Laydown Threading Catalogue Numbering System Laydown Threading Boring Bar Identification System AVR203R A VR 20 3 R Shim Tool Type Coolant Shank Head Insert Hand of Requirement Capability Diameter Size Tool A— C— 10, 12, 13, 16, 20, RH — Shim required With coolant 25, 32, 40, 50 Thread symbol R N— 6.2 (Mini adjust) LH — No shim required Thread symbol L O— 8.0 (Mini adjust) Miniature holder VR — Internal round shank d L1 symbol d L1 2 6,35 11 3 9,52 16 4 12,7 22 5 15,88 27 widia.com F73