{"title":"Shaft Seals","description":"\u003cp\u003eShop Shaft Seals for marine maintenance, repair, replacement, and upgrade projects. Compare available products by manufacturer part number, dimensions, materials, compatibility, and installation requirements so you can narrow the options for your boat, engine, trailer, or onboard system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Confirm the manufacturer part number and application details before ordering, then review the product specifications for exact fit and installation requirements. For compatibility questions, contact Marine Parts Only with your equipment details and the part number you are replacing.\u003c\/p\u003e","products":[{"product_id":"pss-shaft-seal-1-1-2-inch-shaft-with-2-5-8-inch-stern-tube-marine-mechanical-seal","title":"PSS Shaft Seal 1-1\/2 Inch Shaft with 2-5\/8 Inch Stern Tube - Marine Mechanical Seal","description":"\u003cb\u003ePSS Shaft Seal 1-1\/2\" Shaft 2-1\/2\" Tube\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eShaft Diameter:\u003c\/b\u003e 1-1\/2\"\u003cbr\u003e\u003cb\u003eStern Tube Diameter (D):\u003c\/b\u003e 2-1\/2\" to 2-5\/8\"\u003cbr\u003e\u003cb\u003eTotal Length (A):\u003c\/b\u003e 9.175\"\u003cbr\u003e\u003cb\u003eTotal Length (compressed) (Compressed A):\u003c\/b\u003e 8.175\"\u003cbr\u003e\u003cb\u003eRotor Diameter (B):\u003c\/b\u003e 3.75\"\u003cbr\u003e\u003cb\u003eCarbon Cuff Diameter (C):\u003c\/b\u003e 3.25\"\u003cbr\u003e\u003cb\u003eStern Cuff Length (E):\u003c\/b\u003e 2\"\u003cbr\u003e\u003cbr\u003e\u003cb\u003eThe PSS Shaft Seal\u003c\/b\u003e is the number one selling marine mechanical seal worldwide and is installed as standard equipment by many of the worlds most reputable boat builders \/ yards. The PSS Shaft Seal is also recognized as the premiere retrofit (aftermarket) seal on the world market. Certified by Bureau Veritas, ABS \u0026amp; Rina: Boat builders \/ yards recognize the advantages and value of installing the PSS as it eliminates the maintenance, constant adjustment \u0026amp; cost associated with traditional packing type glands. Aside from these benefits, the PSS Shaft Seal helps to eliminate water in the bilge (100% water tight) \u0026amp; wear to the propeller shaft. The PSS Shaft Seal can be easily retrofitted and is available for shafts ranging from 3\/4\" (20mm) to 6\" (150mm).\u003cbr\u003e\u003cbr\u003e\u003cb\u003eThe PSS Shaft Seal\u003c\/b\u003e is a mechanical face seal that is created between the flat surfaces of the rotating stainless steel rotor and the stationary carbon flange. The stationary carbon flange is attached to the vessels stern tube with hose clamps and the carbon flange is attached to the front side of the bellows with hose clamps. The stainless steel rotor is fit on the shaft in front of the carbon flange. The stainless steel rotor is used to compress the bellows before the collar is secured to the shaft with set-screws. This compression (pre-load) maintains contact between the faces and allows the PSS to compensate for the thrust from the propeller. The carbon flange is bored larger than the shaft diameter allowing it to \"float\" around the shaft and thus compensate for most misalignment and vibration problems. The stainless steel collar is sealed to the shaft by two o-rings that are recessed into the bore of the collar. These o-rings rotate with the shaft and stainless steel rotor and do not experience wear during operation.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e**As with any rubber hose below waterline, the PSS bellows must be inspected on a regular basis for any sign of wear, aging or chemical deterioration. PYI suggests as preventative maintenance that the PSS bellow be replaced in six year intervals. During bellows replacement it is recommended the o-rings \u0026amp; set screws in the stainless steel rotor also be replaced.\"\u003cbr\u003e\u003cbr\u003eBellows may need to be more frequently inspected in an environment where non-sealed batteries emit sulfuric acid. Sulfuric acid vapor will accelerate rubber deterioration, as will an ozonater.\u003cbr\u003e\u003cbr\u003eThe Maintenance Kit includes the items you need to properly maintain your PSS Shaft Seal. Included in the kit is one (1) PSS bellow, two (2) O-rings, five (5) set screws, four (4) new hose clamps and an allen key. \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003eThe PSS Shaft Seal 1-1\/2 inch shaft with a 2-5\/8 inch stern tube diameter is a top-rated marine mechanical seal designed for reliable, maintenance-free operation. Recognized worldwide as the best-selling marine shaft seal, the PSS is installed as standard equipment by many leading boat builders and yards, and it offers an excellent retrofit solution for existing systems. Certified by Bureau Veritas, ABS, and RINA, this seal enhances vessel performance by providing a 100% watertight barrier that prevents water ingress into the bilge while reducing wear on the propeller shaft.