Example designation
0-1.000 BA Bolt - Close
- 0
- BA size 0, which has a nominal major diameter of 6 mm.
- 1.000
- Pitch of 1 mm for this BA size.
- BA
- British Association thread family.
- Bolt - Close
- Close external fit.
Larger numbers mean smaller threads
Choose a BA number from 0 through 16. The catalog supplies its diameter and pitch together, so entering the BA number as a millimetre diameter would describe the wrong thread.
Choose the bolt fit
The external thread offers Normal and Close fits; the internal selection is Normal. The internal major diameter has a lower limit only, so its missing upper bound is not a zero-clearance target.