Universal Tool Grinder Collets
Precision 355E / L20 collets for universal tool and cutter grinders, available with standard and custom precision-ground bores. Designed for reliable tool holding in cutter grinding, regrinding, and special tooling applications.
355E / L20 Collet Dimensions & Custom Bore Capability
PRONIXT 355E / L20 universal tool grinder collets combine standard interface dimensions with custom precision-ground bore options for tool grinding, regrinding, and special tooling applications.
Standard Dimensions
Key reference dimensions for the standard 355E / L20 collet body.
| Overall length | 122 mm |
|---|---|
| Head diameter | 28 mm |
| Cylindrical section | 20 mm |
| Threaded section | 25 mm |
| Thread specification | M20×2 |
| Slot width | 3 mm |
| Thread profile | 45° / 5° |
Custom Precision-Ground Bores
Standard, decimal, and special bore diameters can be produced according to the specified tool shank size, customer drawing, or sample. Bore tolerance and inspection requirements are confirmed according to the requested diameter and application.
Controlled Collet Runout
TIR: 0.008–0.010 mmCollet runout can be controlled within this range under PRONIXT inspection conditions to support stable and repeatable tool holding during precision grinding and regrinding.
Collet Runout Inspection
This video shows the dial-indicator inspection procedure used to check radial runout on a test mandrel held by the collet. The inspection helps verify bore grinding and clamping consistency before shipment.
Custom bore size and runout requirements should be confirmed before production so that the appropriate grinding and inspection method can be applied.
Final machine-side runout may also be affected by spindle condition, mating surfaces, the draw-in mechanism, installation, and measurement conditions.
Need a Custom 355E / L20 Collet?
Send us the required bore diameter, tool shank size, runout requirement, quantity, and machine information. Drawings, samples, or existing collet specifications are also welcome for technical evaluation and custom precision grinding.