Zhenjiang Cutech Tools Co., Ltd. is one of the leading manufacturers and suppliers of nitrided step drill bit in China. If you're going to wholesale the newest nitrided step drill bit made in China, welcome to get pricelist an quotation from our factory. All customized tools are with high quality and low price.
PRODUCT INTRODUCTION
Nitrided Step Drill Bit (also known as a nitriding step drill or nitrogen-coated step bit) is a specialized multi-hole drilling tool featuring a nitrogen diffusion treatment on the surface of high-speed steel (HSS). This surface treatment-commonly referred to as nitriding, nitrogen coating, -enhances the bit's hardness, wear resistance, and thermal stability compared to standard HSS step bits.
Like all step drill bits, this tool features a conical design with progressively larger stepped diameters, allowing users to drill multiple hole sizes with a single bit. The nitriding process significantly extends tool life and performance, making it suitable for professional and industrial applications where durability is critical.
PRODUCT APPLICATION
The nitrided step drill bit is suitable for a wide range of materials, particularly those with hardness below 25 HRC:
Material | Suitability | Notes |
Carbon Steel | Excellent | Up to 25 hardness rating |
Stainless Steel | Excellent | Particularly with Nitride treatment |
Sheet Metal | Excellent | Thickness <5mm recommended |
Aluminum | Excellent | Nitriding prevents material adhesion |
Copper | Good | Use lower speeds |
Plastic/PVC | Excellent | Clean, burr-free holes |
Wood | Good | Best for thin panels and planks |
Insulation Board | Good | Clean cuts, no tearing |
Fiberglass | Good | Requires careful speed control |
PRODUCT FEATURES
What is Nitriding?
Nitriding is a thermochemical surface hardening process where nitrogen is diffused into the surface of steel at elevated temperatures. For step drill bits, this treatment:
- Creates an extremely hard surface layer (typically 63-66 HRC)
- Improves wear and abrasion resistance
- Reduces friction between the bit and work-piece
- Enhances heat resistance (up to 600°C / 1112°F)
- Provides a permanent surface treatment (not just a coating that can wear off)
The result is a step drill bit that maintains its cutting edge significantly longer than untreated HSS bits, especially in demanding materials like stainless steel and sheet metal.
KEY FEATURES
1. Nitrided/Nitrogen Surface Treatment
- Diffusion hardening process permanently modifies the steel surface
- Hardness rating: 63-66 HRC (Rockwell C scale)
- Temperature resistance: Up to 600°C / 1112°F
- Friction reduction: Creates a slick surface that generates less heat during drilling
- Enhanced lubricity: Reduces material adhesion (prevents "galling" in soft metals)
2. High-Speed Steel (HSS) Construction
- HSS4241 material commonly used for nitrided step bits
- High-speed steel provides excellent shock absorption and vibration resistance
- Retains hardness at elevated operating temperatures
- Suitable for both handheld and stationary drilling applications
3. Multiple Step Diameters
One bit replaces a full set of standard twist drill bits
4. Shank Options
- Triangular/Hex shank for secure grip in chucks
- 1/4" hex shank available for quick-change compatibility
- 3-flat design prevents slipping under high torque
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