Coolant-Through ER Collets combine tool clamping with a dedicated coolant passage for CNC machining. Depending on the configuration, coolant is directed through a compatible cutting tool or routed toward the cutting zone. ER series, bore diameter, passage geometry, and sealing requirements determine compatibility with the complete tool holding assembly. Standard configurations and custom dimensions can be reviewed against technical drawings and application requirements.
Key Advantages
Direct Coolant Routing
A defined passage directs cutting fluid toward the tool or cutting zone. The required flow path depends on the collet design and connected tooling components.
Precise Bore Matching
Matching the collet bore to the tool shank supports consistent contact and tool positioning. The specified bore tolerance and runout requirements should be confirmed for each application.
Configuration Flexibility
Different ER sizes, bore diameters, and coolant arrangements support varied tooling requirements. Selection can be based on the existing holder and cutting tool.
Specification Control
Approved drawings establish dimensional references for inspection, repeat production, and order verification.
Product Specifications
|
Parameter |
ER16 |
ER20 |
ER25 |
ER32 |
ER40 |
|
Nominal ER size |
16 |
20 |
25 |
32 |
40 |
|
Reference body diameter (mm) |
17.0 |
21.0 |
26.0 |
33.0 |
41.0 |
|
Reference overall length (mm) |
27.5 |
31.5 |
34.0 |
40.0 |
46.0 |
|
Reference maximum bore (mm) |
10 |
13 |
16 |
20 |
26 |
Coolant Passage Options
Through-Tool Delivery
The passage connects the coolant supply to a compatible tool inlet. The holder, collet, and tool must form a continuous fluid path.
External Coolant Routing
A suitable outlet can direct coolant around the tool shank toward the cutting area. Outlet position and tool geometry determine the delivery arrangement.
Sealed Coolant Delivery
A sealed configuration uses a defined sealing interface to control coolant flow. Bore size, tool shank tolerance, engagement length, and pressure rating must match the specified design.
Applications
Drilling
Through-tool coolant supports fluid delivery near the cutting edges and assists chip evacuation in compatible drilling operations.
Reaming
A matched collet supports tool positioning during hole finishing when the tool and holder provide the required coolant route.
Milling
Compatible coolant-through tools can receive coolant through the holding assembly, subject to the tool inlet design and operating conditions.
ER Size Selection
Match the Tool Diameter
Select the bore according to the tool shank diameter and required tolerance. Sealed designs may require an exact-size bore rather than a conventional clamping range.
Verify Holder Compatibility
Check the ER series, seating geometry, nut interface, and holder dimensions. The ER designation alone does not establish compatibility.
Confirm Coolant Requirements
Specify the coolant route, operating pressure, tool inlet, and sealing arrangement before selecting the final configuration.
Customization Services
Custom Bore Sizes
Special metric or inch bores can be evaluated against drawings, samples, and specified tolerances.
Passage Design
Internal channels, outlet positions, and sealing features can be reviewed for the intended tool interface and coolant route.
Drawing-Based Production
Approved drawings define critical dimensions, materials, tolerances, and inspection requirements. Production feasibility, quantities, and delivery schedules are confirmed during technical review.
Manufacturing and Quality Control
Dimensional Inspection
The bore, body diameter, overall length, and drawing-defined features are checked against agreed dimensional requirements.
Runout Verification
Runout limits should specify the test method, reference shank, measurement position, and allowable deviation.
Passage and Seal Inspection
Coolant passages and sealing features are checked against the approved design. Flow or pressure testing can be specified with documented acceptance criteria.
Compatibility and Ordering
Technical Requirements
Provide the ER size, tool shank diameter, holder interface, coolant route, operating pressure, and machining application.
Drawing Confirmation
A drawing or sample reference helps establish bore dimensions, passage geometry, sealing requirements, and inspection criteria before production.
Repeat Order Control
An approved specification record provides a consistent reference for repeat orders and confirmed design revisions.
Frequently Asked Questions
Q: What is a coolant-through ER collet?
A: It is an ER clamping component with a coolant passage for a compatible tool holding arrangement.
Q: Can it fit an existing ER holder?
A: Compatibility depends on the ER series, seating geometry, nut interface, and coolant path.
Q: Does every model provide a sealed connection?
A: No. Sealing depends on the design and must match the tool shank and coolant requirements.
Q: What coolant pressure is supported?
A: The rated pressure must be confirmed for the exact configuration using the applicable technical specification or test record.
Q: Are custom dimensions available?
A: Custom bore sizes and coolant passage designs can be reviewed against drawings or samples.
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