4-20mm Titanium Step Drill Bit (JDJD1402) – 2mm/Step High-Speed Steel Cone Cutter | Premium Multi-Stage Round Shank Boring Bit for Sheet Metal | JADEVER

Jadever 4-20mm HSS Titanium Step Drill Bit (9-Stage Multi-Diameter Cone, 2mm Step Increments, High-Speed Steel Sheet Expansion Bit, Round Shank)

Bore clean, perfectly round, burr-free holes through sheet metals, plastics, and laminates without carrying a heavy pouch of 9 individual twist drill bits. The Jadever JDJD1402 Step Drill Bit completely replaces old-fashioned twist drills that easily catch, tear, or warp thin sheet metals into ugly, distorted triangles. By utilizing a balanced, progressive concentric step cone layout, this premium bit acts as its own center punch and step-by-step reamer—giving electrical panel fabricators, automotive garage mechanics, and layout technicians an ultra-fluid, zero-snag drilling experience across thin structural surfaces.

9-Stage Progressive Multi-Diameter Matrix & 2mm Step Increments

• 9-in-1 Compact Step Infrastructure: Precision-engineered with nine distinct, step-down diameter levels built onto a single high-speed steel core axis:

  • $4\text{mm} \ | \ 6\text{mm} \ | \ 8\text{mm} \ | \ 10\text{mm} \ | \ 12\text{mm} \ | \ 14\text{mm} \ | \ 16\text{mm} \ | \ 18\text{mm} \ | \ 20\text{mm}$

• Balanced 2mm / Step Depth Gradient: Each step features a uniform 2mm depth increment wall thickness. This layout allows you to punch clean, stepped holes through industrial sheet iron, copper plates, aluminum panels, and rigid PVC boxes with total depth tracking control.

• Self-Centering Split-Point Apex Tip: The very tip of the bit is ground into a sharp split-point pilot apex. This entirely eliminates the frustrating “bit walking” or skating across smooth metal panels, allowing you to start hole drilling immediately without first using a center punch tool.

Titanium Protective Membrane & Universal Round Shank

• High-Hardness Titanium Nitride (TiN) Finishing Coating: The entire outer high-speed steel body is coated in a dense, industrial-grade Titanium finish layer. This golden membrane layer increases surface lubrication, drops friction cutting heat by up to 30%, and prevents metal chips from welding onto the cutting edge, drastically pushing back tool wear limits.

• Dual-Fluted High-Velocity Chip Extraction Paths: Cut with an advanced dual-flute geometry path. The two balanced cutting faces shave metal uniformly from both sides, balancing the drilling forces to eliminate chatter vibrations while clearing out waste spirals instantly.

• Universal Concentric Round Shank Fitment: Machined with a robust, balanced round shank profile. This universal shank seats perfectly flush into standard 10mm ($3/8\text{“}$) and 13mm ($1/2\text{“}$) keyed or keyless three-jaw drill chucks on standard cordless drills and corded bench presses.

Product Specifications:

• Drilling Capacity Spectrum Range: 4 mm Minimum to 20 mm Maximum Outer Bore Diameter

• Step Progression Sizing Gradient: 2 mm Linear Increments (9 Structural Stages total)

• Core Base Metallurgy Material: Premium Forged High-Speed Steel (HSS Core)

• Surface Protection Finishing Membrane: High-Lubricity Friction-Reducing Titanium Coating

• Tool Chuck Shank Configuration: Universal Concentric Round Drive Shank

• Target Material Processing Group: Sheet Iron, Mild Steel Panels, Aluminum Sheets, Copper plates, Rigid PVC Trunking, Fiber Laminates, Acrylic Boards

• Packaging Layout: Completely enclosed inside a heavy-duty, factory descriptive double blister pack.

Best Use Cases

• Commercial Electrical Control Panel & Junction Box Layouts: The absolute daily benchmark accessory for electrical contractors in Salem to cleanly enlarge entry holes in sheet metal distribution boards, punch custom cable paths in plastic DB boxes, and fit knockout fittings rapidly.

• Automotive Sheet Metal & Custom Accessory Mounting: Perfect for car garage mechanics to bore clean auxiliary mounting holes through thin vehicle firewalls, install dashboard accessories, and dress sheet metal repair patches without structural distortion.

• Pencil Carving Art Studio Custom Acrylic & Base Display Fabrication: An exceptional layout asset for pencil carving artists to drill flawless, crack-free, perfectly round holes through thick acrylic display frames, step-bore custom wood or soft stone pedestal mounting bases, and ream out display plate entries with complete hand tracking control.

• HVAC Conduit Routing & Plumbing Sheet Entry Preparation: Ideal for ventilation installers to punch clean holes through galvanized sheet iron ductworks, expand piping entries, and deburr raw metal holes smoothly.

TK Pro Tip: A step drill bit is a magnificent high-speed sheet metal processing instrument, and matching your drill spindle rotation speed to the target diameter is the absolute secret to achieving textbook clean cuts while preventing thermal edge burning! Remember that as a step bit plunges deeper and transitions to a larger diameter step (e.g., jumping from 6mm out to 16mm or 20mm), the linear cutting speed at the outer edge increases dramatically. To keep the bit from overheating and losing its hardness temper, always slow your drill’s trigger RPM down as you move up into the larger diameter steps. When drilling through sheet steels or copper plates, always drop a few drops of general workshop cutting oil or light lubricant directly onto the active step face—this keeps the cutting action cool as silk, ensures the titanium edge shaves smoothly, and yields a polished, burr-free edge boundary without hard cleanup work!

The TK Tools Promise

• Verified: 100% original, factory-authentic Jadever industrial drilling accessories—sourced directly and verified for true High-Speed Steel cores and genuine 4-20mm titanium step step tolerances.

• Flute Symmetrical & Shank Straightness Bench Check: Because precise hole enlargement demands absolute axial alignment and zero wobble, our technical team in Salem manually unboxes every single step drill bit, measures step diameters under digital micrometer gauges, inspects the dual-flute cutting apex under intense lighting for zero microscopic burrs or dull spots, and checks the round shank for perfect concentric straightness before approving the double blister pack for final warehouse dispatch to guarantee vibration-free boring right out of the box.

• Fast Delivery: Wrapped securely inside custom shock-absorbent multi-layer cushioning and shipped rapidly from our main central facility straight to your garage workbench desk, retail store counter, or active project site tool chest.