Hole Saws & Step Drills
Premium HSS Spiral Step Drill Bit Set (Black Finish, Tri-Flat Shank) for Metal fabrication
Fully Ground HSS Spiral Step Drills – Customizable Sizes & Tri-Flat Shank
Quick Specifications
| Product Name | Industrial HSS Spiral Step Drill Bit Set (Black Finish) |
|---|---|
| Drill Type | Step Drill Bit |
| Material | High-Speed Steel (HSS) |
| Surface Finish | Black Oxide (Rust & Wear Resistant) |
| Flute Type | Twin Spiral Flute |
| Sizes | 4-12mm, 4-20mm, 4-32mm (Fully Customizable to Client Specs) |
| Working Length | Customizable based on OEM requirements |
| Shank Type | Tri-Flat Shank (Anti-Slip) |
| Process | Fully Ground CNC |
| Application | Sheet Metal, Aluminum, PVC, Wood |
| Customized Support | Full OEM/ODM (Sizes, Shanks, Logos, Packaging) |
| MOQ | Negotiable based on packaging |
- Factory Direct Pricing
- Strict Standard QC
- Support OEM / Custom Packaging
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Product Details
Premium HSS Spiral Step Drill Bit Set (Black Finish, Tri-Flat Shank)
High-Efficiency Hole Expansion Engineered for Industrial Demands
Manufactured in Xiaoman Tools' advanced production facilities, our Black Oxide HSS Spiral Step Drill Bits are engineered to deliver precise, burr-free holes in a fraction of the time. Designed specifically for professional metal fabricators, electricians, and HVAC technicians, a single tool can drill and enlarge multiple hole diameters in sheet metals, pipes, and plastics up to 5mm thick. Backed by our robust OEM capabilities, we offer fully customizable sizing, shank types, and packaging to meet your exact wholesale requirements.
Key Technical Advantages
- Optimized Twin Spiral Flute: The deep spiral groove geometry ensures a smoother cutting experience. It drastically reduces operational noise, requires far less downward force than straight flutes, and ejects chips rapidly.
- Anti-Slip Tri-Flat Shank: Milled with three flat sides, the shank locks securely into standard drill chucks, completely eliminating bit spin-out during high-torque applications.
- 135° Split Point Tip: Increases cutting speed through aggressive self-centering. The drill bites instantly into the material without "walking" or running off-center.
- Durable Black Oxide Finish: The specialized black finish enhances corrosion resistance and retains cutting edge sharpness, providing longer life in demanding environments.
- Limitless Customization: While our standard sets cover popular ranges (4-12mm, 4-20mm, 4-32mm), our factory supports 100% custom dimensions, overall lengths, and specialized step increments tailored to your market. (Note: Designed for rotary use only).
Technical Specifications
| Manufacturer: | Xiaoman Tools (Shanghai, China) |
| Material: | High-Speed Steel (HSS) - Fully Ground |
| Surface Treatment: | Black Oxide |
| Flute Design: | Spiral Groove (2 Flutes) |
| Standard Sizes: | 4-12mm, 4-20mm, 4-32mm (Custom Sizes Welcome) |
| Shank Style: | Tri-Flat Shank (Customizable to Hex/Round) |
| Drilling Capacity: | Up to 5mm thickness |
| Target Materials: | Sheet Metal, Pipes, Plexiglass, Plastics |