\u003c\/p\u003e\u003cp\u003eConstructed as a mechanical face seal, the PSS features a stainless steel rotor that creates a tight seal against a stationary carbon flange. The carbon flange is attached to the vessel’s stern tube, and the rotor is mounted on the shaft with set screws, ensuring secure and precise contact. The design allows for easy installation and alignment, with a floating carbon flange that accommodates shaft misalignment and vibration, thereby extending the seal’s lifespan and maintaining optimal performance. Pre-loading the rotor ensures consistent contact between the sealing faces, providing a durable seal that compensates for propeller thrust.\u003c\/p\u003e\u003cp\u003eThe PSS Shaft Seal is suitable for shafts ranging from 3\/4 inch (20mm) up to 6 inches (150mm), making it versatile across various vessel sizes. Its robust design and high-quality materials make it a preferred choice for boat owners seeking a reliable, low-maintenance solution. Regular inspection of the bellows is recommended, especially in environments with sulfuric acid vapor or ozone exposure, which can accelerate deterioration. The included maintenance kit provides all necessary components—bellows, O-rings, set screws, hose clamps, and an Allen key—for routine upkeep, with a suggested replacement interval of six years to ensure optimal performance.\u003c\/p\u003e\u003cp\u003eWhether upgrading an existing system or installing a new seal, the PSS Shaft Seal offers a proven, corrosion-resistant, and efficient sealing solution that minimizes water intrusion and shaft wear. Its ease of retrofit, certification standards, and durable construction make it the ideal choice for demanding marine applications, providing peace of mind and long-lasting protection for your vessel’s propulsion system.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eShaft Diameter: 1-1\/2 inch for versatile marine installation\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eStern Tube Compatibility:\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\n\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eTruck Freight: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eOversized: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cbr\u003e\n\u003c\/li\u003e\u003c\/ul\u003e","brand":"PSS Shaft Seal","offers":[{"title":"Default Title","offer_id":44253596188761,"sku":"50850","price":511.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/50850XL.jpg?v=1785353376"},{"product_id":"pss-shaft-seal-2-inch-shaft-with-3-1-4-inch-tube-for-marine-propulsion-systems","title":"PSS Shaft Seal 2-Inch Shaft with 3-1\/4-Inch Tube for Marine Propulsion Systems","description":"\u003cb\u003ePSS Shaft Seal 2\" Shaft 3-1\/4\" Tube\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eShaft Diameter:\u003c\/b\u003e 2\"\u003cbr\u003e\u003cb\u003eStern Tube Diameter (D):\u003c\/b\u003e 3-1\/4\" to 3-3\/8\"\u003cbr\u003e\u003cb\u003eTotal Length (A):\u003c\/b\u003e 9.175\"\u003cbr\u003e\u003cb\u003eTotal Length (compressed) (Compressed A):\u003c\/b\u003e 8.175\"\u003cbr\u003e\u003cb\u003eRotor Diameter (B):\u003c\/b\u003e 3.75\"\u003cbr\u003e\u003cb\u003eCarbon Cuff Diameter (C):\u003c\/b\u003e 3.25\"\u003cbr\u003e\u003cb\u003eStern Cuff Length (E):\u003c\/b\u003e 2\"\u003cbr\u003e\u003cbr\u003e\u003cb\u003eThe PSS Shaft Seal\u003c\/b\u003e is the number one selling marine mechanical seal \u003cbr\u003eworldwide and is installed as standard equipment by many of the worlds most \u003cbr\u003ereputable boat builders \/ yards. The PSS Shaft Seal is also recognized as \u003cbr\u003ethe premiere retrofit (aftermarket) seal on the world market. Certified by \u003cbr\u003eBureau Veritas, ABS \u0026amp; Rina: Boat builders \/ yards recognize the advantages \u003cbr\u003eand value of installing the PSS as it eliminates the maintenance, constant \u003cbr\u003eadjustment \u0026amp; cost associated with traditional packing type glands. Aside \u003cbr\u003efrom these benefits, the PSS Shaft Seal helps to eliminate water in the \u003cbr\u003ebilge (100% water tight) \u0026amp; wear to the propeller shaft. The PSS Shaft Seal \u003cbr\u003ecan be easily retrofitted and is available for shafts ranging from 3\/4\" \u003cbr\u003e(20mm) to 6\" (150mm).