Chicago-Latrobe
Chicago-Latrobe 49228 Screw Machine Drill Bit 7/16 in 135 Degrees
A 7/16 inch screw machine drill bit with a 135-degree split point for accurate starting
- TypeDrill Bits
- MaterialHAWA
- 7/16 in size drills standard holes
- 135-degree split point starts on contact
- High-speed steel resists wear in metal
- Black oxide finish reduces friction and rust
- Right-hand cutting clears chips efficiently
Precision 7/16 in drill bit
The Chicago-Latrobe 49228 is a screw-machine drill bit sized at 7/16 inch with a 135-degree split point. Made from high-speed steel with a black oxide finish, it is designed for right-hand cutting in general-purpose drilling tasks.
135-degree split point
The 135-degree split point is the specification that determines suitability; it centres the bit quickly and reduces walking on hard materials. This geometry works well in steel and alloy but is not intended for deep-hole or coolant-fed operations.
Decimal equivalent 0.4375 in
The bit drills a 0.4375 inch hole, covering standard 7/16 inch clearance and tapping requirements. It lacks coolant-through capability, so chip evacuation and heat become limiting factors in deep or high-speed production runs.
Highlights
- 7/16 in size drills standard holes
- 135-degree split point starts on contact
- High-speed steel resists wear in metal
- Black oxide finish reduces friction and rust
- Right-hand cutting clears chips efficiently
Specifications
| Brand | CHICAGO-LATROBE |
|---|---|
| Type | Drill Bits |
| Material | HAWA |
Questions about this item
How does the 135-degree split point behave once the bit is in a drill?
The 135-degree split point centres itself on contact, reduces walking and cuts cleanly in high-speed steel without needing a pilot hole
What shank standard does this bit use and what chuck size does it require?
It has a straight shank sized at .4375 in decimal equivalent, so it fits any three-jaw chuck that opens to at least 7/16 in
What physical clearance is needed to mount and use this bit?
The bit measures 7/16 in diameter with a right-hand cutting direction, so the workpiece and fixture must allow that full width and rotation clearance
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