4-40 Adapters | McMaster-Carr

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System of Measurement

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Specifications Met

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Zinc Yellow-Chromate Plated

Thread Fit

Metric Class 6g

Metric Class 6H

Unified Standard Class 1B

Unified Standard Class 2A

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Unified Standard Class 3B

DFARS Specialty Metals

RoHS

Compliant with Exemptions

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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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Hardness

Fitting Type

Nut Type

Thread Type

UN/UNF (SAE Straight)

Pitch

For Tap Thread Size

495 Products

Thread Adapters

Male-Female Thread Adapters

Inch-to-Inch Male-Female Hex Thread Adapters

Change thread size and spacing

41 products

Inch-to-Metric Male-Female Hex Thread Adapters

Change inch threads to metric

31 products

Male Thread Adapters

Inch-to-Inch Male Hex Thread Adapters

Join two female-threaded parts with dissimilar inch thread sizes

28 products

Inch-to-Metric Male Hex Thread Adapters

Join inch and metric female-threaded parts

19 products

Female Thread Adapters

Inch-to-Inch Female Hex Thread Adapters

Join two male-threaded parts with dissimilar inch thread sizes

28 products

Inch-to-Metric Female Hex Thread Adapters

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

20 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

1 product

Other Products

Standoffs

Separate, position, or connect components in assemblies

279 products

Threaded Inserts

Create new threads or repair stripped threads

13 products

Weld Nuts

Weld to metal surfaces to add permanent threads

6 products

Adhesive-Mount Nuts

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

10 products

Electrical Adapters

Change electrical connectors to another type, size, or gender

6 products

Torque Limiters

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

3 products

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

4 products