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HSS Spiral Flute Step Drill Bits
Double Spiral Flute Structure Delivers Efficient Chip Evacuation, Reducing Overheating And Clogging
Premium M35 Cobalt HSS With 5% Cobalt Offers Superior Heat Resistance For Stainless Steel Drilling
118°/135° Split Point Prevents Walking, Ensuring Accurate Hole Positioning On Sheet Metal
Multi-Step Design Eliminates Multiple Bit Changes, Boosting Efficiency In Sheet Metal And Tube Work
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- M35 Cobalt Alloy Steel (HSS-Co5%) Construction Delivers Outstanding Heat And Wear Resistance, Suitable For Drilling Hard Metals Like Stainless Steel Up To 3-5mm Thick
- 118° X-Type Split Point With Self-Centering Function Prevents Walking, Ensuring Precise Hole Positioning And Clean Cuts On Sheet Metal, Aluminum, And Copper
- Quick-Change 1/4" Hex Shank (Three-Flat Shank Optional) Fits Most Electric Drills Securely, Providing Stable Performance For Continuous Drilling Tasks
- Multi-Step Design Covers 4-32mm Sizes, Allowing Users To Drill Multiple Hole Diameters With One Bit And Save Tool Replacement Time
Application Notes
Discover the versatile applications and material compatibility of our products
Drilling Aluminum Alloy
- •Step drills (also called unibit/stepped drill bits) are ideal for drilling thin to medium-gauge aluminum alloy sheets/profiles (typically ≤4 mm) and performing one-step drilling, reaming, and deburring. They are widely used in automotive, aerospace, electrical, HVAC, and aluminum fabrication industries.
Drilling Stainless Steel
- •Step drill bits are optimized for stainless steel sheets and thin profiles. Crafted from high-speed or cobalt steel, they offer outstanding hardness and heat resistance. They finish drilling, hole enlarging and deburring in one pass for precise, burr-free holes, ideal for fabrication, assembly and pipe fitting.
Real Factory & Application Videos
Watch real manufacturing and field applications to verify quality, performance, and supply capability
Wouldn’t you prefer smooth, burr-free holes in one single pass?
It delivers smooth, round and burr-free holes on aluminum alloy and stainless steel.
Still struggling with wandering drill bits while drilling metal?
The premium steel material provides high hardness and strong heat resistance.
Our Production Process
From raw materials to finished products, every step is meticulously controlled to ensure superior quality and precision.
International Certifications
Our products meet the highest international standards and are certified by leading quality organizations worldwide.
RoHS Certificate
• Expiry Date:2027.10.05
ISO 9001:2015
• Expiry Date:2028.10.05
SGS Audit Report
• Expiry Date:2028.01.05
Product Spec Table
| SKU | Key Specs | Material / Coating | Packaging |
|---|---|---|---|
| 4-12mm | 22mm Shank Diameter / 66mm Overall Length | HSS/M35/Custom Body Material/Custom Coated | Blister Pack/Plastic Box/Customization |
| 4-12mm | 22mm Shank Diameter / 68mm Overall Length | HSS/M35/Custom Body Material/Custom Coated | Blister Pack/Plastic Box/Customization |
| 4-20mm | 22mm Shank Diameter / 71mm Overall Length | HSS/M35/Custom Body Material/Custom Coated | Blister Pack/Plastic Box/Customization |
| 4-22mm | 22mm Shank Diameter / 73mm Overall Length | HSS/M35/Custom Body Material/Custom Coated | Blister Pack/Plastic Box/Customization |
| 4-30mm | 22mm Shank Diameter / 95mm Overall Length | HSS/M35/Custom Body Material/Custom Coated | Blister Pack/Plastic Box/Customization |
| 4-32mm | 22mm Shank Diameter / 102mm Overall Length | HSS/M35/Custom Body Material/Custom Coated | Blister Pack/Plastic Box/Customization |
| 4-39mm | 25mm Shank Diameter / 97mm Overall Length | HSS/M35/Custom Body Material/Custom Coated | Blister Pack/Plastic Box/Customization |
| 5-35mm | 25mm Shank Diameter / 73mm Overall Length | HSS/M35/Custom Body Material/Custom Coated | Blister Pack/Plastic Box/Customization |
| 4-40mm | 25mm Shank Diameter / 103mm Overall Length | HSS/M35/Custom Body Material/Custom Coated | Blister Pack/Plastic Box/Customization |
| 10-45mm | 25mm Shank Diameter / 98mm Overall Length | HSS/M35/Custom Body Material/Custom Coated | Blister Pack/Plastic Box/Customization |
Frequently Asked Questions
Everything you need to know about our products, customization options, and ordering process.
