Socket 1/2" Topex 21 mm, 6-point (38D721)

1/2" Topex 21 mm 6-point socket (model 38D721) is a hand tool accessory intended for use with 1/2-inch drive ratchets and handles. The six-point design delivers secure engagement with hex fasteners, reducing the risk of rounding and allowing reliable torque transfer for common automotive, maintenance and assembly tasks that call for a 21 mm socket size. The socket is designed for frequent mechanical use and offers a straightforward solution for tightening and loosening bolts and nuts with a 21 mm head.

Advantages

The six-point configuration provides maximum surface contact on fastener flats, which helps prevent slipping and rounding under load. The 1/2" drive interface ensures compatibility with a wide range of ratchets and breaker bars, making the socket suitable for both light and heavy-duty work. Durable construction and a compact form factor make it easy to store in tool kits and use in confined spaces.

Suitable for

• Automotive repair and wheel or suspension work requiring a 21 mm socket
• Mechanical assembly and disassembly of machinery with 21 mm hex fasteners
• General maintenance tasks in workshops and garages
• Field service and mobile tool kits where a reliable 21 mm socket is needed

Key specifications

• Drive size: 1/2 inch
• Socket size: 21 mm
• Point configuration: 6-point (hex)
• Typical use: manual ratchet and breaker bar applications
• Form factor: short/standard length suitable for confined spaces

How to use

Select the 1/2" drive ratchet or handle compatible with the socket, push the socket onto the ratchet square drive until it locks, place the socket over the 21 mm hex fastener and apply steady torque in the required direction. For tight or seized fasteners, use a breaker bar with controlled force and avoid sudden impact that could damage the fastener or socket. After use, wipe the socket clean of grease and debris and store in a socket rail or toolbox to protect the drive fitting.

Usage recommendations

Use the socket with appropriately rated tools, avoid excessive impact or misuse, and regularly inspect the socket for wear or rounding. For high-torque or impact applications, select tools and sockets specifically rated for impact use; this socket is intended for manual ratchet and breaker bar work.