Apex cds51n 3/8 Drive 12PT Metric Socket 21mm

Product Description

The APEX cds51n is a 3/8 inch drive, 12-point standard metric socket sized at 21mm, built for professional trade use in mechanical, automotive, and industrial service applications. Constructed from Crestoloy alloy steel, the socket delivers high torsional strength under heavy torque loads. An off-corner loading design contacts the flat of the fastener rather than the corner, reducing the risk of rounding fastener heads during high-torque applications. The nickel chrome plating resists corrosion and provides a durable, long-lasting finish. This socket meets or exceeds ASME performance requirements, making it a reliable choice for licensed mechanics and trade professionals working in demanding conditions.

The cds51n is suited for use in automotive repair, equipment maintenance, and general mechanical service where a 3/8 inch drive, 21mm metric fastener is encountered. It is appropriate for both shop and field use where standard-depth metric sockets are required. Trade professionals in HVAC, plumbing, and general mechanical service will find this socket useful for equipment fasteners that call for a mid-size metric drive.

Key Features

• 3/8 inch drive accepts standard 3/8 inch ratchets, extensions, and drive tools
• 21mm 12-point metric sizing for broad fastener compatibility
• Off-corner loading design reduces fastener rounding under torque
• Crestoloy alloy steel construction for strength and durability
• Nickel chrome plated finish for corrosion resistance and long service life
• Meets or exceeds ASME requirements for socket performance

Compatibility

Designed as a standard 3/8 inch drive 12-point metric socket compatible with 3/8 inch drive ratchets, torque wrenches, and extension bars from major tool manufacturers.

Installation Notes

Installation and removal of fasteners with this socket should be performed with a properly rated 3/8 inch drive ratchet or torque wrench. Always confirm the socket seats fully on the fastener before applying torque to avoid slippage or fastener damage. Inspect the socket for cracks or wear before each use and replace if deformation is observed.

Technical Specifications

• Drive Size: 3/8 inch
• Socket Size: 21mm
• Point Count: 12-point
• Socket Type: Standard depth
• Measurement System: Metric
• Material: Crestoloy alloy steel
• Finish: Nickel chrome plated
• Standard: Meets or exceeds ASME requirements

Standard Information

• Brand: APEX
• Manufacturer Part Number: cds51n