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HSS Center Drills (BS328)
- HSS center drills (BS 328) are standard drills used for creating centering or starting holes for subsequent machining operations.
- They are manufactured to meet the BS 328 standard, which defines their geometry and dimensions.
- They are available in two types: Type A for center holes without a protective chamfer and Type B for center holes with a protective chamfer.
| Cat No | BS No | Body Dia | Pilot Dia | O.A.L | ||
|---|---|---|---|---|---|---|
| GCD-5441 | 1 | 1/8" | 3/64" | 1.1/2" | ||
| GCD-5442 | 2 | 3/16" | 1/16" | 1.3/4" | ||
| GCD-5443 | 3 | 1/4" | 3/32" | 2" | ||
| GCD-5444 | 4 | 5/16" | 1/8" | 2.1/4" | ||
| GCD-5445 | 5 | 7/16" | 3/16" | 2.1/2" | ||
| GCD-5446 | 6 | 5/8" | 1/4" | 3" | ||
| GCD-5447 | 7 | 3/4" | 5/16" | 3.1/2" |
| Cat No | GCD-5441, GCD-5442, GCD-5443, GCD-5444, GCD-5445, GCD-5446, GCD-5447 |
|---|---|
| BS No | 1, 2, 3, 4, 5, 6, 7 |
| Body Dia | 1/8", 3/16", 1/4", 5/16", 7/16", 5/8", 3/4" |
| Pilot Dia | 3/64", 1/16", 3/32", 1/8", 3/16", 1/4", 5/16" |
| O.A.L | 1.1/2", 1.3/4", 2", 2.1/4", 2.1/2", 3", 3.1/2" |
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