Model datasheet
6318-ZZ Deep Groove Ball Bearing 90x190x43mm
Confirm the model number, dimensions, suffix, and replacement notes before sending a quotation request for repair or MRO sourcing.
Verified directory reference: Specifications have been reviewed, but the complete suffix and current order requirement must still be confirmed before purchase.
6318-ZZ bearing specifications
| Parameter | Value |
|---|---|
| Model | 6318-ZZ |
| Category | Deep Groove Ball Bearing |
| Series | 6300 Series |
| Inner Diameter (ID) | 90 mm |
| Outer Diameter (OD) | 190 mm |
| Width | 43 mm |
| Material | Chrome Steel GCr15 |
| Closure | Metal Shielded (ZZ) |
| Dynamic Load | 143 kN |
| Static Load | 107 kN |
| Speed Limit | 4000 RPM |
| Precision | P0 (ABEC-1) |
| Clearance | CN (Standard) |
6318-ZZ brand designation references
Interchange Numbers: 6318Z · 6318ZZS
Catalogue designations reviewed for this model include SKF 6318-2Z, FAG 6318-2ZR, NSK 6318ZZ, NTN 6318ZZ, Timken 318ZZ.
These catalogue references have source records, but the complete suffix and operating requirement must still be confirmed.
| Brand | Brand designation | Reference status |
|---|---|---|
| SKF | 6318-2Z | Source recorded SKF rolling bearing catalogue — 6318-2Z · |
| FAG | 6318-2ZR | Source recorded Schaeffler FAG rolling bearing catalogue — 6318-2ZR · |
| NSK | 6318ZZ | Source recorded NSK rolling bearing catalogue — 6318ZZ · |
| NTN | 6318ZZ | Source recorded NTN rolling bearing catalogue — 6318ZZ · |
| Timken | 318ZZ | Source recorded Timken bearing catalogue — 318ZZ · |
Frequently asked questions about 6318-ZZ
What does the open design mean on a 6318-ZZ bearing?
The 6318-ZZ (90mm x 190mm x 43mm) is supplied open — without seals or shields — so lubrication and relubrication come from the surrounding housing or an external system. Compare seal types before deciding on the replacement.
Which part numbers are equivalent to 6318-ZZ?
Equivalent designations include 6318-2Z, 6318-2ZR, 6318ZZ, 318ZZ, 6318Z, 6318ZZS . These are brand-specific numbers for the same ISO boundary dimensions as the 6318-ZZ (90mm x 190mm x 43mm). The basic number matching does not confirm the complete specification — compare seal type, clearance, precision, cage, and lubrication suffix before ordering.
Does the 6318-ZZ come with C3 clearance?
This directory lists the 6318-ZZ with CN (Standard). C3 (increased internal clearance) versions are common for higher operating temperatures, higher speeds, or press-fit arrangements — specify the required clearance on your RFQ so the quotation matches the application. Read the clearance guide.
The 6318-ZZ is listed as a 90×190×43mm deep groove ball bearing in double metal shielded configuration. Part of the 6300 series, the directory records chrome steel gcr15 and P0 (ABEC-1) precision grade for RFQ verification.
The 6318-ZZ bearing cross-references to SKF 6318-2Z, FAG 6318-2ZR, NSK 6318ZZ and NTN 6318ZZ. This means you can replace an SKF equivalent, FAG alternative, NSK cross reference, or NTN interchange part with the same ISO boundary dimensions. Compare the full specification table and designation suffixes before ordering, especially the seal type (2RS vs ZZ) and internal clearance (C3 vs CN).
About the 6300 Series
The 6300 series is a medium duty deep groove ball bearing with higher load ratings than the 6200 series. With a thicker cross-section (larger OD and width for the same bore), these bearings handle heavier radial loads and are commonly found in larger motor frames and industrial gearboxes.
Common Applications
- Heavy Machinery
- Mining Equipment
- Steel Mills
- Industrial Gearboxes
Common applications for 6318-ZZ
The 6318-ZZ is a common replacement candidate in the following equipment. Open the application guide to confirm the checks that apply to your machine before ordering:
Compare 6318-ZZ with nearby sizes
These models are the closest sizes in the same bearing family. They are not interchangeable — confirm the bore, outside diameter, and width before replacing the existing part.
| Model | Dimensions | Closure | Action |
|---|---|---|---|
| 6217-ZZ | 85mm x 150mm x 28mm | Metal Shielded (ZZ) | View specifications |
| 6317-ZZ | 85mm x 180mm x 41mm | Metal Shielded (ZZ) | View specifications |
| 6018-ZZ | 90mm x 140mm x 24mm | Metal Shielded (ZZ) | View specifications |
| 6218-ZZ | 90mm x 160mm x 30mm | Metal Shielded (ZZ) | View specifications |
| 6019-ZZ | 95mm x 145mm x 24mm | Metal Shielded (ZZ) | View specifications |
Fast bearing RFQ
Tell us what bearing you need.
A model number is enough to start. If the marking is unclear, send the dimensions, application, or a shared photo link in the message.
- Small repair quantities and mixed model lists
- Model, suffix, and replacement review
- Price, lead time, packing, and shipping details