Security Screw Sockets | McMaster-Carr

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81 Products

Tri-Groove Sockets

Square Drive

Hex Drive

Grip the indentations around the outside of tri-groove fasteners. These sockets are for hand-driven use only.

Hex-drive sockets are specialty sockets that require the use of another 1" socket when used with a ratchet wrench.

1/4" Square Drive
Drive Size	Overall Lg.	OD	For Fastener Type	For Screw Size (Head Dia.)	For Nut Size (Dia.)	Material		Each
No. 10	1"	31/64"	Screws and Nuts	1/4", No. 10, No. 12 Standard (0.334") 1/4" Countersunk (0.492")	No. 6, No. 8 (0.406")	Black-Oxide Steel	0000000	000000
No. 4	1"	31/64"	Screws	No. 4 Standard (0.13") No. 6 Countersunk (0.268")	__	Black-Oxide Steel	0000000	00000
No. 6	1"	31/64"	Screws	No. 6, No. 8 Standard (0.208") No. 8, No. 10 Countersunk (0.372")	__	Black-Oxide Steel	0000000	00000
3/8" Square Drive
No. 20	1"	47/64"	Screws and Nuts	5/16" Standard (0.585")	1/4", No. 10 (0.661")	Black-Oxide Steel	0000000	00000
No. 30	1 1/4"	31/32"	Nuts	__	3/8", 5/16" (0.864")	Black-Oxide Steel	0000000	00000
No. 40	1 1/4"	31/32"	Nuts	__	1/2" (0.93")	Black-Oxide Steel	00000000	00000
1/2" Square Drive
1/2"	1 1/4"	1 1/4"	Nuts	__	1/2", M12, M14 (12mm, 0.5", 14mm)	Steel	0000000	00000
1" Hex Drive
1"	2"	1 5/8"	Nuts	__	M16, M20 (0.625", 16mm, 18mm, 0.75", 20mm)	Black-Oxide Steel	0000000	000000

5-Point Sockets

These sockets fit the nuts found on water and gas valves. Use with hand-driven tools only.

3/8" Square Drive
Drive Size	Overall Lg.	OD	Material	Finish		Each
13/16"	1 1/16"	1 1/8"	Steel	Black Oxide	000000	000000
1/2" Square Drive
13/16"	2"	1 1/8"	Steel	Black Oxide	0000000	00000

Tamper-Resistant Torx Bit Sockets

These sockets are also known as pin-in-Torx bits.

For technical drawings and 3-D models, click on a part number.

1/4" Square Drive
Drive Size	Overall Lg.	Material	Bit Replaceable		Each
T7	1 9/16"	Chrome-Plated Steel	No	00000000	000000
T8	1 9/16"	Chrome-Plated Steel	No	00000000	00000
T10	1 9/16"	Chrome-Plated Steel	No	00000000	00000
T15	1 9/16"	Chrome-Plated Steel	No	00000000	00000
T20	1 9/16"	Chrome-Plated Steel	No	00000000	00000
T25	1 9/16"	Chrome-Plated Steel	No	00000000	00000
T27	1 9/16"	Chrome-Plated Steel	No	00000000	00000
T30	1 9/16"	Chrome-Plated Steel	No	00000000	00000
3/8" Square Drive
T40	1 7/8"	Chrome-Plated Steel	No	00000000	00000
T45	1 7/8"	Chrome-Plated Steel	No	00000000	00000
T50	1 7/8"	Chrome-Plated Steel	No	00000000	00000
T55	2"	Chrome-Plated Steel	No	00000000	00000
1/2" Square Drive
T60	2 1/2"	Chrome-Plated Steel	No	00000000	00000

Tamper-Resistant Hex Bit Sockets

These sockets are also known as pin-in-hex or pin-in-socket bits.

For technical drawings and 3-D models, click on a part number.

Sockets						Replacement Bits
Drive Size	Overall Lg.	Material	Bit Replaceable		Each		Each
Inch
3/8" Square Drive
5/64"	1 1/2"	Chrome-Plated Steel	Yes	0000000	00000	0000000	00000
3/32"	1 1/2"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
7/64"	1 1/2"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
1/8"	1 1/2"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
9/64"	1 1/2"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
5/32"	1 1/2"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
3/16"	1 1/2"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
7/32"	1 1/2"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
1/4"	1 1/2"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
Metric
3/8" Square Drive
2 mm	1 3/4"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
2.5 mm	1 3/4"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
3 mm	1 3/4"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
4 mm	1 3/4"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
5 mm	1 3/4"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
6 mm	1 3/4"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000
8 mm	1 3/4"	Chrome-Plated Steel	Yes	0000000	0000	0000000	0000

Tamper-Resistant Torx-Plus Bit Sockets

An opening at the tip of these sockets fits around the security pin, allowing you to drive tamper-resistant Torx Plus screws. With larger lobes than regular tamper-resistant Torx bit sockets, they withstand higher torque. Use with hand-drive tools only.

