BS A27 BA & BSF ( MEDIUM TENSILE STEEL NUTS )
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| ORDINARY | THIN | SLOTTED | CASTLE | |||
| NOM SIZE | RIGHT HAND THREAD | LEFT HAND THREAD | RIGHT HAND THREAD | LEFT HAND THREAD | RIGHT HAND THREAD | RIGHT HAND THREAD |
| 6BA | A27-AP | A27-APL | A27-AT | A27-ATL | —- | —- |
| 4BA | A27-BP | A27-BPL | A27-BT | A27-BTL | —- | —- |
| 2BA | A27-CP | A27-CPL | A27-CT | A27-CTL | A27-CS | —- |
| “1/4″” BSF” | A27-EP | A27-EPL | A27-ET | A27-ETL | A27-ES | A27-EC |
| “5/16″” BSF” | A27-GP | A27-GPL | A27-GT | A27-GTL | A27-GS | A27-GC |
| “3/8″” BSF” | A27-JP | A27-JPL | A27-JT | A27-JTL | A27-JS | A27-JC |
| “7/16″” BSF” | A27-LP | A27-LPL | A27-LT | A27-LTL | A27-LS | A27-LC |
| “1/2″” BSF” | A27-NP | A27-NPL | A27-NT | A27-NTL | A27-NS | A27-NC |
| “9/16″” BSF” | A27-PP | A27-PPL | A27-PT | A27-PTL | A27-PS | A27-PC |
| “5/8″” BSF” | A27-QP | A27-QPL | A27-QT | A27-QTL | A27-QS | A27-QT |
| “3/4″” BSF” | A27-SP | A27-SPL | A27-ST | A27-STL | A27-SS | A27-SC |
| “7/8″” BSF” | A27-UP | A27-UPL | A27-UT | A27-UTL | A27-US | A27-UC |
| “1”” BSF” | A27-WP | A27-WPL | A27-WT | A27-WTL | A27-WS | A27-WC |