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PSS 02-120M-634 - Dripless Shaft Seal 120 mm, 6 3/4" Stern Tube
The PSS 02-120M-634 Dripless Shaft Seal is engineered for optimal performance in marine applications. This Type B shaft seal employs a mechanical face seal design that ensures reliable sealing and minimal leakage.
The sealing mechanism consists of a flat interface between a rotating stainless-steel rotor and a stationary carbon flange. The carbon flange is securely attached to the front of the bellow using hose clamps, while the bellow itself fits snugly over the stern tube and is also secured with hose clamps. The stainless-steel rotor, mounted on the shaft in front of the carbon flange, compresses the bellow before being fastened to the shaft with set-screws. This pre-load maintains consistent contact between the rotor and flange, compensating for movement caused by propeller thrust.
Designed to accommodate misalignments and vibrational issues, the carbon flange is over-bored to allow it to "float" around the shaft. The rotor is sealed with two recessed O-rings that rotate with the shaft, minimizing wear during operation.
Specifications
- Temperature Limits: -13°F to 425°F (-25°C to 220°C)
- Pressure Limits: 50 PSI (3.5 BAR)
- Shaft RPM Limits: 7,000 RPM
- Carbon Graphite: Lapped to 4 HLB (0.000044" tolerance)
- 316SS / Nitronic 50: Faced to 9-12 Ra
- Bellows Material: Mandrel formed silicone / fabric
Part Details
- Part #: 02-120M-634
- Shaft Dia. (A): 120mm
- Stern Tube Dia. (B): 6-3/4" to 6-7/8"
- Approx. Length (C): 13.742"
- Approx. Compression: 1" to 1-1/4"
- Rotor Diameter (D): 7.875"
- Stern Cuff Length (E): 2.5"
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