Drillco 400N120 Heavy Duty Jobber Drill Bit from the Nitro Series is engineered for precision and durability in demanding drilling applications. Measuring 5/16" in diameter, this high-performance bit is crafted from premium high-speed steel (HSS) and features a black and gold oxide finish that enhances wear resistance and heat dissipation. The Nitro series design includes a 135° split point, which allows for quick starts without walking and ensures cleaner, more accurate holes—especially in tough materials. Ideal for drilling through hardened steel, stainless steel, cast iron, and other metal surfaces, this heavy-duty jobber bit offers extended tool life and reduced friction, making it a dependable choice for professionals in manufacturing, maintenance, and metalworking.
Type: Jobber Drill Bit | Color: Black & Gold | Size (in.): 5/16 | Flute Length (in.): 3-3/16 | Overall Length (in.): 4-1/2
Features:
- Made with premium grade HSS to last longer
- Self centering 135° split-point for reduced thrust requirements and minimized walking
- Black and gold surface treatment for maximum lubricity
- Jobber length for most use cases
- Made in USA
Application:
- Drilling holes in medium and high strength materials
- Heavy-duty drilling
Technical Tips:
- Speed, feed, and lube are all critical to cutting tool performance
Looking for more information about Drillco Bits? Click here to view the Catalog
For help choosing the correct Drillco Bit for your application? please call (800) 608-5210 or email info@intlairtool.com
- Type
- Jobber Drill Bit
- Size (in.)
- 5/16
- Flute Length (in.)
- 3-3/16
- Overall Length (in.)
- 4-1/2
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