Irwin 62128 7/16" x 12" Aircraft-Length HSS Twist Drill Bit

Irwin 62128 7/16" x 12" Aircraft-Length HSS Twist Drill Bit

The Irwin 62128 is a 7/16" x 12" aircraft-length twist drill bit built for jobs that demand serious reach. Machined from premium M-2 high-speed steel and finished in black oxide for corrosion resistance, this individually packaged twist bit pairs a 135-degree split-point tip with an extended 12" overall length so it can pass through deep framing, studs, joists, and other hard-to-reach work surfaces without repositioning the tool or drilling from both sides. The split-point geometry bites on contact with less force than a standard point, resisting the "walking" that can throw off a hole location, while the aircraft-style extended body is purpose-built for reach-critical applications rather than continuous, repetitive deep-hole drilling. Sold as a single bit rather than in a set, the Irwin 62128 is a practical addition to any drill index for electricians, plumbers, HVAC techs, and contractors who regularly need to bore through thick assemblies or awkward access points on the jobsite.

Key Features

• Trade Size: 7/16" diameter with a 12" overall aircraft length, giving the reach needed to drill through deep or obstructed work surfaces in a single pass.
• Durable Construction: Made from premium M-2 high-speed steel, a tool-grade alloy chosen for increased hardness and durability under repeated drilling cycles.
• Corrosion Resistance: Black oxide finish helps resist corrosion and rust, protecting the bit's cutting edges between uses and extending overall service life.
• 135-Degree Split-Point Tip: Starts drilling immediately with less force than a standard point and eliminates "walking" across the work surface, improving accuracy on the first pass.
• Bit Type: Standard twist-bit profile, sold as an individual bit rather than as part of a set.
• Usage Note: Engineered for applications that require extended reach; the manufacturer does not recommend this bit for continuous deep-drilling applications.

Technical Specifications

• Warranty: NLW
• Bit Type: Twist
• Individual Vs. Set: Individual
• Country of Origin: China

Typical Applications

• Extended-Reach Drilling Through Studs, Joists, and Framing
• HVAC and Plumbing Rough-In Access Holes
• General Metalworking and Fabrication Tasks
• Maintenance and Repair Projects Requiring Added Reach
• Jobsite Drilling Where Repositioning the Tool Isn't Practical

Why Irwin?

Irwin manufactures the 62128 from premium M-2 high-speed steel and applies a black oxide finish to stand up to the wear and corrosion that come with everyday jobsite use. The 135-degree split-point tip is designed to deliver an immediate, accurate start with less force, cutting down on wandering bits and redrilled holes. Combined with the bit's extended 12" aircraft length, these design choices make the Irwin 62128 a dependable, purpose-built choice for professionals who need reliable, code-ready performance when standard-length bits simply can't reach the work.