A W-Series Collet is a high-precision, draw-in type work-holding collet widely used on cylindrical grinding machines, tool & cutter grinders, milling fixtures, and inspection setups.
It provides excellent concentricity, rigidity, and repeatability, making it ideal for grinding and finishing operations.
🔹 KEY FEATURES
- Very high concentricity (low TIR)
- Strong, rigid draw-in clamping
- Ideal for grinding & finishing
- Long life with hardened & ground finish
- Interchangeable with standard W-series chucks
📐 W-SERIES COLLET – STANDARD DIMENSION TABLE
|
W Size
|
Length (L) mm
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Max Holding Capacity (mm)
|
Typical Use
|
|
W12
|
32
|
12
|
Small precision parts
|
|
W16
|
40
|
16
|
Tool room jobs
|
|
W20
|
50
|
20
|
Cylindrical grinding
|
|
W25
|
58
|
25
|
Medium grinding work
|
|
W32
|
70
|
32
|
Heavy grinding
|
|
W40
|
85
|
40
|
Large diameter jobs
|
📌 Each W collet generally holds one exact size (tight tolerance), not a wide range like ER.
🧩 CONSTRUCTION DETAILS

- Material: Spring Steel / Alloy Steel
- Heat Treatment: Hardened & tempered
- Hardness: 58 HRC
- Finish: Precision ground ID & OD
- Slots: Uniform precision slits for even clamping
⚙️ TYPES OF W-SERIES COLLETS
- Standard round W collet
- Step W collet
- Emergency (soft machinable) W collet
- Special profile W collet (as per job)
🏭 APPLICATIONS
- Cylindrical grinding machines
- Tool & cutter grinders
- Milling & inspection fixtures
- Precision shafts, pins & tools
- Tool rooms & production grinding
📦 SUPPLY OPTIONS
- Sizes: W12 to W40 (standard)
- Metric & inch bores
- Hardened or soft (machinable)
- Custom bore & tolerance as per drawing
- Export-quality