SK (ISO) Mini ER Collet Chucks – SK30, SK40 and SK50 (DIN 69871)

A mini ER collet chuck is a slim-nose ER-M collet chuck for small tools and deep cavities. PTP makes them with an SK (ISO) shank (DIN 69871 / ISO 7388-1) in SK30, SK40 and SK50: ER11M to ER25M collets, gauge lengths 60–150 mm, 23 ordering codes in all. They are pulled into the spindle by DIN 69872 pull studs: M12 on SK30, M16 on SK40 and M24 on SK50. Taper AT3 or better, TIR 0.005 mm max, balanced G2.5 @ 25,000 rpm.

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Mini ER Collet Chucks, SK (ISO) shank: technical drawing with dimensions — Mini ER Collet Chucks with a SK (ISO) shank, from the PTP catalogue. Click to open it full size.

All 23 SK (ISO) mini ER collet chucks

One table per taper size. Every ordering code opens its own page with its dimensions (mm).

SK30 mini ER collet chucks: 8 ordering codes

Ordering code	Collet	Clamping Range	Nut Ø (d)	Gauge Length (GPL)
47ISO30ER11M60	ER11M	0.5–7 mm	16 mm	60 mm
47ISO30ER11M100	ER11M	0.5–7 mm	16 mm	100 mm
47ISO30ER16M60	ER16M	1–10 mm	22 mm	60 mm
47ISO30ER16M100	ER16M	1–10 mm	22 mm	100 mm
47ISO30ER20M60	ER20M	1–13 mm	28 mm	60 mm
47ISO30ER20M100	ER20M	1–13 mm	28 mm	100 mm
47ISO30ER25M60	ER25M	1–16 mm	35 mm	60 mm
47ISO30ER25M100	ER25M	1–16 mm	35 mm	100 mm

SK40 mini ER collet chucks: 9 ordering codes

Ordering code	Collet	Clamping Range	Nut Ø (d)	Gauge Length (GPL)
47ISO40ER11M70	ER11M	0.5–7 mm	16 mm	70 mm
47ISO40ER11M100	ER11M	0.5–7 mm	16 mm	100 mm
47ISO40ER16M70	ER16M	1–10 mm	22 mm	70 mm
47ISO40ER16M100	ER16M	1–10 mm	22 mm	100 mm
47ISO40ER20M70	ER20M	1–13 mm	28 mm	70 mm
47ISO40ER20M100	ER20M	1–13 mm	28 mm	100 mm
47ISO40ER25M70	ER25M	1–16 mm	35 mm	70 mm
47ISO40ER25M100	ER25M	1–16 mm	35 mm	100 mm
47ISO40ER25M150	ER25M	1–16 mm	35 mm	150 mm

SK50 mini ER collet chucks: 6 ordering codes

Ordering code	Collet	Clamping Range	Nut Ø (d)	Gauge Length (GPL)
47ISO50ER16M80	ER16M	1–10 mm	22 mm	80 mm
47ISO50ER16M100	ER16M	1–10 mm	22 mm	100 mm
47ISO50ER20M80	ER20M	1–13 mm	28 mm	80 mm
47ISO50ER20M100	ER20M	1–13 mm	28 mm	100 mm
47ISO50ER25M80	ER25M	1–16 mm	35 mm	80 mm
47ISO50ER25M100	ER25M	1–16 mm	35 mm	100 mm

Questions about SK (ISO) mini ER collet chucks

Which pull stud does an SK mini ER collet chuck take?

The pull stud of its taper size: M12 on SK30, M16 on SK40 and M24 on SK50. Use a DIN 69872 pull stud with a 15° head.

SK30 pull studs SK40 pull studs SK50 pull studs

What goes with an SK mini ER collet chuck?

DIN 6499 ER collets (ER11, ER16, ER20 and ER25) and the ER-M mini collet nut of that size (36CCNER11M, 36CCNER16M, 36CCNER20M and 36CCNER25M).

ER collets DIN 6499 Mini ER collet nuts