Nachi 6840 C3MY Deep Groove Ball Bearing - 200 mm ID, 250 mm OD, 24 mm Width, C3
- d 200 mm
- D 250 mm
- B 24 mm
- C3 - Loose
Genuine Nachi product, Nachi
- Regular price
- $2,462.16
- Sale price
- $2,462.16
- Regular price
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Same-day shipping
Order by 3 PM ET for same-day shipping
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Nachi 6840 C3MY
$2,462.16
Why Apollo USA
Bearings from Apollo Industries, Oxford, Michigan
Apollo Industries supplies bearings, seals and maintenance tools to businesses across the US, with real people on the phone when you need a part matched.
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Same-day shipping
Order by 3 PM EST for same-day shipping.
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All orders over $100 ship free by ground with code FREESHIP.
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2695 Lake George RdOxford, MI 48370
Overview
Nachi 6840 C3MY Deep groove ball bearing
Deep Groove Ball Bearing, open design with brass cage and increased clearance for high temperature
The Nachi 6840 C3MY is a very large open deep groove ball bearing measuring 200 mm bore, 250 mm outside diameter and 24 mm width, with a machined brass cage and C3 clearance. This is a high-temperature build: the brass cage and special heat treatment take the bearing to +300 degrees C, far beyond a standard sheet steel assembly, for kiln cars, furnace fans and drying equipment. C3 clearance is essential at those temperatures to keep the ball set from binding as the inner ring expands.
Key features
- Rated to +300 degrees C for furnace and kiln duty
- Machined brass cage
- Increased C3 clearance for large thermal expansion
- Open design for high-temperature lubricants
- Suits drying ovens, kiln cars and furnace fans
- Operating range -40 to +300 degrees C
Specifications
Nachi 6840 C3MY dimensions & specifications
- Bearing type
- Deep groove ball bearing
- Bore diameter d
- 200 mm (7.874 in)
- Outside diameter D
- 250 mm (9.843 in)
- Width B
- 24 mm (0.945 in)
- Internal clearance
- C3 - Loose
- Weight
- 5.95 lb
- Brand
- Nachi
- Part number
- 6840 C3MY also written 6840C3MY
All specifications
Dimensions
| Bore Diameter | 200 mm |
| Outside Diameter | 250 mm |
| Width | 24 mm |
Properties
| Ball rows | Single row bearing |
| Bore | Cylindrical bore |
| Cage | Brass cage |
| Clearance | Slightly increased radial clearance |
| Current insulation | No current insulation |
| Material | Standard bearing steel |
| Material of rolling elements | Standard bearing steel |
| Outer ring | Without flange/groove |
| Seal | None, open bearing |
| Temperature range | -40 to +300 °C |
| Tolerance class | Tolerance class P0/PN2 / ABEC 1 |
Logistics
| Product Net Weight | 2.7 |
Cross reference
6840 C3MY cross reference & equivalents
Bearings from other brands with the same boundary dimensions. Check seals, clearance, cage and precision class before you order.
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SKF
6840/C3
Same size, C3 clearance
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FAG
6840-C3
Same size, C3 clearance
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NSK
6840C3
Same size, C3 clearance
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NTN
6840C3
Same size, C3 clearance
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Timken
6840-C3
Same size, C3 clearance
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Koyo
6840C3
Same size, C3 clearance
Reference data only. Verify specifications before you order.
Search more equivalents in the Apollo Bearing IndexTools & lubrication
Complete the job for your 6840 C3MY
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Part number decoded
What every part of 6840 C3MY means
- 68
- 68xx extra-thin section deep groove ball (dimension series 18)
- 40
- Bore code 40 × 5 = 200 mm (ISO convention)
- C3
- Radial internal clearance greater than normal (CN)
- MY
- Machined bronze cage
Catalogs & documents
Nachi 6840 C3MY catalogs & documents
Official catalogs and data from the manufacturer. They open as PDFs in a new tab.
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Catalog
Nachi Ball & Roller Bearings (B2100E-4) (opens in a new tab)
PDF · English
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Catalog
Nachi Deep-groove Ball Bearings, QUEST (B3402E-2) (opens in a new tab)
PDF · English
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Catalog
Nachi Spherical Roller Bearings (B1032E-5) (opens in a new tab)
PDF · English
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Catalog
Nachi Radial Ball Bearings (B4031E-2) (opens in a new tab)
PDF · English
About the brand
About Nachi
Nachi-Fujikoshi, founded in Toyama, Japan, in 1928.
Nachi-Fujikoshi was founded on 21 December 1928 in Toyama City, Japan, as Fujikoshi Steel Industry. It makes bearings alongside cutting tools, hydraulics, robots and specialty steel. Its North American headquarters is in Greenwood, Indiana.
Genuine Nachi product
Founded
1928
Headquarters
Toyama, Japan
Known for
- Deep groove ball bearings (QUEST)
- Spherical roller bearings
- Precision bearings
- Ball screw support bearings
Disclaimer: Apollo Industries is not an authorized distributor, reseller, or representative of Nachi. All Nachi trademarks and product names are the property of their respective owners. We sell genuine Nachi products purchased through independent channels.
FAQ
6840 C3MY questions & answers
What are the dimensions of the Nachi 6840 C3MY?
The Nachi 6840 C3MY has a 200 mm bore (d), a 250 mm outside diameter (D) and a 24 mm width (B). In inches: 7.874 × 9.843 × 0.945 in.
What type of bearing is the 6840 C3MY?
The Nachi 6840 C3MY is a deep groove ball bearing.
What internal clearance does the 6840 C3MY have?
The Nachi 6840 C3MY has C3 - Loose internal clearance.
What can I use instead of the Nachi 6840 C3MY?
Equivalents with the same boundary dimensions include SKF 6840/C3, FAG 6840-C3, NSK 6840C3, NTN 6840C3. Check the seals, internal clearance, cage and precision class before you order.
Is this a genuine Nachi bearing?
Yes. Apollo Industries sells genuine Nachi products, purchased through independent channels. Apollo is not an authorized distributor, reseller, or representative of Nachi.
Do you ship the 6840 C3MY the same day?
In-stock orders placed by 3 PM EST ship the same day. All orders over $100 ship free by ground with code FREESHIP.
Can I get quantity pricing or buy tax-exempt?
Yes. Apollo offers special rates for businesses and bulk orders. Use Request a quote on this page or call (248) 429-9073.
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