Sealed ER collets combine precision tool clamping with coolant sealing for compatible ER tool holder assemblies. They help control coolant flow around the tool shank and support delivery through the intended cutting-tool passage.
Available configurations depend on the ER series, nominal bore, sealing design, and operating conditions. Selection should be based on tool-shank dimensions, holder compatibility, and the required coolant pressure.
Key Product Advantages
Controlled Coolant Delivery
The sealing structure helps direct coolant through the intended flow path when the collet, tool, and holder are correctly matched.
Precise Bore Matching
Fixed-bore configurations provide a specified clamping diameter. Matching the bore to the tool-shank tolerance supports proper seating and sealing.
Repeatable Tool Positioning
Controlled bore geometry and ground functional surfaces support consistent assembly. Complete-system runout depends on the collet, holder, nut, tool shank, and setup conditions.
Flexible Specifications
Standard configurations and customized dimensions can be reviewed against application drawings, tooling requirements, and specified inspection criteria.
Technical Specifications
|
Parameter |
Numerical Reference |
|
ER series |
ER11, ER16, ER20, ER25, ER32, ER40 |
|
Example nominal bore sizes |
3, 4, 6, 8, 10, 12, 16, 20, 25 mm |
|
Example ER16C body dimensions |
27.5 × 17.1 mm |
|
Example ER20C body dimensions |
31.5 × 21.1 mm |
|
Example ER25C body dimensions |
34.0 × 26.1 mm |
|
Example ER32C body dimensions |
40.0 × 33.1 mm |
|
Example ER40C body dimensions |
46.0 × 41.1 mm |
|
Bore tolerance |
0 / -0.01 mm |
|
Material and hardness |
Alloy spring steel |
|
Runout accuracy |
HRC 50–54 |
|
Coolant pressure rating |
≤ 0.01 mm |
|
Custom bore sizes |
3–25 mm, subject to ER series compatibility |
Product Selection Guide
Match the ER Series
Confirm the holder interface, collet series, and nut arrangement. Check the relevant dimensions rather than relying on the series designation alone.
Specify the Bore
Measure the tool shank and select the corresponding nominal bore. Fixed-bore sealed collets do not automatically share the collapse range of conventional ER collets.
Confirm Pressure Requirements
Provide the normal operating pressure and required coolant flow path. Select a configuration with a documented pressure rating suitable for the application.
Check Tool Engagement
Verify the tool-shank tolerance, insertion depth, and sealing engagement against the approved drawing and assembly instructions.
Typical Applications
Through-Coolant Drilling
For compatible drills with internal coolant passages and a matching sealing configuration.
CNC Milling
For milling tools with suitable shank dimensions and coolant passages, subject to the specified operating conditions.
Reaming and Finishing
For compatible rotary tools requiring controlled coolant delivery and consistent tool positioning.
Repetitive Production
For recurring machining operations where tool dimensions, assembly procedures, and coolant conditions are defined and repeatable.
Custom Manufacturing Options
Bore Customization
Non-standard bore sizes can be assessed using dimensional drawings, measured tool-shank diameters, or sample references.
Dimensional Modifications
Required body dimensions and functional interfaces can be reviewed against the existing holder assembly and manufacturing feasibility.
Sealing Configuration
The sealing arrangement can be evaluated against the coolant route, tool geometry, and required operating pressure.
OEM and ODM Projects
Drawing review, agreed tolerances, inspection requirements, packaging, and production quantities can be specified before quotation.
Manufacturing and Quality Control
Dimensional Inspection
Bore diameter, functional interfaces, and critical dimensions should be checked against the approved drawing.
Grinding Control
Grinding operations should follow defined dimensional and surface-finish requirements for the specified configuration.
Material Verification
Material grade and heat-treatment requirements should be documented and checked against the approved specification.
Performance Testing
Runout and coolant sealing should be evaluated using defined methods and operating conditions. Inspection reports can be supplied when included in the agreed quality requirements.
Compatibility and Operating Requirements
Holder Interface
Verify the ER series, holder dimensions, nut arrangement, and assembly requirements before installation.
Tool-Shank Fit
Use the specified nominal diameter and shank tolerance. Correct seating and the required engagement length support the intended sealing function.
Coolant Pressure
Keep operating pressure within the validated rating for the selected configuration. Ratings must be confirmed for each applicable model.
Coolant Compatibility
Confirm that the coolant is compatible with the sealing materials and follow the specified assembly and maintenance procedures.
Information for Quotation
Product Configuration
Provide the ER series, nominal bore diameter, quantity, and required sealing arrangement.
Dimensional References
Include a drawing, tool-shank measurements, or sample reference for non-standard specifications.
Operating Conditions
State the coolant pressure, coolant type, tool type, and intended flow path.
Quality and Delivery
Specify inspection documentation, packaging requirements, order quantity, and requested delivery schedule.
Frequently Asked Questions
Q: Do sealed ER collets have a clamping range?
A: Many sealed designs use a fixed nominal bore. Confirm the permitted diameter and tolerance for the selected configuration.
Q: Are sealed ER collets compatible with existing holders?
A: Compatibility depends on the ER series, holder interface, nut arrangement, and sealing design. Verify the dimensions before installation.
Q: What coolant pressure can they withstand?
A: The rated pressure varies by design. Confirm the documented rating for the exact configuration before operation.
Q: Can custom bore sizes be produced?
A: Custom sizes can be reviewed against drawings, measured dimensions, and application requirements.
Q: What information is needed for selection?
A: Provide the ER series, tool-shank diameter and tolerance, coolant pressure, tool type, and holder reference.
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