Impact Extension Bar 1" with Hole 400 mm — JCB

The JCB Impact Extension Bar 1" with Hole 400 mm is a heavy-duty socket extension engineered for use with impact wrenches and powered fastening tools. Constructed to transfer high torque while maintaining alignment under shock loads, this 400 mm extension includes a through-hole that allows secure retention with a pin or clip. It is intended for professional environments where extended reach and reliable pin retention are required for loosening and tightening fasteners in automotive, industrial, and construction maintenance.

Advantages

The extension bar is made from impact-rated steel and heat-treated for durability, providing resistance to deformation when subjected to repeated high-torque impacts. The 1" drive size ensures compatibility with large impact sockets and heavy-duty tooling, while the 400 mm length offers extended reach into recessed or hard-to-access fasteners. The through-hole enables positive locking with a pin or clip to prevent unintended disconnection during use.

Suitable for

• Automotive repair and tyre service where deep or recessed nuts and bolts are present
• Heavy machinery maintenance in industrial and agricultural settings
• Construction site bolting and equipment assembly that require impact-rated extensions
• Pneumatic and electric impact wrench applications with 1" drive systems

When it may not be suitable

This impact extension is not intended for hand-ratchet or non-impact manual use where the 1" drive size and length would be impractical. It also may be excessive for light domestic tasks or small fasteners where smaller drive sizes and shorter extensions are more appropriate.

Key specifications

• Drive size: 1 inch
• Effective length: 400 mm
• Design: impact-rated extension bar with through-hole for pin or clip retention
• Material: impact-grade steel, heat-treated for toughness
• Intended use: compatible with impact wrenches and powered fastening tools

How to use

Select an appropriate impact socket that matches the fastener and attach it to the 1" drive of the extension bar. Insert the extension onto the impact wrench square drive until fully seated, then align the through-hole and secure the assembly with a suitable retaining pin or clip. Operate the impact wrench according to the tool manufacturer's guidance, applying steady control to avoid side loading. After use, remove the retaining pin, detach the extension and socket, and inspect for wear or deformation before the next use.

What to consider before purchase

• Confirm compatibility with your impact wrench drive size (1") and the sockets you use
• Verify the required length (400 mm) is suitable for reaching the fasteners you work on
• Ensure you have or can obtain an appropriate retaining pin or clip for the through-hole
• Consider the working torque range of your impact wrench to ensure safe operation with a long extension

Usage recommendations

Use the extension only with impact-rated sockets and tools, secure the through-hole with a proper pin or clip, avoid excessive side loads, and inspect the extension regularly for signs of wear or cracking to maintain safe, reliable performance.