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BT Taper Retention Knobs with Coolant Hole
 |  |
Knob with Pilot |
Lock tool holders in place on CNC machines with a through-spindle coolant (TSC) system. They fit machines with a BT taper spindle. All meet industrial standards for tensile and shear strength. Also known as pull studs. These knobs have a pilot, which ensures precise alignment between the tool holder and spindle, reducing vibration and runout. To ensure compatibility with your machine, compare the features on these knobs, such as the location of O-ring seals and the pilot design, to those on your current knob. To upgrade a standard knob to one with a pilot, confirm that the pilot diameter is small enough to fit in your tool holder without touching the inner walls where the knob seats.
Use a torque wrench with a retention knob socket or a changeable-head torque wrench to tighten them.
Flange O-Ring Included—Knobs with flange O-rings block external coolant from entering your machine spindle. Match the O-ring placement and style to your current setup to ensure optimal sealing and performance.
Grip Angle—Grip angle is the sloped part of the knob that the machine grips to secure the tool holder. A 15˚ grip angle is sometimes referred to as a 75˚ grip angle. A 30˚ grip angle is sometimes referred to as a 60˚ grip angle.
Grip Angle | Projection | Head Dia. | Coolant Hole Diameter | Pilot Dia. | Collar Dia. | Head-to-Flange Lg. | Flange Thk. | Torque Range, ft·lbf | O-Rings Included | Mfr. | Mfr. Model No. | Mfr. Equiv. Model No. | Specs. Met | JIS Specification | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
BT 40 Machine Taper | ||||||||||||||||||
M16 × 2 mm | ||||||||||||||||||
| 15° | 1.136" | 0.746" | 0.264" | 0.669" | 0.505" | 0.9" | 0.157" | 45 to 55 | — | T.J. Davies | PSC-480X15 | 711-22, 21130-C, 71122, DIN40ATRK, RS4M-0114-C | ISO 7388-3 | JIS B 6339 | 9487N16 | 000000 | ||
| 15° | 1.136" | 0.746" | 0.264" | 0.669" | 0.505" | 0.9" | 0.157" | 45 to 55 | Flange O-Ring, Head O-Ring in Coolant Hole | T.J. Davies | PSCO-480X15A | B40-1500 Mori EU, HPS-366E-1 | ISO 7388-3 | JIS B 6339 | 9487N15 | 00000 | ||
| 15° | 1.141" | 0.746" | 0.264" | 0.669" | 0.505" | 0.905" | 0.275" | 45 to 55 | — | T.J. Davies | PSC-444X15 | 40PH, 329-13, 21101-C, 32913, B40-1500 H, HPS-806-1, RS4M-0205-C | ISO 7388-3 | JIS B 6339 | 9487N17 | 00000 | ||
| 30° | 1.378" | 0.588" | 0.166" | 0.669" | 0.505" | 1.1" | 0.236" | 45 to 55 | — | T.J. Davies | PSC-444X60 | 311-13E, 4004TRKC, 17820, 31113E, B40-6000 H, HPS-2 C, RB4M-0002-C | — | JIS B 6339 | 9487N22 | 00000 | ||
| 45° | 0.752" | 0.74" | 0.264" | 0.669" | 0.505" | 0.552" | 0.120" | 45 to 55 | — | T.J. Davies | PSC-479 | 312-25, 21129-C, 31225, HPS-G51, MZ40TRKC, PS-G51 | ASME B5.50, ISO 7388-3 | JIS B 6339 | 9487N18 | 00000 | ||
| 45° | 0.752" | 0.74" | 0.264" | 0.669" | 0.505" | 0.552" | 0.236" | 45 to 55 | — | T.J. Davies | PSC-477 | 111-26A, 11126A, 21105-C, B40-FADAL C, F40TRKC, RS4M-0115-C | ASME B5.50, ISO 7388-3 | JIS B 6339 | 9487N19 | 00000 | ||
| 45° | 1.378" | 0.588" | 0.166" | 0.669" | 0.505" | 1.1" | 0.236" | 45 to 55 | — | T.J. Davies | PSC-444X45 | 311-13D, 4003TRKC, 17818, 31113D, B40-4500 H, HPS-1C, RB4M-0001-C | — | JIS B 6339 | 9487N21 | 00000 | ||
| 90° | 1.378" | 0.588" | 0.166" | 0.669" | 0.505" | 1.1" | 0.236" | 45 to 55 | — | T.J. Davies | PSC-444X90 | 311-13F, 4002TRKC, 17822, 31113F, B40-9000 H, HPS-08 C, RB4M-0003-C | — | JIS B 6339 | 9487N23 | 00000 | ||
BT Taper Retention Knobs
 |  |
Knob with Pilot |
Lock tool holders in place on CNC machines with a BT taper spindle. All meet industrial standards for tensile and shear strength. These knobs are also known as pull studs. They have a pilot, which ensures precise alignment between the tool holder and spindle, reducing vibration and runout. To ensure compatibility with your machine, compare the features on these knobs, such as the pilot design, to those on your current knob. If you want to upgrade a standard knob to one with a pilot, confirm that the pilot diameter is small enough to fit in your tool holder without touching the inner walls where the knob seats.
