Collet: Nominal Diameter e.g., ER-16, ER-32

Q: What is the difference between ER and TG collets?

ER collets have an 8° taper and are versatile with a wide clamping range, commonly used in general machining. TG collets have a steeper 15° taper, offering higher gripping force and rigidity, often used in high-precision or heavy-duty applications.

Q: How do I select the right collet size?

Match the collet nominal size (e.g., ER-32) to your tool holder, and ensure the tool shank diameter falls within the collet's clamping range. Always use a collet that closely matches the tool diameter for optimal grip and minimal runout.

Component Specifications

Definition

A collet is a cylindrical sleeve with a tapered outer surface and a split inner surface that compresses uniformly when tightened, creating a precise and secure grip on cylindrical tools or workpieces. It functions as an interface between the tool holder and the cutting tool, ensuring accurate concentricity and minimal runout during machining operations.

Working Principle

The collet operates on the principle of elastic deformation. When inserted into a matching tapered bore of a collet chuck or tool holder and tightened (typically via a drawbar or nut), the tapered surface forces the split segments of the collet to contract uniformly. This radial compression grips the tool or workpiece with high clamping force and excellent concentricity, minimizing vibration and ensuring precise machining.

Materials

Typically made from high-strength alloy steel (e.g., AISI 4140, 4340) or tool steel, often heat-treated to HRC 45-50 for durability. Some precision collets use spring steel or carbide for specialized applications. Surface treatments like nitriding or chrome plating may be applied to enhance wear resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Collet Type	ER, TG, DA, RDO, etc.
Maximum RPM	Varies by type, e.g., up to 25,000 RPM for balanced collets
Taper Angle	e.g., 8° for ER collets
Clamping Range	e.g., 1-7 mm for ER-16
Nominal Diameter	e.g., ER-16, ER-32
Runout Tolerance	Typically <0.005 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 15488, DIN 6499

Parent Products

This component is used in the following industrial products

Tool Holder / Collet Chuck

A precision clamping device that securely holds cutting tools in machine tool spindles.

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Engineering Analysis

Risks & Mitigation

Incorrect collet selection leading to tool slippage or breakage
Over-tightening causing collet deformation or reduced lifespan
Runout due to wear or contamination affecting machining accuracy

FMEA Triads

Trigger: Wear or damage to collet taper or split segments
Failure: Reduced clamping force, tool slippage, or excessive runout
Mitigation: Regular inspection and replacement of worn collets; proper cleaning and maintenance

Trigger: Using a collet outside its specified clamping range
Failure: Poor concentricity, vibration, or tool damage
Mitigation: Always select collets matching the tool diameter; avoid over- or under-sizing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Runout tolerance typically within 0.005 mm per ISO standards; dimensional accuracy per ISO 15488

Test Method

Runout measured with dial indicators or laser alignment tools; clamping force tested with torque wrenches and pull-out tests

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Collet

Manufacturer profiles associated with Collet.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between ER and TG collets?