NACHI Bearing Series — Quick Reference
NACHI (Fujikoshi Corporation, Japan) bearings follow ISO 15 / ISO 355 / AS 2729 dimensional standards — fully interchangeable with SKF, NSK, NTN, FAG and Koyo equivalents. NACHI's integrated manufacturing (bearings + machine tools + cutting tools + robots) underpins the consistent quality reputation. The matching across major manufacturers means a NACHI 6205-2NSE drops straight into a position previously filled by an SKF, NSK or Koyo equivalent.
| Bearing Type | NACHI Series | Common Use |
|---|---|---|
| Deep Groove Ball | 6000, 6200, 6300, 6800, 6900 | Electric motors, pumps, fans — most common bearing type |
| Cylindrical Roller | NJ, NU, N, NF | Heavy radial load, gearboxes, motor end-bells, machine spindles |
| Tapered Roller (Metric) | 30200, 30300, 32000, 33000 | Combined radial + thrust — wheel hubs, gearboxes, axles |
| Tapered Roller (Inch) | L, LM, JM, M, HM series | Inch-dimensioned equipment — American/British origin machinery |
| Spherical Roller | 22000, 22200, 22300, 23000 | Mining, paper mills, heavy industrial — self-aligning + high load |
| Spherical Thrust Roller | 29300, 29400 | Vertical-shaft thrust loading — pumps, mixers, gearboxes |
| Angular Contact Ball | 7000, 7200, 7300 | High-speed spindles, machine tool spindles, pump shafts |
| Needle Roller | NA, RNA, NK, RNAO | Compact radial bearing — gearboxes, universal joints, automotive |
NACHI seal variants: 2NSE (contact rubber seal both sides), ZZ (metal shield both sides), C3 (radial clearance for thermal expansion), N (snap-ring groove). For complete bearing selection across all NACHI bearing types, see the matching brand collections — SKF, NSK, NTN, Koyo all carry equivalent series. For cross-referencing, see our bearing cross-reference guide.
NACHI Bearings
NACHI is a Japanese precision engineering manufacturer founded in 1928 as part of the Fujikoshi Corporation. NACHI produces bearings alongside machine tools, hydraulic equipment, cutting tools and industrial robots — an integrated manufacturing capability that directly underpins the quality and consistency of their bearing products. Boundary dimensions follow ISO 15, ISO 355 and AS 2729 across the catalogue.
Browse NACHI at AIMS by type:
- Deep groove ball bearings — 6000, 6200, 6300 series, 2NSE sealed, C3, snap-ring
- Cylindrical roller bearings — NJ configuration for gearboxes & motors
- Tapered roller bearings — metric and inch series
- Spherical roller bearings — 22300 series, straight and tapered bore
- Spherical thrust roller bearings — 29300, 29400 for vertical shafts
- Angular contact bearings — 40° single-row
NACHI Bearing Range at AIMS Industrial
AIMS Industrial stocks 166 NACHI bearings across a comprehensive range of types and series. Deep groove ball bearings form the largest part of the range, covering the 6000, 6200 and 6300 series in open, metal-shielded and rubber-sealed (2NSE) configurations, with and without C3 internal clearance, including snap ring groove variants. Angular contact ball bearings (40° contact angle, single row) are available for combined load applications.
NACHI cylindrical roller bearings in the NJ configuration provide high radial load capacity for gearbox and motor applications. Tapered roller bearings cover metric and inch series. Spherical roller bearings are stocked in the 22300 series in both straight-bore (EXQW33) and tapered-bore configurations. Spherical thrust roller bearings (29300, 29400 series) handle heavy axial loads in vertical shaft applications.
Why NACHI
NACHI bearings are manufactured to tight dimensional tolerances with consistent surface finish quality across production batches. As an integrated manufacturer, NACHI controls the steel, heat treatment and machining processes in-house — giving traceability and consistency that matters in critical replacement and OEM applications. Mining, manufacturing and agricultural maintenance teams across Australia specify NACHI where bearing failure carries significant downtime cost.
Bearing Selection & Maintenance
If you're replacing an existing bearing and need to confirm the equivalent, our bearing cross-reference guide covers the standard codes used across NACHI and other major brands. For installation, alignment and failure diagnosis, see the bearing maintenance guide. Type-specific guides: deep groove ball bearings and thrust bearings. When removing a stuck bearing, the bearing puller guide walks through the options.
To discuss NACHI requirements or check on a specific part number, call (02) 9773 0122 or contact our team.
People Also Ask — NACHI Bearings and Cutting Tools
Q: What is NACHI and what's their flagship product?
NACHI-Fujikoshi is a Japanese industrial manufacturer producing bearings, hydraulics, robotics, and cutting tools. In the AIMS context, NACHI's bearing range is the most-stocked — deep groove ball bearings, angular contact, tapered roller, spherical roller, needle roller, and specialty bearings for industrial machinery. NACHI is positioned as a premium Japanese bearing brand alongside NSK, Koyo, NTN, and SKF — all of which have similar quality and price points.
Q: NACHI vs NSK vs Koyo vs SKF — how do I choose?
All four are premium bearing brands with broadly equivalent quality and life expectancy. NACHI: strong in cutting tools as well — often specified by Japanese-origin equipment. NSK: largest Japanese bearing maker, broadest catalogue. Koyo (part of JTEKT): strong automotive heritage. SKF: Swedish, global leader, premium positioning. For replacement bearings, match the brand stamped on the existing bearing if possible. For new specifications, all four interchange dimensionally — choice often comes down to availability and price.
Q: How do I read a NACHI bearing number?
NACHI bearings use the ISO bearing-numbering system: prefix indicates type (6 = deep groove ball, 7 = angular contact, NJ = cylindrical roller, NA = needle, etc.), then bore code (e.g. '04' = 20mm, '05' = 25mm, '08' = 40mm). Suffixes indicate cage type, clearance class, seal/shield. Example: 6204 ZZ = deep groove ball, 20mm bore, double-shielded. NACHI-specific suffixes are listed in their catalogue. See our [Bearing Cross-Reference Guide](/blogs/product-guides/bearing-cross-reference-guide) for number decoding.
Q: What's NACHI's cutting tool range?
NACHI manufactures HSS and carbide drills (including the well-regarded EX Cup gold-series drills), taps, end mills, and milling cutters. The cutting tool side is less visible in Australia than the bearing range, but NACHI tooling is well-respected — particularly for production drilling applications. AIMS stocks selected NACHI cutting tools alongside Sutton, Bordo, and P&N as alternative-brand options. For Japanese-equipment-replacement tooling, NACHI is sometimes the OEM-specified choice.
Q: Are NACHI bearings counterfeited?
Yes — premium bearing brands including NACHI, NSK, SKF, and Koyo are heavily counterfeited in cheap online supply channels. Counterfeit bearings look identical to genuine but fail at 10-30% of rated life. Buy through authorised distributors — AIMS sources NACHI direct from authorised channels and can verify supply chain on request. For mission-critical applications, request batch traceability. If a deal seems too good (50%+ below market), it almost certainly isn't genuine.