Standards
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
12-Point Socket Sizes (Metric and Inch)
Common 12-point socket sizes used in aerospace, motorsport, and general automotive applications.
Metric Sizes
| Size | Common application |
|---|---|
| 8 mm | Small fasteners, motorsport accessory |
| 10 mm | General automotive |
| 12 mm | General automotive |
| 14 mm (thin-wall spark plug) | Modern engine spark plug removal |
| 17 mm, 19 mm, 21 mm | Wheel lug, suspension |
| 24 mm, 30 mm, 36 mm | Heavy-duty truck, diesel head bolts |
Inch Sizes
| Size | Common application |
|---|---|
| 1/4 inch | Small fasteners |
| 5/16 inch, 3/8 inch | Aerospace structural |
| 7/16 inch, 1/2 inch, 9/16 inch | Aerospace structural + automotive |
| 5/8 inch, 3/4 inch, 1 inch | Heavy structural + truck |
| 1-1/4 inch | Heavy industrial |
Common 12-point socket sizes
Most 12-point sockets are sold in metric (8 mm to 32 mm in 1mm increments) and SAE inch (1/4 inch to 1-1/4 inch in standard automotive increments). Common sizes per drive system: 1/4-inch drive carries 8 mm to 14 mm sockets for trim and small-bracket fastening, 3/8-inch drive carries 10 mm to 22 mm for general automotive, and 1/2-inch drive carries 13 mm to 32 mm for engine and structural service. Spark-plug specific 14 mm and 16 mm thin-wall variants drop into 1/2-inch drive deep sockets.
For the bolt that the socket drives, see 12-point fastener catalog, flange variants, head bolts, cap screws, UNJ-3A dimensional reference. The 12-point socket clarification page covers the wider tool-vs-bolt question. The 6-point comparison: 12-point vs 6-point socket.
Standard size coverage by drive
Common 12-point socket sizing follows the bolt-head across-flats dimension. Metric: 8mm to 32mm in 1mm increments, with 14mm and 16mm thin-wall variants for spark plugs. Inch: 1/4 to 1-1/4 inch in standard automotive increments, occasionally with shallow and deep socket depth options for valve cover, exhaust manifold, and engine bay clearance. The 1/2-inch drive size handles head-bolt and main-cap-bolt service across most engine families; the 3/4-inch drive size handles structural and wheel-stud applications.
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