Chicago-Latrobe
Chicago-Latrobe 47728 135 Degree Cobalt Jobber Drill Bit
A 7/16-inch cobalt jobber drill bit with a 135-degree split point for heavy-duty drilling
- TypeDrill Bits
- MaterialHAWA
- 135-degree split point starts on contact without walking
- Cobalt HAWA material resists heat during heavy-duty drilling
- Jobber length gives standard reach for general use
- 7/16 in fractional size matches common fastener needs
- Decimal equivalent .4375 simplifies specification matching
Chicago-Latrobe 47728 Jobber Drill Bit
This Chicago-Latrobe 47728 drill bit is a jobber-length cutting tool made from cobalt material for general-purpose drilling tasks. It features a 135-degree split point designed to reduce walking and improve starting accuracy on metal surfaces. The straw/bronze finish identifies the heavy-duty construction intended for workshop use.
Suited for metalworkers needing a 7/16 inch
Machinists and maintenance technicians drilling mild steel or stainless materials will find the cobalt composition and split-point geometry appropriate. Builders who need coolant-through capability or a different point angle for specialised alloys should look at other options.
Critical spec: 135-degree split point on cobalt
The 135-degree split point combined with cobalt material determines whether this bit matches the hardness and self-centering requirements of the job. Verify the 0.4375 decimal equivalent fits the required hole size before purchase.
Highlights
- 135-degree split point starts on contact without walking
- Cobalt HAWA material resists heat during heavy-duty drilling
- Jobber length gives standard reach for general use
- 7/16 in fractional size matches common fastener needs
- Decimal equivalent .4375 simplifies specification matching
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How does the 135-degree split point affect drilling in hard metals?
The 135-degree split point centres itself on contact and reduces walking, so it starts cleanly in cobalt-hardened steels without a centre punch.
What does the jobber-length shank limit when used in a standard drill chuck?
The jobber-length shank fits any 3-jaw chuck that accepts straight shanks up to 7/16 in, capping the maximum bit diameter the chuck can hold.
What clearance is needed behind the chuck for the 7/16-inch jobber bit?
The bit extends roughly 16 times its diameter from the chuck face, so allow at least 7 in of spindle travel and workpiece clearance.
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