Johnson Cutless Bearings

NCB Shaft Sleeves

Nickel-Chrome-Boron hard-coated shaft sleeves that protect tail shafts and rudder stocks and extend shaft and bearing wear life by as much as 4 to 5 times.

NCB alloy coating resists abrasion and corrosion.

58 to 62 Rockwell "C" hardness also extends bearing life.

Supplied finished-bore, ready to shrink fit, or rough-bore for machining.

Option	Bore Condition	Installation	Information Required
Finished Bore	Machined to final size	Shrink fit, no bore machining	Shaft diameter dimensions
Rough Bore	Oversize bore	Machined to fit before installation	Approximate shaft size

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Design

The fused area of the sleeve is undercut and thermally coated with Nickel-Chrome-Boron powder, then heat treated.

Application

Tail shafts and rudder stocks running in water-lubricated bearings.

Performance

Guaranteed to double the life of shafts in conventional materials such as 316 or heat-treated 410 stainless.

Scope of Delivery

Sleeves are made to order; send us the shaft dimensions to quote.

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