PRODUCT DETAILS
Need crisp bottom finishes and precise engraving results on your CNC projects? Our 4mm Flat Bottom Engraving Router Bits are designed specifically for applications that demand clean pocketing, accurate surface carving, and fine detail. Whether you're working with wood, plastic, or non-ferrous metals, this bit delivers consistent results with minimal chipping and high dimensional accuracy.
4mm Cutting Diameter with Flat Bottom Design
Engineered for pocket milling, letter carving, and surface engraving — provides a smooth and level bottom finish without ridges.
Solid Carbide Construction
Crafted from premium micro-grain tungsten carbide to ensure high hardness, wear resistance, and excellent edge retention.
Precise Cutting Performance
Sharpened cutting edge for reduced burring and excellent finish — ideal for sign makers, mold manufacturers, and PCB fabricators.
Standard 4mm Shank
Compatible with most CNC routers, engraving machines, and desktop CNC units used in workshops and small factories.
Optimized for Soft to Medium-Hard Materials
Perfectly suited for acrylic, MDF, plywood, hardwood, PVC, ABS, and aluminum sheets.
CNC sign making and surface carving
PCB board engraving and isolation routing
Mold engraving and cavity finishing
Pocket cutting and 2D contouring
Nameplate and label production
Whether you're creating prototypes or doing precision decorative work, this bit helps ensure consistent finish and repeatability in high-speed operations.
Factory Direct Pricing
No middlemen. Competitive wholesale prices for global buyers and distributors.
OEM/ODM Services
We support custom tool geometry, packaging, private labeling, and coating based on your brand or market needs.
Stable Quality, Quick Delivery
Strict inspection standards and fast production turnaround — trusted by tool wholesalers and CNC factories worldwide.
Low MOQ & Global Shipping
Flexible order quantities and fast delivery via DHL, FedEx, UPS, or sea freight.
MOQ: 10 pieces per specification
Lead Time: 7–15 business days
Samples: Available upon request
Shipping: Worldwide delivery supported
Have specific dimensions or a project requirement? Reach out to our team anytime — we respond fast and help you choose the right bit for your needs.

| Shank Diameter | Angle | Tip | Overall Diameter |
| 4mm | 30° | 0.3mm | 42mm |
| 4mm | 30° | 0.3mm | 45mm |
| 4mm | 30° | 0.3mm | 47mm |
| 4mm | 30° | 0.4mm | 42mm |
| 4mm | 30° | 0.4mm | 45mm |
| 4mm | 30° | 0.4mm | 47mm |
| 4mm | 30° | 0.8mm | 42mm |
| 4mm | 30° | 0.8mm | 45mm |
| 4mm | 30° | 0.8mm | 47mm |
| 4mm | 30° | 1.0mm | 42mm |
| 4mm | 30° | 1.0mm | 45mm |
| 4mm | 30° | 1.0mm | 47mm |
| 4mm | 20° | 0.4mm | 42mm |
| 4mm | 20° | 0.4mm | 45mm |
| 4mm | 20° | 0.4mm | 50mm |
Explore more cutting tools from the same series or for similar applications
Fine Detail: Ideal for small engravings
Clean Bottoms: Smooth flat-cut finish
Light Cutting: Easy on soft materials
Multi-Use: Signs, PCB, acrylic
Heavy Cuts: Suitable for larger pockets
Wide Clearance: Fast material removal
Smooth Surfaces: Clean cavity finishing
Application: Wood, plastics, soft metals
Precision: Fine PCB & electronics work
Smooth Finish: Clean acrylic & wood cuts
Stable: Low vibration routing
Detailing: Accurate small passes
Technical insights and buying guides to help you choose the right cutting tools
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