IR/L-W :  Internal Whitworth (BSW, BSF, BSP), full profile laydown threading inserts. IR/L - Ground periphery and rake, IRB - With a chipformer and peripherally ground, IRM - With a chipformer. Application: fittings and pipe couplings.  
 Internal left-hand shown
 
Internal thread milling Internal threading
Alternat For : 16IR 18 W , IC250 Grade Remarks
5901003 IC50M  
5902026 IC908  





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