Socket, impact deep 3/4" 42 mm (12-point) JCB

Deep impact socket for 3/4" drive, 42 mm diameter, 12-point configuration from JCB. Designed for use with impact wrenches and heavy-duty torque applications, the deep profile provides access to recessed nuts, long studs and fasteners seated on extended threads. Constructed for repeated impact loading, the socket balances strength and fit accuracy to reduce rounding of fastener corners while enabling high-torque operations in automotive, construction and industrial maintenance environments.

Advantages

The JCB deep impact socket features a 12-point geometry that permits quick engagement with hex-head and 12-point fasteners and is particularly useful when space for swing is limited. Its deep profile allows reaching fasteners on long studs without removing surrounding components. Engineered for impact use, the socket is manufactured to withstand shock loading from pneumatic and electric impact tools while maintaining durable internal surfaces for secure contact with fasteners.

Suitable for

• Removal and installation of large nuts and bolts with a 42 mm head
• Use with 3/4" drive impact wrenches and torque tools
• Maintenance on heavy vehicles, construction equipment and industrial machinery
• Operations requiring access to recessed or long-stud fasteners

Key specifications

• Drive size: 3/4"
• Socket width across flats: 42 mm
• Point design: 12-point
• Profile: deep (extended length)
• Intended use: impact-rated for pneumatic and electric impact tools
• Material and finish: engineered for impact durability and corrosion resistance (manufacturer-specified materials)

How to use

Select the socket to match the fastener size (42 mm). Attach securely to a compatible 3/4" drive impact wrench or torque tool, ensuring the retaining mechanism (pin/retainer) on the tool is engaged if applicable. Place the socket fully over the fastener head before applying torque. When loosening, start at lower torque settings if possible to break rusted or seized joints, then increase as needed. When tightening, follow the required torque specifications for the fastener and application. After use, inspect the socket for wear, cracks or deformation and remove from service if damage is detected.

Usage recommendations

Use only with tools and accessories rated for impact service. Avoid using impact sockets with hand ratchets or cheater bars for torque values beyond their hand-tool ratings. Store in a dry place and periodically check for wear to ensure safe performance in high-torque applications.