1/2"-20 Screws | McMaster-Carr

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	System of Measurement System of Measurement

	Thread Size Thread Size	Show

	Thread Size Thread Size	Hide

	Head Type Head Type


Socket	Rounded

Hex	Flat

Headless	12-Point

Tee

	Threading Threading

Partially Threaded

Threaded on Both Ends

Threaded on One End

	Material Material

Stainless
Steel

	Finish Finish

Black Phosphate

Zinc Yellow-Chromate Plated

Zinc-Aluminum Coated

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Drive Style Drive Style


Hex	External Hex

Slotted	External 12- Point

	Thread Direction Thread Direction

Right Hand and Left Hand

	Thread Spacing Thread Spacing

	Head Width Head Width

	Head Height Head Height

	Tensile Strength Tensile Strength

	Specifications Met Specifications Met

AN

ASTM

DIN

Fed. Spec.

IFI

ISO

Mil. Spec.

SAE

	Thread Type Thread Type

	Thread Fit Thread Fit

	Socket Head Profile Socket Head Profile

	Standard

	Hardness Hardness

	Head Diameter Head Diameter

	Drive Size Drive Size

	Minimum Thread Length Minimum Thread Length

	Tip Type Tip Type


Cup	Flat

Extended	Cone

Soft	Oval

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819 Products

Fasteners

Socket Head Screws

With a deeper drive than flat and rounded head screws, socket head screws withstand more torque for a tighter hold. Install in a counterbored hole or above the surface.

Rounded Head Screws

testString

A domed head sits above the surface of your material. Includes screws such as pan, button, binding, and truss head screws.

Hex Head Screws

Hex head screws are easy to install with a wrench for a secure hold. Use them with a nut or in tapped holes.

Flat Head Screws

Flat and oval head screws are angled under the head to fit in countersunk holes.

Set Screws

Set Screws

Unlike screws that hold materials together with threads, set screws exert pressure at the tip to hold objects in place.

12-Point Screws

12-Point Screws

The head makes 12 points of contact with a wrench to handle more torque than a socket head or hex head screw.

T-Bolts

The large T-shaped head provides a secure grip for steady tightening. It can also function as a handle for work-holding or an attachment point for straps and clamps.

Threaded Rods and Studs

Thread Adapters

Adapters connect two female threads, two male threads, or a male thread and a female thread.

Slotted Ball-Nose Spring Plungers

Install these spring plungers with a screwdriver—they're slotted on one or both ends.

Other Screws

Threaded-Stud Knobs

Threaded-Stud Knobs

Mount these knobs into a threaded hole. They provide a secure grip to position, tighten, and hold fixtures, equipment, and machinery.

Ultra-Precision Lead Screws and Nuts

Also known as single-start and self-locking lead screws and nuts, these have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won't unexpectedly move when the lead screw is at rest.

Eyebolts—For Lifting

Also known as machinery eyebolts.

Wheel Axles

Replace worn or broken caster axles.

Connecting Rods

Build linkages for push/pull and oscillating movement by fastening rod ends, swivel joints, or ball joint linkages to the ends of these rods.

Center-Locating Punches
for Threaded Holes

Also known as transfer screws, these punches have a uniform shoulder height so you can quickly transfer multiple hole locations at once.

Self-Aligning Center-Locating
Punches for Threaded Holes

Self-Aligning Center-Locating Punches for Threaded Holes

Also known as transfer screws, these punches have a uniform shoulder height so you can quickly transfer multiple hole locations at once.

Forcing Screws for Pullers

Forcing Screws for Pullers

Make your old puller work like new by replacing worn forcing screws.

Threaded Adapters for Pullers

Use adapters on the ends of forcing screws and face-grip puller legs when pulling shafts, bearing caps, and pinions.

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Shoulder Screws

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