URL :  http://www.fun.co.jp

The FUJILOK U-NUT consists of a nut and friction ring. The friction ring (specialized spring) is integrated with the top face of the nut.

When the nut is tightened, the friction ring touches the bolt screw threads.

The friction ring then begins to bend along with the screw threads and presses against the bolt screw threads surface.

Stress produced through a spring effect and a reaction force that presses against the bolt thread are produced.

This creates the locking operation.

1. Tightening is done using the same method as a normal nut.

2. The friction ring touches the bolt and this produces prevailing torque.

 3. Spring-effect stress is utilized, and this prevents bolt thread damage.

4. Fastening is complete.

  Features

*Provides a stable locking function.

*Prevents nuts from quickly coming off even if the tightening force is lowered.

*An all-metal product that has excellent resistance to heat and low temperatures.

*Easy tightening prevents installation mistakes.

*Can be reused.

  Spring steel friction ring

  60° 3-wing ring structure (up to M6)

  90° 2-wing ring structure (M8 and above)

 Accuracy

  Thread accuracy: JIS6H

  Shape

 Single chamfer (one side) nuts, double chamfer (both sides) nuts, thin type (low) nuts, small nuts

 flange nuts, domed nuts, weld nuts, other specially shaped nuts

 Material

 SS400 or equivalent = low carbon steel, S45C (heat-treated) = high carbon steel (H.T.), SCM435 (heat-treated), SUS304 or equivalent = stainless steel 304 (A2),

  SUS316L or SUS316 = stainless steel 316 (A4), brass, and other specialized materials

  Surface treatment

 Plain, hexavalent white zinc, hexavalent yellow zinc, hexavalent black zinc, hexavalent green zinc, hexavalent zinc and nickel alloy + K coat, hot dip galvanizing, trivalent yellow zinc, trivalent black zinc, trivalent zinc and nickel alloy + K coat, black oxide coating, Lubrite treatment