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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
Head Diameter
shown as “D2”
Metric
7 = 6,60mm
8 = 8,18mm/8,20mm
10 12 5 R
Shank Diameter
shown as “D” Length/Depth shown
as “L1/L4” Lead Angle* Hand of Tool
Metric
4 = 4,00mm Bore Length for Step Bars
5 = 5,00mm Overall Length for Straight
Shank Bars
Thread Depth for Threading Bars
0 = 90°
Used for
Threading/
Grooving Bars R = Right hand
3 = 3° R
10 = 9,78mm 6 = 6,00mm 13 = 12,70mm/
12,95mm
45 = 4,57mm 8 = 8,00mm 10 = 10,00mm 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°
Metric
82 = 8,15mm 38 = 38,10mm
95 = 9,50mm 48 = 47,63mm
99 = 9,91mm 51 = 50,80mm
159 = 15,88mm 63 = 63,50mm
L = Left hand
Right-hand boring bar
5 = 5°
Left-hand boring bar
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
Head
Diameter
Shank
Diameter
*NOTE: Shown as “KRI” for metric bars.
NOTE: Only shown on stepped-style bars.
widia.com
D9
254 = 254,00mm