JTEKT-KOYO 51120 Axial Deep Groove Ball Bearing - 100 mm ID, 135 mm OD, 25 mm Width
JTEKT-KOYO box for the 51120 Axial Deep Groove Ball Bearing
    JTEKT-KOYO box for the 51120 Axial Deep Groove Ball Bearing
JTEKT-KOYO 51120 Axial Deep Groove Ball Bearing - 100 mm ID, 135 mm OD, 25 mm Width
JTEKT-KOYO box for the 51120 Axial Deep Groove Ball Bearing
JTEKT-KOYO 51120 Axial Deep Groove Ball Bearing - 100 mm ID, 135 mm OD, 25 mm Width
JTEKT-KOYO box for the 51120 Axial Deep Groove Ball Bearing
    JTEKT-KOYO box for the 51120 Axial Deep Groove Ball Bearing
JTEKT-KOYO 51120 Axial Deep Groove Ball Bearing - 100 mm ID, 135 mm OD, 25 mm Width
JTEKT-KOYO box for the 51120 Axial Deep Groove Ball Bearing

JTEKT-KOYO 51120 Axial Deep Groove Ball Bearing - 100 mm ID, 135 mm OD, 25 mm Width

  • d 100 mm
  • D 135 mm
  • B 25 mm
  • Open (None)
  • C0 - Normal
Brand: JTEKT-KOYO

Genuine JTEKT-KOYO product, JTEKT-KOYO

$337.74
$337.74
$47.29
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Bearings from Apollo Industries, Oxford, Michigan

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Overview

JTEKT-KOYO 51120 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 51120 dimensions & specifications

Drawing of the JTEKT-KOYO 51120, bore d 100 mm, outside diameter D 135 mm, width B 25 mm B 25 mm D 135 mm d 100 mm
Drawn to scale from the catalog dimensions.
Bearing type
Thrust bearing
Bore diameter d
100 mm (3.937 in)
Outside diameter D
135 mm (5.315 in)
Width B
25 mm (0.984 in)
Seals / shields
Open (None)
Internal clearance
C0 - Normal
Weight
2.15 lb
Brand
JTEKT-KOYO
Part number
51120

All specifications

Dimensions

Bore Diameter100 mm
Outside Diameter135 mm
Width25 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 Weight0.977

Cross reference

51120 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 51120

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 51120 means

511
511xx thrust ball, light (dimension series 11)
20
Bore code 20 × 5 = 100 mm (ISO convention)
Decode another part number

Catalogs & documents

Koyo (JTEKT) 51120 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

Stop guessing what bearing you need. The Apollo Bearing Index has 98,500+ bearings across 100+ brands — paste FAG 22215-E1-XL-K-C4 and see what every letter means, or search by PN, dimensions, or the machine the bearing lives in (Haas, Mazak, DMG MORI, Caterpillar, Vestas, and 400+ more).

Learn More

FAQ

51120 questions & answers

What are the dimensions of the JTEKT-KOYO 51120?

The JTEKT-KOYO 51120 has a 100 mm bore (d), a 135 mm outside diameter (D) and a 25 mm width (B). In inches: 3.937 × 5.315 × 0.984 in.

What type of bearing is the 51120?

The JTEKT-KOYO 51120 is a thrust bearing.

Is the 51120 sealed or shielded?

The JTEKT-KOYO 51120 is an open bearing (Open (None)): it has no seals or shields.

What internal clearance does the 51120 have?

The JTEKT-KOYO 51120 has C0 - Normal internal clearance.

What can I use instead of the JTEKT-KOYO 51120?

Equivalents with the same boundary dimensions include SKF 51120, RHP 51120, SNR 51120, Consolidated 51120, FAG 51120. 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 51120 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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