A tapped hole is just a hole with screw threads.
A cap screw does fit in a tapped hole but so will a hex head bolt or a stud (ie a studbolt with only one nut).
[QUOTE=pitch;19215]A tapped hole is just a hole with screw threads.
A cap screw does fit in a tapped hole but so will a hex head bolt or a stud (ie a studbolt with only one nut).
But what is the tapped hole doing as a bolt item?
What is it used for? Is it just for having a possibility to have different types bolts, same as for CAP or?
MACH and STUD is for same purpose but with different typ, is it the same with CAP and TAP?
Jackscrews:
Where you have an item such as a spectacle plate between flange there is often a need to periodically remove and reverse the plate. In order to remove the plate the flanges need to be separated. In larger pipes there is little "spring" in the pipe so extra holes are drilled & tapped into one of the flanges and screws are inserted. When the plate requires removal the screws are turned to force the flanges apart, thus easing the plate removal.
Mach and stud are not the same thing.
MACH is a machine bolt which has a Head usually hexagonal and can be supplied with or without a single nut
A stud has no head and can be supplied with or without a single nut
Studbolt has no head and is usually supplied with 2 nuts.
When it comes to PDMS bolting, try not to think of the BTYP as being relative to a specific type of bolt. Rather think in terms similar to STYP in piping specs.
The difference is that in a BOLTSPEC the BTYPes have an order of priority.
If one side of a joint has a btyp of MACH and the other side has a btyp of STUD Then STUD will take priority over MAC and the bolt with the BTYP STUD in the spec will be used.
I have already posted a paper on bolting on this site. Try to read it and see if that helps a little
[QUOTE=pitch;19227]Mach and stud are not the same thing.
MACH is a machine bolt which has a Head usually hexagonal and can be supplied with or without a single nut
A stud has no head and can be supplied with or without a single nut
Studbolt has no head and is usually supplied with 2 nuts.
When it comes to PDMS bolting, try not to think of the BTYP as being relative to a specific type of bolt. Rather think in terms similar to STYP in piping specs.
The difference is that in a BOLTSPEC the BTYPes have an order of priority.
If one side of a joint has a btyp of MACH and the other side has a btyp of STUD Then STUD will take priority over MAC and the bolt with the BTYP STUD in the spec will be used.
I have already posted a paper on bolting on this site. Try to read it and see if that helps a little
Thanks Pitch for your answers.
I have been in pulp and paper for 20 year with piping and have never seen jacking bolts.
Regarding the bolting I think that I was not so good in explaining my quest.
I know the different in the reality between STUD and MACH.
Regarding the rest of the types I was thinking it as a specific type of bolt not only as a selection priority in bolt spec.
The difference between TAP and MACH or CAP is, so I have been told, is a different behaviour when it comes to selection of the actual bolt length from the list of available bolt lengths.
The theoretically bolt length is rounded DOWN to the next available for TAP bolts, while for all others the length is rounded UP to the next value.
Note that there is by default in rounding up a grace distance of .99999, i. e. 40.9999 will result in 40 mm while 41 will determine a 45 mm bolt.
Never checked the TAP behaviour myself, because we define the tap depth be the bolt diameter and then there is enough space in the hole for any additional few millimeters.
