BS A103 UNIFIED ( 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 |
| 4-40 UNC | A103-AP | A103-APL | A103-AT | A103-ATL | —- | —- |
| 6-32 UNC | A103-BP | A103-BPL | A103-BT | A103-BTL | —- | —- |
| 8-32 UNC | A103-CP | A103-CPL | A103-CT | A103-CTL | —- | —- |
| 10-32 UNF | A103-DP | A103-DPL | A103-DT | A103-DTL | A103-DS | —- |
| “1/4″” UNF” | A103-EP | A103-EPL | A103-ET | A103-ETL | A103-ES | A103-EC |
| “5/16″” UNF” | A103-GP | A103-GPL | A103-GT | A103-GTL | A103-GS | A103-GC |
| “3/8″” UNF” | A103-JP | A103-JPL | A103-JT | A103-JTL | A103-JS | A103-JC |
| “7/16″” UNF” | A103-LP | A103-LPL | A103-LT | A103-LTL | A103-LS | A103-LC |
| “1/2″” UNF” | A103-NP | A103-NPL | A103-NT | A103-NTL | A103-NS | A103-NC |
| “9/16″” UNF” | A103-PP | A103-PPL | A103-PT | A103-PTL | A103-PS | A103-PC |
| “5/8″” UNF” | A103-QP | A103-QPL | A103-QT | A103-QTL | A103-QS | A103-QC |
| “3/4″” UNF” | A103-SP | S103-SPL | A103-ST | A103-STL | A103-SS | A103-SC |
| “7/8″” UNF” | A103-UP | A103-UPL | A103-UT | A103-UTL | A103-US | A103-UC |
| “1”” UNF” | A103-WP | A103-WPL | A103-WT | A103-WTL | A103-WS | A103-WC |