The BT Shrink Fit Chuck 4.5° is a type of chuck used in machining processes. It is designed to securely hold tooling such as drills, end mills, or reamers in place during high-speed operations. The 4.5° angle provides added stability and precision for improved machining accuracy.
| Size | d | D | D1 | L | L2 | L1 | N | G |
| BT30-SF03-80 | 3 | 15 | 20 | 80 | 58 | - | - | - |
| BT30-SF04-80 | 4 | 15 | 20 | 80 | 58 | - | - | - |
| BT30-SF05-80 | 5 | 15 | 20 | 80 | 58 | - | - | - |
| BT30-SF06-80 | 6 | 21 | 27 | 80 | 58 | 36 | 10 | M5 |
| BT30-SF08-80 | 8 | 21 | 27 | 80 | 58 | 36 | 10 | M6 |
| BT30-SF10-80 | 10 | 24 | 30.5 | 80 | 58 | 42 | 10 | M8x1 |
| BT30-SF12-80 | 12 | 24 | 30.5 | 80 | 58 | 47 | 10 | M10x1 |
| BT30-SF14-80 | 14 | 27 | 33.5 | 80 | 58 | 47 | 10 | M10x1 |
| BT30-SF16-80 | 16 | 27 | 33.5 | 80 | 58 | 50 | 10 | M12x1 |
| BT30-SF18-80 | 18 | 33 | 39.5 | 80 | 58 | 50 | 10 | M12x1 |
| BT30-SF20-80 | 20 | 33 | 39.5 | 80 | 58 | 52 | 10 | M16x1 |
| BT40-SF03-80 | 3 | 15 | 20 | 80 | 53 | - | - | - |
| BT40-SF04-80 | 4 | 15 | 20 | 80 | 53 | - | - | - |
| BT40-SF05-80 | 5 | 15 | 20 | 80 | 53 | - | - | - |
| BT40-SF06-90 | 6 | 21 | 27 | 90 | 63 | 36 | 10 | M5 |
| BT40-SF08-90 | 8 | 21 | 27 | 90 | 63 | 36 | 10 | M6 |
| BT40-SF10-90 | 10 | 24 | 31 | 90 | 63 | 42 | 10 | M8x1 |
| BT40-SF12-90 | 12 | 24 | 31 | 90 | 63 | 47 | 10 | M10x1 |
| BT40-SF14-90 | 14 | 27 | 34 | 90 | 63 | 47 | 10 | M10x1 |
| BT40-SF16-90 | 16 | 27 | 34 | 90 | 63 | 50 | 10 | M12x1 |
| BT40-SF18-90 | 18 | 33 | 40 | 90 | 63 | 50 | 10 | M12x1 |
| BT40-SF20-90 | 20 | 33 | 40 | 90 | 63 | 52 | 10 | M16x1 |
| BT40-SF25-100 | 25 | 44 | 53 | 100 | 73 | 58 | 10 | M16x1 |
| BT40-SF32-100 | 32 | 44 | 53 | 100 | 73 | 62 | 10 | M16x1 |
| BT40-SF03-120 | 3 | 15 | 20 | 120 | 93 | - | - | - |
| BT40-SF04-120 | 4 | 15 | 20 | 120 | 93 | - | - | - |
| BT40-SF05-120 | 5 | 15 | 20 | 120 | 93 | - | - | - |
| BT40-SF06-120 | 6 | 21 | 27 | 120 | 93 | 36 | 10 | M5 |
| BT40-SF08-120 | 8 | 21 | 27 | 120 | 93 | 36 | 10 | M6 |
| BT40-SF10-120 | 10 | 24 | 32 | 120 | 93 | 42 | 10 | M8x1 |
| BT40-SF12-120 | 12 | 24 | 32 | 120 | 93 | 47 | 10 | M10x1 |
