Precision Collet: Capacity Range 1-32mm diameter

Component Specifications

Definition

A precision collet is a mechanical component designed for high-accuracy clamping applications in machining operations. It consists of a tapered sleeve with longitudinal slits that compress uniformly when drawn into a matching tapered socket, creating a precise, concentric grip on cylindrical objects. Used primarily in precision rotary chucks, lathes, milling machines, and CNC equipment, it ensures minimal runout and maximum gripping force for delicate machining operations requiring micron-level tolerances.

Working Principle

The collet operates on the principle of elastic deformation through tapered compression. When the collet is pulled into a matching tapered receptacle (collet chuck), the slitted segments compress radially inward, applying uniform pressure around the workpiece circumference. This creates a self-centering clamping action that maintains concentricity within 0.005mm or better, while the taper angle (typically 5-8 degrees) provides mechanical advantage for high gripping force.

Materials

Medium-carbon alloy steel (AISI 4140/4340, Cr-Mo grades at about 0.40-0.43% C), alloy steel (SCM440), stainless steel (AISI 304/316), or carbide-tipped for wear resistance. Hardness: 45-60 HRC. Surface treatments: Nitriding, TiN/TiCN coating, or chrome plating for corrosion resistance and reduced friction.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Collet Type	ER, TG, DA, RDO, 5C
Taper Angle	8 degrees (ER standard)
Capacity Range	1-32mm diameter
Gripping Force	200-1500N depending on size
Operating Speed	Up to 25,000 RPM (balanced)
Runout Tolerance	≤0.005mm at 3xD
Temperature Range	-20°C to 120°C

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, JIS B 6339

Parent Products

This component is used in the following industrial products

Precision Rotary Chuck

A high-precision rotating clamping device used to securely hold and precisely position optical lenses during centering and machining operations.

View Product Details

Engineering Analysis

Risks & Mitigation

Over-tightening causing collet fracture
Contamination leading to inaccurate clamping
Worn tapers causing excessive runout
Thermal expansion affecting grip accuracy
Incorrect collet-nut torque causing slippage

FMEA Triads

Trigger: Excessive tightening torque
Failure: Collet cracking or permanent deformation
Mitigation: Use torque wrench according to manufacturer specifications (typically 50-120 Nm for ER collets)

Trigger: Chips or debris in collet bore
Failure: Poor concentricity and workpiece damage
Mitigation: Implement regular cleaning protocol and use chip guards

Trigger: Worn collet nut threads
Failure: Insufficient clamping force and tool slippage
Mitigation: Replace collet nuts after 500-1000 cycles or when thread wear exceeds 0.1mm

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 2768-mK for general dimensions, ISO 286 for bore tolerances (typically H6/H7)

Test Method

Runout measurement per ISO 230-1 using test mandrel, gripping force test with hydraulic/pneumatic load cell, concentricity verification with dial indicator or laser alignment

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 Precision Collet

Manufacturer profiles associated with Precision Collet.

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Frequently Asked Questions

What is the difference between ER and TG collets?

ER collets have an 8-degree taper and are versatile for both tool and workpiece holding with good gripping range. TG collets have a steeper 16-degree taper providing higher rigidity and accuracy for specific CNC applications but with less size flexibility.

How often should precision collets be inspected?

Inspect for wear, cracks, and cleanliness every 40-80 hours of operation. Replace if runout exceeds 0.01mm or if visible damage is present. Regular cleaning with solvent and light lubrication extends service life.

Can precision collets hold non-cylindrical workpieces?

Standard collets are designed for cylindrical shapes. Special collets with custom bore profiles (hexagonal, square) are available but require precise matching to workpiece dimensions and typically have reduced gripping range.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Precision Collet