BT tool holders
BT ER Collet Chucks – BT30, BT40 and BT50 (MAS 403)
An ER collet chuck holds round-shank cutting tools in a DIN 6499 ER collet, closed by an ER clamping nut, for drilling, reaming and milling. PTP makes them with a BT shank (MAS 403 / JIS B6339, ISO 7388-2 type J) in BT30, BT40 and BT50: ER16 to ER50 collets, gauge lengths 60–300 mm, 58 ordering codes in all. They are pulled into the spindle by MAS-BT or JIS B6339 pull studs: M12 on BT30, M16 on BT40 and M24 on BT50. Taper AT3 or better, TIR 0.005 mm max, balanced G2.5 @ 25,000 rpm.
ER Collet Chucks, BT shank
PTP catalogue drawing, dimensions in mm
All 58 BT ER collet chucks
One table per taper size. Every ordering code opens its own page with its dimensions (mm).
BT30 ER collet chucks: 10 ordering codes
| Ordering code | Collet | Clamping Range | Nut Ø (d) | Gauge Length (GPL) | GPL Long |
|---|---|---|---|---|---|
| 47BT30ER1660 | ER16 | 1–10 mm | 28 mm | 60 mm | – |
| 47BT30ER16100 | ER16 | 1–10 mm | 28 mm | 100 mm | – |
| 47BT30ER2060 | ER20 | 1–13 mm | 32 mm | 60 mm | – |
| 47BT30ER20100 | ER20 | 1–13 mm | 32 mm | 100 mm | 120 mm |
| 47BT30ER2560 | ER25 | 1–16 mm | 42 mm | 60 mm | – |
| 47BT30ER25100 | ER25 | 1–16 mm | 42 mm | 100 mm | – |
| 47BT30ER3260 | ER32 | 2–20 mm | 50 mm | 60 mm | – |
| 47BT30ER32100 | ER32 | 2–20 mm | 50 mm | 100 mm | – |
| 47BT30ER20150 | ER20 | 1–13 mm | 34 mm | 150 mm | – |
| 47BT30ER25150 | ER25 | 1–16 mm | 42 mm | 150 mm | – |
BT40 ER collet chucks: 22 ordering codes
| Ordering code | Collet | Clamping Range | Nut Ø (d) | Gauge Length (GPL) | GPL Long |
|---|---|---|---|---|---|
| 47BT40ER1670 | ER16 | 1–10 mm | 28 mm | 70 mm | – |
| 47BT40ER16100 | ER16 | 1–10 mm | 28 mm | 100 mm | – |
| 47BT40ER2070 | ER20 | 1–13 mm | 34 mm | 70 mm | – |
| 47BT40ER20100 | ER20 | 1–13 mm | 34 mm | 100 mm | – |
| 47BT40ER2570 | ER25 | 1–16 mm | 42 mm | 70 mm | 150 mm |
| 47BT40ER25100 | ER25 | 1–16 mm | 42 mm | 100 mm | – |
| 47BT40ER3270 | ER32 | 2–20 mm | 50 mm | 70 mm | 200 mm |
| 47BT40ER32100 | ER32 | 2–20 mm | 50 mm | 100 mm | – |
| 47BT40ER4080 | ER40 | 3–26 mm | 63 mm | 80 mm | – |
| 47BT40ER40100 | ER40 | 3–26 mm | 63 mm | 100 mm | – |
| 47BT40ER50100 | ER50 | 10–34 mm | 78 mm | 100 mm | – |
| 47BT40ER50160 | ER50 | 10–34 mm | 78 mm | 160 mm | 250 mm |
| 47BT40ER16200 | ER16 | 1–10 mm | 28 mm | 200 mm | – |
| 47BT40ER20150 | ER20 | 1–13 mm | 34 mm | 150 mm | – |
| 47BT40ER20200 | ER20 | 1–13 mm | 34 mm | 200 mm | – |
| 47BT40ER25150 | ER25 | 1–16 mm | 42 mm | 150 mm | – |
| 47BT40ER25200 | ER25 | 1–16 mm | 42 mm | 200 mm | – |