| BT40-SF14-120 | 14 | 27 | 34 | 120 | 93 | 47 | 10 | M10x1 |
| BT40-SF16-120 | 16 | 27 | 34 | 120 | 93 | 50 | 10 | M12x1 |
| BT40-SF18-120 | 18 | 33 | 42 | 120 | 93 | 50 | 10 | M12x1 |
| BT40-SF20-120 | 20 | 33 | 42 | 120 | 93 | 52 | 10 | M16x1 |
| BT40-SF25-120 | 25 | 44 | 53 | 120 | 93 | 58 | 10 | M16x1 |
| BT40-SF32-120 | 32 | 44 | 53 | 120 | 93 | 62 | 10 | M16x1 |
| BT40-SF03-160 | 3 | 15 | 25 | 160 | 133 | - | - | - |
| BT40-SF04-160 | 4 | 15 | 25 | 160 | 133 | - | - | - |
| BT40-SF05-160 | 5 | 15 | 25 | 160 | 133 | - | - | - |
| BT40-SF06-160 | 6 | 21 | 32 | 160 | 133 | 36 | 10 | M5 |
| BT40-SF08-160 | 8 | 21 | 32 | 160 | 133 | 36 | 10 | M6 |
| BT40-SF10-160 | 10 | 24 | 34 | 160 | 133 | 42 | 10 | M8x1 |
| BT40-SF12-160 | 12 | 24 | 34 | 160 | 133 | 47 | 10 | M10x1 |
| BT40-SF14-160 | 14 | 27 | 42 | 160 | 133 | 47 | 10 | M10x1 |
| BT40-SF16-160 | 16 | 27 | 42 | 160 | 133 | 50 | 10 | M12x1 |
| BT40-SF18-160 | 18 | 33 | 51 | 160 | 133 | 50 | 10 | M12x1 |
| BT40-SF20-160 | 20 | 33 | 51 | 160 | 133 | 52 | 10 | M16x1 |
| BT40-SF25-160 | 25 | 44 | 53 | 160 | 133 | 58 | 10 | M16x1 |
| BT40-SF32-160 | 32 | 44 | 60 | 160 | 133 | 62 | 10 | M16x1 |
| BT40-SF06-200 | 6 | 21 | 32 | 200 | 173 | 36 | 10 | M5 |
| BT40-SF08-200 | 8 | 21 | 32 | 200 | 173 | 36 | 10 | M6 |
| BT40-SF10-200 | 10 | 24 | 34 | 200 | 173 | 42 | 10 | M8x1 |
| BT40-SF12-200 | 12 | 24 | 34 | 200 | 173 | 47 | 10 | M10x1 |
| BT40-SF14-200 | 14 | 27 | 42 | 200 | 173 | 47 | 10 | M10x1 |
| BT40-SF16-200 | 16 | 27 | 42 | 200 | 173 | 50 | 10 | M12x1 |
| BT40-SF18-200 | 18 | 33 | 51 | 200 | 173 | 50 | 10 | M12x1 |
| BT40-SF20-200 | 20 | 33 | 51 | 200 | 173 | 52 | 10 | M16x1 |
| BT40-SF25-200 | 25 | 44 | 53 | 200 | 173 | 58 | 10 | M16x1 |
| BT40-SF32-200 | 32 | 44 | 60 | 200 | 173 | 62 | 10 | M16x1 |
| BT50-SF03-100 | 3 | 15 | 20 | 100 | 62 | - | - | - |
| BT50-SF04-100 | 4 | 15 | 20 | 100 | 62 | - | - | - |
| BT50-SF05-100 | 5 | 15 | 20 | 100 | 62 | - | - | - |
| BT50-SF06-100 | 6 | 21 | 27 | 100 | 62 | 36 | 10 | M5 |
| BT50-SF08-100 | 8 | 21 | 27 | 100 | 62 | 36 | 10 | M6 |
| BT50-SF10-100 | 10 | 24 | 30.5 | 100 | 62 | 42 | 10 | M8x1 |
