Chicago-Latrobe
Chicago-Latrobe 50536 25/64 in 118 Degree Extra Long Drill Bit
Extra-long 25/64 inch high-speed steel drill bit with 118-degree notched point and black oxide finish for deep drilling up to 7 1/2 inches
- Extra reach for deep holes with 7 1/2 in maximum drilling depth
- Precise 118-degree notched point starts cleanly without wandering
- High-speed steel construction resists wear during general-purpose machining
- Black oxide finish reduces friction and improves chip flow
- 4xD extra-long design suits 25/64 in fractional drilling tasks
25/64 in 118° Extra Long Drill Bit
This 25/64 in high-speed steel drill bit features a 118-degree notched point and black oxide finish for general-purpose machining. The extra-long design provides a maximum drilling depth of 7 1/2 in with a 4xD length-to-diameter ratio. It suits maintenance and fabrication tasks that require reach beyond standard jobber lengths.
Upgrading from shorter or standard-point bits
Switch when hole depth exceeds the flute length of a standard jobber drill or when the 118-degree point improves centring in the material you are cutting. The notched point helps reduce walk on flat surfaces without needing a separate centre drill. The extra length is only worth it if the work piece or fixturing demands the additional reach.
Behaviour under sustained drilling load
The black oxide coating aids chip flow and reduces galling during continuous cuts at the recommended 28-degree helix angle. High-speed steel construction maintains hardness at the temperatures typical of deep-hole drilling in steel and cast iron. Chip evacuation remains the limiting factor; periodic withdrawal clears flutes and prevents binding at full depth.
Highlights
- Extra reach for deep holes with 7 1/2 in maximum drilling depth
- Precise 118-degree notched point starts cleanly without wandering
- High-speed steel construction resists wear during general-purpose machining
- Black oxide finish reduces friction and improves chip flow
- 4xD extra-long design suits 25/64 in fractional drilling tasks
Specifications
| Brand | CHICAGO-LATROBE |
|---|
Questions about this item
Will a 25/64 in drill bit fit a standard 3/8 in drill chuck?
A 25/64 in bit is larger than a 3/8 in chuck capacity. You need a 1/2 in or larger chuck to hold this shank.
How do I start a hole with the 118 degree notched point without the bit walking?
Use a centre punch to mark the exact centre, then apply steady pressure at low speed until the notched point engages the metal.
When should I replace this high-speed steel bit after drilling to the 7 1/2 in maximum depth?
Replace it when the cutting lips show visible rounding, the black oxide coating wears off the flutes, or feed pressure increases noticeably.
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