Air Impact Wrenches

About Air Impact Wrenches

Air impact wrenches are pneumatic power tools that deliver high torque output using compressed air to drive an internal hammering mechanism. Essential for automotive workshops, heavy machinery maintenance, and assembly operations, these tools provide consistent power without battery limitations, making them ideal for professional environments requiring continuous use. The range at MyToolShed.co.uk includes models from Sealey, Draper, Bahco, and Facom, covering drive sizes from 3/8" for lighter automotive tasks through to 1" drives for heavy industrial applications.

Available in various configurations including compact butterfly designs for confined spaces and powerful twin hammer models for maximum breakaway torque, air impact wrenches typically require an air compressor delivering 90-120 PSI with 4-6 CFM air consumption. Their lightweight design and instant power delivery make them particularly suited to professional tradespeople demanding reliability throughout long working days in busy workshop environments.

Applications

Air impact wrenches are essential tools for numerous trades and industries, including:

• Motor mechanics and automotive technicians - wheel changes, suspension work, and engine repairs
• HGV and plant machinery fitters - working with larger fasteners on commercial vehicles and heavy equipment
• MOT testing stations and tyre fitting centres - rapid wheel removal and fitting operations
• Agricultural engineers - maintaining tractors, combines, and farm machinery
• Manufacturing and production line workers - high-volume assembly operations
• Plant maintenance engineers - servicing industrial equipment and machinery
• Fabrication and steelwork specialists - assembling structural components with large bolts
• Mobile mechanics and breakdown services - requiring reliable, portable power solutions

Choosing The Right Air Impact Wrenches

Drive Size: Select 3/8" drive for light automotive work, 1/2" drive for general automotive and mechanical applications (the most versatile option), whilst 3/4" and 1" drives suit heavy commercial vehicles and industrial applications.

Torque Requirements: Match torque specifications to your applications. Standard automotive work typically requires 400-600 Nm, whilst commercial applications may need 1000 Nm or more. Consider both breakaway (loosening) and tightening torque figures.

Air Compressor Compatibility: Verify your compressor delivers sufficient CFM at the required PSI. Most 1/2" drive models need 4-6 CFM at 90 PSI. Undersized compressors cause performance issues and reduced efficiency.

Weight and Ergonomics: For extended use, consider lightweight composite body models which reduce operator fatigue. Twin hammer mechanisms offer superior vibration reduction compared to single hammer designs, important for user comfort and HSE compliance.

Build Quality: Professional-grade tools from manufacturers like Sealey, Draper, and Facom available at MyToolShed.co.uk offer superior durability and parts availability, crucial for demanding workshop environments.

Safety Information

Personal Protective Equipment: Always wear safety glasses and hearing protection, as impact wrenches generate noise levels exceeding 85dB and can eject debris at high velocity.

Hand-Arm Vibration: Prolonged exposure can contribute to HAVS. Employers must assess vibration levels according to the Control of Vibration at Work Regulations 2005. Twin hammer models typically produce lower vibration levels.

Socket Usage: Only use impact-rated chrome molybdenum sockets. Standard chrome vanadium sockets can shatter under impact loading, creating serious injury risk.

Torque Control: Air impact wrenches can easily over-torque fasteners. Finish critical fasteners with a calibrated torque wrench to manufacturer specifications.

Frequently Asked Questions

What size air compressor do I need for an impact wrench?
Most 1/2" drive air impact wrenches require 4-6 CFM at 90 PSI. For professional workshop use, a minimum 50-litre tank with a 2-3 HP motor is recommended. Check your chosen model's specific CFM requirements and ensure your compressor exceeds this by 20-30% for optimal performance.

Can I use regular sockets with an air impact wrench?
No, you must use impact-rated sockets made from chrome molybdenum steel. Standard chrome vanadium sockets designed for hand tools can shatter under repeated hammering action, posing serious safety risks. Impact sockets are identifiable by their black oxide finish and thicker walls.

How do I maintain my air impact wrench?
Add 3-4 drops of pneumatic tool oil into the air inlet before each use, or install an inline air lubricator. Drain moisture from your compressor tank regularly and use an inline filter to prevent water contamination. Periodically check for worn hammer mechanisms and store in a dry environment.