Pioneer ER16-M040 HPI ER16 4mm Bore Spring Collet
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The Pioneer ER16-M040 is a new ER16-series spring collet manufactured to HPI (High Precision Industrial) standards, designed for use in ER16-compatible toolholders on CNC machining centers, milling machines, lathes, and grinding spindles. The part number decodes as follows: "ER16" designates the DIN 6499 / ISO 15488 ER16 collet series with a 17 mm nominal outer taper diameter; "M" denotes metric bore sizing; "040" specifies a 4.0 mm nominal clamping bore diameter. The ER16 series provides a clamping range of 3.0–4.0 mm per collet (1 mm total collapse range per DIN 6499 standard), and this collet's 12-slot construction and precision-ground spring steel body deliver concentricity typically within 0.008 mm TIR. Stamped "05/15" indicating a manufacture date of May 2015, the collet is supplied new in original Pioneer packaging (pioneerna.com) and is a direct-fit replacement for any DIN 6499 ER16 toolholder accepting metric collets.
Product Specifications
| Brand | Pioneer |
| MPN | ER16-M040 |
| Collet Series | ER16 |
| Standard | DIN 6499 / ISO 15488 |
| Bore Sizing System | Metric |
| Nominal Bore Diameter | 4.0 mm |
| Clamping Range | 3.0–4.0 mm |
| Outer Taper Diameter (nominal) | 17 mm |
| Grade / Spec | HPI (High Precision Industrial) |
| Number of Slots | 12 |
| Material | Spring steel (alloy) |
| Manufacture Date | 05/2015 |
| Condition | New |