--- product_id: 102639175 title: "H-Si Coated 1/4\" Shank" brand: "spetool" price: "£27.98" currency: GBP in_stock: true reviews_count: 8 category: "Spe Tool" url: https://www.desertcart.co.uk/products/102639175-h-si-coated-1-4-shank store_origin: GB region: United Kingdom --- # 0.25mm ultra-fine tip radius H-Si coating for 55HRC hardness 2-flute precision design H-Si Coated 1/4" Shank **Brand:** spetool **Price:** £27.98 **Availability:** ✅ In Stock ## Summary > ⚡ Elevate your CNC game with precision that demands attention! ## Quick Answers - **What is this?** H-Si Coated 1/4" Shank by spetool - **How much does it cost?** £27.98 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/102639175-h-si-coated-1-4-shank) ## Best For - spetool enthusiasts ## Why This Product - Trusted spetool brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Pro-Grade CNC Ready:** Fits standard 1/4" routers for seamless integration into your workflow - • **Optimized Spiral Design:** 2-flute tapered ball nose for smooth, efficient cuts every time - • **Pinpoint Precision Cutting:** 0.25mm ball radius for ultra-fine detail work - • **Durability Meets Performance:** H-Si coating ensures long-lasting sharpness and 55HRC hardness - • **Versatile Material Compatibility:** Effortlessly carves hardwood, aluminum, acrylic, and more ## Overview The SpeTool Tapered Ball Nose End Mill features a razor-sharp 0.25mm tip radius and a durable H-Si coating rated at 55HRC, designed for high-precision 2D/3D CNC engraving and carving. Its 2-flute tapered ball nose design ensures smooth, efficient cutting across a wide range of materials including hardwoods, metals, and acrylics, making it a versatile and reliable choice for professional-grade projects. ## Description SpeTool Tapered Ball Nose End Mill 1/4" X 3" with 0.5mm Tip Diameter(0.25mm Radius) Ball Nose 5.26Deg for CNC Machine Engraving Carving Bits H-Si Coated: desertcart.com: Industrial & Scientific Review: Very sharp and perfect for fine details - Very sharp well designed and works perfectly on my CNC router. Review: Great bits for the money! - These are great bits. Sharp and long lasting. I used one bit to do an inlayed cutting board. It was used to cut maple, walnut, Purple Heart, padauk, and yellow heart. All cuts were clean and sharp! ## Features - SPECIFICATION. 2 flute, 0.25MM ball radius, 5.26deg, 1-1/4" CL, 3" OL, 1/4" shank, H-Si coated, 55HRC, can be used on routers with 1/4" collect; - 2-FLUTE DESIGN. Tapered angle Ball Nose End Mill / Cone Cutters, super design for carving and clearing edge; ball nose and spiral design, ensuring smooth and efficient cutting through various materials - APPLICABLE MATERIALS. SpeTool CNC bits for Carving, suitable for 2D/3D carving Hard wood, Plywood, Soft wood, OAK, MDF, Aluminum, Alloy Copper and Acrylic etc. - WIDE APPLICATION. The cnc spiral router bit with ball end perfect for CNC engraving machine, Woodworking, Metal Engraving, Mold Making, detail carving, 2D/3D engaraving, fine detail work; - DURABLE AND PRECISE. SpeTool tapered end mills deliver exceptional durability and precise results, even during demanding projects(long service life for sharpen). ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07B942PQL | | Best Sellers Rank | #55,159 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #9 in Ball Nose End Mills | | Brand Name | SpeTool | | Corner Radius | 0.5 Millimeters | | Customer Reviews | 4.6 out of 5 stars 211 Reviews | | Cut Type | Center Cutting | | Cutting Diameter | 0.5 Millimeters | | Cutting Length | 1-1/4 Inches | | End Cut Type | Ball End | | Finish Type | AlTiN | | Finish Types | AlTiN | | Helix Angle | 3 Degrees | | Item Dimensions L x W | 3"L x 0.25"W | | Item Weight | 0.02 Kilograms | | Manufacturer | SpeTool | | Number of Cutting Edges | 2 | | Number of Flutes | 2 | | Shape | Round | | Size | D=0.5MM | | Size Name | D=0.5MM | | Tolerance Held | standard | | Unit Count | 1.0 Count | ## Product Details - **Cutting Diameter:** 0.5 Millimeters - **Cutting Length:** 1-1/4 Inches - **Finish Type:** AlTiN - **Number of Flutes:** 2 - **Size:** D=0.5MM ## Images ![H-Si Coated 1/4" Shank - Image 1](https://m.media-amazon.com/images/I/510HW79cfzL.jpg) ## Questions & Answers **Q: How does h-si coating compare to ticn? google doesn't give much info on h-si, is why i ask.** A: I've been using this cutter on brass and Aluminum with good success. The coating is not as good as say TiAlN but still very good on sticky material like Al. **Q: Typical speed and feeds for wood?** A: Yeah, router rpm speed of 18000 or so. Find the feed rate and depth that works best with your wood. **Q: is it up cut?** A: Yes it is **Q: Are these made in china or usa** A: China ## Customer Reviews ### ⭐⭐⭐⭐⭐ Very sharp and perfect for fine details *by M***N on March 18, 2026* Very sharp well designed and works perfectly on my CNC router. ### ⭐⭐⭐⭐⭐ Great bits for the money! *by A***R on December 15, 2025* These are great bits. Sharp and long lasting. I used one bit to do an inlayed cutting board. It was used to cut maple, walnut, Purple Heart, padauk, and yellow heart. All cuts were clean and sharp! ### ⭐⭐⭐⭐⭐ Bit for 3d milling *by H***H on October 20, 2025* Worked beautifully! ## Frequently Bought Together - SpeTool Tapered Ball Nose End Mill 1/4" X 3" with 0.5mm Tip Diameter(0.25mm Radius) Ball Nose 5.26Deg for CNC Machine Engraving Carving Bits H-Si Coated - SpeTool 1/8 Inch Spiral Downcut Router Bit 1/4 Inch Shank Extra Long 3 Inch with Extra Long Life Coating CNC Carbide Router Wood Bits - SpeTool Tapered Ball Nose Spiral Router Bit 1.0mm Tip Diameter (0.5mm Radius) 4.82 Deg for CNC Milling Engraver Carving Bits --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/102639175-h-si-coated-1-4-shank](https://www.desertcart.co.uk/products/102639175-h-si-coated-1-4-shank) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-19*