Tsubaki’s new BS-F Series backstops are designed for simple, drop-in installation to all major competitive external, low-speed backstop products. These backstops use a unique labyrinth seal design for maximum life with minimal maintenance. With Tsubaki’s innovative design features, our backstops ensure efficient and dependable operation in the harshest environments.
TYPICAL APPLICATIONS
COMMON INDUSTRIES
MINING
POWER GENERATING PLANTS
CEMENT
PORTS
INNOVATIVE FEATURES:
NON-ROLLOVER CAM
SPECIAL LABYRINTH SEAL
Superior Performance in the Harshest Environments
GREASE LUBRICATION
DROP IN DESIGN
3 STEP
EASY CONNECTION
Step 1: Insert I-beam torque arm into clutch
Step 2: Insert lock pins through flange plate and secure torque arm
Step 3: Insert retaining pins into lock pins 
Bore Range - Max. |
N/A 3.350 in85.00 mm |
Bore Range - Min. |
N/A 2.360 in60.00 mm |
Torque Capacity |
N/A 4980 lb·ft6760 N·m |
Inner Race Max. Overrunning Speed |
N/A 300 rpm |
Drag Torque |
N/A 6.000 lb·ft8.00 N·m |
A - Backstop width |
N/A 4.210 in107.00 mm |
B - Overall length |
N/A 8.270 in210.00 mm |
C - Inside width |
N/A 4.13 in105.00 mm |
D - Center line of backstop to flange edge |
N/A 5.940 in151.00 mm |
E - Counterbore inside diameter |
N/A 4.170 in106.00 mm |
F - Overall inner race width |
N/A 4.720 in120.00 mm |
G - Counterbore depth |
N/A 0.300 in7.50 mm |
H - Overall backstop width |
N/A 5.000 in127.00 mm |
J - Distance from backstop center line to I-beam edge |
N/A 32.010 in813.00 mm |
K - Torque arm height |
N/A 2.990 in76.00 mm |
L - Torque arm width |
N/A 2.520 in64.00 mm |
Amount of grease |
N/A 0.140 lb0.065 kg |
Weight - With Torque Arm - Min. Bore |
N/A 94.600 lb43.000 kg |
Weight - With Torque Arm - Max. Bore |
N/A 88.000 lb40.000 kg |
Weight - Without Torque Arm - Min. Bore |
N/A 68.200 lb31.000 kg |
Weight - Without Torque Arm - Max.. Bore |
N/A 61.600 lb28.000 kg |