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  1. bc1080

    37° formed flares, allowable wall thicknesses for tubing

    Hopefully I posted in the best place, pressure systems have not really been my area of focus but I do have a need for reworking one currently. We have an older drawing calling out a 1/4" OD, .035" wall tube that is flared (via SAE AS4330) and connects via sleeve and coupling nut to an AN-type...
  2. bc1080

    Meaning of "fatigue load lbs" values provided in NAS spec (comparing fastener ductility/to

    Hello, We are comparing several NAS bolt options as a replacement for an existing joint on a fairly short schedule and am looking into one we haven't used before. I noticed that on the NAS624-644 bolt spec sheet data table there is a header "fatigue load lbs +/-2%" with "high" and "low" columns...
  3. bc1080

    Reacting high torque in a tight area, box-end wrench max torque

    We have a through-bolt joint where there is very limited access to one side of the interface. We are planning to torque from the open side using either a torque multiplier or a calibrated electronic impact driver. The other side (restricted area) is a 12-pt nut with 1.5" flat-to-flat, and the...
  4. bc1080

    Calling out standard bolts on drawings & bolt certs

    In our work we usually (pretty much always) deal with NAS fasteners and so we are use to having a very specific fastener code to place on drawing EPLs to allow the shop to order the exact fastener we need from any number of industry vendors. We are now designing a piece of tooling and are...
  5. bc1080

    Loose fitting pins in lifting lugs

    We have a lot of old lifting equipment around and are having compatibility issues with trying to design new hardware for them. In particular, many of our bridge cranes have load blocks with pins to attach lifting devices. Frustratingly, these pin sizes vary between the cranes and many of them...
  6. bc1080

    Vendor provided over-strength material, is our old testing valid?

    We purchased a run of specialized stainless forgings and the product the vendor delivered is testing about 30% higher than the yield and ultimate properties we requested in the spec. While the additional strength itself is not problematic, it is causing concern among our team because it's above...

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