Impact Wrenches

About Impact Wrenches

Impact wrenches are high-torque power tools designed to deliver substantial rotational force through a hammering impact mechanism, making them essential for fastening and loosening nuts and bolts that would be difficult or impossible with standard ratchets. Unlike impact drivers which use hexagonal bit holders, impact wrenches feature square drive fittings (commonly 1/4", 3/8", 1/2", or 3/4") that accept impact-rated sockets. MyToolShed.co.uk stocks a comprehensive range of cordless and corded electric impact wrenches from leading manufacturers including Makita, DeWalt, and Bosch Professional.

Available in various power configurations, cordless models typically range from compact 12v units for lighter duties through to powerful 18v brushless versions capable of delivering over 1,000Nm of torque. Corded impact wrenches are also available in 240v for standard mains power or 110v for site transformer use, generally offering higher continuous torque output for the most demanding applications. MyToolShed also stocks pneumatic air impact wrenches in a separate air tools category for workshop environments with compressed air systems.

Applications

Impact wrenches are indispensable across numerous trades and industries:

• Automotive mechanics - wheel changes, engine work, and general vehicle maintenance
• Scaffolders - assembly and dismantling of scaffolding structures to specific torque requirements
• Steel erectors - structural steel fastening on construction projects
• Plant and machinery maintenance - heavy equipment servicing and repairs
• Agricultural engineers - farm machinery maintenance and field repairs
• Mobile tyre fitting - roadside wheel changes and tyre services
• Construction contractors - various fastening applications on building sites
• DIY enthusiasts - automotive work, equipment maintenance, and general workshop tasks

Choosing The Right Impact Wrenches

When selecting an impact wrench from MyToolShed.co.uk, consider these key factors:

Drive size: 1/2" square drive is the most versatile for general automotive and construction work, whilst 3/8" suits lighter duties and 3/4" handles heavy industrial applications. Smaller 1/4" drives are ideal for confined spaces.

Power source: Cordless 18v models offer excellent portability and performance for most applications. Choose 240v corded versions for continuous heavy-duty workshop use where maximum power is required. Consider 12v compact wrenches for tight access areas.

Torque output: Match the torque rating to your applications - 200-400Nm suits general work, 600-800Nm handles most automotive tasks, whilst 1,000Nm+ tackles heavy machinery and structural steel work.

Brushless motors: Provide longer runtime, increased power efficiency, and extended tool life compared to brushed alternatives.

Battery compatibility: If you already own cordless tools, selecting impact wrenches compatible with your existing battery platform offers significant cost savings.

Safety Information

Always use impact-rated sockets (identifiable by their black oxide finish) with impact wrenches - standard chrome sockets can shatter under the hammering action, creating dangerous projectiles. For torque-critical applications such as scaffolding or wheel fastening, verify that your impact wrench can achieve the required torque specification, and consider using a calibrated torque wrench for final verification, as manufacturer specifications may vary from real-world performance. Wear appropriate eye protection and ensure workpieces are securely supported before operation.

Frequently Asked Questions

What's the difference between an impact wrench and an impact driver?

Impact wrenches have square drive fittings for use with sockets and are designed for nuts and bolts, whilst impact drivers have hexagonal bit holders for screwdriving applications. Impact wrenches typically deliver higher torque output for heavier fastening tasks.

Can I use regular sockets with an impact wrench?

No - you must use impact-rated sockets which are specially hardened to withstand the hammering action. Standard chrome sockets can crack or shatter, posing serious safety risks. Impact sockets have a black finish for easy identification.

How much torque do I need for wheel nuts?

Most car wheel nuts require 80-120Nm, whilst vans and light commercials need 120-180Nm. An impact wrench with 400-600Nm output handles most automotive wheel changes comfortably, though final tightening should be verified with a torque wrench to manufacturer specifications.