Proto J138WP-M 3/8 in Air Impact Wrench 445 Ft/lb

Product Description

The PROTO J138WP-M is a 3/8 inch drive pneumatic impact wrench built for professional fastening applications in automotive, mechanical, and industrial service environments. Rated at 445 ft/lb of torque and 6,000 RPM free speed, it delivers the power needed to break loose stubborn fasteners or drive high-torque hardware quickly. The pistol grip handle keeps the tool compact at 4.4 inches in overall length, and the handle exhaust directs air away from the work area. This tool is intended for use by licensed mechanics, industrial technicians, and trade professionals who work with air-powered hand tools daily.

The J138WP-M is suited for under-hood automotive work, fleet maintenance, assembly line use, and general mechanical service where a 3/8 inch drive impact is the appropriate size. At 90 psi operating pressure and 3 CFM air consumption, it is compatible with standard shop compressor setups. The 1/4 inch NPT inlet and a minimum 3/8 inch hose recommendation make it easy to integrate into an existing compressed-air system. The compact pistol grip form factor fits into tighter access points where larger 1/2 inch drive tools cannot.

Key Features

• 445 ft/lb maximum torque output with 1,260 impacts per minute for fast, high-force fastening
• 6,000 RPM free speed for rapid run-down on standard fasteners
• Pistol grip handle with handle exhaust keeps debris and air discharge away from the operator and work surface
• 1/4 inch NPT inlet with 3 CFM air consumption integrates with common shop compressor lines
• Compact 4.4 inch overall length fits in restricted access areas
• Weighs 2.9 pounds for reduced operator fatigue during extended use

Compatibility

Designed as an OEM-specification 3/8 inch drive pneumatic impact wrench for professional automotive and industrial service applications requiring a standard 90 psi shop air supply.

Installation Notes

Installation and operation should be performed by qualified mechanics or pneumatic tool technicians familiar with compressed-air tool systems. Before connecting or disconnecting the tool, depressurize the air line and confirm the supply is regulated to 90 psi. Use a minimum 3/8 inch inside-diameter air hose to ensure adequate airflow and prevent pressure drop. Always use impact-rated sockets rated for the torque output of this tool.