Drillco 350N Nitro 21-piece HSS Drill Bit Set Black Gold Oxide

Description

Product Overview

The Drillco 350N Nitro 21‑piece high‑speed steel (HSS) drill bit set is engineered for durability and precision. Each bit is forged from premium HSS material, then treated with a dual‑tone black and gold oxide coating that resists corrosion while providing a subtle visual cue for quick identification. The round shank features flats ground on three sides, ensuring a firm grip in standard drill chucks and reducing slippage during high‑torque applications. A 135° split point initiates cutting with minimal walking, while the right‑hand spiral flute design efficiently evacuates chips, preventing clogging and extending bit life. The set spans sizes from 1/16″ to 1/4″ in 1/64″ increments and from 9/32″ to 1/2″ in 1/32″ increments, covering the full range of screw‑machine lengths commonly required in automotive, aerospace, and general metalworking projects.

Usage

Designed for both professional mechanics and dedicated DIYers, this bit set excels in a variety of environments. In automotive repair shops, the precise tolerances and robust construction allow technicians to drill clean holes in engine blocks, transmission housings, and chassis components without excessive wear. Hobbyists working on motorcycle frames, custom bike builds, or home improvement projects will appreciate the consistent performance across the full size range, making it easy to switch between tasks without changing tools. The bits are also well‑suited for metal fabrication workshops where rapid chip removal is essential, as the spiral flutes keep the cutting area clear, reducing heat buildup and preserving the integrity of delicate alloys. Whether you are drilling into steel, aluminum, or hardened alloys, the 350N Nitro set provides the confidence needed for accurate, repeatable results.

Why Choose Us

Drillco Cutting Tools has a legacy of over three decades in producing reliable cutting solutions for demanding applications. The 350N Nitro series reflects the company’s commitment to quality control, with each bit undergoing rigorous hardness testing and dimensional inspection before leaving the factory. The black and gold oxide finish not only offers a protective barrier against rust but also reduces friction, contributing to smoother operation and longer tool life. Our round‑shank design with flats is a result of extensive field testing, ensuring that the bits stay securely seated in a variety of chuck types, from standard keyless chucks to heavy‑duty industrial models. Additionally, Drillco provides a limited warranty that covers manufacturing defects, giving customers peace of mind and reinforcing the brand’s reputation for durability and performance.

Key Features

• Premium high‑speed steel construction delivers exceptional hardness and wear resistance for long‑lasting use.
• Dual‑tone black and gold oxide coating protects against corrosion while providing a distinctive visual identifier.
• Round shank with three‑side flats ensures a secure grip in any standard drill chuck, minimizing slippage.
• 135° split point starts holes accurately with reduced walking, improving precision in critical applications.
• Spiral flute design efficiently clears chips, reducing heat buildup and extending bit life.
• Comprehensive size range from 1/16″ to 1/2″ covers most screw‑machine drilling needs in automotive and metalworking tasks.
• Backed by Drillco’s limited warranty and dedicated customer support for after‑sales assistance.

FAQ

What materials are these bits suitable for?

The 350N Nitro bits are optimized for drilling steel, stainless steel, aluminum, and other common alloys. The high‑speed steel core combined with the oxide coating provides the strength needed for tougher materials while maintaining sharpness in softer metals.

Can I use these bits in a keyless chuck?

Yes. The round shank with flats is designed to fit standard keyless chucks as well as traditional keyed chucks. The flats improve torque transfer, reducing the chance of the bit slipping during high‑torque operations.

How do I maintain the oxide coating?

To preserve the black and gold oxide finish, wipe the bits after each use to remove metal shavings and moisture. Store them in a dry environment and avoid prolonged exposure to harsh chemicals. The coating is durable, but regular cleaning will extend its protective benefits.

Is this set covered by a warranty?

Drillco offers a limited warranty that covers manufacturing defects for a period of one year from the date of purchase. If you encounter any issues related to material or workmanship, contact our customer service team for a replacement or repair.

What is the difference between this set and standard twist drill bits?

Beyond the high‑speed steel material, the 350N Nitro set features a specialized black and gold oxide coating, a round shank with flats for better chuck engagement, a 135° split point for precise starts, and spiral flutes that actively clear chips. These design elements collectively provide superior performance, especially in demanding automotive and metalworking environments.