A torque wrench is a tool used to precisely apply a specific torque to a fastener such as a nut or bolt. It is usually in the form of a socket wrench with special internal mechanisms. It was invented by Conrad Bahr in 1918 while working for the New York City Water Department. It was designed to prevent overtightening bolts on water main and steam pipe repairs underground,The simplest form of torque wrench consists of a long lever arm between the handle and the wrench head, made of a material which bends elastically in response to applied torque. A second, smaller bar with integral mechanical indicator is also connected to the head; this is never subjected to torque and thus maintains a constant position with respect to the head.

High Accuracy:  ±4%

Weight: 0.6KG

Order NO.	Range(N.m)	Square Tenon Dimension(mm)	Resolution(N.m)	L*W*H (mm)
TW-PAB20	4-20	6.3*6.3	0.4	325*28*25