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Product Specifications:
| Item | Threaded Shank Drill Bit |
| Aircraft Drill | Yes |
| Application | For Aviation |
| Cutting Direction | Right Hand |
| Decimal Equivalent | 0.238 |
| Depth X Dia. Ratio | 2xd |
| Drill Bit Dimension Type | Letter |
| Drill Bit Finish | Black Oxide |
| Drill Bit Grouping | Drill Bit |
| Drill Bit Material | Cobalt Steel |
| Drill Bit Point Angle | 135° |
| Drill Bit Point Type | Split Point |
| Drill Bit Size | B |
| Finish | Black Oxide |
| Finish-machining | Black Oxide |
| Flute Length | 5/16" |
| Flute Type | Spiral |
| Letter Size | B |
| Material | Cobalt |
| Material-machining | Cobalt |
| Max. Drilling Depth | 5/16" |
| No. Of Flutes | 2 |
| Overall Length | 9/16" |
| Point Angle | 135° |
| Point Type | Split Point |
| Primary Material Application | Steel |
| Primary Material Application Iso Code | P, S |
| Shank Thread Size | 1/4"-28 |
| Shank Type | Threaded |
| Shank Type-machining | Threaded |
| Spiral Direction | Right Hand |
| Web Construction | Split |
Shipping Info:
| Ship weight (kg) | 0.03 |
| Ship height (cm) | 2.54 |
| Ship length (cm) | 2.54 |
| Ship width (cm) | 2.54 |
Product Variants
| Product | Model | Flute Length | Finish | Drill Bit Size | Material-machining | Max. Drilling Depth | Decimal Equivalent | Material | Primary Material Application | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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953HS11SS | 9/16" | Black Oxide | #11 | High Speed Steel | 9/16" | 0.191 | High Speed Steel | Cast Iron, Steel | €5.29 | |
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953HS1/4ST | 5/16" | High Speed Steel | 1/4" | High Speed Steel | 5/16" | 0.25 | Steel | Cast Iron, Steel | €5.88 | |
![]() |
953CO1LS | 1 1/8" | Black Oxide | #1 | Cobalt | 1 1/8" | 0.228 | Cobalt | Steel | €8.06 | |
![]() |
953HS1LS | 1 1/8" | Black Oxide | #1 | High Speed Steel | 1 1/8" | 0.228 | High Speed Steel | Cast Iron, Steel | €6.79 | |
![]() |
953HS1ST | 5/16" | Black Oxide | #1 | High Speed Steel | 5/16" | 0.228 | High Speed Steel | Cast Iron, Steel | €6.63 | |
![]() |
953CO1ST | 5/16" | Black Oxide | #1 | Cobalt | 5/16" | 0.228 | Cobalt | Steel | €7.16 | |
![]() |
953HS1SS | 9/16" | Black Oxide | #1 | High Speed Steel | 9/16" | 0.228 | High Speed Steel | Cast Iron, Steel | €6.40 |
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ROCKY MOUNTAIN TWIST 953COBST Threaded Shank Drill Bit, B Drill Bit Size, 5/16 Inch Flute Length
€7.32 /unit




