An Expanding Nut Collet is an internal gripping workholding device that clamps components from the inside diameter. When the nut is tightened, the collet expands uniformly to securely grip the internal bore, making it ideal for bore-based machining applications where external clamping is not possible or preferred.
An Expanding Nut Collet is an internal gripping workholding device designed to clamp components from the inside diameter (ID).
When the nut is tightened, the collet expands uniformly, gripping the internal bore of the component securely.
It is widely used for bore-based machining, where external clamping is not possible or not preferred.
Key Features
📐 Expanding Nut Collet – Dimension Details (Typical)
|
Parameter |
Standard Range |
|
Clamping Method |
Internal Expanding |
|
Bore Diameter Range |
10 – 150 mm |
|
Expansion Range |
0.2 – 1.0 mm |
|
Outer Diameter (OD) |
As per chuck |
|
Overall Length (L) |
As per job |
|
Accuracy (TIR) |
≤ 0.01 – 0.02 mm |
|
Material |
Alloy Steel / Spring Steel |
|
Operation |
Manual / Pneumatic / Hydraulic |
📌 Exact dimensions are manufactured as per component bore and machine requirement.
Construction Details
Types of Expanding Nut Collets
Applications
Advantages vs External Clamping
|
Feature |
Expanding Nut Collet |
External Chuck |
|
Bore-based accuracy |
Excellent |
Limited |
|
OD surface safety |
Perfect |
Jaw marks possible |
|
Concentricity |
Very High |
Medium |
|
Ideal for Rings/Bushes |
Yes |
No |
Supply Options
Have questions about a specific product? Our team will help you find the right option for your needs — ensuring compatibility, quality, and value.
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A W-Series Collet is a high-precision, draw-in type workholding collet commonly used on cylindrical grinders, tool and cutter grinding machines, milling fixtures, and inspection setups. It offers excellent concentricity, high rigidity, and repeatable accuracy, making it ideal for precision grinding and finishing operations.