Skip to main content
Stanley logo in black text on a yellow rectangle, centered on a white background.
SFMCF940B-XJ

18V V20* 1/2 in. 3-Speed Brushless High Torque Impact Wrench (Tool Only)

STANLEY SFMCF940B cordless impact wrench, yellow and black, side angle on white background.

Explore More Options

Current Option

Product details

The 18V STANLEY® FATMAX® V20* Cordless Brushless 1/2" High Torque Impact Wrench (Tool Only) features new and improved battery technology, no memory effect and minimal self-discharge, as well as brushless motor technology for improved power efficiency and longer runtime. The Impact Wrench has a powerful motor which provides up to 2000 RPMand 949Nm of torque for driving large fasteners and other high torque applications. The Impact Wrench is complete with a anvil with hog ring forease of socket change, a 3-speed slider switch and variable speed trigger to control the fastener you are driving, as well as an integral LED work lightfor improved visibility in all working conditions. Part of the 18V STANLEY® FATMAX® V20* Cordless System power all your V20* tools with a commonnew & improved 18V lithium-ion battery to let you power through work with ease.

  • Cordless Freedom : No hoses, no tangles, just complete freedom of movement, wherever the job.
  • Brushless Motor Technology : For improved power efficiency and longer runtime, from a smaller, more compact motor with reduced maintenance, and extended working life.
  • Powerful Motor and Impact Mechanism : Delivers up to 2,000 RPM and 949nm of fastening torque
  • 3 Speed Slider Switch : With variable speed trigger offers increased application control
  • 1/2 " Anvil With Hog Ring : For ease of socket change.
  • Glass Filled Nylon Housings : Offer better oil and chemical resistance
  • Rubber Grip : Offers great comfort in hand
  • Integral LED Work Light : For improved visibility in all working conditions.
  • Part of the V20 Cordless System : Power with battery packs supplied with your Other V20 products

Product Type
Impact Wrench
Voltage
20V
Cordless or Corded
Cordless
Power Source
Cordless
Motor Type
Brushless

  • (1) 18V V20 High Torque Impact Wrench

  • 1 Year Limited Warranty, 3 Year Limited Warranty When Registered

We take extensive measures to ensure all our products are made to the very highest standards and meet all relevant industry regulations.

Customer Support
STANLEY SFMCF820 power tool batteries on wooden table, showcase with yellow-black STANLEY tools in workshop.

Become a super pro with the V20 battery

Choose the power of a battery compatible with more than 100 tools designed for the most demanding professionals.
 

STANLEY SFMCS311B-XJ cordless reciprocating saw cutting metal, close-up of tool in use in workshop.

Carry out your projects

STANLEY® FATMAX® V20, the line of tools you can rely on for all your construction and renovation projects. With its professional quality and versatility, you can cut, saw, drill, chisel, and much more.

STANLEY SFMCS311B-XJ cordless reciprocating saw cutting metal, close-up of tool in use in workshop.
STANLEY SFMCST925B string trimmer in use by person cutting grass in a garden.

Maintain your exteriors

Transform your outdoor spaces with the STANLEY® FATMAX® V20 range. It is the choice of professional quality to effectively maintain all exteriors and gardens.

Image of a STANLEY FATMAX V20 2.0Ah lithium-ion battery on a yellow background with the text 'BATTERY & CHARGER SOLD SEPARATELY' shown below the battery.

Bare tool notice

This item does not include a battery or charger. Compatible batteries and accessories can be found within the V20* system.

Image of a STANLEY FATMAX V20 2.0Ah lithium-ion battery on a yellow background with the text 'BATTERY & CHARGER SOLD SEPARATELY' shown below the battery.
Photo of STANLEY SBW940 power tool with yellow and black V20 4.0Ah lithium-ion battery being attached by gloved hands.

STANLEY® FATMAX® V20

Power all your cordless tools with a single battery. The V20 battery offers more performance, more power, more autonomy and more sustainability to power through any job. 

Explore systemBatteries & chargers