For technical drawings and 3-D models, click on a part number.

Sockets						Replacement Bits
Drive Size	Overall Lg.	Material	Bit Replaceable		Each		Each
1/4" Square Drive
IPR10	1 1/2"	Chrome-Plated Steel	Yes	00000000	000000	00000000	00000
IPR15	1 1/2"	Chrome-Plated Steel	Yes	00000000	00000	00000000	0000
IPR20	1 1/2"	Chrome-Plated Steel	Yes	00000000	00000	00000000	0000
IPR25	1 1/2"	Chrome-Plated Steel	Yes	00000000	00000	00000000	0000
IPR27	1 1/2"	Chrome-Plated Steel	Yes	00000000	00000	00000000	0000
IPR30	1 1/2"	Chrome-Plated Steel	Yes	00000000	00000	00000000	0000
3/8" Square Drive
IPR40	1 7/8"	Chrome-Plated Steel	Yes	00000000	00000	00000000	0000
IPR45	1 7/8"	Chrome-Plated Steel	Yes	00000000	00000	00000000	0000
IPR50	1 7/8"	Chrome-Plated Steel	Yes	00000000	00000	00000000	0000
IPR55	2 1/8"	Chrome-Plated Steel	Yes	00000000	00000	00000000	0000

5-Point Impact Sockets

Turn 5-point tamper-resistant nuts and bolts often found on water and gas valves. The walls of the sockets are thicker and more flexible than standard sockets, so they can handle the high torque and force of impact tools without cracking.

For technical drawings and 3-D models, click on a part number.

	Clearance Depth
Drive Size	Nut	Bolt	Overall Lg.	OD	Material	Finish		Each
1/2" Square Drive
13/16"	13/16"	13/16"	2"	1 9/32"	Steel	Black Oxide	000000000	000000

Tamper-Resistant Torx Bit Socket Sets

These sockets are also known as pin-in-Torx bits.

3/8" Square Drive
No. of Pieces	Includes	Overall Lg.	Material		Each
7	Bit Sockets: T25, T27 (1 27/32" O'all Lg.) Bit Sockets: T30, T40, T45, T47, T50 (1 31/32" O'all Lg.)	1 27/32"-1 31/32"	Chrome-Plated Steel	00000000	000000
1/4", 3/8", 1/2" Square Drive
13	1/4" Square Drive Size Bit Sockets: T7, T8, T10, T15, T20, T25, T27, T30 (1 9/16" O'all Lg.) 3/8" Square Drive Size Bit Sockets: T40, T45, T50 (1 7/8" O'all Lg.); T55 (2" O'all Lg.) 1/2" Square Drive Size Bit Socket: T60 (2 1/2" O'all Lg.)	1 9/16"-2 1/2"	Chrome-Plated Steel	00000000	000000

Tamper-Resistant Hex Bit Socket Sets

These sockets are also known as pin-in-hex or pin-in-socket bits.

For technical drawings and 3-D models, click on a part number.

3/8" Square Drive
No. of Pieces	Includes	Overall Lg.	Material		Each
7	Bit Sockets: 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm (1 5/8" O'all Lg.)	1 3/4"	Chrome-Plated Steel	0000000	000000
9	Bit Sockets: 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4" (1 1/2" O'all Lg.)	1 1/2"	Chrome-Plated Steel	0000000	00000

Tri-Groove Socket Sets

Grip the indentations around the outside of tri-groove fasteners.

1/4" Square Drive—Steel
No. of Pieces	Components Included	Includes	Finish		Each
4	3 Sockets 1 Drive Tool	Standard Socket: No. 4 (For No. 4 Standard Screws and No. 6 Countersunk Screws) Standard Socket: No. 6 (For Nos. 6 and 8 Standard Screws and Nos. 8 and 10 Countersunk Screws) Standard Socket: No. 10 (For Nos. 10, 12, and 1/4" Standard Screws; 1/4" Countersunk Screws; and Nos. 6 and 8 Nuts) 8" Long Socket Screwdiver Handle	Black Oxide	0000000	000000