Chicago-Latrobe
Chicago-Latrobe 42628 135° Heavy-Duty Jobber Length Drill Bit 7/16 in
A 7/16-inch jobber-length drill bit with a 135-degree split point made from high-speed steel and TiAlN coating
- TypeDrill Bits
- MaterialHAWA
- 135-degree split point starts drilling on contact
- High-speed steel with TiAlN coating resists wear
- 7/16 inch fractional size matches common fastener specs
- Decimal equivalent 0.4375 ensures precise hole dimensions
- Jobber length balances reach and rigidity for heavy-duty use
Jobber Length 7/16 in Drill Bit
This Chicago-Latrobe drill bit is a jobber length tool sized at 7/16 inch with a 135-degree split point. It is made from high speed steel with a TiAlN coating for general-purpose drilling tasks. The fractional inch size suits trade and maintenance work.
TiAlN Coating and Split Point
The TiAlN surface treatment reduces friction and heat during cutting, which helps extend edge life in steel and alloy materials. The 135-degree split point centres the bit quickly and reduces wandering on hard surfaces. No coolant holes are present on this design.
For General Workshop Drilling
This bit suits mechanics and fabricators who need a durable 7/16 inch jobber drill for handheld or press use. Buyers who require coolant-through capability or a different point angle should look at other options. The decimal equivalent is .4375 inch.
Highlights
- 135-degree split point starts drilling on contact
- High-speed steel with TiAlN coating resists wear
- 7/16 inch fractional size matches common fastener specs
- Decimal equivalent 0.4375 ensures precise hole dimensions
- Jobber length balances reach and rigidity for heavy-duty use
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Will the TiAlN coating on this 42628 bit wear off and require re-sharpening?
The TiAlN coating extends edge life in high-speed steel; once the coating and substrate dull the bit can be re-sharpened on a proper grinder to restore the 135-degree split point.
What stops me from drilling deeper with this 7/16 inch jobber-length bit?
The jobber-length flute depth and lack of coolant-through holes limit chip evacuation, so deep holes in tough material will stall the bit first.
How hot does the shank get during all-day drilling with this high-speed steel bit?
High-speed steel conducts heat to the shank quickly; expect the shank to become too hot to touch during continuous use without coolant pauses.
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