Tamper Resistant Fasteners

Tamper resistant fasteners (a.k.a. security fasteners) require special drivers or tools to install and remove. Some types cannot be removed once installed. Tamper resistant fasteners are commonly used in public spaces to reduce the risk of tampering or unauthorized removal.

Machine Screws

Screws with machine threads for use with a nut or in a tapped hole.

	Pan	Flat	Button	Round	Truss	Oval
Star pin-in		Star pin-in flat	Star pin-in button
Spanner (snake eyes)	Spanner pan	Spanner flat				Spanner oval
One-way				One-way round

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Sheet Metal Screws

Screws with large threads for use in sheet metal sometimes also used in plastic, fiberglass, or wood.

	Pan	Flat	Button	Round	Truss	Oval
Star pin-in		Star pin-in flat	Star pin-in button
Spanner (snake eyes)	Spanner pan	Spanner flat			Spanner truss	Spanner oval
One-way				One-way round

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Sex Bolt and Mating Screws

Sex bolts resemble machine screws, but with internal threads, and can be used with either specialized mating screws or standard machine screws. Also known as barrel nuts and Chicago bolts.

	Sex bolts	Mating screws
One way	One-way truss, serrated	One-way truss, serrated

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Driver Bits

	Standard 1/4" insert bit	5/16" shank insert bit	Power bit
Star pin-in	Star pin-in insert bits	Star pin-in 5/16" insert bits
Spanner (snake eyes)	Spanner insert bits
One way (slotted driver)	Slotted insert bits		Slotted power bits

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