Tamper-Resistant Cap Screws

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	Drive Style Drive Style

Tamper-Resistant Torx

Tamper-Resistant Torx
Plus

Tri-Groove

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Length Length

	Size Size

	Head Type Head Type


Flat	Rounded

Pentagon

	Material Material

Steel

Stainless Steel

	Finish Finish

Black Oxide

Passivated

Zinc Plated

	Rounded Head Style Rounded Head Style


Button	Pan

Truss	Round

	Threading Threading

	Fully Threaded
	Partially Threaded

	Head Diameter Head Diameter

	Head Height Head Height

	Thread Direction Thread Direction

	Right Hand

	Thread Type Thread Type

UNC

Metric

UNF

	Thread Pitch Thread Pitch

	Thread Spacing Thread Spacing

Coarse

Fine

	Tensile Strength Tensile Strength

60,000 to 99,999 psi

100,000 psi or greater

	Hardness Hardness

	Thread Fit Thread Fit

Class 2A

Class 3A

Class 6g

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

RoHS Compliant

	Flat Head Profile Flat Head Profile


Standard	Undercut

	Specifications Met Specifications Met

ASME

ASTM

ISO

	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

Tamper-Resistant Torx Flat Head Screws

With a tamper-resistant Torx or Torx Plus drive (also known as a pin-in Torx or Torx Plus drive), these screws are difficult to remove without special tools.

Metric Tamper-Resistant Torx Flat Head Screws

With a tamper-resistant Torx drive (also known as a pin-in Torx drive), these metric screws are difficult to remove without special tools.

Metric Sealing Tamper-Resistant Torx Flat Head Screws

With an O-ring under the head, these metric screws seal out leaks and contaminants while also preventing unwanted removal.

Sealing Tamper-Resistant Torx Flat Head Screws

Prevent unwanted removal, leaks, and contamination with these sealing Torx screws.

Tamper-Resistant Hex Drive Flat Head Screws

A tamper-resistant hex drive (also known as pin-in hex drive) makes these screws difficult to remove without special tools.

Metric Tamper-Resistant Hex Drive Flat Head Screws

With a tamper-resistant hex drive (also known as a pin-in hex drive), these metric screws are difficult to remove without special tools.

Tamper-Resistant Drilled Spanner Flat Head Screws

These screws have a tamper-resistant drilled spanner drive, which makes them difficult to remove without special tools.

Metric Tamper-Resistant Drilled
Spanner Flat Head Screws

These metric screws have a tamper-resistant drilled spanner drive, making them difficult to remove without special tools.

Tamper-Resistant Rounded Head Screws

Stainless Steel Tamper-Resistant
Button Head Torx Screws

These 18-8 stainless steel button head screws have good chemical resistance and may be mildly magnetic. The tamper-resistant Torx drive (also known as a pin-in Torx drive) makes them difficult to remove without special tools.

Metric Stainless Steel Tamper-Resistant
Button Head Torx Screws

Made from 18-8 stainless steel, these metric button head screws have good chemical resistance and may be mildly magnetic. The tamper-resistant Torx drive (also known as a pin-in Torx drive) makes them difficult to remove without special tools.

Sealing Stainless Steel Tamper-Resistant
Button Head Torx Screws

To prevent unwanted removal, these screws have a tamper-resistant Torx drive—also known as a pin-in Torx drive—that makes them difficult to unscrew without special tools. An O-ring under the head blocks leaks and seals out dust and dirt.

Metric Sealing Stainless Steel
Tamper-Resistant Button Head Torx Screws

To prevent unwanted removal, these metric screws have a tamper-resistant Torx drive—also known as a pin-in Torx drive—that makes them difficult to unscrew without special tools. An O-ring under the head blocks leaks and seals out dust and dirt.

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. Their tamper-resistant Torx drive (also known as a pin-in Torx drive) makes them difficult to remove without special tools.

Metric Alloy Steel Tamper-Resistant
Button Head Torx Screws

Nearly twice as strong as stainless steel button head screws, these metric screws are made from alloy steel. Their tamper-resistant Torx drive (also known as a pin-in Torx drive) makes them difficult to remove without special tools.

Stainless Steel Tamper-Resistant
Button Head Hex Drive Screws

These 18-8 stainless steel button head screws have good chemical resistance and may be mildly magnetic. The tamper-resistant hex drive (also known as a pin-in hex drive) makes them difficult to remove without special tools.

Metric Stainless Steel Tamper-Resistant
Button Head Hex Drive Screws

Made from 18-8 stainless steel, these metric button head screws have good chemical resistance and may be mildly magnetic. The tamper-resistant hex drive (also known as a pin-in hex drive) makes them difficult to remove without special tools.

Alloy Steel Tamper-Resistant
Button Head Hex Drive Screws

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

Metric Tamper-Resistant Drilled
Spanner Pan Head Screws

These metric screws have a drilled spanner drive, making them difficult to remove without special tools. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Tamper-Resistant Drilled Spanner Pan Head Screws

A tamper-resistant drilled spanner drive makes these screws difficult to remove without special tools. They're 18-8 stainless steel for good chemical resistance and may be mildly magnetic.

Extra-Wide Tamper-Resistant
Drilled Spanner Truss Head Screws

The extra-wide head distributes holding pressure to reduce the likelihood of crushing thin materials.

Tamper-Resistant Tri-Groove Rounded Head Screws

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

Tamper-Resistant Asymmetrical
Drive Button Head Screws

These button head screws have a unique drive that is sold only by McMaster-Carr, making them difficult to remove without a special driver bit. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic.

Stainless Steel Tamper-Resistant
One-Way Round Head Screws

Stainless steel screws have excellent corrosion resistance in most environments.

Steel Tamper-Resistant One-Way Round Head Screws

A zinc plating provides mild corrosion resistance.

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.