Guide To CNC Chuck Jaws: Soft Jaws vs. Hard Jaws
soft jaws are more adaptable but wear out faster, while hard jaws are more durable but less flexible for customizing the fit of the workpiece. ...
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4-jaw lathe chucks are available in a wide range of sizes to accommodate different lathes and workpiece requirements. Key dimensions include the diameter of the chuck, mounting hole patterns, and backplate specifications. Below is a summary of commonly available dimensions and typical measurements.
| Chuck Diameter | Typical Applications |
|---|---|
| 80 mm | Mini lathes, small parts |
| 100 mm | Small bench lathes |
| 125 mm | Light to medium-duty work |
| 160 mm | Medium-duty lathes |
| 200 mm | Heavier-duty general machining |
| 250 mm | Industrial, larger lathes |
| 315 mm & up | Heavy-duty, industrial lathes |
| 12–32" (300–810 mm) | Very large, specialized lathes |
4 jaw chucks can range from 80 mm (3") up to 32 inches (810 mm) in diameter, depending on the manufacturer and intended use.
Below are example dimensions for a line of 4-jaw lathe chucks (values in mm unless otherwise noted):
| Ø (Dia.) | E H6 | F | G | H | J | K | O | S | T | R |
|---|---|---|---|---|---|---|---|---|---|---|
| 80 | 63 | 70 | 3xM5 | 35.5 | 13 | 6 | 16.5 | 3 | 46 | 17 |
| 100 | 80 | 90 | 3xM6 | 41.5 | 17 | 8 | 18 | 3 | 52 | 23 |
| 125 | 110 | 110 | 3xM8 | 51.5 | 19 | 8 | 22 | 4 | 58 | 28 |
| 160 | 130 | 143 | 3xM8 | 66 | 23 | 9 | 22 | 4 | 62 | 48 |
| 200 | 162 | 180 | 3xM10 | 74 | 29 | 11 | 27.5 | 5 | 76 | 52 |
| 250 | 210 | 226 | 3xM10 | 97.5 | 33 | 12 | 29.5 | 5 | 87 | 78 |
Additional features may include:
Mounting hole patterns such as 3xM5, 3xM6, 4xM8, etc.
Central through hole and register diameters, which must match spindle specifications.
Chuck height from backplate to face.
Weight varies and may range from ~2 kg (80 mm chuck) up to over 100 kg for larger industrial models.
Reversible Jaws : Most 4-jaw chucks have jaws that can be reversed for inside or outside gripping.
Mounting System : Can include plain back, threaded, or camlock (e.g., D1-6 Camlock).
Material : Typically made from cast iron for general use or forged steel for heavy-duty applications.
Independence : Each jaw is adjusted independently, allowing for oddly shaped workpieces.
Always ensure the chuck diameter matches the swing and spindle nose of your lathe.
Match the hole pattern and register with your backplate or spindle flange.
Check jaw capacity (maximum and minimum gripping diameters).
Consider weight and mounting limitations, especially for bench-top machines.
In summary : 4-jaw lathe chucks come in sizes from 80 mm (3") for mini lathes up to 32" (810 mm) for large industrial lathes, with detailed dimensional specifications depending on the manufacturer and application
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