Torque Adapters | McMaster-Carr

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About Torque Tools

Attach one of these heads to your square-drive ratchet or torque wrench to extend its reach or to access spaces with limited vertical clearance. Add an extension to get to an obstructed fastener.

When used with a ratchet wrench, it can also help you get more leverage to break a stuck bolt loose. When used with a torque wrench, you can easily calculate your desired torque setting with the precise 2" center-to-center length. Also known as torque adapters.

The box end grips all sides of the fastener to prevent slipping. For use with hand-drive tools only.

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

3/8" Square Drive
Drive Size	Overall Lg.	Thick.	Center-to-Center Lg.	Material		Each
3/8"	2 11/16"	17/64"	2"	Chrome-Plated Steel	00000000	000000
7/16"	2 3/4"	19/64"	2"	Chrome-Plated Steel	00000000	00000
1/2"	2 13/16"	21/64"	2"	Chrome-Plated Steel	00000000	00000
9/16"	2 7/8"	23/64"	2"	Chrome-Plated Steel	00000000	00000
5/8"	2 7/8"	25/64"	2"	Chrome-Plated Steel	00000000	00000
11/16"	2 15/16"	27/64"	2"	Chrome-Plated Steel	00000000	00000
3/4"	3"	29/64"	2"	Chrome-Plated Steel	00000000	00000
13/16"	2 15/16"	31/64"	2"	Chrome-Plated Steel	00000000	00000
7/8"	3 1/16"	33/64"	2"	Chrome-Plated Steel	00000000	00000

Torque-and-Angle Measuring Socket Adapters

A digital display shows how torque measurements change as you turn the wrench. Set the desired torque and angle—lights and an audible alarm indicate when target has been reached or exceeded.

Note: The accuracy ratings do not apply to the lower 10% of the torque range.

				Accuracy
Overall Lg.	OD	Torque Range	Graduations	Clockwise	Counterclockwise	Max. Speed, rpm	Angle	Angle Accuracy	Material	Batteries Included		Each
3/8" Square Drive
3 1/2"	2 1/8"	60 to 1,200 in.-lbs. 5 to 100 ft.-lbs. 6.78 to 135 Nm	1 in.-lbs. 0.1 ft.-lbs. 0.1 Nm	±2%	±2%	300	5°-360°	±1%	Chrome-Plated Steel	Yes	0000000	0000000
1/2" Square Drive
3 7/8"	2 1/8"	150 to 3,000 in.-lbs. 12.5 to 250 ft.-lbs. 17 to 340 Nm	1 in.-lbs. 0.1 ft.-lbs. 0.1 Nm	±2%	±2%	300	5°-360°	±1%	Chrome-Plated Steel	Yes	0000000	000000

Adjustable Torque-Limiting Socket Adapters

Socket Adapter

Pin Kit

To set torque, remove the snap ring and locking plate and adjust the nut. When the torque setting is reached, the adapter clicks and releases. These tools let you accurately measure or limit the torque you apply to prevent overtightening and damaging fasteners.

Use clockwise and counterclockwise adapters to tighten fasteners in both directions. You’ll need to change tools to loosen the fasteners.

Use clockwise adapters to tighten fasteners in the clockwise direction as well as loosen them in the counterclockwise direction. There’s no need to change tools.

