27 mm Screwdrivers | McMaster-Carr

Turn multiple shapes and sizes of fasteners with a single socket. Use these on hex, square, and other external-drive fasteners—even wing nuts. Place the socket over the nut or screw head and the 54 pins move to grip it securely. For use with hand-drive tools only.

Sockets


	Universal Socket

	Overall Lg.	OD	Material	Socket Shape		Each
1/2" Square Drive



	7/16"-1 1/4", 11 mm-32 mm	3 1/2"	1 11/16"	Chrome-Plated Steel	Universal	6021A111	000000

Hex Bit Sockets


	For Hex Drives

Drive hex fasteners with a ratchet or breaker bar for more torque and speed than a standard hex key. These chrome-plated steel sockets resist corrosion and wipe clean easily.

	Overall Lg.	Material	Bit Replaceable	For Drive Style		Each
1" Square Drive



	27	3 9/16"	Chrome-Plated Steel	No	Hex	1814N12	0000000

Sure Grip Wrench Head Sets


Wrench and Socket Extension Not Included

Grip more of your fastener head with these wrench heads. They have a hex or 12-point opening with more surface area than rounded wrench heads, so they make more contact with fasteners for a better hold. Also known as flare-nut crowfoot wrenches or line wrenches, they're often used with flared tube fittings as well as fuel and hydraulic lines. Connect them to a socket extension and ratchet wrench to turn fasteners where clearance is limited from both the top and side. You can also attach one directly to your ratchet wrench to convert it into an open-ended ratcheting wrench.

	Includes	Material	Wrench Opening Shape	Container Type		Each
3/8" Square Drive



	18	Wrench Heads: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 27 mm	Nickel-Plated Steel	Hex Sure Grip	Plastic Clip Rail	5311A111	0000000

12-Point Socket Sets

These tools handle the toughest industrial applications, provide the best grip on fasteners, and have a superior finish. The 12-point shape quickly positions on hex fasteners.

Sockets—Chrome-Plated Steel


	12-Point Socket

	Components Included	Includes	Container Type	Socket Shape	Drive Size, mm		Each
1/2" Square Drive



	15	15 Sockets	Standard: 10 mm, 13 mm, 14 mm, 15 mm, 17 mm, 18 mm, 19 mm, 20 mm, 22 mm, 23 mm, 24 mm, 26 mm, 27 mm, 30 mm, 32 mm	Plastic Clip Rail	12-Point	10, 13, 14, 15, 17, 18, 19, 20, 22, 23, 24, 26, 27, 30, 32	7256A21	0000000


	23	23 Sockets	Deep: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm Deep (cont.): 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm	Metal Clip Rail	12-Point	10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32	7874N105	000000
	24	24 Sockets	Standard: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm Standard (cont.): 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 36 mm	Metal Clip Rail	12-Point	10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 36	7874N104	000000


	3/4" Square Drive



			13	13 Sockets	Standard: 19 mm, 20 mm, 22 mm, 24 mm, 27 mm, 30 mm, 32 mm, 36 mm, 41 mm, 46 mm, 50 mm, 55 mm, 60 mm	Metal Clip Rail	12-Point	19, 20, 22, 24, 27, 30, 32, 36, 41, 46, 50, 55, 60	8362A11	000000

Socket Organizers

		Each
Foam Socket Organizer for 22 Piece 3/4" Square Drive Size Set	5243A22	0000000

Sockets with Drive Tools—Chrome-Plated Steel


	12-Point Socket

	Components Included	Includes	Container Type	Socket Shape	Drive Size, mm		Each
1/2" Square Drive



	20	17 Sockets 1 Extension 2 Drive Tools	Standard: 10 mm, 13 mm, 14 mm, 15 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 26 mm, 27 mm, 30 mm, 32 mm, 36 mm 10 3/8" Long Ratchet Wrench 15 1/2" Long Flex-Head Wrench Handle 5" Long Extension	Metal Case	12-Point	10, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 30, 32, 36	53195A74	0000000


	3/4" Square Drive



			30	24 Sockets 2 Drive Tools 3 Extensions Universal Joint	Standard: 19 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 35 mm; 36 mm, 38 mm, 41 mm Standard (cont.): 42 mm, 46 mm, 50 mm, 54 mm, 55 mm, 58 mm, 60 mm 17 1/2" Long Sliding-Head Wrench Handle 24" Long Ratchet Wrench 3 1/2" Long Extension 8" Long Extension, 16" Long Extension	Metal Case	12-Point	19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 35, 36, 38, 41, 42, 46, 50, 54, 55, 58, 60	7874N112	00000000

Socket Organizers

		Each
Foam Socket Organizer for 22 Piece 3/4" Square Drive Size Set	5243A22	0000000

12-Point Sockets

The 12-point shape quickly positions on hex fasteners. These sockets are for hand-driven use only.

