Chicago-Latrobe
Chicago-Latrobe 57229 29/64 in 118 Degree Split Point Drill Bit
29/64 inch jobber-length drill bit with a 118-degree split point for accurate starts in metal
- TypeDrill Bits
- MaterialHAWA
- Split-point tip starts on contact for accurate holes
- 118-degree angle suits general-purpose drilling in metal and wood
- High-speed steel construction resists wear during repeated use
- Black oxide finish reduces friction and aids chip removal
- 29/64 inch diameter matches standard fractional sizing
Size and point geometry
The Chicago-Latrobe 57229 is a jobber length drill bit sized at 29/64 in with a decimal equivalent of .4531. Its 118 degree split point design reduces walking and starts holes cleanly in metal. The high speed steel construction with black oxide finish resists wear during general purpose drilling tasks.
Material and finish benefits
High speed steel provides the hardness needed for cutting ferrous and non-ferrous metals. The black oxide surface treatment helps retain lubricant and reduces chip welding during operation. This combination extends tool life compared to uncoated carbon steel bits when used in handheld or stationary drilling applications.
Split point limitations
The 118 degree split point excels at centring without a centre punch but is not optimised for deep hole drilling or hard abrasive alloys. The lack of coolant holes means heat builds up faster in prolonged cuts. Users drilling stainless steel or deep cavities will need peck drilling cycles or a different point geometry.
Highlights
- Split-point tip starts on contact for accurate holes
- 118-degree angle suits general-purpose drilling in metal and wood
- High-speed steel construction resists wear during repeated use
- Black oxide finish reduces friction and aids chip removal
- 29/64 inch diameter matches standard fractional sizing
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
When will the 118-degree split point on this 29/64-inch bit need resharpening?
Resharpen when the split point no longer self-centres or when drilling force increases noticeably; the high-speed steel takes standard sharpening equipment.
What stops me from drilling deeper in one pass with this jobber-length bit?
The flute length limits chip evacuation; once chips pack the flutes you must withdraw to clear them or the bit will bind.
How hot does the black-oxide finish get during continuous drilling?
The oxide layer helps dissipate heat, but sustained high-speed work will still raise the bit to temperatures that require cutting fluid or pauses.
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