Tamper-Resistant Screws | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Length Length

	Drive Style Drive Style

Tamper-Resistant Torx

Tamper-Resistant Torx
Plus

External Pentagon

	Size Size

	Head Type Head Type


Rounded	Flat

Pentagon

	Material Material

Stainless Steel

Steel

	Finish Finish

Passivated

Black Oxide

Zinc Plated

	Rounded Head Style Rounded Head Style


Button	Pan

Round	Truss

	Threading Threading

	Fully Threaded
	Partially Threaded

	Head Diameter Head Diameter

	Head Height Head Height

	Thread Type Thread Type

UNC

UNF

Metric

	Thread Pitch Thread Pitch

	Thread Spacing Thread Spacing

Coarse

Fine

	Tensile Strength Tensile Strength

	Thread Fit Thread Fit

Class 2A

Class 3A

Class 6g

	Hardness Hardness

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Specifications Met Specifications Met

ASME

ASTM

ISO

	Flat Head Profile Flat Head Profile


Standard	Undercut

	Rounded Head Profile Rounded Head Profile

Standard

Wide

High

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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About Rounded Head Screws

Stainless Steel Tamper-Resistant
Button Head Torx Screws

Stainless steel screws have excellent corrosion resistance in most environments.

Alloy Steel Tamper-Resistant Button Head Torx Screws

Made from alloy steel, these screws are nearly twice as strong as stainless steel button head screws.

Tamper-Resistant Drilled
Spanner Rounded Head Screws

Tamper-Resistant Hex Drive Rounded Head Screws

Tamper-Resistant One-Way Rounded Head Screws

The S-shaped drive can be installed with a standard slotted driver, but requires a special tool for removal.

Tamper-Resistant Tri-Groove Rounded Head Screws

Difficult to remove without special tools, these screws have three grooves.

Tamper-Resistant Asymmetrical
Drive Rounded Head Screws

These screws have a unique drive that is sold only by McMaster-Carr.

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.

Pentagon Head Screws

The five-sided head provides tamper resistance by making these screws difficult to remove without special tools. Also known as penta-bolts and 5-point screws.