ISODRAFT
User Guide
Bolting
:
Bolt Specifications
: Bolt Selection from Specification
Bolt Selection from Specification
Each SBOLT element in the catalogue is referenced by an SPCOM in the Bolt Specification. Bolts are selected individually for each BLTP from the Specification for the appropriate Bolt Diameter and Bolt Type (BTYP). Examples of valid BTYPs are:
MACH
machine bolts
STU
stud bolts
CAP
cap screws
JACK
jacking screws
TAP
tapped holes
A BTYP of BOLT will also be used as a pointer to the default bolt type, set in the specification. This can easily be set by altering the value for BTYP in the DEFAULT column of the specification. This implies that a separate line for each required BTYP must be included in the Specification for each size of bolt.
The way the selection works is explained in the following rules:
•
If the BTYP for both sides of a joint is set to BOLT, the default bolt of the given diameter is used.
•
If the BTYP for one side of the joint is set to BOLT and the other side is set to anything other than BOLT, the type of bolt specified by that BTYP will be used.
For example, a bolted through flange may have its BTYP set to BOLT, and the mating flange may require cap screws and have its BTYP set to CAP. In this case, the cap screw overrides the default type, and the selected BTYP will be CAP.
•
If both BTYPs are the same and are not set to BOLT, the bolt with that BTYP is selected.
•
If the BTYPs are not equal and are also not set to BOLT, the BTYP from the start of the bolt is selected.
1974 to current year.
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