21mm Deep Impact Socket, 3/4" Drive, 6-Point, 90mm Length
Heavy-duty 21mm impact socket for 3/4" drive tools. 6-point design, deep reach, alloy steel construction for industrial fastening applications.
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21mm Deep Impact Socket, 3/4" Drive, 6-Point
Brief Overview
This 21mm deep impact socket is engineered for professional automotive and industrial shops requiring reliable fastening solutions on medium-sized fasteners. The 3/4" square drive connects to all standard impact wrenches, air ratchets, and breaker bars in that class. The 6-point design provides secure engagement with minimal risk of rounding, making it ideal for stubborn or corroded fasteners. Part of a comprehensive range that includes 19mm deep impact sockets and 24mm variants for complete fastening coverage.
Key Features
- 6-Point Hex Profile: Distributes force across six contact points, reducing cam-out and fastener damage
- Deep Reach Design: 90mm overall length allows access to recessed or hard-to-reach fasteners (typical for suspension, engine block, and frame work)
- 3/4" Square Drive: Standard heavy-duty drive size compatible with impact wrenches rated 400+ ft-lbs
- Impact-Rated Alloy Steel: Forged construction with black oxide finish resists corrosion and absorbs shock loads
- Retaining Groove: Integrated safety groove prevents accidental socket ejection during operation
- Industrial Black Finish: Durable matte coating protects against rust and provides professional appearance
Why This Socket Works for Your Business
Demand-Driven Size: The 21mm size addresses a critical fastener gap in medium-duty automotive work—common on European vehicle components, suspension bolts, and engine fasteners. This drives repeat orders.
Durability = Margin: Impact-rated alloy steel construction withstands continuous pneumatic tool use without fracture or deformation. You'll see fewer returns and warranty claims compared to standard chrome sockets.
Deep Length = Competitive Edge: At 90mm, this socket reaches fasteners where shallow sockets fail, reducing customer callbacks and positioning your shop as solution-oriented.
Professional Consistency: Black oxide finish and heavy-duty profile signal quality to your customers, supporting premium pricing and brand perception.
Technical Specifications
| Parameter | Value |
|---|---|
| Socket Size (mm) | 21 |
| Drive Size | 3/4" Square |
| Point Count | 6-Point (Hex) |
| Overall Length (mm) | 90 |
| Hex Width Across Flats (D1, mm) | 35 |
| Hex Width Across Points (D2, mm) | 44 |
| Wall Thickness (T, mm) | 26 |
| Material | Forged Alloy Steel |
| Finish | Black Oxide (Impact-Rated) |
| Part Number | 546621P |
| Retaining Feature | Safety Groove |
Ideal Applications
- Suspension and steering component fastening
- Engine block and cylinder head bolt removal/installation
- Transmission pan fasteners
- Brake system work on medium-sized bolts
- European automotive repair (where 21mm is standard)
- Industrial equipment maintenance
Stock and Resale Advantage
This socket is part of an established metric range spanning 17mm to 65mm, allowing you to build customer confidence through consistent quality and availability. High-volume shops will rotate through the entire range seasonally, creating predictable demand and margin opportunity.
Order this socket as part of a complete 3/4" drive impact set to maximize customer attachment value and reduce your logistics costs per unit.