PSS Type A Shaft Seal

PSS Type B Shaft Seal

For 4" to 6" (100mm to 150mm) shaft diameters

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Product Specifications: PSS Type B Seal Dimensions

Downloads: Installation Instructions

The PSS Shaft Seal 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.

Components

PSS Type B Shaft Seal rotor

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 B Shaft Seal are made from Nitronic 50 stainless steel.


Carbon Stator

Carbon-graphite is a versatile seal face material used with mating rings of harder material. The PSS carbon has superior wear characteristics and broad chemical resistance.

The face of the carbon is finished to a flatness of 4 helium light bands (measured .000044" of variation over entire lapped surface). The high grade of carbon used in the PSS has an operating temperature over 500°F (+260°C), and cannot melt if the seal runs dry, unlike a rubber lip seal or plastic face seal.

The high density of the carbon increases the longevity and wear resistance. Over 40,000 hours (over 4.5 years of continuous operation) has been recorded on the same original component. The carbon graphite stator should not need to be replaced under normal operating conditions.

PSS Type B Shaft Seal carbon stator

PSS Type B Shaft Seal bellow

Bellow

The PSS Bellows offer the best combination of durability, strength & elasticity, and in addition to carrying standard sizing, can be engineered in a number of configurations to meet various application requirements. The most common configuration is composed of two ends (connectors) and a convolution region where the ends provide the assembly interface and the convolution (bellows) region provides for the design application travel / required flexibility.

The silicone bellow material meets and exceeds the properties listed in SAE J20 Class A and provides superior low and high temperature resistance. The Fluorosilicone Cover creates an oil and fuel resistant barrier protecting the exterior surface from the possibility of damage from splash or spill.


Bellow Rings

The PSS Type B Shaft Seal uses metal rings around the bellow for added strength due to the high pressures that the seal may encounter.

Metal rings on a PSS Type B Bellow

Reinforced bellow on the PSS Type B Shaft Seal

Added Strength

The bellow is reinforced with multiple plies of aramid fabric.


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.

PSS Type A Shaft Seal hose barb

How Does It Work?

How a PSS Type A Shaft Seal Works

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).


