JTEKT-KOYO UC210-31 Radial Insert Ball Bearing - 49.213 mm ID, 90 mm OD, 51.6 mm Width
- d 49.213 mm
- D 90 mm
- B 51.6 mm
- Open (None)
- C0 - Normal
Genuine JTEKT-KOYO product, JTEKT-KOYO
- Regular price
- $165.83
- Sale price
- $165.83
- Regular price
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$16.58
Same-day shipping
Order by 3 PM ET for same-day shipping
Free shipping on orders over $100
Use code at checkout.
JTEKT-KOYO UC210-31
$165.83
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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Free shipping over $100
All orders over $100 ship free by ground with code FREESHIP.
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90-day returns
Hassle-free returns on unused items within 90 days.
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Price match
Show us a competitor's advertised price on the same item and we will match it.
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Expert support
Support staff available by phone, web chat or email.
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Need tax exemption or quantity pricing?
We offer special rates for businesses and bulk orders.
Talk to a bearing specialist
2695 Lake George RdOxford, MI 48370
Overview
JTEKT-KOYO UC210-31 Insert bearing
Radial Insert Ball Bearing
JTEKT-KOYO radial insert ball bearings (Y-bearings) are deep groove ball bearings with extended inner rings, convex outer surfaces, and integrated seals. They are designed to be mounted in housings to form bearing units and allow some initial misalignment.
Key features
- Extended inner ring with locking options
- Convex outer ring for self-alignment
- Integrated sealing on both sides
- Designed for pillow blocks and flange units
- Easy to install and replace
Specifications
JTEKT-KOYO UC210-31 dimensions & specifications
- Bearing type
- Insert bearing
- Bore diameter d
- 49.213 mm (1.938 in)
- Outside diameter D
- 90 mm (3.543 in)
- Width B
- 51.6 mm (2.031 in)
- Seals / shields
- Open (None)
- Internal clearance
- C0 - Normal
- Weight
- 1.81 lb
- Brand
- JTEKT-KOYO
- Part number
- UC210-31 also written UC21031
All specifications
Dimensions
| Bore Diameter | 49.213 mm |
| Outside Diameter | 90 mm |
| Width | 51.6 mm |
Properties
| Material | Standard bearing steel |
| Cage | Sheet steel cage |
| Seal | Contact seal on both sides |
| Bore | Cylindrical bore |
| Outer ring | Spherical |
| Inner ring | Widened inner ring on both sides |
| Tolerance class | Tolerance class P0/PN2 / ABEC 1 |
| Temperature range | -20 to +120 °C |
| Lubrication | With lubrication hole(s) |
| Fixing | Threaded pins |
Logistics
| Product Net Weight | 0.82 |
Tools & lubrication
Complete the job for your UC210-31
Mount it without damage and keep it lubricated. Tick what you need and add it with one click.
Catalogs & documents
Koyo (JTEKT) UC210-31 catalogs & documents
Official catalogs and data from the manufacturer. They open as PDFs in a new tab.
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Catalog
JTEKT Ball & Roller Bearings: Specification tables (BS004EN-2DS) (opens in a new tab)
PDF · 5.3 MB · English
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Technical
JTEKT Ball & Roller Bearings: Technical section (BS004EN-2DS) (opens in a new tab)
PDF · 2.4 MB · English
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Catalog
JTEKT Needle Roller Bearings (BS007EN-1DS) (opens in a new tab)
PDF · 18.7 MB · English
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Catalog
JTEKT Insert Bearing Units (BS006EN-0DS-A) (opens in a new tab)
PDF · 7.2 MB · English
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Catalog
JTEKT Inch Series Tapered Roller Bearings (BS001EN-0DS-A) (opens in a new tab)
PDF · 3.2 MB · English
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Guide
JTEKT Ball & Roller Bearings: Failures, Causes and Countermeasures (WS001EN-0DS) (opens in a new tab)
PDF · 5.8 MB · English
About the brand
About Koyo (JTEKT)
Koyo, the JTEKT bearing brand, since 1921.
Zenichiro Ikeda founded Koyo Seiko in Osaka in 1921 as a private store that sold imported bearings, and it soon began making its own; in 1927 it commercialized Japan's first tapered roller bearing. In 2006 Koyo Seiko and machine tool maker Toyoda Machine Works merged to form JTEKT Corporation, headquartered in Kariya, Aichi, Japan.
Koyo introduced its HI-CAP tapered roller bearing in 1968 and launched the world's first ceramic bearings in 1984.
Since April 2022 Koyo bearings carry the JTEKT name: the same company, factories and products under one name, JTEKT says. Boxes may read "JTEKT, formerly sold as Koyo", and bearings in new boxes may still be stamped Koyo. From September 2026 new boxes read "Koyo, JTEKT Bearing Brand", and old and new boxes will be on the market together for a while.
Genuine Koyo (JTEKT) product
Founded
1921
Headquarters
Kariya, Aichi, Japan (JTEKT)
Employees (March 2026)
43,233
Sales (year to March 2026)
¥1.92 trillion
Known for
- Tapered roller bearings (HI-CAP, low-torque LFT)
- Needle roller bearings
- Ceramic bearings
- Insert bearing units
Disclaimer: Apollo Industries is not an authorized distributor, reseller, or representative of Koyo (JTEKT). All Koyo (JTEKT) trademarks and product names are the property of their respective owners. We sell genuine Koyo (JTEKT) products purchased through independent channels.
FAQ
UC210-31 questions & answers
What are the dimensions of the JTEKT-KOYO UC210-31?
The JTEKT-KOYO UC210-31 has a 49.213 mm bore (d), a 90 mm outside diameter (D) and a 51.6 mm width (B). In inches: 1.938 × 3.543 × 2.031 in.
What type of bearing is the UC210-31?
The JTEKT-KOYO UC210-31 is an insert bearing.
Is the UC210-31 sealed or shielded?
The JTEKT-KOYO UC210-31 is an open bearing (Open (None)): it has no seals or shields.
What internal clearance does the UC210-31 have?
The JTEKT-KOYO UC210-31 has C0 - Normal internal clearance.
Is this a genuine JTEKT-KOYO bearing?
Yes. Apollo Industries sells genuine JTEKT-KOYO products, purchased through independent channels. Apollo is not an authorized distributor, reseller, or representative of JTEKT-KOYO.
Do you ship the UC210-31 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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