Collets

Collets for CNC machine shops. Browse our full collets range. India-wide shipping. Bulk pricing available — message us on WhatsApp for quotes.

ER collets, collet chucks, and collet accessories for CNC milling machines and conventional mills. ER-11 through ER-40 sizes — precision-ground for low runout.

Frequently asked questions

How do I pick the right ER collet size for my tool?

Each ER collet is rated for a 1 mm sub-range. A 10 mm ER-20 collet clamps shanks from 9 to 10 mm. Use the collet matching your tool shank exactly — do not try to clamp a 10 mm shank in an 11 mm collet.

What is the difference between ER-16, ER-20, ER-25, ER-32, and ER-40?

The numbers are nominal outer diameters of the collet series. Larger numbers clamp larger tool shanks. ER-16 clamps 1-10 mm. ER-20 clamps 1-13 mm. ER-25 clamps 1-16 mm. ER-32 clamps 3-20 mm. ER-40 clamps 3-26 mm. Larger series = larger machine capacity but heavier, higher inertia.

What is the runout of an ER collet?

Standard industrial ER collets have a runout (TIR — total indicator reading) of less than 0.01 mm at the nose. Precision-grade collets reach 0.005 mm TIR. For high-speed milling, lower runout reduces tool wear and improves surface finish.

Can I reuse a collet if it has been dropped?

If visibly damaged (flats, dings, cracked slots) — no, replace it. Even a small ding on the sealing surface causes runout and can damage the tool shank. ER collets are cheap enough that replacement is preferred over risking tool or part damage.

19 products