SKU: 16501603821

PSS Shaft Seal 45mm Shaft 3-1/4" Tube

Sale price$241.20 Regular price$268.00
Save 10%

Pay in installments of $67.00 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Aug 26 - Aug 31

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

PSS Shaft Seal 45mm Shaft 3-1/4" TubeShaft Seal 45mm Shaft & 3 1 4" Tube This Type A PSS Shaft Seal is a mechanical face seal. The sealing surface is created between the flat surfaces of the rotating stainless steel rotor and the stationary carbon flange. The PSS Shaft Seal is the #1 selling marine mechanical seal worldwide and is installed as standard equipment by many of the world's most reputable boat builders and boat yards. The PSS Shaft Seal is also recognized as the premiere

Shaft Seal 45mm Shaft & 3-1/4" Tube

This Type A PSS Shaft Seal is a mechanical face seal. The sealing surface is created between the flat surfaces of the rotating stainless-steel rotor and the stationary carbon flange. 

The PSS Shaft Seal is the #1 selling marine mechanical seal worldwide and is installed as standard equipment by many of the world's most reputable boat builders and boat yards. The PSS Shaft Seal is also recognized as the premiere retrofit (aftermarket) seal on the world market. Boat builders and boat yards recognize the advantages and value of installing the PSS, as it eliminates the maintenance, constant adjustment, and cost associated with traditional packing-type glands. Aside from these benefits, the PSS Shaft Seal helps to eliminate water in the bilge (100% watertight) and wear to the propeller shaft. 

How Does it Work?

  1. Two nitrile o-rings seal the stainless steel rotor to the shaft and will not experience wear.
  2. A primary set screw and a backup set screw (2 sets) are used to secure the stainless steel rotor to the shaft.
  3. A seal is created between the two flat surfaces of the carbon stator and the stainless steel rotor.
  4. Water is fed into the PSS Shaft Seal for cooling/lubricating the seal faces on high-speed vessels.
  5. The stationary carbon stator is attached to the nitrile bellow, which is attached to the stern tube (shaft log).

Rotor 

The rotor is made out of 316L stainless steel and machined to a 9-12Ra finish on precision CNC lathes. It is secured on the shaft using 2 pairs of set screws positioned at a 90-degree angle for maximum holding power. The stainless steel rotor further polishes the carbon stator during the initial hours of operations.

Carbon Stator

The high-density, resin-impregnated carbon stator is manufactured from an advanced composite that is first mixed and molded and then formed under pressure. The blank parts are then baked, machined, and lapped to a measured flatness of 4 helium light bands (measured at 0.000044" of variation over its entire lapped surface). The grade of carbon composite used in the PSS Shaft Seal has a maximum operating temperature of 500°F (+260°C) and cannot melt if the seal runs dry for a short period of time, unlike a lip seal or a plastic face seal. In addition, the high density of the carbon greatly increases longevity and wear resistance. As a result, several commercial vessels have recorded over 40,000 engine hours (over 4 1/2 years of continuous operation) on the same original components.

Bellows

The bellows on the Type A seal are molded out of a Nitrile compound. Nitrile is known for its good resistance to petroleum products. In addition, it provides the best combination of durability, strength, and elasticity necessary for this application.

Hose Barb

For high-speed vessels (12+ knots), a positive water supply is required to be plumbed to the PSS Shaft Seal for lubricating and cooling the seal faces. Please review the PSS Shaft Seal Installation Instructions for more information on pickup points for water supply. In most cases, a slow-speed boat (less than 12 knots) that does not have a bearing on the shaft log does not require positive water feed and can simply be vented. Ideally, the vent line will be run at least 2-3 feet above the waterline and as close to the centerline as possible. This will ensure the vent hose is never below the water line, even with significant healing. PSS Shaft Seal Installation Instructions have more details on venting the seal.

Specifications:

  • Temperature Limits: 5°F to 225°F (-15°C to 107°C)
  • Pressure Limits: 15 PSI (1 BAR)
  • Shaft RPM Limits: 10,000 RPM
  • Carbon Graphite: Lapped to 4 HLB (0.000044" tolerance)
  • 316SS / Nitronic 50: Faced to 9-12 Ra
  • Bellows Material: Molded Nitrile - PVC
  • Shaft Diameter: 45mm
  • Stern Tube Diameter (inch): 3-1/4" to 3-3/8"
  • Approximate Length: 9.2175 in.
  • Approximate Compression: 1 in. 
  • Rotor Diameter: 3.75 in. 
  • Stern Cuff Length: 2 in.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 16501603821

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.2 ★★★★★
Based on 12 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
J
Verified Purchase
Joseph Mowery
Birmingham, US
★★★★★ 3
Below expectation
Color: Black
Not quite what I was expecting but it can be used
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
C
Verified Purchase
Christopher Atchison
Waukegan, US
★★★★★ 4
Good
Color: Grey
Works as it should, but one of the brackets on the leg broke while setting up. Super glue is holding it in just fine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 5, 2026
K
Verified Purchase
Kati M
West Palm Beach, US
★★★★★ 1
Not good for putting away daily
Color: Grey
This product may work of you are doing a full install, but is terrible for putting up and taking down daily. I have only had it 2 months and it is falling apart and will not stand straight.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 25, 2026
B
Verified Purchase
Bethany Lindsay
West Palm Beach, US
★★★★★ 5
Privacy at ease!
Color: Black, Color: Black
This is exactly what we needed for our large house and bedroom sharing with the kids. People need privacy and this can be tucked away when it isn't being used. Perfect!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
J
Verified Purchase
J.G.
Bozeman, US
★★★★★ 5
Easy to put together
Color: Black, Color: Black
I was pleasantly surprised by how well this room divider is designed. The engineering behind it is actually pretty thoughtful. All the pieces line up exactly where you expect them to, and the connectors make assembly almost foolproof. I had it put together in just a few minutes without any frustration or extra tools. The fabric panels look clean and modern, and the whole unit is surprisingly lightweight. That makes it easy to move around if you want to reconfigure a room or create a quick private space. Even though it’s light, it still feels stable once it’s assembled. Overall it’s a simple product done right: easy to assemble, easy to move, and it does exactly what it’s supposed to do. I’d definitely buy it again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 9, 2026

recommand products