5/16"-24 Fasteners | McMaster-Carr

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System of Measurement

Thread Size

Length

Material

Threading

Threaded on Both Ends

Fastener Head Type

Finish

Cadmium Yellow-Chromate Plated

Zinc Yellow-Chromate Plated

Drive Style

Thread Spacing

Thread Type

UN/UNF (SAE Straight)

Thread Direction

Right Hand and Left Hand

Fastener Strength Grade/Class

Tensile Strength

30,000 psi to 99,999 psi

100,000 psi or greater

Socket Head Profile

Thread Fit

Unified Standard Class 1A

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Specifications Met

DFARS Specialty Metals

Head Diameter

Head Height

RoHS

Compliant with Exemptions

Nut Type

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

Yes

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

Thread Length

Drive Size

1,443 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

94 products

Hex Head Screws

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

159 products

Rounded Head Screws

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

49 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

Flat Head Screws

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

43 products

Thumb Screws

Tighten and loosen by hand without the need for tools

27 products

Shoulder Screws

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

85 products

Set Screws

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

112 products

Hex Nuts

Handle most general fastening needs

55 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

42 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

10 products

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

3 products

Coupling Nuts

Connect and extend threaded rods

17 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

9 products

Socket Nuts

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

2 products

Split Nuts

Swivel to attach at any point on a threaded rod for quick installation

1 product

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

1 product

Square Nuts

Flat sides won’t spin in channels and square holes

1 product

Rivet-Mount Nuts

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

4 products

Threaded Inserts

Create new threads or repair stripped threads

94 products

Weld Nuts

Weld to metal surfaces to add permanent threads

17 products

Rivet Nuts

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

8 products

Press-Fit Nuts

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

3 products

Thread Adapters

Join threads of a different type, size, and gender

196 products

Threaded Rods

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

95 products

Single-End Studs

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

13 products

Taper Pins

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

20 products

Threaded Insert Installation Tools

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

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

10 products

Connecting Rods

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

59 products

Rod Ends

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

7 products

End Supports for Ball Screws and Precision Lead Screws

Brace and secure the ends of ball screws and precision lead screws

2 products

Material Handling

Turnbuckles

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

15 products

Eyebolts

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

4 products

Fluid Handling

Tube Fitting Nuts

Tighten to create a strong seal between tube and tube fittings

7 products

Fabricating and Machining

Fixture Clamps

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

8 products

Toggle Clamps

Lock workpieces onto worktables or objects

1 product

Lathe Tool Insert Holder Clamp Screws

Replace the clamp screws on your lathe tool insert holder

4 products

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

3 products

Protective Plugs

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

1 product

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

2 products