Chicago-Latrobe
Chicago-Latrobe 45902 135 Degree Heavy-Duty Jobber Length Drill 12 mm
A 12 mm jobber length drill bit with a 135 degree split point made from high speed steel with black oxide finish
- TypeDrill Bits
- MaterialHAWA
- 135-degree split point starts holes precisely without wandering
- 12 mm high-speed steel body resists wear in tough materials
- Black oxide finish reduces friction and extends cutting life
- Jobber length gives standard reach for general drilling tasks
- Decimal equivalent .4724 simplifies metric-to-imperial conversion
Chicago-Latrobe 45902 12 mm Drill Bit
This Chicago-Latrobe 45902 drill bit is a 12 mm jobber length tool made from high speed steel with a black oxide finish. It features a 135 degree split point designed for self-centering and reduced thrust. The decimal equivalent is .4724 inches and the bit is non-coolant through with zero coolant holes.
Suited for precision drilling in metal
The 135 degree split point suits machinists and maintenance technicians who need accurate hole starts in hard materials without a centre punch. Buyers who require coolant-through capability for deep hole drilling or high volume production should look at alternative tooling. The jobber length provides standard reach for general workshop applications.
135 degree split point geometry
The 135 degree split point is the specification that determines suitability for hard materials and self-centering requirements. This point angle reduces walking and lowers the force needed to penetrate tough alloys compared to flatter point designs. Verify that your material and machine setup match this geometry before purchase.
Highlights
- 135-degree split point starts holes precisely without wandering
- 12 mm high-speed steel body resists wear in tough materials
- Black oxide finish reduces friction and extends cutting life
- Jobber length gives standard reach for general drilling tasks
- Decimal equivalent .4724 simplifies metric-to-imperial conversion
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
Should I choose the 12 mm jobber length or a different size for my application?
The 12 mm diameter with jobber length suits general-purpose drilling in metal; match the bit to the hole size your project requires.
What does the 135-degree split point do once the bit is in the drill?
The 135-degree split point centres itself on contact, reduces walking, and lowers thrust force for faster, cleaner holes in steel.
How does the high-speed steel and black-oxide finish affect drilling performance?
High-speed steel retains hardness at cutting temperatures while the black-oxide finish adds lubricity and resists corrosion during use.
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