JTEKT-KOYO 51210 Axial Deep Groove Ball Bearing - 50 mm ID, 78 mm OD, 22 mm Width
JTEKT-KOYO box for the 51210 Axial Deep Groove Ball Bearing
    JTEKT-KOYO box for the 51210 Axial Deep Groove Ball Bearing
JTEKT-KOYO 51210 Axial Deep Groove Ball Bearing - 50 mm ID, 78 mm OD, 22 mm Width
JTEKT-KOYO box for the 51210 Axial Deep Groove Ball Bearing
JTEKT-KOYO 51210 Axial Deep Groove Ball Bearing - 50 mm ID, 78 mm OD, 22 mm Width
JTEKT-KOYO box for the 51210 Axial Deep Groove Ball Bearing
    JTEKT-KOYO box for the 51210 Axial Deep Groove Ball Bearing
JTEKT-KOYO 51210 Axial Deep Groove Ball Bearing - 50 mm ID, 78 mm OD, 22 mm Width
JTEKT-KOYO box for the 51210 Axial Deep Groove Ball Bearing

JTEKT-KOYO 51210 Axial Deep Groove Ball Bearing - 50 mm ID, 78 mm OD, 22 mm Width

  • d 50 mm
  • D 78 mm
  • B 22 mm
  • Open (None)
  • C0 - Normal
Brand: JTEKT-KOYO

Genuine JTEKT-KOYO product, JTEKT-KOYO

$112.90
$112.90
$15.82
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Bearings from Apollo Industries, Oxford, Michigan

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Overview

JTEKT-KOYO 51210 Thrust bearing

Axial Deep Groove Ball Bearing

JTEKT-KOYO axial (thrust) deep groove ball bearings are designed to support pure axial loads and consist of shaft and housing washers and a ball-and-cage assembly. Single-direction and double-direction variants are available; single-direction handles thrust in one direction only.

Key features

  • Designed for pure axial loads
  • Single and double direction variants
  • Separable washers simplify mounting
  • Suitable for moderate speeds
  • Long service life under thrust loads

Specifications

JTEKT-KOYO 51210 dimensions & specifications

Drawing of the JTEKT-KOYO 51210, bore d 50 mm, outside diameter D 78 mm, width B 22 mm B 22 mm D 78 mm d 50 mm
Drawn to scale from the catalog dimensions.
Bearing type
Thrust bearing
Bore diameter d
50 mm (1.969 in)
Outside diameter D
78 mm (3.071 in)
Width B
22 mm (0.866 in)
Seals / shields
Open (None)
Internal clearance
C0 - Normal
Weight
0.83 lb
Brand
JTEKT-KOYO
Part number
51210

All specifications

Dimensions

Bore Diameter50 mm
Outside Diameter78 mm
Width22 mm

Properties

MaterialStandard bearing steel
CageSheet steel cage
Tolerance classTolerance class P0/PN2 / ABEC 1
Temperature range-30 to +150 °C
Operating directionSingle direction bearing

Logistics

Product Net Weight0.376

Cross reference

51210 cross reference & equivalents

Bearings from other brands with the same boundary dimensions. Check seals, clearance, cage and precision class before you order.

Reference data only. Verify specifications before you order.

Search more equivalents in the Apollo Bearing Index

Tools & lubrication

Complete the job for your 51210

Mount it without damage and keep it lubricated. Tick what you need and add it with one click.

Part number decoded

What every part of 51210 means

512
512xx thrust ball, medium (dimension series 12)
10
Bore code 10 × 5 = 50 mm (ISO convention)
Decode another part number

Catalogs & documents

Koyo (JTEKT) 51210 catalogs & documents

Official catalogs and data from the manufacturer. They open as PDFs in a new tab.

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

Shop all Koyo (JTEKT)

  • 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
Koyo (JTEKT) website (opens in a new tab)

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.

Apollo USA Bearing Search Tool

Apollo USA Bearing Search Tool

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Learn More

FAQ

51210 questions & answers

What are the dimensions of the JTEKT-KOYO 51210?

The JTEKT-KOYO 51210 has a 50 mm bore (d), a 78 mm outside diameter (D) and a 22 mm width (B). In inches: 1.969 × 3.071 × 0.866 in.

What type of bearing is the 51210?

The JTEKT-KOYO 51210 is a thrust bearing.

Is the 51210 sealed or shielded?

The JTEKT-KOYO 51210 is an open bearing (Open (None)): it has no seals or shields.

What internal clearance does the 51210 have?

The JTEKT-KOYO 51210 has C0 - Normal internal clearance.

What can I use instead of the JTEKT-KOYO 51210?

Equivalents with the same boundary dimensions include SKF 51210, RHP 51210, SNR 51210, Consolidated 51210, FAG 51210. Check the seals, internal clearance, cage and precision class before you order.

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 51210 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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