Fukuda Seiko, Japan
Fukuda Seiko CB Sinking Milling Cutter (for Hexagon Socket Head Bolts)
Made in Japan
Manufacturer: Fukuda Seiko
Model: CB
Milling cutter for machining sunken holes for hexagon socket head bolts. The nominal dimensions are the same as those of commercially available bolts with holes.
Material: HSS (SKH51)
Number of blades: 4
Guide diameter tolerance: 0 to -0.05
Blade diameter tolerance: 0 to +0.2
Lead angle: Right twist 25°
■ Sinking milling cutter (for hexagon socket head bolts)
| name | Guide diameter (φD1) | Guide Chief ( 1) | Blade diameter (φD) | Blade length ( ) | Overall length (L) | Shank diameter (φd) |
| 3 | 3.2 | 4 | 5.9 | 6 | 38 | 6 |
| 4 | 4.2 | 5 | 7.4 | 8 | 45 | |
| 5 | 5.2 | 7 | 8.9 | 10 | 53 | |
| 6 | 6.2 | 8 | 10.4 | 12 | 60 | 8 |
| 8 | 8.2 | 10 | 13.4 | 14 | 69 | 10 |
| 10 | 10.3 | 12 | 16.8 | 16 | 76 | 12 |
| 12 | 12.3 | 14 | 18.8 | 18 | 85 | |
| 14 | 14.3 | 16 | 24 | 20 | 90 | |
| 16 | 16.3 | 18 | 26 | 22 | 100 |
■ Sinking milling cutter (for hexagon socket head bolts) (inch size)
| name | Guide diameter (φD1) | Guide Chief ( 1) | Blade diameter (φD) | Blade length ( ) | Overall length (L) | Shank diameter (φd) |
| 1/8″ | 3.4 | 4 | 6.2 | 6 | 38 | 6 |
| 3/16″ | 4.96 | 7 | 8.7 | 10 | 53 | |
| 1/4″ | 6.55 | 8 | 11 | 12 | 60 | 8 |
| 5/16″ | 8.25 | 10 | 14 | 14 | 69 | 10 |
| 3/8″ | 9.8 | 12 | 15 | 16 | 76 | 12 |
| 1/2″ | 13.2 | 14 | 20 | 18 | 85 | |
| 5/8″ | 16.5 | 18 | 26 | 22 | 100 |
