BT30, BT40, BT50 and BT60 pull studs to MAS 403-1975, in 45, 60 and 90 degree knob angles, threaded M12, M16, M24 and M30. Thread follows the taper, and it is the first thing to check: a retention knob has to match the drawbar on head angle and thread, not just on taper number. Fig.1 models are solid; the /T models are bored straight down the middle for coolant through the spindle, 3mm at BT30 out to 14mm at BT60. Pull studs are wear parts on a CNC machining center; ordering a replacement means matching the one you pulled out. Dimensions per model are in the chart below.
| Cart+ | SKU | Price | Quantity | Total | D (mm) | d1 (mm) | d2 (mm) | d3 (mm) | L (mm) | L1 (mm) | L2 (mm) | T | D4 (mm) | FIG |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
BT30-45° | $3 | $0 | 16.5 | 11 | 7 | 12.5 | 43 | 23 | 18 | M12 | - | Fig.1 | ||
BT40-45° | $3 | $0 | 23 | 15 | 10 | 17 | 60 | 35 | 28 | M16 | - | Fig.1 | ||
BT50-45° | $7 | $0 | 38 | 23 | 17 | 25 | 85 | 45 | 35 | M24 | - | Fig.1 | ||
BT60-45° | $34 | $0 | 56 | 32 | 24 | 31 | 115 | 65 | 53 | M30 | - | Fig.1 | ||
BT30-60° | $3 | $0 | 16.5 | 11 | 7 | 12.5 | 43 | 23 | 18 | M12 | - | Fig.1 | ||
BT40-60° | $3 | $0 | 23 | 15 | 10 | 17 | 60 | 35 | 28 | M16 | - | Fig.1 | ||
BT50-60° | $8 | $0 | 38 | 23 | 17 | 25 | 85 | 45 | 35 | M24 | - | Fig.1 | ||
BT60-60° | $34 | $0 | 56 | 32 | 24 | 31 | 115 | 65 | 53 | M30 | - | Fig.1 | ||
BT30-90° | $3 | $0 | 16.5 | 11 | 7 | 12.5 | 43 | 23 | 18 | M12 | - | Fig.1 | ||
BT40-90° | $3 | $0 | 23 | 15 | 10 | 17 | 60 | 35 | 28 | M16 | - | Fig.1 | ||
BT50-90° | $8 | $0 | 38 | 23 | 17 | 25 | 85 | 45 | 35 | M24 | - | Fig.1 | ||
BT60-90° | $34 | $0 | 56 | 32 | 24 | 31 | 115 | 65 | 53 | M30 | - | Fig.1 | ||
BT30-45°T | $3 | $0 | 16.5 | 11 | 7 | 12.5 | 43 | 23 | 18 | M12 | 3 | Fig.2 | ||
BT40-45°T | $4 | $0 | 23 | 15 | 10 | 17 | 60 | 35 | 28 | M16 | 4 | Fig.2 | ||
BT50-45°T | $9 | $0 | 38 | 23 | 17 | 25 | 85 | 45 | 35 | M24 | 6 | Fig.2 | ||
BT60-45°T | $41 | $0 | 56 | 32 | 24 | 31 | 115 | 65 | 53 | M30 | 14 | Fig.2 | ||
BT30-60°T | $3 | $0 | 16.5 | 11 | 7 | 12.5 | 43 | 23 | 18 | M12 | 3 | Fig.2 | ||
BT40-60°T | $4 | $0 | 23 | 15 | 10 | 17 | 60 | 35 | 28 | M16 | 4 | Fig.2 | ||
BT50-60°T | $9 | $0 | 38 | 23 | 17 | 25 | 85 | 45 | 35 | M24 | 6 | Fig.2 | ||
BT60-60°T | $41 | $0 | 56 | 32 | 24 | 31 | 115 | 65 | 53 | M30 | 14 | Fig.2 | ||
BT30-90°T | $3 | $0 | 16.5 | 11 | 7 | 12.5 | 43 | 23 | 18 | M12 | 3 | Fig.2 | ||
BT40-90°T | $4 | $0 | 23 | 15 | 10 | 17 | 60 | 35 | 28 | M16 | 4 | Fig.2 | ||
BT50-90°T | $9 | $0 | 38 | 23 | 17 | 25 | 85 | 45 | 35 | M24 | 6 | Fig.2 | ||
BT60-90°T | $41 | $0 | 56 | 32 | 24 | 31 | 115 | 65 | 53 | M30 | 14 | Fig.2 |
Made to MAS 403-1975 for BT taper tool holders
BT30, BT40, BT50 and BT60 — 24 part numbers
Thread follows the taper: M12 at BT30 up to M30 at BT60
45, 60 and 90 degree knob angles in every size
Solid (Fig.1) or coolant through (Fig.2, /T suffix)
Through-hole 3mm at BT30 up to 14mm at BT60
20CrMnTi alloy steel; head 55-58 HRC, thread and body 35±5 HRC
Machined to 0.005mm
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