapters

Inch-to-Inch Female Hex Thread Adapters

Join two male-threaded parts with dissimilar inch thread sizes

55 products

Inch-to-Metric Female Hex Thread Adapters

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

53 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

4 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

49 products

Tripod Head Adapters

Mount ball-grip components such as arms and device grips to the top of tripods

1 product

Standoffs

Separate, position, or connect components in assemblies

102 products

Flap Wheel Arbors

Attach flap wheels to tools that accept a shank; also known as mandrels

5 products

Adhesive-Mount Nuts

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

18 products

Positioning Arms

Mount and position tools, small electronics, and displays

29 products

Backup Pads

Attach discs to power tools and reinforce the discs

1 product

Flap Wheel Adapters

Adapt flap wheels with a threaded stud to tools that have a threaded spindle

2 products

Rod Ends

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

72 products

Orifice Valves

Restrict the flow of liquids and gases to precisely control rate and pressure

3 products

Tube-Connecting Nuts

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

12 products

Studs

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

16 products

Weld Nuts

Weld to metal surfaces to add permanent threads

64 products

Shaft Couplings

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

10 products

Sanding Pad Arbors

Connect sanding pads to hand-held drills and die grinders

6 products

Eye Nuts

Pair with bolts or threaded rod to lift and hang components

2 products

Leveling Mount Inserts

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

7 products

Positioning Arm Mounts

Add a mounting surface to positioning arms

2 products

Slide Hammer Adapters for Locking Pliers

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

1 product

Pipe Threader Dies

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

1 product

U-Joints

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

8 products

Torque Limiters

Keep torque at or below a set limit to control tension or braking or protect machinery from overload

1 product

Power Supplies

Convert your facility's AC voltage to power equipment that runs on DC voltage

3 products