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No. 120, B Style, 1.375" plain bore
Has recessed groove in hub for chain clearance

All dimensions are nominal values and for reference only
Unit of Measure


Stock Bore Diameter

N/A 1.375 in
Hub Diameter1 N/A 3.750 in


N/A 2.250 in



No. Teeth

N/A 10

Outside Diameter

N/A 5.520 in

Pitch Diameter

N/A 4.854 in

Caliper Diameter

N/A 3.979 in
Max. Bore2 N/A 2.250 in


N/A 7.100 lb

Tooth Nominal Width

N/A 0.924 in

Hardened Teeth

N/A Yes

Chain Technical Data


N/A 1.500 in

Chain Size

N/A 120
  • 1 Hub diameter may vary to suit bore sizes
  • 2 Dimensions shown allow for standard key way with set screw at 90°
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