Pentagon Head Fasteners | McMaster-Carr

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	Head Type Head Type	Show

Pentagon

	Head Type Head Type	Hide

	System of Measurement System of Measurement

Inch

	Length Length

	Thread Size Thread Size

3/8"-16

1/2"-13

	Material Material

Stainless Steel

	Drive Style Drive Style

	External 5-Point

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

REACH Compliant

	Threading Threading

	Fully Threaded

	Head Height Head Height

5/16"

	Head Width Head Width

7/8"

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

RoHS Compliant

	Thread Spacing Thread Spacing

Coarse

	Thread Type Thread Type

UNC

	Thread Fit Thread Fit

Class 2A

	Thread Direction Thread Direction

	Right Hand

	Hardness Hardness

Rockwell B70

	Tensile Strength Tensile Strength

70,000 psi

	Drive Size Drive Size

17 Products

Pentagon Head Screws

The five-sided head provides tamper resistance by making these screws difficult to remove without special tools. Install or remove with 5-point sockets (sold separately). Also known as penta-bolts and 5-point screws, they are commonly used on water and gas valves. They are made from 18-8 stainless steel, which has good chemical resistance and may be mildly magnetic. Length is measured from under the head.

			Head
Lg.	Threading	Thread Spacing	Wd.	Ht.	Drive Size	Tensile Strength, psi		Each
18-8 Stainless Steel
3/8"-16
3/4"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	00000
1"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
1 1/2"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
2"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
2 1/4"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
2 1/2"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
3"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
4"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
1/2"-13
1 1/2"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
1 3/4"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
2"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
2 1/2"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
3"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
4"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000
4 1/2"	Fully Threaded	Coarse	7/8"	5/16"	13/16"	70,000	000000000	0000

3/8" Square Drive 5-Point Socket	000000	Each	000000
1/2" Square Drive 5-Point Socket	0000000	Each	00000