| 47BT40ER16150 | ER16 | 1–10 mm | 28 mm | 150 mm | – |
| 47BT40ER32150 | ER32 | 2–20 mm | 50 mm | 150 mm | – |
| 47BT40ER32250 | ER32 | 2–20 mm | 50 mm | 250 mm | – |
| 47BT40ER40150 | ER40 | 3–26 mm | 63 mm | 150 mm | – |
| 47BT40ER40200 | ER40 | 3–26 mm | 63 mm | 200 mm | – |
BT50 ER collet chucks: 26 ordering codes
| Ordering code | Collet | Clamping Range | Nut Ø (d) | Gauge Length (GPL) | GPL Long |
|---|---|---|---|---|---|
| 47BT50ER1680 | ER16 | 1–10 mm | 28 mm | 80 mm | – |
| 47BT50ER16100 | ER16 | 1–10 mm | 28 mm | 100 mm | – |
| 47BT50ER2080 | ER20 | 1–13 mm | 34 mm | 80 mm | – |
| 47BT50ER20100 | ER20 | 1–13 mm | 34 mm | 100 mm | – |
| 47BT50ER2580 | ER25 | 1–16 mm | 42 mm | 80 mm | 160 mm |
| 47BT50ER25100 | ER25 | 1–16 mm | 42 mm | 100 mm | – |
| 47BT50ER3280 | ER32 | 2–20 mm | 50 mm | 80 mm | 200 mm |
| 47BT50ER32100 | ER32 | 2–20 mm | 50 mm | 100 mm | – |
| 47BT50ER4080 | ER40 | 3–26 mm | 63 mm | 80 mm | – |
| 47BT50ER40100 | ER40 | 3–26 mm | 63 mm | 100 mm | – |
| 47BT50ER50100 | ER50 | 10–34 mm | 78 mm | 100 mm | – |
| 47BT50ER50160 | ER50 | 10–34 mm | 78 mm | 160 mm | – |
| 47BT50ER16200 | ER16 | 1–10 mm | 28 mm | 200 mm | – |
| 47BT50ER20150 | ER20 | 1–13 mm | 34 mm | 150 mm | – |
| 47BT50ER20200 | ER20 | 1–13 mm | 34 mm | 200 mm | – |
| 47BT50ER25150 | ER25 | 1–16 mm | 42 mm | 150 mm | – |
| 47BT50ER25200 | ER25 | 1–16 mm | 42 mm | 200 mm | – |
| 47BT50ER32150 | ER32 | 2–20 mm | 48 mm | 150 mm | – |
| 47BT50ER32200 | ER32 | 2–20 mm | 48 mm | 200 mm | – |
| 47BT50ER16150 | ER16 | 1–10 mm | 28 mm | 150 mm | – |
| 47BT50ER16250 | ER16 | 1–10 mm | 28 mm | 250 mm | – |
| 47BT50ER25250 | ER25 | 1–16 mm | 42 mm | 250 mm | – |
| 47BT50ER25260 | ER25 | 1–16 mm | 42 mm | 260 mm | – |
| 47BT50ER25300 | ER25 | 1–16 mm | 42 mm | 300 mm | – |
| 47BT50ER32250 | ER32 | 2–20 mm | 48 mm | 250 mm | – |
| 47BT50ER32300 | ER32 | 2–20 mm | 48 mm | 300 mm | – |
Questions about BT ER collet chucks
Which pull stud does a BT ER collet chuck take?
The pull stud of its taper size: M12 on BT30, M16 on BT40 and M24 on BT50. Use a MAS-BT pull stud with the head angle your drawbar takes (45°, 60° or 90°), or a JIS B6339 stud with a 15° head (BT40 and BT50).
What goes with a BT ER collet chuck?
DIN 6499 ER collets (ER16, ER20, ER25, ER32, ER40 and ER50), the ER clamping nut of that size (slotted 36CCNER16, 36CCNER20, 36CCNER25, 36CCNER32, 36CCNER40 and 36CCNER50; hex ER-A 36CCNER16A and 36CCNER20A) and, for coolant-through tools, an ER sealing ring (ER16, ER20, ER25, ER32 and ER40).
ER collets DIN 6499 Slotted ER collet nuts Hex ER collet nuts ER sealing rings ER collet size chart