Torque Multipliers | McMaster-Carr

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22 Products

About Torque Tools

Bracing Bar Shown In Use

Bracing Foot Shown In Use

Multiplier Shown with Bracing Bar Attached

Multiplier Shown with Bracing Foot Attached

Apply more torque than your wrench can deliver on its own. Internal gears multiply the amount of force (or torque) that can be applied to the fastener. Use a multiplier with a torque wrench to ensure you do not exceed the maximum input torque. Place the bracing bar or bracing foot against a stationary object to keep the multiplier in place. Accuracy is rated on the torque output.

To determine torque output, use the Torque Multiplication factor. For example, if the torque multiplication factor is 3.3X and you apply 100 ft.-lbs. of torque, the torque output would be 330 ft.-lbs.

Multipliers with backlash protection prevent the wrench from swinging back when torqued.

Multipliers with overtorque protection have an output square drive that shears off to protect the gears when overtorqued.

Multipliers that also include a bracing foot let you work in tight spots too. But keep in mind, using a bracing foot requires more effort to apply the same force compared to using a bracing bar because it can't distribute the force as much.

Multipliers
	Input Square Drive			Output Square Drive			Accuracy			Head					Replacement Output Square Drives
Torque Multiplication	Size	Gender	Max. Torque Input, ft.-lbs.	Size	Gender	Max. Torque Output, ft.-lbs.	Clockwise	Counterclockwise	O'all Lg.	Dia.	Ht.	Includes		Each		Each
For Hand Tools
3X	1/2"	Female	250	3/4"	Male	750	±5%	±5%	8 5/8"	2 7/8"	3 1/4"	Bracing Bar	0000000	0000000	000000	00
4X	1/2"	Female	295	3/4"	Male	1,000	±5%	±5%	22 1/2"	3 1/2"	3 3/8"	Bracing Bar	000000	000000	000000	00
4X	3/4"	Female	588	1"	Male	2,000	±5%	±5%	24"	3 5/8"	4 3/8"	Bracing Bar	000000	000000	000000	00
4.33X	1"	Female	1,176	1 1/2"	Male	4,000	±5%	±5%	30"	5 1/4"	6 1/8"	Bracing Bar	000000	00000000	000000	00
5X	1/2"	Female	220	3/4"	Male	1,100	±5%	±5%	10 3/8"	4 1/4"	7 1/4"	Bracing Bar Bracing Foot Carrying Case	00000000	000000	000000	00
5X	3/4"	Female	390	1"	Male	1,950	±5%	±5%	10 3/8"	4 1/4"	7 1/4"	Bracing Bar Bracing Foot Carrying Case	00000000	000000	000000	00
For Hand Tools—With Overtorque Protection
6X	1/2"	Female	200	3/4"	Male	1,200	±5%	±5%	19 3/4"	4"	4"	Bracing Bar Replacement Output Square Drive	0000000	00000000	0000000	0000000
For Hand Tools—With Backlash Protection
15.5X	1/2"	Female	141	1"	Male	2,200	±5%	±5%	10 1/8"	4 1/4"	6 1/8"	Bracing Bar Bracing Foot Carrying Case	00000000	00000000	000000	00
26X	1/2"	Female	126	1"	Male	3,300	±5%	±5%	10 3/8"	4 1/4"	7"	Bracing Bar Bracing Foot Carrying Case	00000000	00000000	000000	00
For Hand Tools—With Backlash Protection and Overtorque Protection
13.6X	1/2"	Female	162	1"	Male	2,200	±5%	±5%	19 3/4"	4 1/8"	5 3/4"	Bracing Bar Replacement Output Square Drive	0000000	00000000	0000000	000000
18.5X	1/2"	Female	173	1"	Male	3,200	±5%	±5%	19 3/4"	4 1/8"	6 1/2"	Bracing Bar Replacement Output Square Drive	0000000	00000000	0000000	000000

Mountable Torque Multipliers

Anchor these multipliers for added stability and to apply more torque than your wrench can deliver on its own. Internal gears multiply the amount of force (or torque) that can be applied to the fastener. To mount the multiplier, place a socket between the anchor on the bracing plate and a secured fastener. Use with a torque wrench to ensure you do not exceed the maximum input torque. Multipliers have backlash protection that prevents the wrench from swinging back when torqued. In case of overtorque, the output square drive shears off to protect the gears. Accuracy is rated on the torque output.

		Input Square Drive			Output Square Drive			Accuracy			Head
Anchor Square Drive Size	Torque Multiplication	Size	Gender	Max. Torque Input, ft.-lbs.	Size	Gender	Max. Torque Output, ft.-lbs.	Clockwise	Counterclockwise	O'all Lg.	Dia.	Ht.	Includes		Each
For Hand Tools and Nonimpact Power Tools
1"	13.6X	1/2"	Female	162	1"	Male	2,200	±5%	±5%	14"	4 7/8"	5 1/2"	Replacement Output Square Drive	00000000	000000000
1"	18.5X	1/2"	Female	173	1"	Male	3,200	±5%	±5%	14"	4 7/8"	6 1/2"	Replacement Output Square Drive	00000000	00000000
1 1/2"	26.5X	1/2"	Female	189	1 1/2"	Male	5,000	±5%	±5%	15"	5 5/8"	8 3/4"	Replacement Output Square Drive	00000000	00000000

Replacement Output Square Drives for 26.5X Torque Multiplier	00000000	Each	0000000
Replacement Output Square Drives for 18.5X Torque Multiplier	0000000	Each	000000
Replacement Output Square Drives for 13.6X Torque Multiplier	0000000	Each	000000

Low-Profile Torque Multipliers

Get the force of a standard torque multiplier without the bulk. These multipliers are less than 2" high, so they fit where you have limited clearance above a fastener. Use them to apply more torque than your wrench can deliver on its own. Internal gears multiply the amount of force (or torque) that can be applied to the fastener. To avoid exceeding the maximum input torque, pair these multipliers with a torque wrench. You can also attach a bracing arm (sold separately) to absorb the backlash after the fastener is tight. Accuracy is rated on the torque output.

To determine torque output, use the torque multiplication factor. For example, if the torque multiplication factor is 3.9X and you apply 100 ft.-lbs. of torque, the torque output would be 390 ft.-lbs.

Multipliers
	Input Square Drive			Output Square Drive			Accuracy		Overall					Bracing Arms
Torque Multiplication	Size	Gender	Max. Torque Input, ft.-lbs.	Size	Gender	Max. Torque Output, ft.-lbs.	Clockwise	Counterclockwise	Lg.	Wd.	Thick.		Each		Each
For Hand Tools
3.9X	1/2"	Female	250	3/4"	Male	1,000	±7.5%	±7.5%	8 3/4"	2 3/4"	1 1/4"	00000000	000000000	00000000	0000000
3.9X	3/4"	Female	600	1"	Male	2,400	±7.5%	±7.5%	12 1/8"	3 3/4"	1 3/4"	00000000	00000000	00000000	000000