| BT50-SF12-100 | 12 | 24 | 30.5 | 100 | 62 | 47 | 10 | M10x1 |
| BT50-SF14-100 | 14 | 27 | 34 | 100 | 62 | 47 | 10 | M10x1 |
| BT50-SF16-100 | 16 | 27 | 34 | 100 | 62 | 50 | 10 | M12x1 |
| BT50-SF18-100 | 18 | 33 | 40 | 100 | 62 | 50 | 10 | M12x1 |
| BT50-SF20-100 | 20 | 33 | 40 | 100 | 62 | 52 | 10 | M16x1 |
| BT50-SF25-120 | 25 | 44 | 53 | 120 | 82 | 58 | 10 | M16x1 |
| BT50-SF32-120 | 32 | 44 | 53 | 120 | 82 | 62 | 10 | M16x1 |
| BT50-SF03-120 | 3 | 15 | 20 | 120 | 82 | - | - | - |
| BT50-SF04-120 | 4 | 15 | 20 | 120 | 82 | - | - | - |
| BT50-SF05-120 | 5 | 15 | 20 | 120 | 82 | - | - | - |
| BT50-SF06-120 | 6 | 21 | 27 | 120 | 82 | 36 | 10 | M5 |
| BT50-SF08-120 | 8 | 21 | 27 | 120 | 82 | 36 | 10 | M6 |
| BT50-SF10-120 | 10 | 24 | 32 | 120 | 82 | 42 | 10 | M8x1 |
| BT50-SF12-120 | 12 | 24 | 32 | 120 | 82 | 47 | 10 | M10x1 |
| BT50-SF14-120 | 14 | 27 | 34 | 120 | 82 | 47 | 10 | M10x1 |
| BT50-SF16-120 | 16 | 27 | 34 | 120 | 82 | 50 | 10 | M12x1 |
| BT50-SF18-120 | 18 | 33 | 42 | 120 | 82 | 50 | 10 | M12x1 |
| BT50-SF20-120 | 20 | 33 | 42 | 120 | 82 | 52 | 10 | M16x1 |
| BT50-SF03-160 | 3 | 15 | 25 | 160 | 122 | - | - | - |
| BT50-SF04-160 | 4 | 15 | 25 | 160 | 122 | - | - | - |
| BT50-SF05-160 | 5 | 15 | 25 | 160 | 122 | - | - | - |
| BT50-SF06-160 | 6 | 21 | 32 | 160 | 122 | 36 | 10 | M5 |
| BT50-SF08-160 | 8 | 21 | 32 | 160 | 122 | 36 | 10 | M6 |
| BT50-SF10-160 | 10 | 24 | 34 | 160 | 122 | 42 | 10 | M8x1 |
| BT50-SF12-160 | 12 | 24 | 34 | 160 | 122 | 47 | 10 | M10x1 |
| BT50-SF14-160 | 14 | 27 | 42 | 160 | 122 | 47 | 10 | M10x1 |
| BT50-SF16-160 | 16 | 27 | 42 | 160 | 122 | 50 | 10 | M12x1 |
| BT50-SF18-160 | 18 | 33 | 49 | 160 | 122 | 50 | 10 | M12x1 |
| BT50-SF20-160 | 20 | 33 | 49 | 160 | 122 | 52 | 10 | M16x1 |
| BT50-SF25-160 | 25 | 44 | 60 | 160 | 122 | 58 | 10 | M16x1 |
| BT50-SF32-160 | 32 | 44 | 60 | 160 | 122 | 62 | 10 | M16x1 |
| BT50-SF06-200 | 6 | 21 | 32 | 200 | 162 | 36 | 10 | M5 |
| BT50-SF08-200 | 8 | 21 | 32 | 200 | 162 | 36 | 10 | M6 |
| BT50-SF10-200 | 10 | 24 | 34 | 200 | 162 | 42 | 10 | M8x1 |
| BT50-SF12-200 | 12 | 24 | 34 | 200 | 162 | 47 | 10 | M10x1 |
