Part number · Deep groove ball bearing
6318 Bearing – Size, Stock & Today’s Price
6318: a 90 × 190 × 43 mm deep groove ball bearing. Genuine SKF, FAG, NTN, NSK, KOYO and HCH, supplied across India with same or next-day delivery in Mumbai.
Deep groove ball bearing
- Bore (d)
- 90 mm
- Outside diameter (D)
- 190 mm
- Width (B)
- 43 mm
- Dynamic load rating (C)
- 151 kN
Available – ask for stock · Multiple brands
Prices change with brand, variant and quantity, so we quote today’s rate and reply during working hours.
The 6318 is a medium-series deep groove ball bearing with a 90 mm bore, a 190 mm outside diameter and a width of 43 mm. The 63 series is the heavy-duty choice for a given shaft: larger balls, a bigger outside diameter and more width than the 62, for higher loads and shock.
Its last two digits, 18, multiplied by 5 give the 90 mm bore. A full designation such as 6318-2RS-C3 means a 6318 with rubber seals on both sides and C3 internal clearance, the usual choice for electric motors.
Sharing the same 90 mm bore are the 6018 (90 × 140 × 24 mm), the 6218 (90 × 160 × 30 mm), the 6818 (90 × 115 × 13 mm) and the 6918 (90 × 125 × 18 mm). They all fit a 90 mm shaft, but each needs a different housing, so check the outside diameter and width before you order.
Why 6318 prices vary
- Genuine or copy: fakes sell far below the real price and fail early. We sell only genuine bearings.
- Brand and origin: each maker, and each country of manufacture, is priced differently.
- Version: sealed, shielded, C3, stainless and low-noise versions cost more than the open bearing.
- Quantity: bulk and repeat orders are priced lower.
So we quote today’s price for each brand rather than list one number. Ask for the 6318 price on WhatsApp.
6318 dimensions
| Bore (d) | 90 mm |
|---|---|
| Outside diameter (D) | 190 mm |
| Width (B) | 43 mm |
Dimensions are the ISO 15 standard size, the same in every brand and seal type.
6318 load and speed ratings
| Dynamic load rating (C) | 151 kN |
|---|---|
| Static load rating (C₀) | 108 kN |
| Reference speed | 7,500 r/min |
| Limiting speed | 4,800 r/min |
Figures for the open SKF 6318 from SKF’s online catalogue (checked 9 Oct 2026). Other brands publish slightly different ratings for the same size. Sealed (2RS) versions have a lower limiting speed. SKF data sheet.
Other bearings for a 90 mm shaft
Same bore, different series: a bigger bearing carries more load but needs a bigger housing.
| Bearing | Size (mm) | Dynamic load C |
|---|---|---|
| 6018 | 90 × 140 × 24 | 60.5 kN |
| 6218 | 90 × 160 × 30 | 101 kN |
| 6318 | 90 × 190 × 43 | 151 kN |
On a 90 mm shaft, the 6318 carries 50% more load than the slimmer 6218.
6318 variants
Every 6318 has the same outside dimensions. What changes is how it is sealed, its internal clearance and its material:
- 6318 (open): no shields or seals. For gearboxes and machines where oil or grease reaches the bearing.
- 6318 ZZ / 2Z: metal shields on both sides, greased for life. For clean, fast-running motors and fans.
- 6318 2RS: rubber seals on both sides (DDU at NSK, LLU at NTN). Better against dust and moisture.
- 6318 C3: internal clearance greater than normal, combined with any of the above (e.g. 6318-2RS-C3). The usual choice for electric motors.
- S6318 / SS6318: stainless steel for wet or corrosive conditions, usually marked with an S or SS prefix (SKF uses W). Supplied on request.
6318 equivalents by brand
Same size, written in each maker’s own style. Tap a brand to see how it numbers its bearings.
| Brand | Open | Shields | Seals | Seals + C3 |
|---|---|---|---|---|
| SKF | 6318 |
6318-2Z |
6318-2RS1 |
6318-2RS1/C3 |
| FAG | – |
– |
– |
– |
| NTN | 6318 |
6318ZZ |
6318LLU |
6318LLUC3 |
| NSK | 6318 |
6318ZZ |
6318DDU |
6318DDUC3 |
| KOYO | 6318 |
6318ZZ |
6318-2RS |
6318-2RS C3 |
| HCH | 6318 |
6318ZZ |
6318-2RS |
6318-2RS C3 |
Where the 6318 is used
- Large electric motors
- Industrial pumps and compressors
- Gearboxes and reducers
- Conveyor drives
- Machine tools
- Crushers, mixers and process plant
Brands available for 6318
Buying for a factory or workshop?
- GST invoice with every order
- One quotation for your whole list
- No minimum order
- Same or next-day delivery in Mumbai; dispatch across India
Is your 6318 genuine?
Counterfeit bearings are sold in many sizes and brands, including the 6318. Check that the marking on the ring matches the box exactly, that the brand’s own suffix style is used, and be wary of prices far below the market. How to spot a fake bearing.
Updated
Questions
6318 bearing: frequently asked
What size is a 6318 bearing?
A 6318 measures 90 mm bore × 190 mm outside diameter × 43 mm width. The size is the same in every brand and seal type.
What is the SKF, FAG or NSK equivalent of 6318 2RS C3?
SKF writes it 6318-2RS1/C3 and NSK 6318DDUC3, NTN 6318LLUC3 and KOYO 6318-2RS C3. All are the same 90 × 190 × 43 mm size with rubber seals on both sides and C3 clearance.
Can I use a 6218 instead of a 6318?
Not without changing the housing. Both have a 90 mm bore, but the 6218 is 160 mm across and 30 mm wide, against 190 × 43 mm for the 6318.
What load can a 6318 bearing carry?
SKF rates the open 6318 at a dynamic load rating (C) of 151 kN and a static load rating (C0) of 108 kN, with a limiting speed of 4,800 r/min. Other brands publish similar figures. How much load it can carry in service also depends on speed, lubrication and the life you need.
Have a part number, or just a worn-out bearing?
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