Small Hole Boring Catalogue Numbering System How Do Catalogue Numbers Work? Each character in our catalogue number signifies a specific trait of that product. Use the following key columns and corresponding images to easily identify which attributes apply. CDHBS4T002 C D H B S4 Insert Shape Insert Clearance Tolerance Class Insert Size Angle Features T 60° B Tolerances apply priorto edge prep and coating. Code for metric cutting edge length C 80° “L10” “D” mm C G T W CG45°45° 3,97 S4 05 06 — 4,06 — — 07 — 4,76 04 06 08 S3 W 80° 6,35 06 — 11 04 D Rε Rε 9,53 09 — 16 069,80——17— P Rε D = Theoretical diameter of without chipbreakerW the insert inscribed circle Partly cylindrical S = Thickness hole, 40–60° B = See figures below countersink, single-sided with chipbreaker T tolerance tolerance tolerance toleranceclasson “D”on “B”on “S” B without chipbreakerPartly cylindrical C ±0,025 ±0,013 ±0,025 hole, 70–90° H ±0,013 ±0,013 ±0,025 countersink,single-sided E ±0,025 ±0,025 ±0,025 H with chipbreaker G ±0,025 ±0,025 ±0,013 M See tables on next page ±0,013 U See tables on next page ±0,013 D30 widia.com