Polastorm 3-blade stainless steel propeller for 40–140 hp is a right-hand rotating Star propeller for outboard motors with a 4 1/4″ gearcase. This variant has a diameter of 13″ and a pitch of 19″.
The three-blade propeller features an interchangeable hub system and is designed for installation with a motor-specific Polaflex hub kit. The central hub and damper are not included and must be selected separately based on engine make, engine model, gearcase, shaft, and number of splines. A complete hub kit usually includes a damper, thrust washer, front spacer, shim, and nut.
The propeller is manufactured from ASTM A890-4A duplex stainless steel through precision casting followed by solution heat treatment. The relatively high chromium content contributes to the material's corrosion resistance. Material data for this stainless Polastorm series includes a tensile strength of 680 MPa, yield strength of 450 MPa, elongation at break of 25%, and a hardness of 26 HRC; these values are general material data and not an individual measurement report for the specific propeller.
The spiral-shaped through-hub exhaust design directs the engine exhaust through the propeller hub. The 13″ diameter corresponds to 330.2 mm, while the 19″ pitch corresponds to a theoretical advance of 482.6 mm per revolution without slip.
The propeller family is intended for the 40–140 hp engine group with a 4 1/4″ gearcase, corresponding to 108 mm. It is recommended for relevant motors from Yamaha, Selva, Mercury, Honda, and Tohatsu, but the specific fitment always depends on the correct motor-specific hub kit. For Yamaha installations, hub kit F22, item no. 52.581.02, may be relevant for documented 4 1/4″ engines with 15 splines. For documented Tohatsu and Nissan engines, hub kit F30, item no. 52.585.02, may be relevant. Motor-specific compatibility must be verified before ordering.
The Star geometry is comparable to the Solas New Saturn and Solas Rubex NS3. This reference describes the propeller family and geometry and is not an OEM number or documentation of universal fitment without a proper hub kit.
Key featuresThree-blade Star propeller
Diameter × pitch: 13 × 19″
Right-hand standard rotation
ASTM A890-4A duplex stainless steel
Precision cast and solution heat treated
Interchangeable hub system
Spiral through-hub exhaust
For 40–140 hp and 4 1/4″ gearcase
Motor-specific hub kit and damper sold separately
Always check the engine/gearcase model, shaft, number of splines, and the required hub kit before purchasing.