What is a HSS step drill bit?
An HSS Step Drill Bit, often referred to as a pagoda drill, is a conical-shaped cutting tool with a series of progressively larger "steps" or diameters. Each step acts as a separate drill size, allowing the user to create multiple hole sizes with a single tool.
How to drill a step hole?
Start by positioning the bit at the marked center and drill at a steady, moderate speed. Allow each step to cut progressively until the desired diameter is reached, avoiding excessive pressure.
How thick of metal can a step bit drill?
Step bits are primarily designed for thin-gauge materials. As a professional rule of thumb, a step bit can effectively drill metal that is no thicker than the height of an individual step (typically 4mm to 5mm).
What is another name for a step drill bit?
A step drill bit is also known as a cone drill bit or step cone drill, especially in industrial and manufacturing applications.
What is the difference between a spiral flute and a straight flute step bit?
A spiral flute step bit helps remove chips more efficiently and reduces heat during drilling. A straight flute design is more rigid and suitable for controlled drilling in thinner materials with less vibration. For B2B production lines, spiral flutes typically offer a quieter operation and a longer tool life.
What is the point of a step drill bit?
The main purpose of a step drill bit is to drill multiple hole sizes cleanly without changing tools. It improves efficiency, reduces burr formation, and is especially useful for thin materials like metal sheets and plastics.
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| Comparison Item | Straight Flute | Spiral Flute |
|---|---|---|
| Chip Removal | General chip removal, easier to clog, suitable for shallow holes. | Strong chip evacuation, automatically removes chips upward, suitable for deep holes. |
| Cooling Performance | Lower cooling efficiency, coolant is harder to reach the cutting area. | Better cooling, spiral grooves guide coolant and reduce tool burning. |
| Suitable Materials | Plastic, acrylic, thin aluminum sheet, soft wood, and thin mild steel. | Stainless steel, carbon steel, alloy steel, thick metal, and hard materials. |
| Drilling Depth | Shallow holes, generally ≤3D (D = hole diameter). | Deep holes, generally ≥3D, with better stability. |
| Cutting Stability | Very high stability, good hole roundness, and less deviation. | High stability, lower vibration, and 4-flute design offers better control. |
| Regrinding Difficulty | Easy to regrind due to simple flute geometry. | More difficult, requiring precise spiral angle control. |
| Price | Lower cost, suitable for economy-grade products. | Medium to high cost, suitable for professional-grade products. |
Related Products
Trusted by businesses worldwide
See what our global partners say about our premium drilling tools and cutting solutions.
"We purchase HSS spiral flute step drill bits for aluminum and thin alloy plate processing. Deep spiral flute design accelerates chip removal and completely avoids clogging during continuous step drilling. Quality and lead time are both reliable, we intend to sign a long-term supply agreement."
Marc Weber
Mechanical Engineering Buyer
Austria
"We have stocked spiral flute step drill bits for two years in Nordic markets. High-grade HSS material delivers outstanding wear resistance, popular with local repair shops and manufacturing clients. With stable price and reliable quality, we will keep ongoing cooperation."
Sara Nielsen
Industrial Tools Distributor
Denmark
"For auto body hole expansion, HSS spiral flute step drill bits are our top choice. It cuts car sheet metal with neat edges and far better durability than ordinary bits. The overall cooperation experience is great, we will continue bulk purchasing monthly."
Javier Ortega
Automotive Modification Workshop Owner
Norway
"We purchase HSS spiral flute step drill bits for aluminum and thin alloy plate processing. Deep spiral flute design accelerates chip removal and completely avoids clogging during continuous step drilling. Quality and lead time are both reliable, we intend to sign a long-term supply agreement."
Marc Weber
Mechanical Engineering Buyer
Austria
"We have stocked spiral flute step drill bits for two years in Nordic markets. High-grade HSS material delivers outstanding wear resistance, popular with local repair shops and manufacturing clients. With stable price and reliable quality, we will keep ongoing cooperation."
Sara Nielsen
Industrial Tools Distributor
Denmark
"For auto body hole expansion, HSS spiral flute step drill bits are our top choice. It cuts car sheet metal with neat edges and far better durability than ordinary bits. The overall cooperation experience is great, we will continue bulk purchasing monthly."
Javier Ortega
Automotive Modification Workshop Owner
Norway
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