Flange Bolts
Flange Bolts
(OP)
Can somebody please tell me the advantage (or disadvantage) of using STUD BOLTS over Hexagonal Head Bolts for jointing flanges.
Would you know any website that I can read regarding this matter.
Would you know any website that I can read regarding this matter.





RE: Flange Bolts
Quoting from the NAVCO PIPING DATALOG
"Ordinarily, mild steel bolts are made with upset square heads, although in the larger sizes, such as 1-1/2" and above, it is frequently advantages to use double threaded or all threaded bolts calledstud bolts."
continuing from page 194...
"Bolts of classification ASTM A193 can be secured with forged heads, but for flange bolts it has become almost universal practice to use stud bolts made from bar stock and threaded throughout their length....The continuous threaded structure assures an equal distribution of elongation when the bolts are tightened and avoids concentration of stresses which exists in partially threaded stock due to varying cross sections."
RE: Flange Bolts
http://www.bgmfg.com/stud_bolts.htm
RE: Flange Bolts
http://virtualpipeline.spaces.msn.com
RE: Flange Bolts
A stud bolt and 2 nuts for the majority of the A193 alloys will generally be considerably cheaper than a hex head bolt and nut. This cost of a stud and nust can be from 25% to 50% of the cost of a hex head.
Another factor is that there is can be a lead time for hex head fasteners as studs can cut to order quickly.
RE: Flange Bolts