High-precision ER collets hold cylindrical-shank cutting tools in compatible ER collet chucks. Available in multiple series and bore sizes, they support CNC milling, drilling, reaming, and other machining operations requiring controlled tool positioning. Selection depends on holder compatibility, tool shank diameter, runout requirements, and machining conditions. Standard sizes and customized specifications can be reviewed against drawings, samples, and application requirements.
Product Specifications
|
Parameter |
Reference Specification |
|
Product type |
ER spring collet |
|
ER series |
ER8, ER11, ER16, ER20, ER25, ER32, ER40 |
|
Outside diameter |
8.5–41 mm |
|
Overall length |
13.5–46 mm |
|
Bore range across listed series |
1–26 mm |
|
Reference taper angle |
8° |
|
Size system |
Metric; inch sizes subject to availability |
|
Dimensional standard |
DIN 6499 / ISO 15488 compatibility to be confirmed |
|
Runout tolerance |
Confirm by precision grade and inspection method |
|
Material and hardness |
Confirm against the approved specification |
Key Product Advantages
Defined Precision Requirements
Specify the required total indicated runout (TIR), test mandrel diameter, and measurement position to establish a consistent basis for precision evaluation.
Multiple Bore Sizes
Different ER series accommodate different tool diameters. Selecting the correct nominal bore and permitted reduction range helps establish the required clamping fit.
Repeatable Tool Setup
Correct matching of the collet, nut, holder, and tool shank supports consistent clamping conditions during tool changes and repeat machining operations.
Specification Control
Part numbers, approved drawings, and agreed inspection criteria provide a clear reference for repeat orders and incoming quality checks.
Applications
CNC Milling
Suitable for compatible cylindrical-shank milling cutters used in slotting, profiling, and other milling operations.
Drilling and Reaming
Supports hole-making operations where tool alignment and clamping consistency contribute to dimensional control.
Precision Component Machining
Applicable to mold components, mechanical parts, and general metalworking operations requiring controlled tool positioning.
Batch Production
Consistent model identification and documented dimensions support tool management and repeat production requirements.
How to Select the Right ER Collet
Match the Holder Series
Confirm the ER designation and holder interface before selecting a collet. Different ER series are not interchangeable solely because their dimensions appear similar.
Confirm the Bore Size
Match the nominal bore and permitted clamping range to the actual tool shank diameter. Check the specified bore tolerance when close fit control is required.
Define Runout Accuracy
Specify the target TIR, test mandrel diameter, and measurement position. The assembled holder system also affects the measured result.
Review Operating Conditions
Consider spindle speed, tool overhang, cutting load, and coolant requirements when selecting the complete tool-holding setup.
Custom Manufacturing Options
Drawing-Based Customization
Submit technical drawings or samples for review of non-standard dimensions, tolerances, and manufacturing feasibility.
Special Bore Sizes
Specify the nominal diameter, tolerance, and metric or inch system for the required configuration.
Precision Requirements
Provide the target TIR and inspection conditions so that measurement procedures and acceptance criteria can be agreed before production.
Packaging and Identification
Individual labels, part references, and packaging requirements can be specified for repeat orders and distribution programs.
Quality Control and Inspection
Dimensional Inspection
Check bore diameter, outside diameter, overall length, and drawing-defined features against the applicable tolerances.
Runout Measurement
Measure TIR with a suitable test mandrel and defined measurement position. Record the test conditions with the inspection result.
Material Verification
Confirm material grade and hardness against the approved specification and applicable inspection records.
Batch Documentation
Agree on part identification, inspection records, and traceability requirements before order confirmation.
Ordering and Supply Details
Model and Quantity
List each ER series, bore size, required quantity, and measurement system to establish the order specification.
Repeat Orders
Reference the approved part number and drawing revision to maintain consistent specifications across replenishment orders.
Delivery Planning
Confirm production lead time, packaging, shipment quantity, and delivery arrangements during quotation review.
Frequently Asked Questions
Q: How do I select the correct ER collet?
A: Confirm the holder series, then match the nominal bore and permitted clamping range to the tool shank diameter.
Q: How is ER collet runout specified?
A: State the required TIR, test mandrel diameter, measurement position, and inspection conditions. Confirm the applicable precision grade before ordering.
Q: Are metric and inch bore sizes available?
A: Availability depends on the ER series and bore diameter. Specify the required measurement system when requesting a quotation.
Q: Can ER collets be customized?
A: Customized dimensions and inspection requirements can be reviewed against technical drawings, samples, and application details.
Q: What information is required for a quotation?
A: Provide the ER series, bore sizes, quantities, runout requirements, applicable drawings, and packaging preferences.
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