---
product_id: 102639175
title: "H-Si Coated 1/4\" Shank"
brand: "spetool"
price: "$61"
currency: NZD
in_stock: null
reviews_count: 12
category: "Spe Tool"
url: https://www.desertcart.nz/products/102639175-h-si-coated-1-4-shank
store_origin: NZ
region: New Zealand
---

# 0.25mm ultra-fine tip radius 2-flute precision design H-Si coating for 55HRC hardness H-Si Coated 1/4" Shank

**Brand:** spetool
**Price:** $61
**Availability:** ❌ Out of Stock

## Summary

> 🔧 Elevate your CNC game with precision that commands attention!

## Quick Answers

- **What is this?** H-Si Coated 1/4" Shank by spetool
- **How much does it cost?** $61 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/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

- • **Pinpoint Precision Cutting:** 0.25mm ball radius for ultra-fine detail carving
- • **Durability Meets Performance:** H-Si coating ensures long-lasting sharpness and wear resistance
- • **Optimized for CNC Excellence:** 2-flute tapered ball nose design for smooth, efficient cuts
- • **Versatile Material Compatibility:** Effortlessly carves hardwood, aluminum, acrylic, and more
- • **Engineered for Professional Results:** Perfect for 2D/3D engraving, mold making, and fine detail work

## Overview

The SpeTool Tapered Ball Nose End Mill features a razor-sharp 0.25mm tip radius and a 2-flute design coated with high-strength H-Si for exceptional durability. Measuring 1/4" shank by 3" length, it delivers smooth, precise cuts across a wide range of materials including hardwoods, metals, and acrylics—ideal for professional-grade CNC engraving and carving 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: 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!
Review: The finer point CNC router bits - These bits are impressive. They provide for precise CNC carving.

## 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 | #56,104 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #11 in Ball Nose End Mills |
| Brand | SpeTool |
| Corner Radius | 0.5 Millimeters |
| Cut Type | Center Cutting |
| Cutting Diameter | 0.5 Millimeters |
| Cutting Length | 1-1/4 Inches |
| Date First Available | March 7, 2018 |
| End Cut Type | Ball End |
| Finish Type | AlTiN |
| Helix Angle | 3 Degrees |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.634 ounces |
| Item model number | R0.25-D1/4-G |
| Manufacturer | SpeTool |
| Number of Cutting Edges | 2 |
| Number of Flutes | 2 |
| Product Dimensions | 3"L x 0.25"W |
| Shape | Round |
| Size | D=0.5MM |
| Tolerance Held | standard |

## 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)

## Available Options

This product comes in different **Size, Number Of Items** options.

## 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

### ⭐⭐⭐⭐⭐ 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!

### ⭐⭐⭐⭐⭐ The finer point CNC router bits
*by A***R on October 12, 2025*

These bits are impressive. They provide for precise CNC carving.

### ⭐⭐⭐⭐⭐ 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

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**Shop now:** [https://www.desertcart.nz/products/102639175-h-si-coated-1-4-shank](https://www.desertcart.nz/products/102639175-h-si-coated-1-4-shank)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-25*