McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

0-80
1-64
1-72
2-56
2-64
3-48
3-56
4-40
4-48
5-40
6-32
6-40
8-32
8-36
10-24
10-32
12-24
1/4"-20
1/4"-28
5/16"-18
5/16"-24
3/8"-16
1/2"-13
M1.6
M1.7
M2
M2.5
M2.6
M3
M3.5
M4
M5
M6
M8
M10

	Material Material

	Finish Finish

Black Epoxy Coated

Black Oxide

Black Phosphate

Black Ultra-Corrosion-
Resistant Coated

Black Zinc Plated

Blue Ultra-Corrosion-
Resistant Coated

Silver Ultra-Corrosion-
Resistant Coated

Ultra-Corrosion-
Resistant Coated

Zinc Plated

Zinc Yellow-Chromate
Plated

Zinc-Aluminum Coated

	Length Length

	Head Type Head Type


Socket	Rounded

Hex	Flat

Headless	Thumb

Oval

	Drive Style Drive Style	Show

Phillips

	Drive Style Drive Style	Hide

	Rounded Head Style Rounded Head Style


Pan	Truss

Round	Cheese

Fillister	Pancake

	Head Diameter Head Diameter

	Screw Size Screw Size

	Threading Threading

	Fully Threaded
	Partially Threaded

	Tip Type Tip Type


Blunt	Drilling

Pointed

	Head Height Head Height

	Flat Head Profile Flat Head Profile

Standard

Undercut

Narrow

	Thread Direction Thread Direction

	Right Hand

	For Use In For Use In

	Countersink Angle Countersink Angle

	Drive Size Drive Size

	Specifications Met Specifications Met

ASME

DIN

Fed. Spec.

ISO

JIS

Mil. Spec.

NAS

	Thread Type Thread Type

Metric

UNC

UNF

	Thread Spacing Thread Spacing

Coarse

Fine

	Rounded Head Profile Rounded Head Profile

	Thread Fit Thread Fit

8,524 Products

Screws and Bolts

Rounded Head Screws

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.

Tapping, Wood, and Drywall Screws

While other screws and bolts require holes with threads, tapping screws create their own threads.

Captive Panel Screws

Secure panels and enclosures while allowing access. Screws become part of the panel when installed, so they won't fall out and get lost.

Other Fasteners

Anchors

Fastener Assortments

Fabric Snaps with Threaded Stud

Use these male snap halves when you need to fasten a fabric snap to a solid surface. A tool is required for installation.

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