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CB Cutlass Bearings Australia
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Cutlass Bearings for an 80 mm Shaft

We list three Exalto cutlass bearings for an 80 mm (3.15") propeller shaft, in phenolic, brass and GRP. They fit a 100 mm (3.937") housing bore, and every one is 320 mm (12.598") long. The nominal wall is 10 mm thick: half the difference between housing bore and shaft.

Of these, one is in Australian stock (the phenolic MPSF80), with same-day dispatch on orders placed by 2pm AEST on a business day. You can pre-order the other two, with dispatch estimated at 3 to 4 weeks. Prices run from $550.00 (the phenolic MPSF80) to $1,250.00 including GST, and Express Post delivery within Australia is free.

The nearest imperial shaft size we list, 3-1/4" (82.55 mm), is 2.55 mm larger and takes different bearings. Keep the shaft size in the unit it was made to: 80 mm is 3.15", and metric and imperial bearings of a similar size are not interchangeable.

Show sizes as

3 bearings for an 80 mm shaft

Code Housing bore Length Material Availability Price inc GST Order
MPSF80 100 mm 3.937" 320 mm 12.598" Phenolic In stock (1) $550.00
MBSF80 100 mm 3.937" 320 mm 12.598" Brass Dispatch in 3 to 4 weeks $1,250.00
MGSF80 100 mm 3.937" 320 mm 12.598" GRP Dispatch in 3 to 4 weeks $670.00

How to choose a bearing for an 80 mm shaft

Measure the housing bore and the length of the bearing you are replacing, then find that combination below. Every bearing here shares one housing bore and length; they differ in shell material, tolerances and availability.

  • 100 mm (3.937") housing, 320 mm (12.598") long: phenolic MPSF80 (in stock, $550.00), brass MBSF80 (dispatch in 3 to 4 weeks, $1,250.00), GRP MGSF80 (dispatch in 3 to 4 weeks, $670.00)

Phenolic, brass and GRP describe the outer shell, and each has a grooved nitrile rubber lining. The non-metallic phenolic shell avoids galvanic corrosion between the shell and a metal housing. Exalto advises against fitting brass directly into steel or aluminium housings. Exalto identifies GRP as suitable for steel and aluminium stern tubes as well as compatible non-metallic housings. More about each: phenolic cutlass bearings, brass cutlass bearings and GRP cutlass bearings.

Matching sizes is the first check, not the last: confirm the shell material, the housing's condition and the retention method for your boat. The measuring guide explains what to record, or contact us with your measurements.

Other shaft sizes