Chrome-Plated Steel


Standard Clearance	Deep Clearance	12-Point Socket

					Standard Clearance			Deep Clearance
	Drive Size, mm	OD	Socket Shape	For Drive Style	Overall Lg.		Each	Overall Lg.		Each
1/2" Square Drive



		27	1 13/32"	12-Point	External 12-Point, External Hex	1 11/16"	7149A29	000000	—	———	0


		27	1 7/16"	12-Point	External 12-Point, External Hex	—	———	0	3 1/4"	7149A77	000000


		3/4" Square Drive



				27	1 37/64"	12-Point	External 12-Point, External Hex	2 1/16"	7312A28	00000	—	———	0

6-Point Impact Sockets

Achieve the best possible grip on hex fasteners and prevent rounding. These sockets are made to withstand the high torque and force of impact tools.

Standard Clearance


		6-Point Socket

3/4" Square Drive and 1" Square Drive—_3/4", 1", and 1 _1/2" square drive size sockets require a locking retainer. Use with an impact wrench that has a pin-style socket retainer, or use a socket retaining ring with tools that have a hole- or hole-and-ring style socket retainer.

	Sockets									Retaining Rings
		Clearance Dp.
	Drive Size, mm	Nut	Bolt	Compatible Retaining Ring ID	Material	Overall Lg.	Socket Shape		Each		Each
1/2" Square Drive



		27	1 1/4"	1 9/32"	—	Black-Oxide Steel	2"	6-Point	7205A31	000000	———	0


		3/4" Square Drive



				27	13/16"	1 1/8"	1 7/16"	Black-Oxide Steel	2 1/16"	6-Point	54175A79	00000	5552A36	00000


				1" Square Drive



						27	5/8"	1 21/32"	1 3/4"	Black-Oxide Steel	2 9/16"	6-Point	54155A974	00000	5550A68	0000

Deep Clearance


		6-Point Socket

	Sockets									Retaining Rings
		Clearance Dp.
	Drive Size, mm	Nut	Bolt	Compatible Retaining Ring ID	Material	Overall Lg.	Socket Shape		Each		Each
1/2" Square Drive



		27	25/32"	2 7/64"	—	Black-Oxide Steel	3 1/2"	6-Point	7205A68	000000	———	0


		3/4" Square Drive



				27	7/8"	2 1/4"	1 7/16"	Black-Oxide Steel	3 1/4"	6-Point	54175A7	00000	5552A36	00000


				1" Square Drive



						27	5/8"	2 3/4"	1 3/4"	Black-Oxide Steel	4"	6-Point	54155A45	00000	5550A68	0000

6-Point Sockets

The hex shape achieves the best possible grip on hex fasteners to prevent rounding their points. For use with hand-drive tools only.

Chrome-Plated Steel


Standard Clearance	Deep Clearance	6-Point Socket

						Standard Clearance			Deep Clearance
	Drive Size, mm	OD	Specs. Met	Socket Shape	For Drive Style	Overall Lg.		Each	Overall Lg.		Each
1/2" Square Drive



		27	1 13/32"	ASME B107.110, SAE AS955	6-Point	External Hex	1 11/16"	7149A82	000000	—	———	0


		27	1 7/16"	ASME B107.110	6-Point	External Hex	—	———	0	3"	7149A154	000000


		3/4" Square Drive



				27	1 1/2"	DIN 3124	6-Point	External Hex	—	———	0	3 1/2"	5543A206	00000

Changeable-Head Torque Wrenches

Change heads to use these tools as an open-end, box, square drive, or hex-key wrench. The handle and head combination you choose may have different maximum torque values. Do not exceed the lower value. The handles come with a calibration certificate, which includes test measurements that confirm accuracy.

You can tighten fasteners that require less torque than the values listed, but the accuracy ratings apply only within the specified range.

