ER Collet Size Chart: ER8 to ER50
Compare ER8, ER11, ER16, ER20, ER25, ER32, ER40 and ER50 collet sizes, clamping ranges and common CNC applications.
Technical Resources
Technical Resources
These resources help buyers compare ER sizes, understand compatibility questions and prepare better quotation requests.
Specification guidance
Use these pages as a starting point for product selection, then confirm holder compatibility and production tolerances with Yuanchen.
Confirmed product data
Exact material, hardness, accuracy and other order-specific values are available from Yuanchen after the product variant and application are reviewed.
Technical Articles
DIN 6499 vs ISO 15488 for ER Collets
Understand how DIN 6499 and ISO 15488 relate to ER collets, buyer specifications and compatibility checks.
How to Select an ER Collet
Select the correct ER collet by holder size, tool shank diameter, application, runout requirement and coolant needs.
ER32 vs ER40 Collets
Compare ER32 and ER40 collets for clamping range, holder size, application fit and buyer selection.
What Causes Collet Runout?
Common causes of collet runout, including holder wear, dirty tapers, incorrect assembly, tool shank condition and inspection method.
How to Install an ER Collet
Install an ER collet correctly by clipping it into the nut, inserting the tool, tightening properly and checking holder cleanliness.
Standard vs High-Precision ER Collets
Compare standard and high-precision ER collets for machining applications, inspection requirements and quotation details.
Sealed Coolant Collets
Guide to sealed coolant collets for through-tool coolant applications, including compatibility and pressure confirmation.
How to Measure Collet Runout
Measure collet runout with a controlled test setup, clean holder, suitable test bar and agreed gauge distance.
ER Collet Torque Guide
ER collet torque guidance for buyers, including why torque depends on holder, nut, collet size and supplier data.
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