\u003cbr\u003e\u003cbr\u003e\u003cb\u003eThe PSS Shaft Seal\u003c\/b\u003e is a mechanical face seal that is created between \u003cbr\u003ethe flat surfaces of the rotating stainless steel rotor and the stationary \u003cbr\u003ecarbon flange. The stationary carbon flange is attached to the vessels stern tube with hose clamps and the carbon flange is attached to the front side of the bellows with hose clamps. The stainless steel rotor is fit on the shaft \u003cbr\u003ein front of the carbon flange. The stainless steel rotor is used to compress the bellows before the collar is secured to the shaft with set-screws. This \u003cbr\u003ecompression (pre-load) maintains contact between the faces and allows the \u003cbr\u003ePSS to compensate for the thrust from the propeller. The carbon flange is \u003cbr\u003ebored larger than the shaft diameter allowing it to \"float\" around the shaft and thus compensate for most misalignment and vibration problems. The \u003cbr\u003estainless steel collar is sealed to the shaft by two o-rings that are \u003cbr\u003erecessed into the bore of the collar. These o-rings rotate with the shaft \u003cbr\u003eand stainless steel rotor and do not experience wear during operation.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e**As with any rubber hose below waterline, the PSS bellows must be inspected on a regular basis for any sign of wear, aging or chemical deterioration. \u003cbr\u003ePYI suggests as preventative maintenance that the PSS bellow be replaced in \u003cbr\u003esix year intervals. During bellows replacement it is recommended the o-rings \u0026amp; set screws in the stainless steel rotor also be replaced.\"\u003cbr\u003e\u003cbr\u003eBellows may need to be more frequently inspected in an environment where \u003cbr\u003enon-sealed batteries emit sulfuric acid. Sulfuric acid vapor will accelerate rubber deterioration, as will an ozonater.\u003cbr\u003e\u003cbr\u003eThe Maintenance Kit includes the items you need to properly maintain your \u003cbr\u003ePSS Shaft Seal. Included in the kit is one (1) PSS bellow, two (2) O-rings, \u003cbr\u003efive (5) set screws, four (4) new hose clamps and an allen key. \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003eThe PSS Shaft Seal, part number 02-200-314 from PSS Shaft Seal, is a high-performance marine mechanical seal designed to provide a reliable, maintenance-free solution for shaft sealing needs. Engineered for shafts up to 6 inches in diameter, this seal is a preferred choice among leading boat builders and marine professionals worldwide. Recognized for its durability and ease of installation, the PSS Shaft Seal helps prevent water intrusion into the bilge and reduces wear on the propeller shaft, offering peace of mind during extended voyages and daily operations alike.\u003c\/p\u003e\u003cp\u003eConstructed with a robust design, the PSS Shaft Seal features a stainless steel rotor that\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\n\u003c\/p\u003e\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eTruck Freight: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eOversized: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"PSS Shaft Seal","offers":[{"title":"Default Title","offer_id":44253597073497,"sku":"50862","price":653.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/50862XL.jpg?v=1785353386"},{"product_id":"pss-shaft-seal-2-1-2-inch-shaft-for-4-inch-tube-marine-mechanical-seal-replacement","title":"PSS Shaft Seal 2-1\/2 inch Shaft for 4 inch Tube | Marine Mechanical Seal Replacement","description":"\u003cb\u003ePSS Shaft Seal 2-1\/2\" Shaft 4\" Tube\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eShaft Diameter:\u003c\/b\u003e 2-1\/2\"\u003cbr\u003e\u003cb\u003eStern Tube Diameter (D):\u003c\/b\u003e 4\"\u003cbr\u003e\u003cb\u003eTotal Length (A):\u003c\/b\u003e 9.625\"\u003cbr\u003e\u003cb\u003eTotal Length (compressed) (Compressed A):\u003c\/b\u003e 8.375\"\u003cbr\u003e\u003cb\u003eRotor Diameter (B):\u003c\/b\u003e 4.2\"\u003cbr\u003e\u003cb\u003eCarbon Cuff Diameter (C):\u003c\/b\u003e 3.75\"\u003cbr\u003e\u003cb\u003eStern Cuff Length (E):\u003c\/b\u003e 2\"\u003cbr\u003e\u003cbr\u003e\u003cb\u003eThe PSS Shaft Seal\u003c\/b\u003e is the number one selling marine mechanical seal \u003cbr\u003eworldwide and is installed as standard equipment by many of the worlds most \u003cbr\u003ereputable boat builders \/ yards. The PSS Shaft Seal is also recognized as \u003cbr\u003ethe premiere retrofit (aftermarket) seal on the world market. Certified by \u003cbr\u003eBureau Veritas, ABS \u0026amp; Rina: Boat builders \/ yards recognize the advantages \u003cbr\u003eand value of installing the PSS as it eliminates the maintenance, constant \u003cbr\u003eadjustment \u0026amp; cost associated with traditional packing type glands. Aside \u003cbr\u003efrom these benefits, the PSS Shaft Seal helps to eliminate water in the \u003cbr\u003ebilge (100% water tight) \u0026amp; wear to the propeller shaft. The PSS Shaft Seal \u003cbr\u003ecan be easily retrofitted and is available for shafts ranging from 3\/4\" \u003cbr\u003e(20mm) to 6\" (150mm).