Threading methods TPGB for internal threading External threading (Left-hand thread / Right-hand thread) External thread Toolholder Left-hand Toolholder Right-hand Insert Left-hand Insert Right-hand The direction of The direction of spindle revolution M04 spindle revolution M03 Toolholder Right-hand Toolholder Left-hand Insert Right-hand Insert Left-hand The direction of The direction of spindle revolution M04 spindle revolution M03 Right-hand thread Left-hand thread Toolholder Left-hand Toolholder Right-hand Insert Left-hand Insert Right-hand The direction of The direction of M03 M04 J spindle revolution spindle revolution Threading Toolholder Right-hand Toolholder Left-hand Insert Right-hand Insert Left-hand The direction of The direction of spindle revolution M03 spindle revolution M04 * These tables are based on KTN / KTNS / KTT / KTTX toolholder. Internal threading (Left-hand thread / Right-hand thread) Internal thread Toolholder Left-hand Toolholder Right-hand Insert Left-hand Insert Right-hand The direction of The direction of spindle revolution M04 spindle revolution M03 Left-hand thread Right-hand thread Toolholder Right-hand Toolholder Left-hand Insert Right-hand Insert Left-hand The direction of The direction of spindle revolution M03 spindle revolution M04 * These tables are based on SIN / CIN toolholder. For KITG (for large Internal threading), left-hand insert for right-hand toolholder, right-hand insert for left-hand toolholder. J52