Large-Diameter Machine-Your-Own 5C Collets
Also known as step collets, their wide head can be machined to hold large workpieces that won't fit in a standard collet. They have external threads.
| Head Dia. | Head Thick. | Max. Bore Dia. | Body Dia. | Overall Lg. | Face Pilot Hole Dia. | External Thread Size  | Material | Head Material | Each | |
| 2" | 1 3/16" | 1 1/2" | 1 1/4" | 4 33/64" | 1/2" | 1.238"-20 | Hardened Steel | Steel | 0000000 | 000000 |
| 3" | 1 3/16" | 2 1/2" | 1 1/4" | 4 33/64" | 1/2" | 1.238"-20 | Hardened Steel | Steel | 0000000 | 00000 |
| 4" | 1 3/16" | 3 1/2" | 1 1/4" | 4 33/64" | 1/2" | 1.238"-20 | Hardened Steel | Steel | 0000000 | 000000 |
| 5" | 1 3/16" | 4 1/2" | 1 1/4" | 4 33/64" | 1/2" | 1.238"-20 | Hardened Steel | Steel | 0000000 | 000000 |
| 6" | 1 3/16" | 5 1/2" | 1 1/4" | 4 33/64" | 1/2" | 1.238"-20 | Hardened Steel | Steel | 0000000 | 000000 |