ER collets for micro-diameter tools provide precision clamping for small-shank cutting tools in compatible ER toolholders. Selection depends on the ER series, nominal bore diameter, clamping range, and required runout. Standard and micro-bore configurations can be specified for micro-drilling, micro-milling, and precision component machining. Custom dimensions can be reviewed against tool shank requirements and approved drawings.
Product Range & Specifications
Standard and Micro-Bore Sizes
|
Parameter |
ER8 |
ER11 |
ER16 |
|
Nominal series size |
8 mm |
11 mm |
16 mm |
|
Reference outer diameter |
8.5 mm |
11.5 mm |
17 mm |
|
Reference overall length |
13.5 mm |
18 mm |
27.5 mm |
|
Typical standard bore range |
1–5 mm |
1–7 mm |
1–10 mm |
|
Micro-bore size examples |
0.2–0.9 mm |
0.2–0.9 mm |
0.2–0.9 mm |
|
Micro-bore increment example |
0.1 mm |
0.1 mm |
0.1 mm |
Runout Specification
Specify total indicated runout (TIR), test mandrel diameter, measurement position, and test conditions. Confirm the applicable accuracy requirement for the selected collet.
Key Advantages
Small-Bore Compatibility
Micro-bore configurations accommodate small tool shanks when the bore and clamping range match the specified diameter.
Controlled Contact Geometry
The internal bore and external taper work with the mating holder to establish tool alignment. Correct seating and clean contact surfaces support repeatable setup.
Defined Accuracy Requirements
Runout specifications help establish measurable acceptance criteria. The required value should reflect tool diameter, overhang, spindle conditions, and machining tolerance.
Standard and Custom Configurations
Standard sizes support routine tooling requirements. Drawing-based options can be evaluated for dedicated applications and repeat production.
Applications
Micro-Drilling
Suitable configurations support small-diameter drilling operations where tool alignment and hole accuracy are important.
Micro-Milling
Applicable to small end mills used for narrow slots, fine profiles, and detailed component features.
Precision Components
Potential applications include miniature mechanical parts, instrument components, and electronic hardware requiring small cutting tools.
Repeat Machining
Consistent collet specifications help standardize recurring tool setups. The holder, collet, nut, and cutting tool should be evaluated as an assembled system.
How to Select the Right Collet
Match the ER Series
Confirm the holder designation and mating taper before selecting the collet.
Specify the Tool Shank
Provide the actual shank diameter and unit system. Verify the nominal bore and permitted clamping range for the exact model.
Define the Runout Target
State the TIR limit, test mandrel, and measurement position. For tight machining tolerances, assess the complete toolholding assembly.
Confirm Operating Conditions
Provide spindle speed, tool overhang, workpiece material, and machining operation when application review is required.
Materials & Manufacturing Control
Material Specification
Spring steel is commonly used for ER collets. Confirm the actual material grade, hardness, and heat-treatment requirements for the selected configuration.
Precision Grinding
The bore and mating surfaces require dimensional control to support correct seating and tool alignment. Critical tolerances should be defined in the approved drawing.
Heat Treatment
Hardness and dimensional stability should be verified against the specified material and process requirements.
Customization Options
Special Bore Diameters
Custom bore sizes can be assessed against the tool shank diameter, tolerance, and required clamping range.
Drawing-Based Production
Provide a dimensioned drawing covering critical diameters, overall length, interface geometry, and tolerances.
Inspection Requirements
Define critical dimensions, TIR limits, measurement methods, and required inspection documents before order confirmation.
Quality Inspection & Order Consistency
Dimensional Verification
Check critical bore dimensions and mating interfaces against the approved drawing.
Runout Testing
Specify the test mandrel, measurement position, and acceptance limit to establish consistent inspection criteria.
Batch Documentation
Agree on batch identification and inspection records where traceability is required for incoming inspection and repeat orders.
Ordering Information
Standard Orders
Provide the ER series, bore diameter, size system, and order quantity.
Custom Orders
Include the drawing, tool shank diameter, target TIR, material requirements, and inspection criteria.
Commercial Details
Confirm pricing, minimum order quantity, lead time, packaging, and shipping arrangements against the selected configuration.
Frequently Asked Questions
Q: Which ER series suits micro-diameter tools?
A: Start with the ER series specified for the existing holder, then verify the bore size and required accuracy.
Q: Are sub-1 mm bores available?
A: Micro-bore configurations may be available in selected series. Confirm the exact diameter, increment, and tolerance before ordering.
Q: Can one collet hold different tool diameters?
A: Only within its specified clamping range. Check the permitted range for the exact model.
Q: How should runout accuracy be specified?
A: Provide the TIR limit, test mandrel diameter, measurement position, and test conditions.
Q: Can custom ER collets be made to a drawing?
A: Submit the drawing, required bore diameter, mating series, tolerances, and inspection requirements for technical review.
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