254 SMO
| Remarks | Bolt size Metric | Bolt size UNC |
| NL1/2"ss-254 | - | 1/2" |
| NL1/2"spss-254 | - | 1/2" |
| NL14ss-254 | M14 | 9/16" |
| NL14spss-254 | M14 | 9/16" |
| NL16ss-254 | M16 | 5/8" |
| NL16spss-254 | M16 | 5/8" |
| NL18ss-254 | M18 | - |
| NL18spss-254 | M18 | - |
| NL3/4"ss-254 | - | 3/4" |
| NL3/4"spss-254 | - | 3/4" |
| NL20ss-254 | M20 | - |
| NL20spss-254 | M20 | - |
| NL22ss-254 | M22 | 7/8" |
| NL22spss-254 | M22 | 7/8" |
| NL24ss-254 | M24 | - |
| NL24spss-254 | M24 | - |
| NL1"ss-254 | - | 1" |
| NL1"spss-254 | - | 1" |
| NL27ss-254 | M27 | - |
| NL27spss-254 | M27 | - |
