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.

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.

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.

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.

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.

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

Stainless steel screws have excellent corrosion resistance in most environments.

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.

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

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

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

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

Also known as pin-in-hex, install and remove these screws with a tamper-resistant hex driver.

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

A tamper-resistant Torx driver is required for installation and removal. Also known as pin-in-Torx, these screws allow you to apply extra force with less slippage or damage to the recess.

Also known as pin-in-hex, install and remove these screws with a tamper-resistant hex driver.

A tamper-resistant Torx driver is required for installation and removal. Also known as pin-in-Torx, these screws allow you to apply extra force with less slippage or damage to the recess.

Install these binding barrels and screws with a standard slotted screwdriver. They require a special tool to remove.

The most tamper-resistant nuts we offer, these have a hex head that breaks away upon tightening, leaving a non-removable cone. Install with a standard wrench.

Difficult to grasp with standard hand tools, these metric nuts have sloped sides to reduce the risk of unwanted removal.

These nuts have serrations that dig into the material surface to resist loosening and are narrow to fit in tight spaces. Install with a serrated-edge driver.

Specify a message and starting number.

Specify a message and starting number.

These tags are stamped with "SEALED" and are numbered consecutively, starting with a random number.

These tags are stamped with "SEALED" and are numbered consecutively, starting with a random number.

Thread the thin wire on these tags through small holes and around oddly shaped items.

Create custom-length seal tags using locks and wire.

These tags are stamped with "SEALED" and are numbered consecutively, starting with a random number.

Get peace of mind when packaging high-value and confidential items—this tape indicates a package has been opened.