Dimensions

PSS Type B Seal dimensions
Part # Shaft Dia. (A) Stern Tube Dia. (B) Approx. Length (C) Approx. Compression Rotor Diameter (D) Stern Cuff Length (E)
02-400-512 4" 5-1/2" to 5-5/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-400-534 4" 5-3/4" to 5-7/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-400-600 4" 6" to 6-1/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-400-614 4" 6-1/4" to 6-3/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-400-612 4" 6-1/2" to 6-5/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-400-634 4" 6-3/4" to 6-7/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-400-700 4" 7" to 7-1/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-414-512 4-1/4" 5-1/2" to 5-5/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-414-534 4-1/4" 5-3/4" to 5-7/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-414-600 4-1/4" 6" to 6-1/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-414-614 4-1/4" 6-1/4" to 6-3/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-414-612 4-1/4" 6-1/2" to 6-5/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-414-634 4-1/4" 6-3/4" to 6-7/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-414-700 4-1/4" 7" to 7-1/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-412-512 4-1/2" 5-1/2" to 5-5/8" 13.189" 1" to 1-1/4" 7.875" 2.5"
02-412-534 4-1/2" 5-3/4" to 5-7/8" 13.189" 1" to 1-1/4" 7.875" 2.5"
02-412-600 4-1/2" 6" to 6-1/8" 13.189" 1" to 1-1/4" 7.875" 2.5"
02-412-614 4-1/2" 6-1/4" to 6-3/8" 13.189" 1" to 1-1/4" 7.875" 2.5"
02-412-612 4-1/2" 6-1/2" to 6-5/8" 13.189" 1" to 1-1/4" 7.875" 2.5"
02-412-634 4-1/2" 6-3/4" to 6-7/8" 13.189" 1" to 1-1/4" 7.875" 2.5"
02-412-700 4-1/2" 7" to 7-1/8" 13.189" 1" to 1-1/4" 7.875" 2.5"
02-434-612 4-3/4" 6-1/2" to 6-5/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-434-634 4-3/4" 6-3/4" to 6-7/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-434-700 4-3/4" 7" to 7-1/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-434-714 4-3/4" 7-1/4" to 7-3/8" 13.671" 1" to 1-1/4" 7.875" 2.5"
02-434-712 4-3/4" 7-1/2" to 7-5/8" 13.671" 1" to 1-1/4" 7.875" 2.5"
02-434-734 4-3/4" 7-3/4" to 7-7/8" 13.671" 1" to 1-1/4" 7.875" 2.5"
02-434-800 4-3/4" 8" to 8-1/8" 13.671" 1" to 1-1/4" 7.875" 2.5"
02-434-858 4-3/4" 8-5/8" to 8-3/4" 13.671" 1" to 1-1/4" 7.875" 2.5"
02-500-600 5" 6" to 6-1/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-500-612 5" 6-1/2" to 6-5/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-500-634 5" 6-3/4" to 6-7/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-500-700 5" 7" to 7-1/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-500-714 5" 7-1/4" to 7-3/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-500-712 5" 7-1/2" to 7-5/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-500-734 5" 7-3/4" to 7-7/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-500-800 5" 8" to 8-1/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-500-858 5" 8-5/8" to 8-3/4" 13.671" 1" to 1-1/4" 7.875" 2.5"
02-512-612 5-1/2" 6-1/2" to 6-5/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-512-634 5-1/2" 6-3/4" to 6-7/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-512-700 5-1/2" 7" to 7-1/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-512-714 5-1/2" 7-1/4" to 7-3/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-512-712 5-1/2" 7-1/2" to 7-5/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-512-734 5-1/2" 7-3/4" to 7-7/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-512-800 5-1/2" 8" to 8-1/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-512-858 5-1/2" 8-5/8" to 8-3/4" 13.671" 1" to 1-1/4" 7.875" 2.5"
02-600-612 6" 6-1/2" to 6-5/8" 14.2415" 1" to 1-1/4" 8.875" 2.5"
02-600-634 6" 6-3/4" to 6-7/8" 14.2415" 1" to 1-1/4" 8.875" 2.5"
02-600-700 6" 7" to 7-1/8" 14.2415" 1" to 1-1/4" 8.875" 2.5"
02-600-714 6" 7-1/4" to 7-3/8" 13.9195" 1" to 1-1/4" 8.875" 2.5"
02-600-712 6" 7-1/2" to 7-5/8" 13.9195" 1" to 1-1/4" 8.875" 2.5"
02-600-734 6" 7-3/4" to 7-7/8" 13.9195" 1" to 1-1/4" 8.875" 2.5"
02-600-800 6" 8" to 8-1/8" 13.9195" 1" to 1-1/4" 8.875" 2.5"
02-600-858 6" 8-5/8" to 8-3/4" 14.2415" 1" to 1-1/4" 8.875" 2.5"
Part # Shaft Dia. (A) Stern Tube Dia. (B) Approx. Length (C) Approx. Compression Rotor Diameter (D) Stern Cuff Length (E)
02-100M-512 100mm 5-1/2" to 5-5/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-100M-534 100mm 5-3/4" to 5-7/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-100M-600 100mm 6" to 6-1/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-100M-614 100mm 6-1/4" to 6-3/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-100M-612 100mm 6-1/2" to 6-5/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-100M-634 100mm 6-3/4" to 6-7/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-100M-700 100mm 7" to 7-1/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-110M-512 110mm 5-1/2" to 5-5/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-110M-534 110mm 5-3/4" to 5-7/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-110M-600 110mm 6" to 6-1/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-110M-614 110mm 6-1/4" to 6-3/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-110M-612 110mm 6-1/2" to 6-5/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-110M-634 110mm 6-3/4" to 6-7/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-110M-700 110mm 7" to 7-1/8" 13.189" 1" to 1-1/4" 7" 2.5"