| BT50-SF14-200 | 14 | 27 | 42 | 200 | 162 | 47 | 10 | M10x1 |
| BT50-SF16-200 | 16 | 27 | 42 | 200 | 162 | 50 | 10 | M12x1 |
| BT50-SF18-200 | 18 | 33 | 51 | 200 | 162 | 50 | 10 | M12x1 |
| BT50-SF20-200 | 20 | 33 | 51 | 200 | 162 | 52 | 10 | M16x1 |
| BT50-SF25-200 | 25 | 44 | 60 | 200 | 162 | 58 | 10 | M16x1 |
| Size | d | D | D1 | L | L2 | L1 | N | G |
| BT30-SF1/4"-3.15" | 1/4" | 0.83" | 1.06" | 3.15" | 2.28" | 1.42" | 0.39" | M5 |
| BT30-SF3/8"-3.15" | 3/8" | 0.95" | 1.26" | 3.15" | 2.28" | 1.65" | 0.39" | M8 x 1 |
| BT30-SF1/2"-3.15" | 1/2" | 0.94" | 1.34" | 3.15" | 2.28" | 1.85" | 0.39" | M10 x 1 |
| BT30-SF5/8"-3.15" | 5/8" | 1.06" | 1.34" | 3.15" | 2.28" | 1.97" | 0.39" | M12 x 1 |
| BT30-SF3/4"-3.15" | 3/4" | 1.29" | 1.62" | 3.15" | 2.28" | 2.04" | 0.39" | M16 x 2.0 |
| BT40-SF3/16"-3.54 | 3/16" | 0.43" | 0.75" | 3.54" | 2.67" | 0.79" | - | M6 x 1.0 |
| BT40-SF1/4"-3.54 | 1/4" | 0.82" | 1.06" | 3.54" | 2.67" | 1.42" | 0.39" | M5 x 0.8 |
| BT40-SF3/8"-3.54 | 3/8" | 0.94" | 1.25" | 3.54" | 2.67" | 1.65" | 0.39" | - |
| BT40-SF1/2"-3.54 | 1/2" | 1.10" | 1.34" | 3.54" | 2.67" | 1.85" | 0.39" | M10 x 1.5 |
| BT40-SF5/8"-3.54 | 5/8" | 1.06" | 1.34" | 3.54" | 2.67" | 1.96" | 0.39" | M12 x 1.75 |
| BT40-SF3/4"-3.54 | 3/4" | 1.29" | 1.65" | 3.54" | 2.67" | 2.04" | 0.39" | M16 x 2.0 |
| BT40-SF1.0"-3.54 | 1.0" | 1.73" | 2.08" | 3.54" | 2.67" | 2.28" | 0.39" | M20 x 2.0 |
| BT40-SF1-1/4"-4.13 | 1-1/4" | 1.81” | 2.08" | 4.13" | 3.26" | 2.28" | 0.39" | M20 x 2.0 |
| BT40-SF1/8"-6.3" | 1/8" | 0.36" | 0.63" | 6" | 5.13" | 0.70" | - | M6 x 1.0 |
| BT40-SF3/16"-6.3" | 3/16" | 0.43" | 0.70" | 6" | 5.13" | 0.79" | - | M6 x 1.0 |
| BT40-SF1/4"-6.3" | 1/4" | 0.49" | 0.83" | 6" | 5.13" | 1.42" | 0.39" | M5 x 0.8 |
| BT40-SF3/8"-6.3" | 3/8" | 0.61" | 0.94" | 6" | 5.13" | 1.65" | 0.39" | M8 x 1.25 |
| BT40-SF1/2"-6.3" | 1/2" | 0.74" | 1.06" | 6" | 5.13" | 1.85" | 0.39" | M10 x 1.5 |
| BT40-SF5/8"-6.3" | 5/8" | 1.06" | 1.34" | 6" | 5.13" | 1.96" | 0.39" | M12 x 1.75 |
| BT40-SF3/4"-6.3" | 3/4" | 1.29" | 1.65" | 6" | 5.13" | 1.65" | 0.39" | M16 x 2.0 |
| BT40-SF1"-6.3" | 1" | 1.73" | 2.09" | 6" | 5.13" | 2.28" | 0.39" | M20 x 2.0 |
