ER20 Collets

ER20 collets in 27 metric sizes from 0.5 to 14 mm and 15 inch sizes from 1/16" to 1/2", plus 9 DNA 20 collets and two ER20 collet sets (12-piece inch, 12-piece metric). An ER20 collet is 31.5 mm (1.24") long with a 21 mm (.83") outside diameter.

Metric collets are named by the shank range they hold, for example ER20 5-6mm, and inch collets by the shank size. Our ER collets are made from high-carbon bearing steel, ground and heat treated, and hand inspected, with runout (T.I.R.) averaging 0.0002". Use them with a PowerCOAT nut for the best holding power and cutting tool life.

DNA 20 collets are DNA (Dead Nuts Accurate) collets for small tools. They hold the shank with more rigidity and accuracy than a standard ER collet, with 0.0002" runout, and they fit your ER20 holders. Four are exact-size collets for 1/8", 3/16", 1/4" and 3/8" shanks.

ER20 collets fit the ER20 holders on BT Collet Chucks (BT30, BT40), ISO Collet Chucks (ISO20) and Straight Shank Collet Chucks & Extensions. ER20 slotted, mini and dust seal nuts are on Collet Nuts, and ER20 internal dust seals on Dust Seals & Covers. All ER sizes and collet sets: Collets.