Complete Guide to Nachi Cutting Tools: History, Product Lines & Grade Selection
About Nachi
Nachi-Fujikoshi Corp., commonly known as Nachi, is a Japanese industrial manufacturer founded in 1928 in Toyama, Japan. While the company is perhaps best known for its industrial robots and hydraulic systems, Nachi’s cutting tool division produces high-quality high-speed steel (HSS), cobalt HSS, and solid carbide cutting tools. The company’s full name, Nachi-Fujikoshi, reflects the merger of Nachi (bearings and hydraulics) with Fujikoshi (steel and cutting tools). Nachi’s cutting tools are manufactured at state-of-the-art facilities in Japan and are exported to over 40 countries. The brand is particularly renowned for its HSS and cobalt HSS end mills, drills, and taps, as well as its premium solid carbide end mill range. With 5,286 products on Hooguu, Nachi offers a focused but high-quality selection of cutting tools for precision CNC machining.
Nachi Product Lines
Turning Inserts
While Nachi is primarily known for its rotary cutting tools, the company offers a range of carbide turning inserts for precision boring and turning operations. The Nachi Turning insert line features CNMG, CCMT, and VCMT geometries in grades optimized for finishing operations. The SGS coating (Super Gold Surface) is Nachi’s proprietary TiAlN + Si coating that provides excellent heat resistance for high-speed finishing. Nachi turning inserts are particularly popular for Swiss-type lathe applications where small-format precision inserts are required.
Milling Cutters
Nachi’s milling range is the company’s strongest product category. The SG-FAX series features premium cobalt HSS (M42) end mills with steam oxide treatment for general-purpose milling in steel up to 40 HRC. The Aqua Mill series uses Nachi’s proprietary AQUA coating (a blue-colored AlCrN PVD coating) for extended tool life in hardened steel milling up to 60 HRC. The SGS Endmill family offers solid carbide end mills with variable helix geometry for chatter-free milling in aluminum, steel, and stainless steel. The Aqua EX series is designed for high-speed milling of pre-hardened mold steels, featuring unequal flute spacing and AlCrN coating for exceptional performance in die and mold machining. Nachi also offers the Roughing Endmill series with serrated cutting edges for aggressive roughing in steel and cast iron.
Drilling Tools
Nachi’s drilling portfolio includes the SG Drill series, which are premium cobalt HSS twist drills with 118-degree and 135-degree split points for self-centering. The Aqua Drill solid carbide drill range features through-coolant channels and AQUA coating for high-speed drilling in hardened materials. Nachi also produces the SG-NIB deep-hole drill series using gun-drill technology for diameters from 1 to 30 mm and depths up to 30xD. The Center Drill and Spot Drill ranges provide precision pre-drilling tools for CNC machining centers.
Grooving & Threading
Nachi’s threading tools focus on taps rather than thread turning inserts. The SG Tap series features cobalt HSS spiral-point and spiral-flute taps for machine tapping in steel and stainless steel. The Aqua Tap range uses AQUA coating for extended tap life in hardened materials and high-production tapping operations. The Nachi Thread Mill series offers solid carbide thread milling cutters as an alternative to tapping for large-diameter and difficult-to-tap materials. Nachi also offers keyway cutters, slotting cutters, and T-slot cutters for specialized grooving operations.
Nachi Grade Selection Guide
| Grade/Material | Application Range | Best For | Coating/Treatment |
|---|---|---|---|
| SG-FAX (M42 HSS-Co) | Steel up to 40 HRC | General-purpose milling and drilling | Steam oxide treatment |
| AQUA (Carbide + AlCrN) | Steel up to 60 HRC | Hardened steel milling | AQUA AlCrN PVD |
| SGS (Carbide + TiAlSiN) | Steel up to 55 HRC | High-speed finishing | SGS TiAlSiN PVD |
| Aqua EX (Carbide) | Pre-hardened mold steel | Die and mold milling | AQUA AlCrN + variable helix |
| HSS-Co (M35) | Steel up to 35 HRC | Economical general-purpose | Steam oxide / TiN |
| Carbide Uncoated | Aluminum and non-ferrous | Aluminum milling and drilling | Polished flutes |
| Carbide TiAlN | General steel and stainless | Standard CNC milling | TiAlN PVD |
Popular Nachi Products on Hooguu
Browse our selection of 5,286 Nachi cutting tools on Hooguu. From the legendary SG-FAX cobalt end mills and AQUA-coated hardened steel end mills to SG drills and SG taps, we stock the complete Nachi cutting tool range. Nachi is the go-to brand for shops requiring premium HSS and solid carbide rotary cutting tools for precision CNC machining.
Nachi vs Alternatives
| Application | Nachi Product | Kennametal (HARVI) | Mitsubishi (Smart Miracle) | Notes |
|---|---|---|---|---|
| HSS end mills | SG-FAX M42 | – | – | Nachi is the global leader in HSS end mills; no carbide brand competes here |
| Hardened steel milling | Aqua Mill | HARVI Ultra | VF-2SB Smart Miracle | Nachi AQUA coating excels on pre-hardened steels; comparable to HARVI |
| General end milling | SGS Carbide | HARVI II | VF-4MB | All three offer excellent variable-helix designs; Nachi is more economical |
| Drilling (HSS) | SG Drill | – | – | Nachi dominates HSS drilling; premium brands focus on carbide drills |
| Machine tapping | SG Tap / Aqua Tap | – | – | Nachi taps are industry-standard; few cutting tool brands match this range |
| Die and mold | Aqua EX | HARVI Ball | VF-2SB | Nachi offers excellent die/mold performance at competitive prices |
Why Buy Nachi from Hooguu
Hooguu carries 5,286 Nachi products, including the renowned SG-FAX, AQUA, and SGS cutting tool families. Nachi is the definitive brand for HSS and cobalt HSS cutting tools, and a strong contender in solid carbide end mills and drills. Japanese manufacturing quality combined with competitive pricing makes Nachi an excellent choice for precision machining applications. Shop the complete Nachi range at hooguu.com/brand/nachi/ for genuine products and worldwide shipping.
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