Micro 100
Micro 100 DR-250-2 1/4" Carbide 118° Jobber Drill Bit
Carbide jobber drill bit with a 118° conventional point for general-purpose drilling
- 1/4 inch carbide drill bit for hard materials
- 118 degree point angle centres quickly in metal
- Jobber length gives standard reach for general drilling
- Bright uncoated finish resists galling in soft alloys
- Decimal equivalent 0.2500 matches fractional inch sizing
1/4″ Carbide Jobber Drill Bit
This 1/4 inch carbide jobber drill bit from Micro 100 is built for precision drilling in ferrous and non-ferrous materials. The bright uncoated finish and 118 degree conventional point provide reliable chip evacuation and centring. It suits machinists and maintenance technicians who need repeatable hole quality.
Suited for high-volume production
The solid carbide construction resists wear when drilling cast iron, composites or hardened steels where high-speed steel would dull quickly. Shops that rely on coolant-through tooling or require coated bits for stainless steel should consider alternatives.
Direct chuck fit with standard jobber shank
The straight shank seats in any 1/4 inch capacity drill chuck or collet without adapters. Common issues arise when runout exceeds holder tolerance or when feed rates cause chipping on the uncoated cutting edges.
Highlights
- 1/4 inch carbide drill bit for hard materials
- 118 degree point angle centres quickly in metal
- Jobber length gives standard reach for general drilling
- Bright uncoated finish resists galling in soft alloys
- Decimal equivalent 0.2500 matches fractional inch sizing
Specifications
| Brand | MICRO 100 |
|---|
Questions about this item
What size drill chuck is needed for the 1/4" shank on this Micro 100 bit?
A chuck that opens to at least 0.2500 in will hold the 1/4" shank securely.
Will the 118° conventional point cut cleanly in the mild steel I usually drill with high-speed steel bits?
The 118° point works in mild steel, but carbide is brittle; use rigid setups and light feed to avoid chipping.
How can I confirm the bit is cutting correctly once it is in the drill?
Look for short, curled chips and a smooth hole wall; squealing or powdery dust means the feed or speed needs adjustment.
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