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  • Users: Chiwahua
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  1. Chiwahua

    Bolt preload vs failure in shear

    We have a case where we have a bolt that fails in shear. Am I wrong to think that: the higher the tension in the bolt, the less it takes to be able to shear the bolt?! For example: Bolt 1 is torqued at 600 lbs.ft Bolt 2 is torqued at 200 lbs.ft Let's pretend the friction due to the clamping...
  2. Chiwahua

    Welding on an hydraulic fluid tank (full or empty?)

    We are required to weld on an hydraulic tank. What would be the safe way to do this (tank full, or tank empty?, etc) If we drain the tank before welding, there would still be a film of oil on the wall, and the flash point of the fluid (~390°F) will likely be easier to reach than if the tank is...
  3. Chiwahua

    Nitriding vs Corrosion resistance

    We have a custom-design bearing race that needs to be surface hardened, but also needs to be corrosion resistant. We believed that nitriding could achieve those two features. The part is made out of 4140. On the draft, it is specified nitriding (but no specific type or process for the...
  4. Chiwahua

    Unknown seal standard

    I'm trying to find the standard of this seal. I thought it might be a BSPP seal but the thickness of the seal doesn't correspond to DIN 3869. Do you have an idea about this seal corresponds to what standard and number (ISO XXXX ? DIN XXXX? SAE XXXX?) Thank you
  5. Chiwahua

    Steel availability vs form

    Hello to all, Well, this is my first post. I'm a mechanical engineer with ~10 years experience. Each time I have a steel selection to do, I have a real hard time finding a "commonly available" type of steel (with a required yield strenght, for example) versus the shape required. For example...

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