PSS Shaft Seal 2-1/2" Shaft x 3-1/2" Stern Tube | 02-212-312
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PSS Dripless Shaft Seal — 2-1/2" Shaft × 3-1/2" Stern Tube
The PSS 02-212-312 is a mechanical face-type dripless shaft seal for inboard vessels running a 2-1/2" propeller shaft and a 3-1/2" to 3-5/8" stern tube. A stationary carbon flange presses against a rotating stainless-steel rotor to form a positive seal — no drip, no packing adjustment, no shaft wear from a conventional stuffing box.
Key Specifications
- Shaft diameter: 2-1/2"
- Stern tube (shaft log) OD: 3-1/2" to 3-5/8"
- Seal type: PSS Type A mechanical face seal
- Sealing flange: carbon
- Rotor: stainless steel
- Compression maintained by bellows
- Overall length: approx. 9.625"
- Part number: 02-212-312 / 02212312
Compatible Applications
- Inboard marine propulsion systems with a 2-1/2" propeller shaft
- Stern tubes measuring 3-1/2" to 3-5/8" OD at the bellows connection point
- Both shaft diameter and stern-tube diameter must be confirmed before ordering — do not select by shaft size alone
When to Replace
- Bellows shows aging, cracking, or deterioration (below-waterline component — inspect regularly)
- Sealing faces are damaged or no longer seat correctly
- Leakage develops at the seal interface
- Hose connections, clamps, or rotor set screws show corrosion or looseness
Installation Notes
- Clean and inspect carbon and stainless sealing faces before assembly
- Set bellows compression per PSS specifications for this shaft size
- Position rotor accurately on the shaft and torque hardware to manufacturer spec
- Verify available shaft space against the 9.625" installed length
Alternate & Cross-Reference Part Numbers
- 02-212-312
- 02212312
- 2212312
- Distributor ref: 730-02212312
Other PSS Shaft Seal Sizes
- PSS 02078112 — 7/8" Shaft
- PSS 02100112 — 1" Shaft
- PSS 02114214 — 1-1/4" Shaft
- PSS 02138214 — 1-3/8" Shaft
Parts Desk Insights
The most common ordering mistake with PSS seals is matching only the propeller shaft diameter. For the 02-212-312, the second critical measurement is the stern tube OD — this version fits a 3-1/2" to 3-5/8" tube. Measure both before ordering to avoid a difficult installation mismatch. If you're replacing an existing stuffing box, also confirm you have enough shaft space for the 9.625" installed length before the coupler or cutlass bearing.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.