1/4"-28 Fasteners | McMaster-Carr

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System of Measurement

Thread Size

Length

Material

Fastener Head Type

Threading

Threaded on Both Ends

Drive Style

Tamper-Resistant Torx

Finish

Cadmium Yellow-Chromate Plated

Chrome Plated

Corrosion-Resistant Coated

Zinc Yellow-Chromate Plated

Thread Spacing

Thread Type

UN/UNF (SAE Straight)

Socket Head Profile

Specifications Met

Federal Specification

Tensile Strength

20,000 psi to 29,999 psi

30,000 psi to 99,999 psi

100,000 psi or greater

Not Rated

Thread Direction

Left Hand

Right Hand

Right Hand and Left Hand

Head Diameter

Thread Fit

Unified Standard Class 1A

Unified Standard Class 1B

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Fastener Strength Grade/Class

Head Height

Tip Type

DFARS Specialty Metals

Drive Size

RoHS

Compliant with Exemptions

Not Compliant

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

Yes

Export Control Classification Number (ECCN)

REACH

Hardness

1,990 Products

Fastening and Joining

Socket Head Screws

With a deeper drive than flat and rounded head screws, these withstand more torque for a tighter hold

168 products

Hex Head Screws

Used with nuts to create a stronger joint than flat and rounded screws

177 products

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

173 products

Flat Head Screws

Fit in countersunk holes for a flush finish that won't snag on surrounding parts

107 products

12-Point Screws

12 contact points handle more torque than a hex head while a flange eliminates the need for a washer

19 products

Shoulder Screws

Rotate parts around the cylinder under the head to guide and align them during installation

144 products

Set Screws

Exert pressure at the tip to hold parts in place, unlike screws that hold material together with threads

161 products

Tapping Screws

Fasten a range of materials together without needing to tap the hole first

5 products

Thumb Screws

Tighten and loosen by hand without the need for tools

37 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

14 products

Hanger Bolts

Suspend pipe and other fixtures with wire or cable ties

4 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

43 products

Hex Nuts

Handle most general fastening needs

57 products

Flange Nuts

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

21 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

Coupling Nuts

Connect and extend threaded rods

17 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

Square Nuts

Flat sides won’t spin in channels and square holes

3 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

Rivet Nuts

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

7 products

Threaded Inserts

Create new threads or repair stripped threads

109 products

Press-Fit Nuts

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

7 products

Adhesive-Mount Nuts

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

8 products

Weld Nuts

Weld to metal surfaces to add permanent threads

12 products

Threaded Rods

Anchor, connect, or hang components in a wide variety of applications

123 products

Binding Barrel Posts

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

5 products

Thread Adapters

Join threads of a different type, size, and gender

191 products

Taper Pins

Fit snugly into tapered holes to secure, position, and align components

32 products

Single-End Studs

Use the unthreaded end as a pivot point, hinge, shaft, or locator pin

11 products

Rivet Tools

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

Threaded Insert Installation Tools

Install helical, key-locking, slotted-drive, and other threaded inserts

43 products

Power Transmission

Lead Screw Collars

Position components and limit travel along a lead screw

17 products

Rod Ends

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

9 products

Connecting Rods

Use with rod ends and swivel joints to link components in push/pull assemblies

63 products

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

3 products

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

2 products

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

1 product

Fabricating and Machining

Lathe Tool Insert Holder Replacement Parts

Replace clamps, screws, shims, and other parts in lathe tool insert holders

8 products

Fixture Clamps

Secure your workpiece to a fixture table so it won't move during machining

7 products

Material Handling

Eyebolts

Route rope through the loop or attach hooks and shackles for lifting

4 products

Turnbuckles

Twist the body or end fittings to adjust the length and tension of attached rope and chain

21 products