Key Features
1/2 Inch Drive Built for 1/2 inch drive impact tools, so it matches the size commonly used for tougher automotive and equipment fasteners. Deep 21mm Reach The deep 21 mm socket profile gives you extra reach on longer studs and recessed nuts where a standard socket comes up short. 6-Point Grip DirectTorque technology and a 6-point design help reduce fastener rounding and keep a more secure grip under impact use.
Overview
The DeWalt DWMT73951OSP 1/2-In. (13mm) Drive 6-Point 21mm Metric Deep Impact Socket is an individual deep impact socket made for driving and removing 21 mm fasteners with an impact wrench or other 1/2 inch drive setup. This is a deep impact socket designed for high-torque fastening and removal work. Model Number: DWMT73951OSP.
If you work on suspension hardware, lug-adjacent fasteners, machinery, or any assembly with longer studs, the deep profile matters. It gives you the reach a shallow socket cannot, which means less fighting recessed nuts and less swapping around trying to make the tool fit the job.
DeWalt uses a 6-point opening here, which is the right call for impact work. A 6-point socket puts force on the flats of the fastener instead of chewing up the corners. Paired with DirectTorque technology, this socket is built to help prevent rounding and maintain better grip when torque loads climb.
Jobsite usability is simple but important on a piece like this. The size marking is shown in large font for quicker identification, which saves time when you are sorting through sockets in a drawer, bag, or stacking case. On repetitive fastening work, that small detail matters more than people think.
This DeWalt impact socket is sold as an individual piece, so it makes sense for the user who needs one exact replacement size or wants to fill a gap in an existing socket lineup instead of buying a full set. The official product data identifies it as a 1/2 inch drive, 21 mm, deep, 6-point metric impact socket with a one-piece count.
Who should buy it? Mechanics, equipment techs, general contractors, farm and fleet users, and serious DIYers who already run impact tools and need a dedicated 21 mm metric deep socket. If that is a common size in your work, buying the single DeWalt DWMT73951OSP 1/2-In. (13mm) Drive 6-Point 21mm Metric Deep Impact Socket is a practical way to get the exact fit you need without paying for extra pieces you will not use.
Built to Reach Recessed Fasteners
The DeWalt DWMT73951OSP deep impact socket is made for the situations where a standard socket will not reach far enough. That extra depth is what makes it useful on longer studs, recessed hardware, and tighter access points where you still need full engagement on the fastener.
- 1/2 inch drive fits common impact wrench setups
- 21 mm metric size targets a specific, frequently used fastener size
- Deep socket format helps on extended-thread and recessed applications
What’s in the Box
- (1) DeWalt 6-Point 1/2 Inch Drive Deep Impact Socket, 21 mm
Key Specifications
| Product Type | Impact Socket |
|---|---|
| Drive Size | 1/2 in |
| Socket Size | 21 mm |
| Point Type | 6-Point |
| Socket Depth | Deep |
| Measurement System | Metric |
| Individual or Set | Individual |
| Piece Count | 1 |
Built For
Automotive Equipment Maintenance General Contracting Mechanical Fastening Garage Work DIY / Hobbyist
Warranty & Support
3 Year Warranty.
Tool Nut’s Take
Tool Nut’s Take
DeWalt DWMT73951OSP 1/2-In. (13mm) Drive 6-Point 21mm Metric Deep Impact Socket Gets Straight to the Point
If 21 mm is a size you actually use, this is the kind of single deep impact socket worth keeping in the drawer because it does the job without drama.
- Who it’s for: Anyone running a 1/2 inch drive impact setup for automotive, equipment, or general fastening work and needing a dedicated 21 mm deep socket.
- Why it stands out: The deep profile, 6-point fit, and DirectTorque design are the features that matter here. Better reach, better grip, and less chance of beating up fastener corners.
- Worth knowing: This is one individual socket, not a set. That is great if you are replacing a lost size or filling a gap, but make sure 21 mm is the exact size you need.
Common Questions
- What size drive does this socket use? It uses a 1/2 inch drive.
- Is this a shallow or deep socket? This is a deep impact socket.
- What fastener size is it made for? It is made for 21 mm metric fasteners.
- Is it sold as part of a set? No. The official specification lists it as an individual socket with a piece count of 1.
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