10 Best 4 20mm Step Drill Bits Of 2026
4 20mm Step Drill Bits — Reviews, Recommendations & Updated Buying Guide September 2026
3Pcs High-Speed Steel Step Drill
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4-20mm HSS Titanium Coated Step
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Mengshen HSS High Speed Steel Step
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Jadever Shank Metal Step Drill Bit
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Luckgo Doersupp 3Pcs
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Mengshen M35 Step Drill Bit 4-20mm
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Mengshen Co Step Drill Bit 4-32mm
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AM-Zerspanungstechnik Professional
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10 Best 4 20mm Step Drill Bits Of 2026
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3Pcs High-Speed Steel Step Drill Bit Set with Automatic Spring Loaded Center Punch, 4-12mm/4-20mm/4-32mm Drill Bits Set for Sheet Metal Hole Drilling
4-20mm HSS Titanium Coated Step Drill Bit, 1/4" Hex Shank Quick Change Metric High Speed Steel Cone Drill Bit for Plastic, Wood, Metal Sheet, Aluminum Hole Drilling
3Pcs HSS Step Drill Bit Set (4-12mm/4-20mm/4-32mm) with Auto Center Punch – Durable Bits for Sheet Metal, Steel, Wood, Plastic & More – For Gun/Bench Drills, Use Coolant for Longer Life
Mengshen HSS High Speed Steel Step Drill Bit 3-Piece Set 4-12mm/4-20mm/4-32mm, Nitride Spiral Flute Triangle Handle Pagoda Drill for Carbon Steel, Sheet Iron, Insulation Boards,PVC Boards,Planks
Jadever Shank Metal Step Drill Bit, 8 mm x 4–20 mm Diameter
Luckgo Doersupp 3Pcs 3-12M/4-12Mm/4-20Mm Step Drill Bits Titanium Coated Step Drill Bits Set
Mengshen M35 Step Drill Bit 4-20mm, Cobalt Spiral Groove Large Bit Pagoda Step Drill Bit Set Hole Reamer Triangle Handle HSS Co Drilling Counterbore
Mengshen Co Step Drill Bit 4-32mm Spiral Groove, M35 HSS Multi Hole Cutting Enlarge Stainless Steel Plate Quenching Steel Plate Metal Sheet Counterbore Drilling Triangle Handle Drill Bit Set
4-20mm Step Drill Bit, Hex Shank Design, Steel Material
AM-Zerspanungstechnik Professional Step Drill | Drill Bit for Stainless Steel, Metal, Wood, Plastic | Peeling Drill | Sheet Metal Peeling Drill | Taper Drill - Diameter 4-20 mm
購入ガイド: 4 20mm Step Drill Bits
📋 目次
1What material should I look for in 4 20mm step drill bits?
High-speed steel (HSS) is standard for general use, while cobalt or titanium-coated bits offer better heat resistance and longer life when drilling harder materials like stainless steel or cast iron. Cobalt bits typically last 2-3 times longer than standard HSS in tough applications.
2How does the step size affect drilling performance?
Each step increases in diameter by 1-2mm, allowing you to drill precise, incremental holes without changing bits. A 4-step set usually covers 12-20mm, making it ideal for plumbing, woodworking, or metalwork where accuracy and efficiency matter most.
3Are there differences between metric and imperial 20mm step drill bits?
Metric bits are measured in millimeters and are standard in most countries, while imperial bits use fractions of an inch. Ensure your project requires metric sizes, as imperial equivalents for 20mm are roughly 3/4 inch, but may not align perfectly with step increments.
4What should I check for in the coating or finish of the bits?
Black oxide or titanium coatings reduce friction and heat, extending bit life and improving chip removal. Look for a uniform, non-flaking coating, as peeling or uneven finishes can lead to premature wear and inconsistent drilling results.
5How do I know if these bits are suitable for my drill press or handheld drill?
Check the shank size — typically 3/8” or 1/2” — and ensure it matches your tool. Handheld drills may require a smaller shank, while drill presses often use larger ones. A 4-step set is versatile but may need a chuck with good grip to prevent slippage during use.
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