Impact Socket 12-Point 21mm 1/2-Inch Drive, Chrome-Moly Construction

Brief Overview

This 21mm 12-point impact socket is engineered for high-torque pneumatic impact wrench applications in professional automotive, heavy equipment, and industrial maintenance environments. Manufactured from chrome-molybdenum steel, it delivers superior impact resistance and durability under repetitive shock loads. The 12-point geometry provides faster engagement and disengagement compared to 6-point designs, making it ideal for rapid fastener work. Whether you're stocking core sizes for your shop or building a comprehensive socket set, this socket integrates seamlessly with smaller metric impact sockets and larger capacity variants to cover the full range of fastener demands.

Key Features

• 12-Point (Double-Hex) Design: Faster engagement on fasteners; reduces rounding risk compared to 6-point sockets
• Chrome-Molybdenum Steel Construction: Superior hardness and impact resistance; handles sustained shock loads from pneumatic tools
• 1/2-Inch Square Drive: Compatible with standard 1/2" impact wrenches and ratchets
• Deep Socket Configuration: Extended reach for fasteners set below component surfaces
• Precision Machined Geometry: Tight tolerances ensure proper fit and prevent cam-out
• Industrial-Grade Finish: Matte black surface reduces glare and resists corrosion in workshop environments

Technical Specifications

Parameter	Specification
Socket Size	21mm
Drive Type	1/2-Inch Square Drive
Point Count	12-Point (Double-Hex)
Outer Diameter (D1)	30mm
Outer Diameter (D2)	26mm
Wall Thickness (T)	31mm
Total Length (L)	78mm
Material	Chrome-Molybdenum Steel
Application	Pneumatic Impact Tools
Part Number	545621P

Business Advantages for Resellers

• High Turnover Item: The 21mm size is among the most frequently used metric socket sizes in automotive and heavy equipment service, ensuring consistent demand and quick inventory velocity
• Margin-Friendly Bulk Orders: Pneumatic tool sets require multiple socket sizes; customers typically purchase by the set, creating opportunities for larger order values
• Professional Credibility: Chrome-moly impact sockets are table-stakes for any credible shop tool offering; their absence signals incomplete inventory
• Durability = Customer Retention: Chrome-moly construction outlasts cheaper alternatives, reducing customer complaints and warranty returns
• Cross-Sell Potential: Pair with impact wrenches, extension bars, and complementary socket sizes to increase average transaction value

Why This Socket Matters

Impact sockets differ fundamentally from standard hand-tool sockets. They must absorb repeated shock loads without cracking or deforming. Chrome-molybdenum steel provides the hardness and toughness necessary for this demanding environment. The 12-point geometry accelerates fastener engagement on rounded or damaged studs—a real-world advantage in heavy maintenance where fasteners are often compromised.

The 21mm size covers a critical range of automotive fasteners: suspension bolts, transmission pan bolts, engine block fasteners, and brake caliper mounts. This is a core size; shops without it face job delays.

Call to Value

Stock this socket as part of a professional impact socket system. Its proven design, industrial material specification, and high utilization rate make it an essential inventory item for any serious automotive or industrial tool distributor.