Impact Socket 1/2" 20 mm STANLEY 1-89-120 — 6-point drive

STANLEY 1-89-120 is a 6-point impact socket with a 1/2" square drive and a 20 mm working size, engineered for use with impact wrenches, pneumatic and electric impact tools. The socket is intended to deliver a secure fit on hex fasteners, reduce rounding of bolt heads and withstand the high torque typical of automotive, maintenance and industrial fastening tasks. Its compact 6-point profile concentrates contact on the flats of fasteners to improve grip and torque transfer during heavy-duty operation.

Advantages

The 6-point design provides a stable engagement with hex fasteners, reducing slippage and minimizing damage to bolt heads. Built for impact tool use, the socket tolerates repeated high-torque impulses and offers consistent performance under load. The 1/2" drive size is compatible with a wide range of common impact wrenches, providing versatility across workshops and service environments. The 20 mm working size addresses a common metric fastener dimension, making it suitable for many automotive and machinery applications.

Suitable for

• Automotive wheel and suspension fasteners
• General vehicle maintenance and repair
• Industrial assembly and disassembly requiring high torque
• Workshop and garage fastening tasks with impact tools

Key specifications

• Drive type: 1/2" square drive compatible with impact wrenches
• Working size: 20 mm, 6-point internal profile
• Intended use: designed for impact applications (pneumatic or electric)
• Profile: 6-point for secure engagement with hex fasteners
• Typical applications: automotive, maintenance and industrial fastening

How to use

Select the 20 mm STANLEY impact socket and mount it securely onto the 1/2" drive of a compatible impact wrench or adapter. Fit the socket squarely onto the hex fastener, ensuring full contact with the flats before applying torque. Operate the impact tool following the tool manufacturer's safety and operating instructions, using appropriate torque settings and controlled bursts to avoid over-tightening. After use, inspect the socket for wear or damage and store it in a dry, organized toolbox to prolong service life.

Usage recommendations

Use only with impact-rated tools and accessories; avoid using the socket with manual ratchets or as a substitute for hand tools when precision torque control is required. Regularly check for cracking, rounding or deformation and replace the socket if any damage is detected. Wear appropriate personal protective equipment when working with impact tools.