Chicago Pneumatic 8941077311 Air Impact Wrench 3/8 in

Product Description

The CHICAGO PNEUMATIC 8941077311 is a compact pistol-grip air impact wrench designed for professional fastening and removal tasks in automotive, mechanical, and industrial service environments. Built around a 3/8 inch square drive, it delivers up to 470 ft/lb of torque at 9,000 RPM, making it well suited for wheel service, suspension work, and general assembly. The aluminum clutch housing keeps weight down without sacrificing durability. A friction ring retainer secures sockets firmly during use. Licensed technicians and shop mechanics are the primary installers and operators of this tool.

This wrench is intended for use with a compressed air supply regulated to 90 psi through a 1/4 inch NPT inlet. At maximum demand it draws 17 CFM, so an adequately sized compressor and air line are required for sustained performance. The compact tool style suits tight underhood and undercar spaces where larger 1/2 inch drive wrenches cannot fit. It is appropriate for light- to medium-duty professional shop use as well as mobile service operations.

Key Features

• 3/8 inch square drive with friction ring socket retainer
• 470 ft/lb maximum torque at 9,000 RPM
• 1,400 blows per minute for rapid fastener break-loose
• Aluminum clutch housing reduces overall tool weight
• Ultra-compact pistol grip body for restricted-access work
• 1/4 inch NPT air inlet compatible with standard shop fittings

Compatibility

Designed as a professional-grade 3/8 inch drive air impact wrench compatible with standard 3/8 inch impact-rated sockets and accessories. No specific vehicle or equipment model compatibility was provided in the product data.

Installation Notes

This tool is operated by a qualified mechanic or technician using a regulated compressed air supply set to 90 psi maximum. Before connecting or disconnecting the air line, ensure the air supply valve is closed and the line is depressurized. Always use impact-rated sockets rated for the torque output of this wrench — chrome sockets are not suitable and may shatter under impact loads. Follow applicable shop safety standards and any site-specific PPE requirements including hearing protection, as the tool produces 107 decibels during operation.