Tuthill P203-4-S Stainless Steel Hex Nut for Pump Service
The Tuthill P203-4-S is a genuine hex nut, made in stainless steel, for Tuthill pump gland and bracket studs. A pump joint is a designed clamped connection, and the fastener is part of that design rather than an afterthought. That is why Tuthill lists them by part number rather than by description alone.
The S suffix marks the stainless version, which is what a stainless pump build calls for so the fastener matches the casing and does not set up a galvanic couple. Stainless nuts gall easily when run down dry, so an anti seize compound on the stud threads is worth the minute it takes. Check the threads in the casting before anything is run down. A galled or stretched thread in a soft casting is a much larger repair than a new fastener.
Key Features
- Genuine Tuthill hex nut
- Factory specification thread and length
- Stainless steel construction for corrosion resistance
- Part of the published Tuthill fastener range
- Replaces a damaged, corroded or over stressed original
- Low cost item worth adding to a rebuild kit
Applications
- Lubrication circuits on compressors, gearboxes and engines
- Burner oil and fuel oil transfer and circulation
- Low pressure hydraulic supply circuits
- Heat transfer oil and quench oil service
- Scheduled overhaul of Tuthill rotary gear pumps
- Spares holding for equipment that cannot afford downtime
Specifications
- Brand: Tuthill
- Manufacturer Part Number: P203-4-S
- Part Type: Hex Nut
- Fits: Tuthill pump gland and bracket studs
- Material: Stainless steel
- Condition: New
Frequently Asked Questions
Q: How tight should it go?
Even and gradual, working in an alternating pattern across the joint. Check your service instructions for a torque figure before guessing.
Q: Do stainless threads need anything on them?
An anti seize compound is worth using. Stainless against stainless galls readily, and a galled fastener usually has to be cut off.
Q: How many does a pump take?
That depends on the model and the joint. Count them off as the pump comes apart and keep the lengths separated.
Q: Can I reuse the originals?
If the threads are clean and the head is undamaged, usually yes. Anything stretched, corroded or rounded should be replaced.
Not sure this is the right part? Send us a Picture of the Pump Plate on your pump and the CLR Marine team will confirm the correct nut.
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