Screw Adapters | McMaster-Carr

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20,000 psi to 59,999 psi

60,000 psi to 79,999 psi

80,000 psi to 99,999 psi

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Unified Standard Class 1A

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Zinc Yellow-Chromate Plated

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5,374 Products

Thread Adapters

Male-Female Thread Adapters

Inch-to-Inch Male-Female Hex Thread Adapters

Change thread size and spacing

473 products

Inch-to-Metric Male-Female Hex Thread Adapters

Change inch threads to metric

770 products

Metric-to-Metric Male-Female Hex Thread Adapters

Increase or decrease metric thread size and change the pitch

238 products

Slotted-Drive Male-Female Round Thread Adapters

Install and remove with a screwdriver

7 products

Male-Female Round Universal Thread Adapters with Through Hole

Air, liquids, wire, and other thin materials flow through the hole

3 products

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

Connect float rods to float valves with the through hole

14 products

Inch-to-NPT Male-Female Hex Thread Adapters

Connect float balls, float rods, and valves

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

290 products

Metric-to-Metric Male Round Thread Adapters

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

1 product

Inch-to-Metric Male Hex Thread Adapters

Join inch and metric female-threaded parts

482 products

Metric-to-Metric Male Hex Thread Adapters

Join two female-threaded parts with dissimilar metric thread sizes

129 products

Inch-to-Metric Male Round Thread Adapters

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

4 products

Male Round Universal Thread Adapters with Through Hole

Air, liquids, wire, and other thin materials flow through the hole

4 products

Left-Hand to Right-Hand Male Thread Adapters

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

32 products

Female Thread Adapters

Inch-to-Inch Female Hex Thread Adapters

Join two male-threaded parts with dissimilar inch thread sizes

353 products

Inch-to-Metric Female Hex Thread Adapters

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

532 products

Metric-to-Metric Female Hex Thread Adapters

Join two male-threaded parts with dissimilar metric thread sizes

164 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

66 products

Thread Adapters for Pullers

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

8 products

Hex Drive Thread Adapters

Join coarse threads to fine threads using a hex key

27 products

Thread Adapters for Drum Openings

Convert drum openings with metric or BSPP threads to a 2 NPT pipe size

10 products

Other Products

Standoffs

Separate, position, or connect components in assemblies

1,599 products

Drill Rig Thread Adapters

Change thread sizes on bits to use them in drill rigs

1 product

Studs

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

82 products

Conduit and Cord Grip Thread Adapters

Connect to fittings and openings that have a different thread type

44 products

Probe Stylus Accessories

Add components that extend length, adapt threads, or hold multiple styli at once

4 products

Thermocouple and RTD Mounts

Join thermocouple connectors and probes that have different connection types

12 products

Electrical Connector Thread Adapters

Join two connectors that both have internal threads

6 products

Dowel Screws

Screw into holes to join two pieces of wood

13 products

Flap Wheel Adapters

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

2 products