Socket Adapters										Replacement Pin Kits
Overall Lg.	OD	Torque Range	Torque-Limiting Direction	Clockwise Accuracy	Counterclockwise Accuracy	Max. Speed, rpm	Material		Each		Each
3/8" Square Drive
2 1/8"	1 1/2"	24 to 180 in.-lbs. 2 to 15 ft.-lbs. 2.7 to 20.3 Nm	Clockwise and Counterclockwise	±5%	±5%	300	Nickel-Plated Steel	0000000	0000000	00000000	000000
2 1/8"	1 1/2"	60 to 300 in.-lbs. 5 to 25 ft.-lbs. 6.8 to 33.9 Nm	Clockwise and Counterclockwise	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
2 3/16"	1 1/2"	24 to 180 in.-lbs. 2 to 15 ft.-lbs. 2.7 to 20.3 Nm	Clockwise	±5%	__	300	Nickel-Plated Steel	00000000	000000	00000000	00000
2 3/16"	1 1/2"	60 to 300 in.-lbs. 5 to 25 ft.-lbs. 6.8 to 33.9 Nm	Clockwise	±5%	__	300	Nickel-Plated Steel	00000000	000000	00000000	00000
1/2" Square Drive
2 5/8"	1 3/4"	120 to 480 in.-lbs. 10 to 40 ft.-lbs. 13.6 to 54.2 Nm	Clockwise and Counterclockwise	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
2 5/8"	1 3/4"	240 to 600 in.-lbs. 20 to 50 ft.-lbs. 27.1 to 67.8 Nm	Clockwise and Counterclockwise	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
2 5/8"	2 1/4"	480 to 900 in.-lbs. 40 to 75 ft.-lbs. 54.2 to 101.7 Nm	Clockwise and Counterclockwise	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
2 11/16"	1 3/4"	120 to 480 in.-lbs. 10 to 40 ft.-lbs. 13.6 to 54.2 Nm	Clockwise	±5%	__	300	Nickel-Plated Steel	00000000	000000	00000000	00000
2 11/16"	1 3/4"	240 to 600 in.-lbs. 20 to 50 ft.-lbs. 27.1 to 67.8 Nm	Clockwise	±5%	__	300	Nickel-Plated Steel	00000000	000000	00000000	00000
2 3/4"	3"	720 to 1,440 in.-lbs. 60 to 120 ft.-lbs. 81.3 to 162.7 Nm	Clockwise and Counterclockwise	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
2 13/16"	3"	720 to 1,440 in.-lbs. 60 to 120 ft.-lbs. 81.3 to 162.7 Nm	Clockwise	±5%	__	300	Nickel-Plated Steel	00000000	000000	00000000	00000

Factory-Set Torque-Limiting Socket Adapters

Socket Adapter

Pin Kit

Already set to a specific torque limit, these adapters audibly click and release when you reach that setting to prevent overtightening.

Adapters with a calibration certificate come with a document traceable to NIST that states the adapters passed a test for accuracy.

Socket Adapters
			Accuracy						Replacement Pin Kits
Torque Setting, in.-lbs.	Overall Lg.	OD	Clockwise	Counterclockwise	Max. Speed, rpm	Material		Each		Each
Adapters
3/8" Square Drive
30	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	00000000	0000000	00000000	000000
45	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	00000000	000000	00000000	00000
50	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	00000000	000000	00000000	00000
60	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
75	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
80	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	00000000	000000	00000000	00000
100	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	00000000	000000	00000000	00000
120	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	00000000	000000	00000000	00000
150	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	00000000	000000	00000000	00000
180	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
200	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	00000000	000000	00000000	00000
240	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
300	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	00000000	000000	00000000	00000
1/2" Square Drive
300	2 11/16"	1 3/4"	±5%	±5%	300	Nickel-Plated Steel	00000000	000000	00000000	00000
360	2 11/16"	1 3/4"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
Adapters—Calibration Certificate with Test Data Traceable to NIST Certificate of Calibration
3/8" Square Drive
30	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
45	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
50	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
60	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
75	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
80	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
100	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
120	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
150	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
180	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
200	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
240	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
300	2 3/16"	1 1/2"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
1/2" Square Drive
300	2 11/16"	1 3/4"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000
360	2 11/16"	1 3/4"	±5%	±5%	300	Nickel-Plated Steel	0000000	000000	00000000	00000

Impact Torque-Limiting Socket Adapters

Prevent overtightening that can damage fasteners. These adapters spring back slightly when the set torque is reached. They are made to withstand the high torque and force of impact tools.

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

				Accuracy
Torque Setting, ft.-lbs.	Overall Lg.	OD	For Max. Wrench Working Torque, ft.-lbs.	Clockwise	Counterclockwise	For Max. Wrench Operating Air Pressure, psi	Material	Color		Each
1/2" Square Drive
65	7 5/8"	1 1/8"	250	±10%	±10%	90	Painted Steel	Yellow	0000000	000000
80	7 5/8"	1 1/8"	250	±10%	±10%	90	Painted Steel	Blue	0000000	00000
100	7 5/8"	1 1/8"	250	±10%	±10%	90	Painted Steel	Gray	0000000	00000
120	7 5/8"	1 1/8"	250	±10%	±10%	90	Painted Steel	White	0000000	00000
140	7 5/8"	1 1/8"	250	±10%	±10%	90	Painted Steel	Turquoise	0000000	00000

Box-End Wrench Head Sets

Wrench Not Included

Attach one of the heads in these sets to a torque wrench for more leverage to loosen a stubborn fastener. Also known as torque adapters. You can easily calculate your desired torque setting with the precise 2” center-to-center length. The wrench heads can also be connected to an extension to reach fasteners when vertical clearance is limited. The box end grips all sides of the fastener to prevent slipping. For use with hand-drive tools only.

