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Product Specifications:
| Item | Threaded Shank Drill Bit |
| Aircraft Drill | Yes |
| Application | For Aviation |
| Cutting Direction | Right Hand |
| Decimal Equivalent | 0.159 |
| Depth X Dia. Ratio | 1xd |
| Drill Bit Dimension Type | Wire |
| 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 | #21 |
| Finish | Black Oxide |
| Finish - Machining | Black Oxide |
| Flute Length | 1/4" |
| Flute Type | Spiral |
| Material | Cobalt |
| Material - Machining | Cobalt |
| Max. Drilling Depth | 1/4" |
| Number Of Flutes | 2 |
| Overall Length | 13/32" |
| 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 |
| System Of Measurement | Wire |
| Web Construction | Split |
Shipping Info:
| Ship height (cm) | 2.54 |
| Ship length (cm) | 2.54 |
| Ship width (cm) | 2.54 |
Product Variants
| Product | Model | Decimal Equivalent | Overall Length | Material | Flute Length | Primary Material Application | Drill Bit Size | Max. Drilling Depth | Finish | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
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953HS11SS | 0.191 | 1 1/4" | High Speed Steel | 9/16" | Cast Iron, Steel | #11 | 9/16" | Black Oxide | €5.29 | |
![]() |
953HS1/4ST | 0.25 | 9/16" | Steel | 5/16" | Cast Iron, Steel | 1/4" | 0.312" | High Speed Steel | €5.88 | |
![]() |
953CO1LS | 0.228 | 2 1/8" | Cobalt | 1 1/8" | Steel | #1 | 1 1/8" | Black Oxide | €8.06 | |
![]() |
953HS1LS | 0.228 | 2 1/8" | High Speed Steel | 1 1/8" | Cast Iron, Steel | #1 | 1 1/8" | Black Oxide | €6.79 | |
![]() |
953HS1ST | 0.228 | 5/8" | High Speed Steel | 5/16" | Cast Iron, Steel | #1 | 5/16" | Black Oxide | €6.63 | |
![]() |
953CO1ST | 0.228 | 5/8" | Cobalt | 5/16" | Steel | #1 | 5/16" | Black Oxide | €7.16 | |
![]() |
953HS1SS | 0.228 | 1 1/4" | High Speed Steel | 9/16" | Cast Iron, Steel | #1 | 9/16" | Black Oxide | €6.40 |
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ROCKY MOUNTAIN TWIST 953CO21VS Threaded Shank Drill Bit, #21 Drill Bit Size, 1/4 Inch Flute Length
€7.27 /unit




