Where does the
rod end work?
A joint above the waterline and one below it face very different corrosion and service conditions, even on the same boat.
Steering & rudder linkage
A 17-4PH joint holds close to zero play, so every wheel movement reaches the rudder.
Platform & gangway actuators
Grease washes out in splash zones within days. A dry PTFE-lined joint ends the regrease cycle.
Rigging & sail control
Joints at vang, backstay, and boom points give multi-axis movement without the friction of shackles.
Throttle & shift linkages
Close-to-zero-play joints in the engine room hold adjustment through heat and humidity, so engine response stays exact.
Choose the contact
system first.
Do not select a joint from the word “stainless” alone. The race or liner changes maintenance and wear behavior.
PTFE-lined (splash zones)
Ends the regrease cycle in areas where grease washes out within days, like swim platforms and gangways. Confirm the liner suits your actual splash exposure.
Example: JMX / JFX familyGreasable (serviced on a schedule)
Appropriate only where the crew can service the joint on a regular schedule — confirm both the construction and who’s responsible for regreasing before specifying it this way.
Confirm service access and schedule316L standard, above or below the waterline
316L handles salt spray above the waterline as standard. Submersion or stagnant seawater is a different exposure and asks for a separate material review.
Grade follows waterline positionSalt spray, submersion, and dissimilar metals each call for a different check before specifying the joint.
Corrosion, contamination, misalignment, and load each need their own check.
| Condition | What to review before specifying |
|---|---|
| Daily salt spray above the waterline | 316L is the standard housing grade for salt spray exposure. Confirm the joint’s finish and liner are also rated for the same exposure, not just the housing material. |
| Submersion or stagnant seawater | Don’t treat an above-waterline recommendation as approval for submerged service. Confirm the grade, seal, and expected service life separately for anything below the waterline. |
| Grease washing out in splash zones | Grease at swim platform and gangway pivots can wash out within days in a splash zone — a dry PTFE liner avoids the regrease cycle entirely at these locations. |
| Galvanic contact on aluminum brackets | A stainless joint mounted directly into an aluminum bracket can set up a galvanic pair in a wet electrolyte. Use Delrin or PTFE isolation washers to break the pair and reduce pitting risk. |
| Heat and humidity in the engine room | Throttle and shift linkage joints need to hold their adjustment through engine-room heat and humidity — confirm the joint’s rated temperature range against your actual engine compartment conditions. |
Tell us where
the joint lives.
The most useful enquiry contains the real geometry and environment around the joint, not only a nominal bore size.
- ApplicationSteering or rudder linkage, swim platform or gangway actuator, rigging or sail control, throttle or shift linkage, or other
- MotionOscillation angle, cycle frequency, speed, and stop-to-stop travel
- LoadPeak radial load, axial component, vibration, and shock
- EnvironmentHeat, dust, washdown chemistry, salt spray, or submersion exposure
- InterfaceBore, pin diameter, body width, bracket width, spacer, and mounting height
- ThreadMale or female, metric or inch, right- or left-hand, engagement length
- MaterialHousing, ball, race/liner, fastener, and adjacent bracket materials
- DocumentsDrawing, sample, original part number, quantity, and required finish
Above the waterline and below are two different jobs.
The same yacht can need a splash-rated joint at one pivot and a fully reviewed submerged-service joint a few feet away. Specify by waterline position, not by boat.
Before you
place the order.
Use these questions to turn an application description into an engineering review.
Does the same grade work above and below the waterline?
Not necessarily. 316L is the standard for above-waterline salt spray, but submersion or stagnant seawater is a different exposure that needs its own material review — tell us where the joint sits and we’ll confirm.
Is a greasable joint a good choice for a swim platform?
Generally no, unless the crew can service it on a defined schedule — grease tends to wash out in splash zones within days. A dry PTFE-lined joint is the more common choice there.
How do I avoid galvanic corrosion on an aluminum bracket?
Isolate the stainless joint from the aluminum bracket with a Delrin or PTFE washer to break the galvanic pair. This matters most in a wet, salty environment where the pair can form easily.
What should I send for a yacht maintenance joint?
Tell us where the joint sits — above the waterline or below — plus the actuator or linkage geometry. We’ll confirm the grade and finish to match.