Small Hole Boring Bars Catalogue Numbering System By referencing this easy-to-use guide, you can identify the correct product to meet your needs. CSBM5210125R 52 10 12 5 R Head Diameter Shank Diameter Length/Depth shown Lead Angle* Hand of Tool shown as “D2” shown as “D” as “L1/L4” Metric Metric Bore Length for Step Bars 0 = 90° R = Right hand 7 = 6,60mm 4 = 4,00mm Thread Depth for Threading Bars Used forThreading/ L = Left hand 8 = 8,18mm/8,20mm 5 = 5,00mm Overall Length for Straight Grooving Bars 10 = 9,78mm 6 = 6,00mm Shank Bars Right-hand boring bar 13 = 12,70mm/ 8 = 8,00mm 3 = 3° R 12,95mm 45 = 4,57mm 10 = 10,00mm Metric 5 = 5° 48 = 4,80mm 12 = 12,00mm 12 = 12,70mm 7 = 7° 52 = 5,16mm 16 = 16,00mm 19 = 19,05mm 225 = 22.5˚ 53 = 5,30mm 22 = 22,23mm 30 = 30° 64 = 6,60mm 25 = 25,40mm 45 = 45° 66 = 6,55mm/6,60mm 32 = 31,75mm 60 = 60° 82 = 8,15mm 38 = 38,10mm 95 = 9,50mm 48 = 47,63mm 99 = 9,91mm 51 = 50,80mm Left-hand boring bar 159 = 15,88mm 63 = 63,50mm L 64 = 64,00mm 76 = 76,00mm 79 = 79,38mm 100 = 100,58mm/ 101,50mm/ 101,60mm 102 = 101,60mm 127 = 127,00mm 152 = 152,00mm 152,40mm 178 = 177,80mm 179,90mm 203 = 203,20mm 254 = 254,00mm Head Diameter Shank Diameter *NOTE: Shown as “KRI” for metric bars. NOTE: Only shown on stepped-style bars. widia.com D9