Bauer 3/8″ Compact Impact Wrench – 20V Cordless Power Tool
Our 3/8″ compact impact wrench was engineered for users who need serious torque without the bulk. Delivering 150 ft-lbs of fastening torque and 200 ft-lbs of breakaway torque, this tool tackles lug nuts, suspension bolts, and engine components with ease.
Weighing just 2.4 lbs (tool only), it reduces fatigue during extended use and fits into spaces where full-size impacts can’t reach. The variable speed trigger gives you precise control for delicate fasteners or maximum power when you need it. We paired it with our 20V lithium-ion battery platform, so you can swap batteries across your entire Bauer cordless collection.
The rubberized grip stays comfortable even during all-day jobs, and the built-in LED work light illuminates dark engine bays and undercarriage areas. Whether you’re a professional mechanic or a weekend DIYer, this compact impact wrench becomes an essential part of your toolkit.
- 150 ft-lbs fastening torque / 200 ft-lbs breakaway torque
- 3/8″ square drive anvil with detent pin retention
- Variable speed trigger (0-2,400 RPM / 0-3,200 IPM)
- Tool weight: 2.4 lbs (bare tool)
- Integrated LED work light with shadow reduction
Power & Performance Engineering
The Bauer tools 3/8″ compact impact wrench uses a precision-balanced hammer and anvil mechanism that delivers consistent impact energy with every trigger pull. Our brushless motor technology maximizes runtime and extends tool life by eliminating the friction and wear of traditional brushed motors.
The 150 ft-lbs of fastening torque handles most automotive applications including wheel changes, brake caliper work, and exhaust system repairs. When you encounter seized or rusted fasteners, the 200 ft-lbs breakaway torque provides the extra muscle needed without requiring a larger, heavier tool.
Compact Design for Tight Spaces
At just 5.2 inches in length, this impact wrench accesses areas that defeat full-size models. We’ve used it successfully in engine bays with limited clearance, behind dashboard assemblies, and in cramped undercarriage spaces where every inch matters.
The 2.4 lb tool weight (without battery) means you can work overhead for extended periods without arm fatigue. The balanced weight distribution keeps the tool stable even at full speed, reducing the tendency to torque sideways that plagues poorly designed compact impacts.
Battery Compatibility & Runtime
This impact wrench runs on our 20V lithium-ion battery platform, which powers over 50 tools in the Bauer cordless lineup. If you already own Bauer 20V tools, your existing batteries work immediately without adapters or modifications.
With a 2.0Ah battery, expect approximately 85-100 lug nut removals per charge under typical automotive conditions. Upgrading to a 4.0Ah battery roughly doubles that capacity while adding only 6 ounces to the overall tool weight. The battery fuel gauge shows remaining charge at a glance, so you’re never surprised by a dead pack mid-project.
More cordless impact tools from Bauer
What people are saying
Common questions about the 3/8″ compact impact wrench
The primary differences are torque output and tool size. Our 3/8″ compact impact wrench delivers 150 ft-lbs fastening torque in a 5.2-inch length and 2.4 lb weight, making it ideal for automotive work, small engine repair, and applications in confined spaces.
The 1/2″ model produces 300 ft-lbs torque with a larger anvil for heavy-duty fasteners, but measures 7.1 inches long and weighs 3.8 lbs. Choose the 3/8″ for versatility and access; choose the 1/2″ when maximum torque is essential for truck, industrial, or construction fastening.
Yes, the 150 ft-lbs fastening torque and 200 ft-lbs breakaway torque handle passenger car and light truck lug nuts without issue. Most factory lug nuts are torqued to 80-100 ft-lbs, well within this tool’s capability.
For heavy-duty trucks with lug nuts torqued above 150 ft-lbs, or extremely rusted fasteners, you may need to step up to our 1/2″ impact wrench with 300 ft-lbs output. We recommend using impact-rated sockets rather than standard chrome sockets to prevent cracking under the repeated impact loads.
Any Bauer 20V lithium-ion battery works with this impact wrench. For occasional home use, a 2.0Ah battery provides 85-100 lug nut removals per charge and keeps the tool lightweight.
Professional users or those tackling larger projects should consider a 4.0Ah battery, which roughly doubles runtime to 170-200 fasteners per charge. The 4.0Ah adds only 6 ounces to the overall tool weight but eliminates mid-job battery swaps. We don’t recommend batteries smaller than 2.0Ah, as they may not deliver adequate current for sustained high-torque applications.
Many professional technicians use this impact wrench as their primary tool for general automotive repair. The 150 ft-lbs torque covers approximately 80% of fasteners encountered in brake service, suspension work, interior trim, and engine bay repairs.
Pros appreciate the compact size for accessing cramped areas and the reduced weight for all-day use. However, shops focused on heavy truck repair, industrial equipment, or large-scale construction may need the additional power of our 1/2″ impact wrench for primary use, while keeping the 3/8″ model for tight-access situations.
The integrated LED work light activates automatically when you pull the trigger and remains illuminated for 15 seconds after you release it. This delay gives you time to position fasteners or reach for your next tool without losing visibility.
The LED draws minimal current from the battery, so its use doesn’t meaningfully impact runtime. We positioned the LED to minimize shadows cast by the anvil and socket, providing better illumination directly at the fastener compared to headlamps or work lights.
While standard chrome sockets physically fit the 3/8″ square drive, we strongly recommend impact-rated sockets for safety and longevity. Chrome sockets are designed for hand ratchets and can crack or shatter under the repeated high-torque impacts this tool generates.
Impact sockets are made from chrome molybdenum steel with a black oxide or black phosphate finish, making them easily distinguishable from chrome sockets. They have thicker walls to absorb impact energy and feature a six-point design that grips fasteners more securely. Our Bauer impact socket sets are engineered specifically to match this tool’s torque output.
Minimal routine maintenance keeps this tool performing optimally. Apply one drop of air tool oil to the 3/8″ anvil every 20-30 hours of use while rotating it by hand to distribute lubrication. Wipe down the air vents after each use to prevent dust buildup.
Inspect the battery terminals monthly and clean with a dry brush if you notice corrosion or debris. Store the tool in a dry location between 50-100°F and remove the battery during extended storage. The brushless motor is sealed and requires no internal maintenance – never attempt to disassemble the motor housing, as this voids the warranty.