THREADING INSERT IDENTIFICATION SYSTEM Insert Identification System 16 E R M 1.50 ISO 2M IC808 1 2 3 4 5 6 7 8 1. Insert Size 6. Thread Standard I (mm) IC 60 Partial Profile 60º 06 5/32" 55 Partial Profile 55º 08 3/16" ISO ISO Metric 11 1/4" UN American UN 16 3/8" W Whitworth 22 1/2" BSPT British BSPT 27 5/8" RND Round DIN 405 TR Trapeze DIN 103 ACME ACME I STACME Stub ACME ABUT American Buttress UNJ UNJ IC NPT NPT API RD API Round 2. Application BUT API Buttress Casing E External API API I Internal H90 H-90 UE U-type, External EL Extreme Line Casing UI U-type, Internal MJ ISO 5855 UEI U-type, External and Internal 7. No. of Teeth (Optional) 2M 2 teeth 3M 3 teeth 8. Grade IC1007 U-type Regular Type IC908 3. Hand of Tool IC808 R Right-hand IC508 L Left-hand IC250 RL Right- and Left-hand IC228 IC50M 4. Type IC806 B Peripherally ground & chipformer M Press to size with a chipformer  No indication regular type 5. Pitch Full Profile (value by number) 0.35-9.0 mm 72-2 TPI Partial Profile (range by letter) mm TPI A 0.5-1.5 48-16 AG 0.5-3.0 48-8 G 1.75-3.0 14-8 N 3.5-5.0 7-5 Q 5.5-6.0 4.5-4 U 5.5-9.0 4.5-2.75 639