Indexable Thread Turning Inserts Designations For Threading Insert 16 I R A 60 1 2 3 4 5 1 Insert Size 2 Application 3 Hand of Tool E External R Right Hand l (mm) d (inch) 11 1/4 I Internal L Left Hand 16 3/8 4 Thread Pitch or TPI 5 Thread Standard Partial Profile TP (mm) TPI A 0.5 ~ 1.5 48 ~ 16 Partial Profile AG 0.5 ~ 3.0 48 ~ 8 55° Partial Profile 55° G 1.75 ~ 3.0 14 ~ 8 60° Partial Profile 60° Full Profile Full Profile Value by number ISO ISO Metric 60° TP (mm) TPI UN American UN 60° 0.75 34 W Whitworth 55° 3.00 8 D017 … …