\u003cbr\u003e\u003cbr\u003e\u003cb\u003eThe PSS Shaft Seal\u003c\/b\u003e is a mechanical face seal that is created between \u003cbr\u003ethe flat surfaces of the rotating stainless steel rotor and the stationary \u003cbr\u003ecarbon flange. The stationary carbon flange is attached to the vessels stern tube with hose clamps and the carbon flange is attached to the front side of the bellows with hose clamps. The stainless steel rotor is fit on the shaft \u003cbr\u003ein front of the carbon flange. The stainless steel rotor is used to compress the bellows before the collar is secured to the shaft with set-screws. This \u003cbr\u003ecompression (pre-load) maintains contact between the faces and allows the \u003cbr\u003ePSS to compensate for the thrust from the propeller. The carbon flange is \u003cbr\u003ebored larger than the shaft diameter allowing it to \"float\" around the shaft and thus compensate for most misalignment and vibration problems. The \u003cbr\u003estainless steel collar is sealed to the shaft by two o-rings that are \u003cbr\u003erecessed into the bore of the collar. These o-rings rotate with the shaft \u003cbr\u003eand stainless steel rotor and do not experience wear during operation.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e**As with any rubber hose below waterline, the PSS bellows must be inspected on a regular basis for any sign of wear, aging or chemical deterioration. \u003cbr\u003ePYI suggests as preventative maintenance that the PSS bellow be replaced in \u003cbr\u003esix year intervals. During bellows replacement it is recommended the o-rings \u0026amp; set screws in the stainless steel rotor also be replaced.\"\u003cbr\u003e\u003cbr\u003eBellows may need to be more frequently inspected in an environment where \u003cbr\u003enon-sealed batteries emit sulfuric acid. Sulfuric acid vapor will accelerate rubber deterioration, as will an ozonater.\u003cbr\u003e\u003cbr\u003eThe Maintenance Kit includes the items you need to properly maintain your \u003cbr\u003ePSS Shaft Seal. Included in the kit is one (1) PSS bellow, two (2) O-rings, \u003cbr\u003efive (5) set screws, four (4) new hose clamps and an allen key. \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003eThe PSS Shaft Seal Part Number 02-212-400 is a trusted, high-performance solution designed for marine applications requiring a reliable seal around a 2-1\/2 inch diameter shaft within a 4 inch stern tube. Renowned globally as the best-selling marine mechanical seal, the PSS Shaft Seal is widely installed by leading boat builders and yards due to its durability, ease of installation, and maintenance-free operation. Certified by Bureau Veritas, ABS, and Rina, this seal offers a significant upgrade over traditional packing glands by eliminating the need for constant adjustments, reducing maintenance costs, and preventing water intrusion into the bilge, thereby promoting safer and more efficient vessel operation. The PSS Shaft Seal’s innovative design ensures a 100% watertight environment, protecting your boat's integrity and prolonging the lifespan of your propeller shaft.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eDurable mechanical face design: Creates a reliable seal between rotating and stationary components\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003ePre-loaded stainless steel rotor: Maintains constant contact and compensates for thrust and misalignment\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eFloating carbon flange: Accommodates shaft misalignment and reduces vibration impact\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eSealed with O-rings: Ensures smooth rotation without wear, maintaining long-term performance\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eEasy retrofit compatibility: Suitable for shafts from 3\/4 inch to 6 inches in diameter\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eCertified by major marine safety organizations: Ensures compliance and high-quality standards\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eComprehensive maintenance kit included: Facilitates regular inspection and replacement of key components for optimal performance\u003c\/li\u003e\u003c\/ul\u003e\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\n\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eTruck Freight: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eOversized: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"PSS Shaft Seal","offers":[{"title":"Default Title","offer_id":44253597204569,"sku":"50874","price":742.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/50874XL.jpg?v=1785353395"},{"product_id":"pss-shaft-seal-2-inch-diameter-with-2-3-4-inch-tube-for-marine-applications","title":"PSS Shaft Seal 2-Inch Diameter with 2-3\/4-Inch Tube for Marine Applications","description":"\u003cp\u003e\u003cstrong\u003eSilicone Shaft Seal 2\" Shaft  2-3\/4\" Tube\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe PSS PRO Shaft Seal is a mechanical face seal utilizing PSS's proven stainless steel and carbon sealing components, with a few additions. These additions include adding reinforced silicone bellows, 316 stainless steel hose clamps (rolled edges and non-perforated), and an optional Nitronic 50 rotor upgrade (for highly corrosive environments).