Socket bit 3/4" 21 mm (6-point) — JCB

Impact socket bit for 3/4" drive, 21 mm size, 6-point (hexagonal) design by JCB. This socket bit is engineered for use with impact wrenches and torque tools that accept a 3/4" square drive and is intended to provide secure engagement with hex fasteners in automotive, industrial maintenance, and heavy-duty repair applications. The 6-point profile reduces rounding of fastener corners and ensures efficient torque transmission for demanding tasks.

Advantages

The socket bit combines a hardened alloy construction and an impact-rated finish to withstand repeated high-torque cycles. Its 6-point geometry offers concentrated contact with fastener flats to lower the risk of slipping and rounding under load. Precision-machined fit and dimensional stability ensure consistent performance with compatible 3/4" drive impact tools, while the 21 mm size covers a common range of nuts and bolts in vehicle and equipment maintenance.

Suitable for

• Automotive wheel and suspension fasteners
• Heavy equipment maintenance and repair
• Industrial assembly and disassembly operations
• High-torque fastening tasks with impact wrenches

Key specifications

• Drive: 3/4" square drive
• Size: 21 mm
• Profile: 6-point (hexagonal)
• Material: impact-rated hardened alloy steel
• Finish: impact-resistant coating

How to use

Select the 21 mm 6-point socket and securely attach it to a compatible 3/4" drive impact wrench or torque tool. Ensure the tool is set to appropriate torque or impact settings for the fastener and application. Position the socket squarely on the hex fastener, apply steady pressure, and operate the impact wrench while maintaining alignment to avoid slippage. After use, inspect the socket for wear or deformation and store it in a dry, organized tool set.

Usage recommendations

Use this impact socket with tools rated for 3/4" drives and follow manufacturer torque limits for both the tool and the fasteners. Avoid using the socket on rounded or damaged fasteners to prevent further damage and reduce the risk of tool or fastener failure. Regularly check the socket for signs of cracking, excessive wear, or loss of hex profile and replace if any damage is detected.