1/4"-28 Nuts | McMaster-Carr

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System of Measurement

Thread Size

Material

Nut Type

Hex Nut Profile

Finish

Cadmium Yellow-Chromate Plated

Zinc Yellow-Chromate Plated

Width

Height

Thread Direction

Fastener Strength Grade/Class

Thread Type

Thread Spacing

Locking Type

Specifications Met

Federal Specification

Performance

Fastener Strength Rating

Thread Fit

Unified Standard Class 1B

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Military Specification

For Smooth Rivet Nut Thread Size

DFARS Specialty Metals

RoHS

Compliant with Exemptions

Flange Diameter

Drive Style

Export Control Classification Number (ECCN)

REACH

Length

667 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

Press-Fit Nuts

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

7 products

Weld Nuts

Weld to metal surfaces to add permanent threads

12 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

86 products

Thread Adapters

Join threads of a different type, size, and gender

191 products

Binding Barrels and Screws

Thread together for a low-profile fastener

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

1 product

Power Transmission

Lead Screws and Nuts

Components travel along a screw with broad, square threads to clamp and lift heavy loads

17 products

Building and Machinery Hardware

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

2 products

Material Handling

Turnbuckle Bodies

Pair with end fittings to create a custom turnbuckle

1 product