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
4-40
4-48
5-40
6-32
8-32
10-24
10-32
12-24
1/4"-20
1/4"-28
5/16"-18
3/8"-16
1/2"-13
M3
M4
M5
M6
M8

	Flat Head Profile Flat Head Profile


Undercut	Standard

	Head Type Head Type


Flat	Oval

	Drive Style Drive Style


Phillips	Hex	Torx

Slotted	Drilled Spanner	Tamper- Resistant Hex

Tamper- Resistant Torx

	Length Length

	Material Material

	Finish Finish

	Head Height Head Height

	Countersink Angle Countersink Angle

	Head Diameter Head Diameter

	Drive Size Drive Size

	Tensile Strength Tensile Strength

	Thread Type Thread Type

UNC

UNF

Metric

	Thread Pitch Thread Pitch

	Thread Spacing Thread Spacing

Coarse

Fine

	Specifications Met Specifications Met

ASME

ASTM

DIN

Fed. Spec.

ISO

Mil. Spec.

NAS

	Thread Fit Thread Fit

Class 2A

Class 3A

Class 6g

	Screw Size Screw Size

	Hardness Hardness

	For Use In For Use In

Sheet Metal

Steel

	Color Color

	Black
	Off-White

	Tapping Method Tapping Method


Thread Cutting	Thread Forming

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400 Products

Flat Head Screws

Phillips Flat Head Screws

Hex Drive Flat Head Screws

Torx Flat Head Screws

A Torx drive has more points of contact than other drives—allowing you to tighten the screw without damaging the recess.

Slotted Flat Head Screws

Sealing Flat Head Screws

A rubber O-ring prevents leaks and seals out contaminants.

Tamper-Resistant Flat Head Screws

Difficult to remove without special tools, use these screws in public spaces to reduce the risk of theft and tampering.

Tapping, Wood, and Drywall Screws

Flat Head Drilling Screws for Metal

The flat head provides a flush finish in countersunk holes.

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