Pull studs for MAZAK spindles: BT40 and BT50 on M16 and M24 metric thread, CAT40U and CAT50U on 5/8"-11UNC and 1"-8UNC. MAZAK is the machine builder, not the maker of this part — these are replacement retention knobs made to the geometry those spindles expect, and every dimension on the CAT models is listed in both metric and inch, so you can measure the knob you are pulling out against the table. Four of the eight are /T, with a coolant through hole down the center: 7mm on the 40 taper, 10mm on the 50. BT40 takes a 19mm wrench flat, BT50 a 30mm. Dimensions per model are in the size chart below.
| Cart+ | SKU | Price | Quantity | Total | d1 (mm) | d2 (mm) | d3 (mm) | d4 (mm) | T | d6 (mm) | L1 (mm) | L2 (mm) | L3 (mm) | L4 (mm) | L5 (mm) | SW (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
MAZAK-BT40 | $7 | $0 | 18.8 | 12.45 | 22 | 17 | M16 | - | 44.1 | 19.1 | 14.02 | 2 | 3 | 19 | ||
MAZAK-BT40/T | $8 | $0 | 18.8 | 12.45 | 22 | 17 | M16 | 7 | 44.1 | 19.1 | 14.02 | 2 | 3 | 19 | ||
MAZAK-BT50 | $9 | $0 | 29 | 20.83 | 37 | 25 | M24 | - | 65.2 | 25.2 | 17.7 | 2.5 | 5 | 30 | ||
MAZAK-BT50/T | $10 | $0 | 29 | 20.83 | 37 | 25 | M24 | 10 | 65.2 | 25.2 | 17.7 | 2.5 | 5 | 30 | ||
MAZAK-CAT40U | $9 | $0 | 18.8 (0.740″) | 12.45 (0.490″) | 22 (0.866″) | 16.28 (0.641″) | 5/8″-11UNC | - | 41.26 (1.624″) | 16.26 (0.640″) | 11.18 (0.440″) | 1.52 (0.060″) | 3 (0.118″) | 19.05 (0.750″) | ||
MAZAK-CAT40U/T | $10 | $0 | 18.8 (0.740″) | 12.45 (0.490″) | 22 (0.866″) | 16.28 (0.641″) | 5/8″-11UNC | 7 (0.276″) | 41.26 (1.624″) | 16.26 (0.640″) | 11.18 (0.440″) | 1.52 (0.060″) | 3 (0.118″) | 19.05 (0.750″) | ||
MAZAK-CAT50U | $11 | $0 | 28.96 (1.140″) | 20.83 (0.820″) | 35.56 (1.400″) | 26.18 (1.030″) | 1″-8UNC | - | 58.5 (2.303″) | 25.4 (1.000″) | 17.78 (0.700″) | 2.54 (0.100″) | 5 (0.197″) | 30.15 (1.187″) | ||
MAZAK-CAT50U/T | $12 | $0 | 28.96 (1.140″) | 20.83 (0.820″) | 35.56 (1.400″) | 26.18 (1.030″) | 1″-8UNC | 10 (0.394″) | 58.5 (2.303″) | 25.4 (1.000″) | 17.78 (0.700″) | 2.54 (0.100″) | 5 (0.197″) | 30.15 (1.187″) |
Made to fit MAZAK BT40, BT50, CAT40 and CAT50 U-type spindles
MAZAK is the machine builder; this is a replacement part
Metric thread on the BT models, UNC on the CAT U models
/T models add a coolant through hole, 7mm and 10mm
BT40 takes a 19mm wrench flat, BT50 a 30mm
20CrMnTi alloy steel; head 55-58 HRC, thread and body 35±5 HRC
Machined to 0.005mm
CAT models dimensioned in both metric and inch
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