3/8" Square Drive
No. of Pieces	Includes	Center-to-Center Lg.	Material		Each
9	Wrench Heads: 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8"	2"	Chrome-Plated Steel	00000000	0000000
10	Wrench Heads: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm	2"	Chrome-Plated Steel	000000000	00000

Snap-Open Ratcheting Box-End Wrench Head Sets

Wrench and Socket Extension Not Included

Get a strong grip in tight areas, even on fasteners that are rounded or damaged. Open the spring-loaded jaws in these heads to access a fastener like an open-end wrench; the jaws will automatically close when you push against the fastener. The 6-point opening grips hex heads on all sides. Also known as crowfoot wrenches. Attach one to a socket extension to reach obstructed fasteners. With the ratcheting feature, you can turn the fastener without removing and repositioning the wrench head.

3/8" Square Drive
No. of Pieces	Includes	Turn Required to Ratchet	Material	Wrench Opening Shape	Container Type		Each
6	Wrench Heads: 8 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm	15°	Stainless Steel	6-Point	Foam Tray	000000000	0000000

Impact Torque-Limiting Socket Adapter Sets

Prevent overtightening that can damage fasteners. These adapters spring back slightly when the set torque is reached. They are made to withstand the high torque and force of impact tools.

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

					Accuracy
No. of Pieces	Includes	O'all Lg.	OD	For Max. Wrench Working Torque, ft.-lbs.	Clockwise	Counterclockwise	For Max. Wrench Operating Air Pressure, psi		Each
1/2" Square Drive—Painted Steel
5	Torque-Limiting Adapter with 65 ft.-lbs.Torque Setting—Yellow Torque-Limiting Adapter with 80 ft.-lbs.Torque Setting—Blue Torque-Limiting Adapter with 100 ft.-lbs.Torque Setting—Gray Torque-Limiting Adapter with 120 ft.-lbs.Torque Setting—White Torque-Limiting Adapter with 140 ft.-lbs.Torque Setting—Turquoise	7 5/8"	1 1/8"	250	±10%	±10%	90	0000000	0000000

Torque-Measuring Bit Adapters

Eliminate the need for multiple bulky tools with these bit adapters. At less than 3 inches long, these compact adapters convert 1/4" bit screwdriver handles and 1/4" bits into torque scredrivers so you can fasten to a specific torque. Insert your drive handle and turn clockwise until the hash marks line up with the torque value you need. Not for use with power tools.

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

With Magnet
For Bit Hex Shank Size	For Drive Style	For Drive Size	Torque Range	Graduations	Clockwise Accuracy	Torque-Measuring Direction	Overall Length	Material		Each
in.-lbs.
1/4"	Hex	1/4"	6 in.-lbs.-25 in.-lbs.	4 in.-lbs., 5 in.-lbs.	±10%	Clockwise	2 3/16"	Steel	000000000	000000
1/4"	Hex	1/4"	15 in.-lbs.-65 in.-lbs.	10 in.-lbs.	±10%	Clockwise	2 3/4"	Steel	000000000	00000
Nm
1/4"	Hex	1/4"	2 Nm-6 Nm	1 Nm	±10%	Clockwise	2 3/4"	Steel	000000000	00000

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About Torque Tools

Box-End Wrench Heads

Torque-and-Angle Measuring Socket Adapters

Adjustable Torque-Limiting Socket Adapters

Factory-Set Torque-Limiting Socket Adapters

Impact Torque-Limiting Socket Adapters

Box-End Wrench Head Sets

Snap-Open Ratcheting Box-End Wrench Head Sets

Impact Torque-Limiting Socket Adapter Sets

Torque-Measuring Bit Adapters