Standard ASTM Bolt Seating Loss
Standard ASTM Bolt Seating Loss
(OP)
It seems a lot of hydraulic bolt tensioning companies refer to an industry standard of "% of Load In bolt after seating losses"= 1.01+D/L where D is the nominal diameter of the fastener, and L is the grip length of the fastener, with a minimum of 90% seated load (or 10% loss).
Does anyone know if this comes from a specific ASTM standard?
It looks like this is an empirical formula so I'd like to know what data (bolt sizes, threads, etc.) were used in the data. Thanks
Does anyone know if this comes from a specific ASTM standard?
It looks like this is an empirical formula so I'd like to know what data (bolt sizes, threads, etc.) were used in the data. Thanks





RE: Standard ASTM Bolt Seating Loss
RE: Standard ASTM Bolt Seating Loss
Several years after this I was talking to the Superbolt people and they mention that the developer of the MJB nut had encountered what he called "The Virgin Bolt Phenomena" it was essentially the same a Mr. Biach had found previously. Superbolt did have a paper on their site with all the details. I'm try to find my copy.. You might call Superbolt to see if they still have the paper available .
We have experienced this in some batches of H-11 bolts ¾”, we use. It appears that once the bolt cycles the relaxation is all over and done with. One just has to know it happens and look out for it and correct it.
RE: Standard ASTM Bolt Seating Loss
RE: Standard ASTM Bolt Seating Loss
RE: Standard ASTM Bolt Seating Loss
http://www.boltscience.com/pages/references.htm