Williams Comfort Products STM-1221 1/2 in Drive Socket 12-pt 21MM

Product Description

The Williams Comfort Products STM-1221 is a 1/2 inch drive regular socket with a 12-point configuration sized at 21 millimeters. Built for professional use, this socket delivers reliable torque transfer on fasteners commonly encountered in HVAC, plumbing, and general mechanical service work. The 12-point design engages hex and square fasteners from multiple approach angles, which is useful in tight or awkward install locations. At 0.21 pounds, it is lightweight enough for sustained overhead or confined-space work without adding unnecessary fatigue.

This socket is suited for residential and commercial trade work where a 21 mm fastener size is standard. HVAC technicians, plumbers, and general mechanical contractors will find it useful when servicing equipment mounting hardware, flanged connections, and structural fasteners that fall in the metric range. It is sold individually, making it a practical replacement or addition to an existing socket set.

Key Features

• 1/2 inch drive size for compatibility with standard ratchets and breaker bars
• 12-point socket profile allows engagement from multiple angles in restricted spaces
• 21 millimeter opening fits common metric fasteners used in mechanical and HVAC equipment
• Lightweight at 0.21 pounds for reduced fatigue during extended service work
• Sold as a single unit for targeted replacement or set expansion

Compatibility

Designed as an OEM-style replacement socket compatible with standard 1/2 inch drive ratchets, extensions, and torque wrenches used in professional trade applications.

Installation Notes

This socket is used by licensed HVAC technicians, plumbers, electricians, and mechanical contractors during equipment installation and service. Always power down or shut off the relevant system before using hand tools on fasteners tied to electrical, gas, or pressurized components. Inspect the socket for wear or cracks before each use and replace if the drive opening shows signs of rounding or deformation. Pair with a calibrated torque wrench when fastener torque specifications are provided by the equipment manufacturer.

Technical Specifications

• Drive Size: 1/2 inch
• Point Configuration: 12-point
• Socket Size: 21 millimeters
• Weight: 0.21 pounds
• UPC: 0662459222213
• Sold As: Each

Standard Information

• Brand: Williams Comfort Products
• Manufacturer Part Number: STM-1221