1/2"-20 Fasteners | McMaster-Carr

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System of Measurement

Thread Size

Length

Material

Stainless Steel

Threading

Partially Threaded

Threaded on Both Ends

Threaded on One End

Fastener Head Type

Finish

Cadmium Yellow-Chromate Plated

Dry Film Lubricated

Nickel Chrome Plated

Phosphate Coated

Zinc Flake Coated

Zinc Yellow-Chromate Plated

Fastener Strength Grade/Class

Thread Spacing

Thread Direction

Right Hand and Left Hand

Thread Type

UN/UNF (SAE 45°)

Drive Style

External 12-Point

Tensile Strength

Less than 10,000 psi

30,000 psi to 99,999 psi

100,000 psi or greater

Thread Fit

Metric Class 6g

Metric Class 6H

Unified Standard Class 1A

Unified Standard Class 2A

Unified Standard Class 2B

Unified Standard Class 3A

Unified Standard Class 3B

Head Width

Specifications Met

Federal Specification

Nut Type

Tamper Resistant

Head Height

Thread Length

DFARS Specialty Metals

Export Control Classification Number (ECCN)

Grip Length

RoHS

Compliant with Exemptions

REACH

Head Diameter

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1,257 Products

Fastening and Joining

Hex Head Screws

Hex Head Screws

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

Socket Head Screws

Socket Head Screws

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

Flat Head Screws

Flat Head Screws

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

Rounded Head Screws

Rounded Head Screws

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

12-Point Screws

12-Point Screws

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

Set Screws

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

Shoulder Screws

Shoulder Screws

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

T-Bolts

Turn by hand for easy fastening, use as a handle, or attach as a point for straps and clamps

Hex Nuts

Handle most general fastening needs

Locknuts

Hold fasteners in place to prevent loosening from vibration

Cap Nuts

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

Coupling Nuts

Connect and extend threaded rods

Flange Nuts

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

Tamper-Resistant Nuts

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

Lug Nuts

Secure pneumatic wheels to axles

Easy to tighten and loosen by hand for making frequent adjustments

Socket Nuts

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

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

Standoffs

Separate, position, or connect components in assemblies

Threaded Inserts

Threaded Inserts

Create new threads or repair stripped threads

Press-Fit Nuts

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

Push Nuts

Press onto threads for a light duty hold that’s faster to install than typical nuts

Weld Nuts

Weld to metal surfaces to add permanent threads

Thread Adapters

Thread Adapters

Join threads of a different type, size, and gender

Threaded Rods

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

Single-End Studs

Single-End Studs

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

Taper Pins

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

Rivet Nut Tools

Rivet Nut Tools

Install rivet nuts

Power Transmission

Rod Ends

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

Connecting Rods

Connecting Rods

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

Shock Absorber Mounting Nuts

Shock Absorber Mounting Nuts

Secure shock absorbers after threading them into mounting blocks

Precision Lead Screws and Nuts

Precision Lead Screws and Nuts

Pair with a motor for accurate starts and stops in automated motion and positioning applications

Building and Machinery Hardware

Knobs

Position, tighten, and secure fixtures and equipment

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

Material Handling

Eyebolts

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

Turnbuckles

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

Fabricating and Machining

Drill Bushings

Fit in holes to guide drill bits and other cutting tools for precise and repeatable holes and cuts

Fixture Clamps

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

Fluid Handling

Tube and Tube Fittings

Tube and Tube Fittings

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

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)