Socket 3/8" 6-point 21 mm Proxxon PR23526

Proxxon 3/8" 6-point 21 mm socket is a compact hand tool accessory designed for use with standard 3/8" drive ratchets and handles. The 6-point profile fits hexagonal fasteners securely to minimize rounding and ensure positive engagement. Manufactured for general mechanical repair, maintenance and assembly, this 21 mm socket offers a balance of durability and accessibility for work in confined or recessed areas.

Advantages

The 6-point geometry concentrates force on the flat faces of fasteners, reducing the risk of slipping compared with 12-point designs. Made to industry standards for drive compatibility, the socket provides straightforward interchangeability with common 3/8" drive tools. Its compact length helps reach bolts in tight spaces while maintaining sufficient wall thickness for reliable torque transmission.

Suitable for

• Automotive repair and maintenance where a 21 mm socket is required
• General mechanical assembly and disassembly tasks
• Servicing bicycles, motorcycles, and small machinery with confined access
• Workshop use with 3/8" ratchets, extensions, and breaker bars

Key specifications

• Drive size: 3/8" compatible
• Socket profile: 6-point (hex) design
• Nominal size: 21 mm across flats
• Construction: chrome-plated steel (typical for hand sockets)
• Length: compact profile for access in confined spaces

How to use

Select a 3/8" drive ratchet, handle, or extension compatible with the socket. Push the socket onto the tool's square drive until it engages, then place the socket over the hex fastener and apply steady torque through the ratchet or handle. For stubborn fasteners, use a breaker bar or apply controlled incremental force to avoid rounding the fastener. After use, remove the socket by pulling it off the drive and store in a socket rail or organizer.

Usage recommendations

Use appropriate personal protective equipment and observe torque limits for fasteners. Avoid using impact tools with sockets not specifically rated for impact use; select impact-rated sockets when required.