Deep Groove Bearings

Deep Groove Ball Bearings — 6000, 6200 & 6300 Series

Deep groove ball bearings are the most universally used bearing type — versatile, compact, suitable for high speed with moderate radial and axial load capability. AIMS Industrial stocks deep groove ball bearings from NACHI, Koyo, NSK and NTN — 6000 (extra-light), 6200 (light) and 6300 (medium) series in open, 2Z (shielded) and 2RS (sealed) variants across the most common industrial bore sizes. Manufactured to AS 2729 / ISO 15 dimensional standards.

For complete coverage of selection, installation, lubrication and failure diagnosis, see our deep groove ball bearing guide.

Deep groove bearings we stock

6000 series (extra-light, 10–30 mm bore) — for small motors, power tools and instrumentation, providing a compact, lightweight bearing with high speed capability in a small envelope. NACHI and Koyo 6000 series are stocked in open and 2RS sealed variants.

6200 series (light, 10–110 mm bore) — the most widely stocked metric ball bearing series, covering the most common bore sizes for electric motors (IEC frame sizes), centrifugal pumps, conveyors and general industrial equipment. NACHI and Koyo 6200 series bearings are the benchmark for motor and pump maintenance replacement across Australian industry.

6300 series (medium, 10–115 mm bore) — wider and heavier than 6200 in the same bore, providing higher radial load capacity. Used where 6200 life rating is insufficient for the application load.

NSK & NTN deep groove ball bearings — available across selected 6200 series sizes for direct-replacement applications where the OEM bearing specification is NSK or NTN. Both brands meet the same ISO dimensional and tolerance standards as NACHI and Koyo.

Deep groove bearing selection

Matching bearing to motor frame — IEC-frame electric motor bearing sizes are standardised. Confirm the frame size and bearing position (DE/NDE) from the motor nameplate to identify the correct replacement bearing. NACHI and Koyo cross-reference tables map IEC motor frames to the required bearing series and sizes — see also our bearing cross-reference guide for cross-brand equivalents.

Sealed (2RS) vs shielded (2Z) vs open — most modern electric motors use 2RS rubber-sealed bearings, pre-packed with grease for the design service life. Shielded 2Z bearings are used in older motors with grease-nipple relubrication. Open bearings are used where the bearing housing provides separate sealing or where relubrication is via the housing. Confirm the original bearing designation before replacement — substituting sealed for open removes the relubrication path and shortens bearing life.

Internal clearance (CN vs C3) — electric motors with interference-fit outer rings require C3 (larger than normal) internal clearance. The press fit reduces internal clearance to the design operating value during assembly. Using CN (normal) clearance bearings in press-fit applications results in over-tight running clearance and reduced bearing life. Most motor manufacturers specify C3 — check the nameplate.

Installation, maintenance & removal

For bearing installation, alignment and lubrication best practice, see our bearing maintenance guide. For removing a stuck bearing from a shaft or housing, the bearing puller guide walks through the puller types and sizing.

Companion bearing ranges at AIMS

Deep groove bearings sit within our broader bearings range. For other bearing types: needle roller bearings, tapered roller bearings, spherical roller bearings, cylindrical roller bearings, angular contact bearings, self-aligning bearings, thrust bearings and bearing housings. For pillow block and flange units, the housings range catalogues the complete assemblies.

As a proudly Australian business since 1988, we stock locally and work with trusted distributors for fast, reliable supply. Need help sizing or specifying a deep groove bearing for your application? Call (02) 9773 0122, contact our team or request a quote.