Proline Socket Key 1/2" 6-point 21mm (MPN 9017784) - workshop socket for 1/2-inch drive

Proline 1/2" 6-point 21 mm socket (MPN 9017784) is a workshop socket designed for use with 1/2-inch drive ratchets and breakers. Made from chrome-vanadium steel and subjected to precise hardening and tempering processes, this 21 mm socket meets high durability standards and provides a reliable fit for 21 mm fasteners in mechanical and automotive maintenance tasks.

Advantages

The socket is manufactured from chrome-vanadium steel and heat-treated to ensure appropriate hardness and strength. Its 6-point profile reduces the risk of rounding fastener corners, and the specially profiled contact edges incorporate the PRO-DRIVE system to minimize concentrated point loads and protect the fastener head and flat edges from excessive wear.

Suitable for

• Mechanical repairs and general workshop maintenance
• Automotive maintenance and servicing
• Tasks requiring a 21 mm 6-point socket with 1/2" drive

Key specifications

• Brand: Proline
• Model / MPN: 9017784
• Drive size: 1/2" (12.7 mm)
• Profile: 6-point
• Socket size: 21 mm
• Material: Chrome-vanadium steel
• EAN: 4750959017784

How to use

Attach the 21 mm socket to a compatible 1/2" drive ratchet or breaker bar. Engage the socket fully onto the fastener head before applying torque. Use steady, controlled force to avoid sudden impacts; when loosening tight fasteners, apply a gradual, increasing torque until the fastener turns. After use, inspect the socket for wear and store in a dry toolbox to prevent corrosion.

Usage recommendations

For best results, pair this 6-point 21 mm socket with tools that match the 1/2" drive size and avoid using damaged or rounded fasteners. Do not exceed the rated capacity of your drive tool, and perform regular inspections to ensure socket integrity.