Power Tools for Professionals



18V High-Torque Impact Wrench with Pin Detent (Bare Tool)

The Bosch HTH181B 18V High-Torque Impact Wrench with Pin Detent is a heavy-duty impact wrench with pin detent system for tool-free socket installation. The wrench is engineered for fastening high-torque nuts and anchors. It delivers up to 500 Ft.-Lbs. of torque. Its spring-loaded hammer-and-anvil system moderates torque reaction to allow for consistent driving power and control, and the wrench is built with an all-metal motor that produces up to 2,100 ipm and up to 1,900 rpm. It offers a square drive 1/2 In. pin detent and true flat anvil design for convenient changing of sockets.

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  • (1) HTH181 18V High-Torque Impact Wrench with Pin Detent


  • High-torque impact wrench design – built to deliver professional power, for fasteners like lag screws, concrete anchors, lug nuts
  • Powerful motor – delivers up to 500 Ft.-Lbs. of torque to drive large fasteners quickly
  • Spring-loaded hammer-and-anvil system – delivers user control and managed torque thrust up to 1,900 rpm and up to 2,100 ipm
  • Metal front housing with 1/2 In. pin detent system – offers jobsite tough durability coupled with convenient changing of sockets
  • True flat anvil design – provides secure fit of sockets to make changing sockets easier
  • Lightweight for high torque – only 5.2 Lbs. (tool only, not including battery)

Technical Data

Battery Chemistry Lithium Ion
Drive 1/2" Square Drive
Height 8.5"
Impact Rate 0 - 2,100
Length 10.0"
Material Metal, High Density Plastic
No Load RPM 0-1,900
Torque (ft. -lbs) 500
Weight 5.2lb
Width 3.0"
Includes (1) HTH181 18V High-Torque Impact Wrench with Pin Detent
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Owner's Manual


Accessories and Attachments For HTH181B

18V Batteries, Chargers and Starter Kits
Edge™ Impact Tough™ Hole Saws
Impact Driver/Wrench Attachments
Impact Tough™ Socket Sets
Impact Tough™ Sockets


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