\u003c\/p\u003e\u003cp\u003eDesigned specifically for applications that will require increased durability and resistance to harsh, corrosive, high-pressure, and otherwise demanding environments, the PSS PRO Shaft Seal is a specialized mechanical seal that is suitable for a variety of applications and has unmatched performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e2 in. shaft diameter\u003c\/li\u003e\n\u003cli\u003e2-3\/4 in. to 2-7\/8 in. stern tube diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCertifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eABS Certified\u003c\/li\u003e\n\u003cli\u003eRINA Certified\u003c\/li\u003e\n\u003cli\u003eBureau Veritas Certified\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eHow Does it Work\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eTwo nitrile o-rings seal the stainless steel rotor to the shaft and will not experience wear.\u003c\/p\u003e\u003cp\u003eThe Shaft Retention Collar is attached to the shaft and helps retain the propeller or rudder shaft in a vessel in the event of catastrophic failure of the coupling or if the shaft comes free from the coupling.\u003c\/p\u003e\u003cp\u003eA seal is created between the two mating faces of the carbon stator and the stainless steel rotor.\u003c\/p\u003e\u003cp\u003eA seal is created between the two mating faces of the carbon stator and the stainless steel rotor.\u003c\/p\u003e\u003cp\u003eRaw water is fed to the PSS Shaft Seal for cooling \/ lubricating the seal faces on high speed vessels.\u003c\/p\u003e\u003cp\u003eHose clamp tail protection, Clamp Jackets.\u003c\/p\u003e\u003cp\u003eThe stationary carbon stator is attached to the bellows, which is secured to the stern tube (shaft log).\u003c\/p\u003e\u003cp\u003e316SS hose clamps with rolled edges and a non-perforated band.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShaft Retention Collar\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe PYI Shaft Retention Collar is designed to help retain the propeller or rudder shaft in a vessel in the event of catastrophic failure of the coupling or if the shaft comes free from the coupling. The double split design provides maximum axial holding power with the benefit of quick and efficient assembly with the shaft installed. The design fully engages the shaft without marring. Easily installed where major disassembly would otherwise be required. Greater axial holding power than set screws or one-piece clamping collars. Effective on hard and soft shafts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eRotor\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe PSS stainless steel rotor is slid down the shaft and secured to the shaft with set screws at 90 for maximum holding power. Precision tolerances are maintained by computer-controlled lathes. The faces have a number 9 micro finish and are perpendicular to the bore to prevent run-out as the collar rotates. The carbon graphite stator will polish the face of the rotor during the first few minutes of operation. The stainless steel rotor should not need to be replaced under normal operating conditions. The stainless steel rotor used on the PSS Type A Shaft Seal is made from 316L stainless steel.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCarbon Stator\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe high-density resin-impregnated carbon\/graphite stator is a composite that is first mixed, molded, and then formed under pressure. The blanks are then baked, machined, and lapped. The face of our carbon is finished to a flatness of 4 helium light bands (measured .000044\" of variation over the entire lapped surface). The grade of carbon used in the PSS has an operating temperature of over 500 Fahrenheit (+260 Celsius) and cannot melt if the seal runs dry, unlike a rubber lip seal or plastic face seal. The high density of the carbon greatly increases its longevity and wear resistance. Several commercial vessels have recorded over 40,000 (over 4-1\/2 years of continuous operation) engine hours on the same, original components. The carbon should not need to be replaced under normal operating conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBellow\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe PSS PRO Shaft Seal bellow provides the best combination of durability, strength, and elasticity. It's constructed of four-ply aramid or silicone with a flurosilicone outer. This flurosilicone cover creates an oil- and fuel-resistant barrier, protecting the exterior surface from the possibility of damage from a splash or spill. Both ends of the bellow are sealed. The four-ply cloth inlay provides excellent strength and resistance to abrasion. This bellow has a continuous operating temperature range of -90F to +425F (-70C to +220C).