Shimano Nexus Inter-8 Dealer's Manual page 16

< In the case of coaster brake specifications >
WARNING
• When securing the brake arm to the frame, be sure to use a brake arm clip that matches the size of the chainstay, and
securely tighten them with the clip screw and clip nut to the specified tightening torque.
Use a lock nut with a nylon insert (self-locking nut) for the clip nut. It is recommended that standard Shimano parts be used
for the clip screw, clip nut and brake arm clip.
If the clip nut comes off the brake arm, or if the clip screw or brake arm clip becomes damaged, the brake arm may rotate on
the chainstay and cause the handlebars to jerk suddenly, or the bicycle wheel may lock and the bicycle may fall over, causing
serious injury.
Note:
• When installing the brake arm clip, securely tighten the clip screw while holding the clip nut with a 10 mm spanner.
• After installing the brake arm clip, check that the clip screw protrudes
about 2 - 3 mm from the surface of the clip nut.
• Before using the Coaster Brake, check that the brake works properly and that the wheel turns smoothly.
Tightening torque:
2.0 - 3.0 N·m {17 - 26 in. lbs.}
16
Clip nut
Brake arm
Brake arm clip
Chainstay
Brake arm
Brake arm clip
Clip nut
Clip screw
(M6 × 16 mm)
2 − 3 mm
Clip screw