Material

• Nut Body: SS400 Steel (or equivalent).
• Friction Ring: 301 Stainless Steel.

Perpendicularity of Bearing Surface: 0.07.

Thread Accuracy: ISO 6H (JIS Class 2).

Other Info.

• A lead in chamfer equivalent to one thread pitch is required.
• The screw thread should be to ISO 965 (Class 6g tolerance).
• Lubricate the shaft before assembly or removal of the nut. With shafts of low hardness use a high performance lubricant.
• To maximise effectiveness, ensure there are at least two full threads beyond the friction ring.
• The squareness specified for the mating face is achieved with a tightening torque equivalent to x2 the prevailing torque.
• Do not use a high rotational speed impact wrench.
• Do not use the nuts on shafts with keyways.
• Do not screw in the nut from the friction ring side.
• Stop using the nut when excessive deformation or other fault is found in the friction ring and the clamp.
• For severe or unusual applications please contact our Technical department.

Construction & Function: FU-SS locknuts are one piece items where the locking function is performed by a spring peened into the top of the nut. In use, the spring bears on the flank of the shaft thread with force (P) generating reaction force (P*) in the screw threads with a resulting high friction torque (prevailing torque). The nut therefore remains locked in position.

Extras

FU-SC Type (High Carbon Steel S45C-H or equivalent), and
FU-SUS Type (304 Stainless Steel or equivalent) available, P.O.A.
FU-SC Type also available in larger sizes: FU21SC to FU30SC (M105 to M150), P.O.A.

Socket Tools, P.O.A.

Features

• Unique slim body design
• Secure locking without keyway and tab washer
• Improved shaft strength and balance
• Simple infinite adjustment
• Re-usable up to 100 times.
• Resists vibration and shock
• Equally effective for rotation in either direction even with rapid reversals
• One piece construction allows simpler, quicker assembly