\u003c\/p\u003e \u003c!--- cis2:m2lsl5xp ---\u003e\n\u003cp\u003eThe PSS PRO Silicone Shaft Seal, part number 03-200-234 by PSS Shaft Seal, is a high-performance mechanical face seal designed specifically for demanding marine environments. Featuring a 2-inch shaft diameter and accommodating stern tube sizes from 2-3\/4 to 2-7\/8 inches, this seal provides exceptional durability and resistance to corrosion, high pressure, and harsh conditions. Its construction utilizes proven stainless steel and carbon sealing components, enhanced with reinforced silicone bellows and premium-grade hose clamps, ensuring reliable operation in critical applications. The optional Nitronic 50 rotor upgrade offers superior corrosion resistance for highly aggressive environments, making this seal suitable for a wide range of vessels requiring robust sealing solutions. Its ABS, RINA, and Bureau Veritas certifications attest to its compliance with rigorous safety and quality standards, ideal for commercial and recreational marine use. The PSS Shaft Seal works by employing two nitrile o-rings that securely seal the stainless steel rotor to the shaft, preventing water ingress and maintaining pressure integrity. The seal faces—comprising a carbon stator and stainless steel rotor—create a reliable, wear-resistant barrier that is self-polishing during operation, which extends the lifespan of the seal. The design also includes a shaft retention collar, which provides added security by helping retain the propeller or rudder shaft in the event of a catastrophic failure or shaft disconnection, ensuring safety and operational continuity. The high-density carbon face is engineered to withstand operating temperatures over 500°F, making it suitable for high-speed vessels, while the silicone bellows offer excellent elasticity and resistance to oil and fuel spills. Constructed with four-ply aramid or silicone, the bellows are designed for longevity, flexibility, and resistance to abrasion, withstanding temperatures from -90°F to +425°F. This comprehensive sealing solution is built for demanding marine applications, combining reliability, ease of installation, and long-term durability, making it an essential component for vessel propulsion systems requiring maintenance-free, high-performance seals. Whether for new installations or replacements, the PSS Shaft Seal ensures optimal performance and peace of mind in challenging environments. Please note that this product complies with PROP 65 regulations, ensuring safety and environmental standards are met.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003e2-inch shaft diameter suitable for a variety of marine applications\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eCompatible with 2-3\/4 inch to 2-7\/8 inch stern tube diameters\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eReinforced silicone bellows for enhanced durability and elasticity\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e316 stainless steel hose clamps with rolled edges and non-perforated band for secure installation\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eOptional Nitronic 50 rotor upgrade for highly corrosive environments\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eCarbon graphite stator with high-temperature resistance and long service life\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eStainless steel rotor made from 316L stainless steel for corrosion resistance\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eDouble split shaft retention collar provides maximum axial holding power\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eDesigned to operate reliably at temperatures up to 500°F\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eABS, RINA, and Bureau Veritas certified for safety and quality standards\u003c\/li\u003e\u003c\/ul\u003e\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\n\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eTruck Freight: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eOversized: No\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"PSS Shaft Seal","offers":[{"title":"Default Title","offer_id":44253597270105,"sku":"99775","price":574.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/files\/99775XL.jpg?v=1785353406"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0623\/1818\/2489\/collections\/50850XL.jpg?v=1785873862","url":"https:\/\/www.marinepartsonly.com\/collections\/shaft-seals.oembed","provider":"Marine Parts Only","version":"1.0","type":"link"}