02-115M-512 115mm 5-1/2" to 5-5/8" 13.314" 1" to 1-1/4" 7.875" 2.5"
02-115M-534 115mm 5-3/4" to 5-7/8" 13.314" 1" to 1-1/4" 7.875" 2.5"
02-115M-600 115mm 6" to 6-1/8" 13.314" 1" to 1-1/4" 7.875" 2.5"
02-115M-614 115mm 6-1/4" to 6-3/8" 13.314" 1" to 1-1/4" 7.875" 2.5"
02-115M-612 115mm 6-1/2" to 6-5/8" 13.314" 1" to 1-1/4" 7.875" 2.5"
02-115M-634 115mm 6-3/4" to 6-7/8" 13.314" 1" to 1-1/4" 7.875" 2.5"
02-115M-700 115mm 7" to 7-2/8" 13.314" 1" to 1-1/4" 7.875" 2.5"
02-120M-612 120mm 6-1/2" to 6-5/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-120M-634 120mm 6-3/4" to 6-7/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-120M-700 120mm 7" to 7-1/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-120M-714 120mm 7-1/4" to 7-3/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-120M-712 120mm 7-1/2" to 7-5/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-120M-734 120mm 7-3/4" to 7-7/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-120M-800 120mm 8" to 8-1/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-120M-858 120mm 8-5/8" to 8-3/4" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-130M-612 130mm 6-1/2" to 6-5/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-130M-634 130mm 6-3/4" to 6-7/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-130M-700 130mm 7" to 7-1/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-130M-714 130mm 7-1/4" to 7-3/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-130M-712 130mm 7-1/2" to 7-5/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-130M-734 130mm 7-3/4" to 7-7/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-130M-800 130mm 8" to 8-1/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-130M-858 130mm 8-5/8" to 8-3/4" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-140M-612 140mm 6-1/2" to 6-5/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-140M-634 140mm 6-3/4" to 6-7/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-140M-700 140mm 7" to 7-1/8" 13.742" 1" to 1-1/4" 7.875" 2.5"
02-140M-714 140mm 7-1/4" to 7-3/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-140M-712 140mm 7-1/2" to 7-5/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-140M-734 140mm 7-3/4" to 7-7/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-140M-800 140mm 8" to 8-1/8" 13.42" 1" to 1-1/4" 7.875" 2.5"
02-140M-858 140mm 8-5/8" to 8-3/4" 13.671" 1" to 1-1/4" 7.875" 2.5"
02-150M-612 150mm 6-1/2" to 6-5/8" 14.2415" 1" to 1-1/4" 8.875" 2.5"
02-150M-634 150mm 6-3/4" to 6-7/8" 14.2415" 1" to 1-1/4" 8.875" 2.5"
02-150M-700 150mm 7" to 7-1/8" 14.2415" 1" to 1-1/4" 8.875" 2.5"
02-150M-714 150mm 7-1/4" to 7-3/8" 13.9195" 1" to 1-1/4" 8.875" 2.5"
02-150M-712 150mm 7-1/2" to 7-5/8" 13.9195" 1" to 1-1/4" 8.875" 2.5"
02-150M-734 150mm 7-3/4" to 7-7/8" 13.9195" 1" to 1-1/4" 8.875" 2.5"
02-150M-800 150mm 8" to 8-1/8" 13.9195" 1" to 1-1/4" 8.875" 2.5"
02-150M-858 150mm 8-5/8" to 8-3/4" 14.2415" 1" to 1-1/4" 8.875" 2.5"

Tips

Here are some helpful tips to make sure you get the most out of your PSS Shaft Seal.
For more helpful tips please visit our FAQ page.

PSS Maintenance Kit

Typically the carbon and stainless steel sealing components will not need replaced where we see many commercial vessels recording over 40,000 engine hours on original components. That said, we do recommend the rubber bellow component be replaced in 6 year intervals as precautionary maintenance kit for this replacement which includes the rubber bellow and all necessary hardware.

More Info
PSS Maintenance Kit For Type A Seals
New and used set screws

Set Screws

Please be sure to never use the same set screw on the shaft twice. There are two set screws in each of the two holes in the stainless steel rotor. One is tightened onto the shaft and the other is tightened onto the first to lock it in place against the shaft. The set screws are made with a cup at the base that compresses into the shaft ensuring a secure grip. When re-installing the rotor please use new set screws. In the case that you do not have spare set screws, the set screws in the rotor need to be reversed so there is an unused cup being compressed onto the shaft.

If you need to new set screws you can purchase a PSS O-Ring Kit. This comes with 2 new o-rings, 5 set screws, an allen wrench, Clamp Jackets and Thread Lock.

More Info