Chicago-Latrobe
Chicago-Latrobe 47729 29/64 in 135 Degree Cobalt Jobber Drill Bit
A 29/64 inch cobalt jobber drill bit with a 135 degree split point for hard-metal drilling
- TypeDrill Bits
- MaterialHAWA
- Cobalt construction resists heat and wear
- 135-degree split point starts on contact without walking
- 29/64 inch diameter suits medium-duty holes
- Decimal equivalent 0.4531 inch for precise sizing
- Jobber length balances reach and rigidity
Chicago-Latrobe 29/64 in Cobalt Drill Bit
This Chicago-Latrobe jobber drill bit is made from cobalt steel for hardness and heat resistance in metal drilling. The 135-degree split point starts on contact and reduces wandering across the workpiece. It suits maintenance, fabrication and general workshop tasks.
Suits metal drilling, not wood or masonry
The cobalt construction and split-point geometry are tuned for steel and alloy work. Users who primarily drill wood, plastic or masonry should choose a bit designed for those materials. Buyers needing coolant-through capability or a different point angle must select another model.
29/64 inch size with 135-degree split point
The fractional diameter of 29/64 inch (decimal equivalent .4531) determines hole size and tap compatibility. The 135-degree split point controls chip formation and centring accuracy in metal. Verify both values against your drawing or tap chart before ordering.
Highlights
- Cobalt construction resists heat and wear
- 135-degree split point starts on contact without walking
- 29/64 inch diameter suits medium-duty holes
- Decimal equivalent 0.4531 inch for precise sizing
- Jobber length balances reach and rigidity
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
What drill chuck capacity do I need to hold the 29/64 inch shank?
A chuck that opens to at least 29/64 inch or its decimal equivalent .4531 inch will secure the bit.
Can I run this cobalt bit in the same handheld drill I used for high-speed steel bits?
Yes, the 135 degree split point works in standard portable drills; cobalt tolerates higher heat so cutting fluid is still recommended.
How do I confirm the 135 degree split point is cutting correctly after I start drilling?
The bit should self-centre without a centre punch, produce short copper-coloured chips and advance steadily with firm pressure.
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