Tuthill P133-13H Cap Screw M8 x 25 mm
The Tuthill P133-13H is a genuine cap screw in M8 x 25 mm, for Tuthill pump cover and gear case fastening. Fasteners look like the least interesting part of a pump rebuild until one of them is the wrong length, the wrong grade or the wrong material. That is why Tuthill lists them by part number rather than by description alone.
Cover screws are drawn down gradually in an alternating pattern rather than one at a time, so the cover pulls square onto its gasket. The longer M8 x 65 mm screw in the same family is P133-33H, and mixing the two lengths in one cover is a common and expensive mistake. 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 cap screw
- Size M8 x 25 mm
- Supplied to the factory material specification
- 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: P133-13H
- Part Type: Cap Screw
- Fits: Tuthill pump cover and gear case fastening
- Size: M8 x 25 mm
- 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 cap screw.
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