Use a torque wrench with a retention knob socket or a changeable-head torque wrench to tighten them.
Grip Angle—Grip angle is the sloped part of the knob that the machine grips to secure the tool holder. A 15˚ grip angle is sometimes referred to as a 75˚ grip angle. A 30˚ grip angle is sometimes referred to as a 60˚ grip angle.
Grip Angle | Projection | Head Dia. | Pilot Dia. | Collar Dia. | Head-to-Flange Lg. | Flange Thk. | Torque Range, ft·lbf | Mfr. | Mfr. Model No. | Mfr. Equiv. Model No. | Specs. Met | JIS Specification | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
BT 40 Machine Taper | ||||||||||||||||
M16 × 2 mm | ||||||||||||||||
| 15° | 1.141" | 0.746" | 0.669" | 0.505" | 0.905" | 0.275" | 45 to 55 | T.J. Davies | PS-444X15 | 40PH, 329-12, 4020NTRK, 21101, 32912, B40-1500, HPS-805, PS-805, RS4M-0205 | — | JIS B 6339 | 9485N17 | 000000 | ||
| 30° | 1.378" | 0.588" | 0.669" | 0.505" | 1.1" | 0.236" | 45 to 55 | T.J. Davies | PS-444X60 | 311-13A, 4004TRK, 17808, 31113A, B40-6000, HPS-2, RB4M-0002 | — | JIS B 6339 | 9485N22 | 00000 | ||
| 45° | 0.752" | 0.74" | 0.669" | 0.505" | 0.552" | 0.236" | 45 to 55 | T.J. Davies | PS-477 | 111-26, 11126, 21105, B40-FADAL, F40TRK, RS4M-0115 | ASME B5.50, ISO 7388-3 | JIS B 6339 | 9485N18 | 00000 | ||
| 45° | 1.378" | 0.588" | 0.669" | 0.505" | 1.1" | 0.236" | 45 to 55 | T.J. Davies | PS-444X45 | 311-13, 4003TRK, 17803, 31113, B50-4500, HPS-1, P40T-1, PS-70, RB4M-0001 | — | JIS B 6339 | 9485N19 | 00000 | ||
| 45° | 1.546" | 0.592" | 0.669" | 0.505" | 1.25" | 0.187" | 45 to 55 | T.J. Davies | PS-554 | 171-26, 17126, 21116 | ASME B5.50, ISO 7388-3 | JIS B 6339 | 9485N21 | 00000 | ||
| 90° | 1.378" | 0.588" | 0.669" | 0.505" | 1.1" | 0.236" | 45 to 55 | T.J. Davies | PS-444X90 | 311-13B, 4002TRK, 17814, 31113B, B40-9000, HPS-08, POM40F, POM40MG, RB4M-0003 | — | JIS B 6339 | 9485N23 | 00000 | ||
Torque Wrenches for CNC Retention Knobs
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Prevent damage to CNC spindles and tool holders when installing knobs. These wrenches torque retention knobs to manufacturer specs to avoid overtightening that can bend or misalign your setup. Set your torque and the wrench signals when it’s reached with an audible click and an impulse in the grip. All come with a calibration certificate, which includes test measurements that confirm accuracy.
For Machine Taper No. | Drive Size | Torque | Graduations | Opening Angle | Clockwise Accuracy | Mfr. | For Mfr. Model No. | Overall Lg. | Specs. Met | Certificate Type | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Round Open End Heads—Nonratcheting | ||||||||||||||
ft·lbf, N-m | ||||||||||||||
| CAT 40 BT 40 | 3/4" | 30 ft·lbf to 150 ft·lbf 47 N-m to 197 N-m | 1 ft·lbf 1.4 N-m | Straight | ±4% | Lyndex Nikken | C40-1500 C40-1500(R) C40-1500-MORI C40-STD C40S-4500 C40S-4500(H) C40S-6000 PS-B64-1 B40-1500 B40-1500(R) B40-1500-MORI B40-4500 B40-4500(H) B40-FADAL | 21 1/4" | ASME B107.14M, ISO 6789 | Calibration Certificate with Test Data Traceable to DIN | 6643N2 | 0000000 | ||
