1/4"-28 Nuts | McMaster-Carr

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System of Measurement

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Material

Nut Type

Hex Nut Profile

Finish

Cadmium Yellow-Chromate Plated

Zinc Yellow-Chromate Plated

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Thread Type

Thread Direction

Thread Spacing

Locking Type

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Unified Standard Class 1B

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Performance

Specifications Met

Federal Specification

UL 50

Fastener Strength Rating

DFARS Specialty Metals

Compliant

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For Smooth Rivet Nut Thread Size

Military Specification

Thread Pitch

RoHS

Compliant with Exemptions

Drive Style

REACH

Export Control Classification Number (ECCN)

1C998

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

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661 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

57 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

43 products

Flange Nuts

The flange distributes pressure, so you don't need a washer

21 products

Coupling Nuts

Connect and extend threaded rods

17 products

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

11 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

13 products

Square Nuts

Flat sides won’t spin in channels and square holes

3 products

Socket Nuts

Install in recessed holes and tight spots where a wrench won’t fit; also known as Allen nuts

2 products

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

2 products

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

3 products

Rivet-Mount Nuts

Add threads in hard-to-reach areas and materials that are too thin to be tapped

8 products

Weld Nuts

Weld to metal surfaces to add permanent threads

12 products

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

7 products

Rivet Nuts

Add threads to thin panels with access from only one side; also known as blind inserts

7 products

Adhesive-Mount Nuts

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

8 products

Threaded Inserts

Create new threads or repair stripped threads

109 products

Thread Adapters

Join threads of a different type, size, and gender

191 products

Binding Barrel Posts

Pair with a cap or screw to create a custom low-profile fastener

Install and remove blind, solid, hollow, and other types of rivets

1 product

Power Transmission

Lead Screw Collars

Position components and limit travel along a lead screw

17 products

Material Handling

Turnbuckle Bodies

Pair with end fittings to create a custom turnbuckle

1 product

Building and Machinery Hardware

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

2 products