The Center Drill BS-4 is a combined center drill and countersink tool manufactured as per British Standard BS 328 Type 4.
It is designed to drill a center hole and countersink in a single operation, providing a strong seating for the lathe center and preventing chipping at the edges of the hole.
| Common Info | |
| Country of origin | India |
| HSN Code | 82075000 |
| Center Drill | |
| Type | Center Drill BS-4 (British Standard Type 4 – Combined Drill & Countersink) |
| Material | HSS |
| Coating | Uncoated |
| Drill angle | 60° |
| Size | Pilot Dia (d1) = 1/8" Body Dia (d2) = 5/16" Pilot Length (l1 max) = 3/16" Pilot Length (l1 min) = 5/32" Overall (l2) =2.1/4" |
| Shank Diameter | 6 mm |
| Application | Steel / Stainless Steel / Aluminum |