Open End Heads

Hex

Opening—Nonratcheting

	Max. Torque	Opening Angle	Color		Each
Hex Opening—Nonratcheting



	27	2,248 in·lbf	15°	Black	5347A196	000000

Economy 6-Point Socket Sets

Suitable for occasional maintenance work, these sets are imported. The hex shape grips hex fasteners and prevents rounding.

Sockets—Chrome-Plated Steel


Metal Clip Rail	6-Point Socket

	Components Included	Includes	Container Type	Socket Shape	Drive Size, mm		Each
1/2" Square Drive



	24	24 Sockets	Standard: 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm Standard (cont.): 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 32 mm, 36 mm	Metal Clip Rail	6-Point	9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 36	5894A208	0000000


	24	24 Sockets	Deep: 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm Deep (cont.): 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 32 mm, 36 mm	Metal Clip Rail	6-Point	9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 36	5894A207	000000


	3/4" Square Drive



			15	15 Sockets	Deep: 19 mm, 22 mm, 23 mm, 24 mm, 27 mm, 30 mm, 32 mm, 35 mm, 36 mm, 38 mm, 41 mm, 46 mm, 50 mm, 55 mm, 60 mm	Metal Clip Rail	6-Point	19, 22, 23, 24, 27, 30, 32, 35, 36, 38, 41, 46, 50, 55, 60	5894A209	000000

Extra-Deep 6-Point Sockets


	6-Point Socket

With more than double the clearance of standard sockets, these sockets access nuts on extra-long bolts. The hex shape achieves the best possible grip on hex fasteners and prevents rounding of their points. For use with hand-drive tools only.

Zinc-Plated Steel

					Extra-Deep Clearance
	Drive Size, mm	OD	Socket Shape	For Drive Style	Overall Lg.		Each
1/2" Square Drive



		27	1 1/2"	6-Point	External Hex	6 1/4"	55375A22	000000

Fastener-Holding 6-Point Sockets

6-Point

Socket

Hold fasteners securely in place as you drive them. The hex shape of these sockets achieves the best possible grip on hex fasteners to prevent rounding their points. For use with manual-drive tools only.

Chrome-Plated Steel

Spring-Loaded Ball—Two spring-loaded balls inside these sockets grip nuts and bolts, including nonmagnetic fasteners like stainless steel screws.

						Standard Clearance
	Drive Size, mm	Nut Clearance Dp.	OD	Socket Shape	For Drive Style	Overall Lg.		Each
1/2" Square Drive—Spring-Loaded Ball



		27	21/32"	1 7/16"	6-Point	External Hex	1 9/16"	93317A530	000000

Dual-Size 12-Point Impact Socket Sets


	Dual-Size View	12-Point Socket

Use one socket to switch between two fastener sizes. The spring-loaded innermost wall stays in place for smaller fasteners; push the socket onto a larger fastener and this wall slides out of the way.

With twice as many corners, 12-point sockets grab onto hex-drive fasteners more quickly than 6-point sockets. They also match the external 12-point screws commonly found in heavy duty vehicles such as bulldozers and excavators. Also known as double-hex sockets. These sockets are sturdier and have more give than manual-drive sockets, so they'll withstand the high torque and force of impact tools.

	Components Included	Includes	Container Type	Socket Shape		Each
1/2" Square Drive—Steel



	5	4 Sockets 1 Adapter	Deep: 27 mm × 32 mm, 22 mm × 30 mm, 19 mm × 24 mm, 13 mm × 17 mm 1/4" Hex Drive Adapter	Plastic Case	12-Point	7953N102	0000000

Impact Hex Bit Socket Sets


Plastic Case	For Hex Drives

Use these sockets as an alternative to a screwdriver or L-key. They are made to withstand the high torque and force of impact tools.

	Sockets Included	Material	Container Type	For Drive Style		Each
1" Square Drive



	6	14 mm, 17 mm, 19 mm, 22 mm, 24 mm, 27 mm (4" O'all Lg.)	Black-Oxide Steel	Plastic Case	Hex	6040A33	0000000

Wrench Heads


Wrench and Socket Extension Not Included

Reach nuts obstructed by a fluid line or other barrier with these wrench heads. Connect them to your socket extension and ratchet wrench to turn fasteners where clearance is limited from both the top and side. You can also attach one directly to your ratchet wrench to convert it into an open-ended ratcheting wrench. Also known as crowfoot wrenches.

