Additional Bolting Items
- Last UpdatedAug 18, 2025
- 1 minute read
Each type of bolt can have further material associated with it, such as washers, nuts, locking nuts and isolation tubes. The BLTREFs of the bolt SPCOMs point to SBOLT elements. SBOLTs have the attribute BITEMS, which is a word array with up to 25 elements. Each word represents a BTYP selector for a further bolt SPCOM in the Bolt Specification, such as NUT, LNUT, WASH or ISOL. This generates a further selection of material from the Bolt Specification.
Consider the following example extracted for a single bolt diameter in a Bolt Specification.
|
Example: |
|||||||
|
TYPE DEFAULT |
NAME |
BDIA |
BTYP |
CATREF |
DETAIL |
MATXT |
BLTREF |
|
- |
- |
- |
STUD |
||||
|
BOLT |
*/BOLTS:M |
0.5/8 |
STUD |
/BOLT1 |
/STUD |
/A193-B7 |
/SS-FAMS-M |
|
BOLT |
*/NUT:M |
0.5/8 |
NUT |
/NUT1 |
/NUT |
/A193-B7 |
=0 |
|
BOLT |
*/WASH:M |
0.5/8 |
WASH |
/WASH1 |
/WASH |
/A193-B7 |
=0 |
The SBOLT element holds the list of bolt item STYPs, their lengths, and the extension thread length. For example, the SBOLT given by /SS-FAMS-M may have the following attributes:
|
SBOL |
/SS-FAMS-M |
||||
|
BITEMS |
NUT |
WASH |
WASH |
Bolt item STYPs |
|
|
BLIST |
0.1/2 |
0.1/16 |
0.1/16 |
Bolt item lengths |
|
|
XLEN |
0.1/8 |
Extension thread length |
Each additional bolt item may have an effect on the calculated length of the bolt (see Additional Bolting Items in Bolt Length Calculations).