ER/L-UN : External American UN full profile (UN, UNC, UNF, UNEF) laydown threading inserts. ER/L - ground periphery and rake, ERB - with a chipformer and peripherally ground, ERM - with a chipformer for general industry.
External right-hand shown
External right-hand shown
Alternative For : 16ERM 20 UN , IC250
| Catalog No | Item | Grade | Remarks | AlternateDesc |
| 5901570 | 16ERM 20 UN | IC908 | | 0 |