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  1. horstr1

    O-ring hardness for SAE ports

    Compositepro, I'm sure you're absolutely right, and I'm not trying to badmouth NPT connections in general. There must be billions of them performing admirably right now, and lasting for decades. But I can't bet this farm on them being "put together correctly by knowledgeable people." Even if...
  2. horstr1

    O-ring hardness for SAE ports

    Thanks for your candor, Oldhydroman. Please don't water down any 'tirades' in the future. Worst case in my case would be another Macondo-type situation, so there's no room for compromise or a fragile ego. I'm not trying to reinvent any wheels here, I just want to be sure I have an adequate...
  3. horstr1

    O-ring hardness for SAE ports

    Thanks for both helpful answers. Since I already decided to buy the O-rings separate and scrap whatever comes on the plugs, I'll specify 90 durometer. I agree with hydtools that extrusion is moot, but it doesn't seem like a harder O-ring would hurt anything. And it might help add some safety...
  4. horstr1

    O-ring hardness for SAE ports

    OK, this isn't a pump question, but there isn't a general hydraulics category, and I see someone else's O-ring question was addressed nicely. I"m replacing a bunch of #&%! NPT plugs with SAE J1926 ones in a hydraulic system. They're just closing off crossover holes in blocks of steel. I don't...
  5. horstr1

    High contact load on silver plated bearing

    Thanks for responding, Cockroach. Those are indeed some interesting experiences. Did you find out whose screwdriver it was and kick their butt for a while? My application is a flat surface against a flat surface. Basically a large thrust washer. The bearing itself will be Stellite, or...
  6. horstr1

    High contact load on silver plated bearing

    Has anyone done high-load bearings with silver plating? I hear and read things with words like 'high load' in them, but nothing quantitative. Obviously the material strength of silver is way less than structural metals. But in a thin film on a wide surface, do numbers like yield strength mean...
  7. horstr1

    bolt/joint stiffness ratio & preload

    I found a good discussion at thread725-79154 that's close to answering my question, but not quite a conclusive answer. I am working on a bolted joint where the joint is only about 4 times stiffer than the bolt. (The 'active' length of the bolt is about 4 diameters, but about half of that is...
  8. horstr1

    Socket head cap screw strength

    Thanks to all for the thoughtful inputs. As engineers, we always have constraints, and they usually preclude doing what we would ideally choose. If I had my druthers, I'd use more bolts or bigger ones or both. But I've got space constraints, and I've got the available space packed full of the...
  9. horstr1

    Socket head cap screw strength

    dinjin, it'll probably be an air impact most of the time. Why do you ask? MintJulep, that's a good point. It'd be on the news if this thing failed. But half of the bolts are the shoulder screws I designed, for which there are no Brand X substitutes. Having them designed with some safety...
  10. horstr1

    Socket head cap screw strength

    Thanks for the references, TVP, that's exactly what I needed. The BOM (which I recently inherited) called the screw out as a grade 8, which was throwing me off. I'll make sure to specify ASTM A574 so I'll know what I'm getting. What was bothering me was that, although the ultimate strength...
  11. horstr1

    Socket head cap screw strength

    I have an application in development that uses 1.375-12 socket head cap screws. The calculated maximum load for the beast puts a stress of about 119 ksi on each one of these. (The estimated load may be high, I plan to strain gauge the beast and find out what the real load is.) Since nominal...

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