Skip to content
FREE SHIPPING ON ALL ORDERS OVER $99
FREE SHIPPING OVER $99
Buy PSS Shaft Seal 02-300-512 3" Shaft - 5-1/2" Stern Tube - Marine

3" Shaft - 5-1/2" Stern Tube

by PSS Shaft Seal
Sold out
$1,747.00 - $1,747.00
$1,747.00
$1,747.00 - $1,747.00
$1,747.00
SKU CW76070

Delivery time

Ships out in 1-2 Business Days

Availability:
Out of stock

3" Shaft - 5-1/2" Stern Tube

The PSS Shaft Seal is the #1 selling marine mechanical seal worldwide and is installed as standard equipment by many of the worlds 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 & 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) & 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 PSS stainless steel rotor is slid down the shaft and is 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. 

Carbon Stator

The 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 entire lapped surface). The grade of carbon used in the PSS has an operating temperature 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 the 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. 

Bellow

The PSS Type A Shaft Seal bellow is made from rubber (Nitrile), and has a temperature rating of -25°F to +225°F (-31°C to +107°C). Nitrile is known for its resistance to weathering. Nitrile rubber is exceptionally resistant to oils and non-polar solvents. It also offers good gas impermeability, abrasion resistance, and better thermal stability than most general purpose elastomers. 

Hose Barb

For high speed vessels it is required that a positive water supply be plumbed to the PSS Shaft Seal for the purpose of lubricating and cooling the seal faces. There are many sources of water supply, review the PSS Shaft Seal Installation Instructions for more information and note all plumbing must follow the standards and practices of proper boat plumbing. In most cases a slow speed boat that does not have a bearing 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 water line and is close to the center line as possible to ensure the vent hose is never below the water line, even if the boat heels. Review the PSS Shaft Seal Installation Instructions for more details on venting the seal.

FAQ

Return Policy

We don't want to see you stuck with a part that is not right for your application, or that you no longer need.  We issue refunds every day to make sure our customers have a positive purchase experience.  All these are issued as refunds, we do not maintain store credits. Returns must be initiated within 30 days of receiving the order.

However, for various policy, safety, and regulatory reasons, a small number of items are non-returnable for credit.  These are normally noted on the product page and visible at the time of purchase.  See our Returns Policy for full details on product returnability.

For orders where the item has been received is incorrect, defective or has been damaged in transit, we will pay return shipping and either replace the item or refund the amount paid, at the customer's discretion.

If the reason for the return is different, the customer is responsible for inbound and outbound shipping costs.  Shipping costs paid on the original order are non-refundable.  For orders shipped free on our $99 Free Shipping offer, an amount may be deducted from your refund to cover outbound shipping costs if returned.

Special Orders are normally non-cancellable and non-returnable because a lot of additional work must be performed to obtain a special order part that is not ordered very often.  If we are able to facilitate a special order return, you may have up to a 30% restocking fee deducted from your refund to cover manufacturer restocking fees and other associated costs.

Refunds can only be returned to the same method of payment that was originally used to pay for the order.

Shipping Policy

Free Shipping Offer

Orders qualify for our Free Shipping Offer only if the total value of items on a single order exceeds $99.00 before taxes. Multiple orders to the same address must each exceed the $99.00 threshold to qualify for free shipping. All free shipping items include shipment ONLY via an economy Ground Service of our choosing, with a delivery standard of 1 to 9 days. You may have the option of a paid upgrade to a higher level of service if delivery is required in a shorter time frame.  

 

Tailgate Charges levied by carriers for delivery of LTL Transport shipments to residences or other locations without a dock or forklift truck are not included in the free shipping service and are the responsibility of the customer.

 

 

Orders shipping outside the 48 contiguous US states or 10 Canadian provinces do not qualify for the Free Shipping Offer.

 

 

Items shipped free of charge and subsequently returned will be subject to a restocking charge equivalent to the costs of outbound shipping, except in cases where we have made a material error in fulfilling your order.  In this case, customers are also responsible for return shipping costs.

 

 

 

General Shipping Standards

Current shipping lead times are detailed on each product page and are based on the location of stocked items.  In the vast majority of cases, we are able to ship in-stock products the next business day for orders placed before 4 pm Eastern time Monday through Thursday and before noon on Sunday for Monday delivery. Any items displaying shipping lead times greater than 1-2 Business Days will ship in the time frame indicated.

 

Note that in multi-product purchases, shipping costs are calculated based on the combined shipment weight of all items.  If individual items within an order have varying lead times, the order will not ship until all items are available for shipment.

 

Special Order Items average a shipping lead time of about three weeks.  

 

Back Orders

If there is an error in our data and we identify that one or more products on your order are back-ordered, you will be advised of the estimated shipping date for those products and you may cancel those items without penalty prior to shipping.

 

 

Special Order Products

Special Order products are defined as items that are not normally stocked by us and must be obtained direct from the manufacturer.  Please confirm that the shipping lead time for any special order products (generally about three weeks) meets your scheduling needs (if any) as Special Order Product orders cannot be cancelled after they have been placed with the manufacturer.  (see Returns Policy/“Special Order Products” below.)

 

 

Credit Card Charging Policy

Our policy is to charge the amount of your purchase with your credit card issuer at the time of order so it can be released to our internal systems for processing. This may be a day or two in advance of shipping the product. In the case of special orders, prepayment is required regardless of our lead time to ship (Returns Policy/Special Order Products below.)

 

 

USA Shipments

Orders from US customers are shipped from one of nine warehouses nationwide, picked from one of the largest parts inventories in the country.  For courier shipments, we use UPS exclusively and LTL Freight services are used for items exceeding UPS size/weight limits.  Since all shipments to US customers are domestic, no brokerage, customs or duties apply.  US customers are responsible for any applicable sales and use taxes.

 

Canadian Shipments

Orders for Canadian destinations cannot be processed on rvpartshop.com, Canadian customers can shop at www.rvpartshop.ca for $CAD pricing and shipping availability.

Partnered RV Services