ER tapping collets hold threading taps in compatible ER collet chucks for internal thread machining. The precision bore locates the tap shank, while the internal square engages the tap's square drive to transmit torque. Correct selection requires matching the ER series, shank diameter, square size, and holder interface. Standard configurations and custom dimensions can be reviewed against technical drawings and application requirements.
Key Features
Square Drive Engagement
The internal square engages the tap's square section to transmit torque during threading. Correct dimensional matching supports secure engagement under cutting load.
Precision Bore Matching
The bore is sized for the specified tap shank diameter. An exact-size fit supports consistent tool positioning and repeatable setup.
ER Interface
The external profile matches the specified ER series. Confirm the holder interface before selecting a collet configuration.
Custom Dimensions
Special bore diameters and square dimensions can be assessed using technical drawings or verified samples.
Technical Specifications
|
Parameter |
ER20 Reference Configuration |
|
Product type |
ER tapping collet |
|
ER series |
ER20 |
|
Tap size reference |
M4.5–M8 |
|
Bore diameter |
6.0 mm |
|
Square drive size |
4.9 mm |
|
Clamping length |
18.0 mm |
|
Total indicated runout (TIR) |
0.015 mm |
|
Collet classification |
Class 2 |
|
Bore clamping range |
Exact-size bore |
|
Measurement system |
Metric |
Tapping Applications
Steel Components
Select a suitable tap and collet combination for internal threading in carbon steel and alloy steel parts, based on material condition and cutting requirements.
Aluminum Components
Matched shank and square dimensions support tap positioning in aluminum part production, including machinery components and precision-machined parts.
Stainless Steel Parts
Consider work-hardening behavior, tap geometry, lubrication, thread depth, and cutting conditions when selecting the tooling configuration.
Repetitive Production
A defined collet specification provides a consistent reference for tool setup, replacement, and dimensional verification across recurring operations.
Selection and Compatibility
Confirm the ER Series
Match the collet's external interface to the ER series specified for the existing holder.
Match the Tap Shank
Check the tap's nominal shank diameter against the collet bore. Exact-size tapping collets do not use the same clamping range as conventional collapsible ER collets.
Verify the Square Drive
Measure the square width and confirm the engagement dimensions. Bore diameter alone does not establish full compatibility.
Identify the Tapping Method
Confirm whether the application uses synchronous rigid tapping or requires axial compensation. Select the collet according to the complete holder and machine configuration.
Manufacturing and Quality Control
Dimensional Inspection
Bore diameter, square size, external dimensions, and overall length should be checked against the approved drawing.
Runout Verification
Specify the required TIR, measurement position, and inspection method. Accuracy values should correspond to documented inspection results.
Material and Hardness
Confirm material grade, heat-treatment condition, and hardness requirements against the agreed technical specification.
Batch Documentation
Product identification and inspection records can be defined according to the order's documentation requirements.
Customization Options
Special Bore Sizes
Custom bore diameters can be reviewed against tap shank measurements and specified tolerances.
Square Drive Dimensions
Special square widths and engagement lengths can be assessed from technical drawings or verified samples.
Drawing-Based Production
Two-dimensional drawings, three-dimensional files, and physical samples provide dimensional references for manufacturing review.
Marking and Packaging
Identification marks, private-label requirements, and packaging specifications can be agreed during order review.
Why Choose This Product Range
Defined Selection Criteria
ER series, bore diameter, and square dimensions provide clear reference points for selecting the correct configuration.
Technical Review
Drawing review establishes dimensional requirements before production begins.
Inspection Requirements
Agreed measurement criteria provide a basis for checking critical dimensions against approved specifications.
Repeat-Order Control
Retained drawings and specification records support consistent ordering of previously approved configurations.
Frequently Asked Questions
Q: How do I select the correct ER tapping collet?
A: Confirm the ER series, tap shank diameter, square size, and holder compatibility before ordering.
Q: Can a standard ER collet replace a tapping collet?
A: A standard ER collet relies on frictional clamping. A tapping collet with an internal square provides dedicated engagement with the tap's square drive.
Q: Can ER tapping collets be used for rigid tapping?
A: Square-drive configurations can be suitable for synchronous tapping when the holder, machine synchronization, and operating conditions are compatible.
Q: Are custom dimensions available?
A: Special dimensions can be reviewed against drawings or samples, subject to manufacturing feasibility and agreed tolerances.
Q: What information is needed for a quotation?
A: Provide the ER series, tap shank diameter, square size, required tolerances, quantity, and drawing or sample reference where available.
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