	Overall Lg.	Thk.	Ctr.-to-Ctr. Lg.	Material	Wrench Opening Shape		Each
1/2" Square Drive



	27	2 15/16"	3/8"	1 3/4"	Chrome-Plated Steel	Round	1882N48	000000

Impact Hex Bit Sockets


	For Hex Drives

These sockets are made to withstand the high torque and force of impact tools.

Compatible Retaining Ring ID—Sockets that list a compatible retaining ring ID require a locking retainer. Use with an impact wrench that has a pin-style socket retainer, or use a socket retaining ring with tools that have a hole- or hole-and-ring style socket retainer.

	Bit Sockets								Retaining Rings
	Drive Size, mm	Overall Lg.	Compatible Retaining Ring ID	Material	Bit Replaceable	For Drive Style		Each		Each
3/4" Square Drive



		27	3 1/2"	1 7/16"	Black-Oxide Steel	No	Hex	53245A2	000000	5552A36	00000


		1" Square Drive



				27	3 15/16"	1 3/4"	Black Oil-Coated Steel	No	Hex	54615A56	00000	5550A68	0000

6-Point Impact Socket Sets


	6-Point Socket

The hex shape grips hex fasteners and prevents rounding. These sockets are made to withstand the high torque and force of impact tools.

3/4" Square Drive—_3/4" square drive size sockets require a locking retainer. Use with an impact wrench that has a pin-style socket retainer, or use a socket retaining ring with tools that have a hole- or hole-and-ring style socket retainer.

	Components Included	Includes	Container Type	Socket Shape		Each
1/2" Square Drive—Black-Oxide Steel



	16	16 Sockets	Standard: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 27 mm	Metal Clip Rail	6-Point	5321A16	0000000


	16	16 Sockets	Deep: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 27 mm	Metal Clip Rail	6-Point	5321A21	000000
	25	25 Sockets	Standard: 8 mm; 9 mm; 10 mm; 11 mm; 12 mm; 13 mm; 14 mm; 15 mm; 16 mm; 17 mm; 18 mm; 19 mm; 20 mm; 21 mm; 22 mm; 23 mm; 24 mm Standard (cont.): 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 32 mm, 36 mm	Metal Clip Rail	6-Point	53105A101	000000
	25	25 Sockets	Deep: 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm Deep (cont.): 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 32 mm, 36 mm	Metal Clip Rail	6-Point	53105A102	000000


	3/4" Square Drive—Black-Oxide Steel



			12	12 Sockets	Standard: 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 27 mm, 30 mm, 32 mm, 36 mm, 41 mm, 46 mm	Metal Clip Rail	6-Point	54175A21	000000


			14	14 Sockets	Deep: 19 mm, 21 mm, 22 mm, 23 mm, 24 mm, 26 mm, 27 mm, 30 mm, 32 mm, 33 mm, 35 mm, 36 mm, 38 mm, 41 mm	—	6-Point	53105A107	000000

L-Keys

The highest quality L-keys you can buy for tightening and loosening screws. Our L-keys are precision manufactured to tight tolerances for an exact fit.

Alloy Steel—These L-keys handle high torque without bending or breaking, so they’ll last a lifetime.

Short—A short long leg fits into tight spaces where you have less room to swing, making these ideal for confined areas.

Long—The most common option, these L-keys have a balanced length for everyday reach and torque.

Extra Long—Reach deep fasteners with the extra-long leg on these L-keys. Flip them around and grip the long leg with two hands for extra leverage to loosen stubborn screws.

		Length					Each		Package
	Drive Size, mm	Overall	Relative	Long Leg	Short Leg	Finish		Each	Pkg. Qty.		Pkg.
Alloy Steel







				Hex

				27	9 1/2"	Short	9 1/2"	3 7/8"	Blue Painted	5984A36	0000000	—	———	0


				27	10 11/16"	Short	9 5/8"	3 7/8"	Black Oxide	7289A27	00000	5	7289A271	0000000
				27	17 5/16"	Long	16 1/4"	3 7/8"	Black Oxide	6958A37	00000	2	6958A371	000000
				27	24 1/16"	Extra Long	23"	3 7/8"	Black Oxide	7122A753	000000	5	7122A168	000000