KOYO DG 327618-12RJ8D 32x76x18 - Single-Row Ball Bearing

KOYO DG 327618-12RJ8D 32x76x18 - Single-Row Ball Bearing

KOYO DG 327618-12RJ8D is a special single-row ball bearing with dimensions 32x76x18 mm, manufactured by KOYO, a JTEKT brand. The DG327618 family is used primarily in automotive bearing applications and is designed to accommodate radial loads together with axial loads resulting from the operating arrangement. The unusual 32 mm bore and 76 mm outside diameter make the complete DG designation particularly important when identifying a replacement.

JTEKT's official product database confirms the 32 mm bore, 76 mm outside diameter and 18 mm width for the DG327618 family.

Technical Specifications - KOYO DG 327618-12RJ8D

Manufacturer: KOYO / JTEKT
Designation: DG327618-12RJ8D
Product family: DG327618
Product type: Ball bearing
Design: Single row
Bore diameter d: 32 mm
Outside diameter D: 76 mm
Width B: 18 mm
Dimensions: 32x76x18 mm
Rolling elements: Balls
Application group: Automotive / special-purpose bearing
Radial loads: Yes
Axial loads: Yes, depending on operating arrangement

The designation DG 327618-12RJ8D 32x76x18 is also independently listed as a KOYO ball bearing in industrial bearing catalogues.

Dimensions 32x76x18 mm

The principal dimensions are:

d: 32 mm
D: 76 mm
B: 18 mm

These non-standard dimensions are an important identification feature. A bearing should not be selected only because it has a 32 mm shaft bore. The 76 mm outside diameter, 18 mm width and complete DG327618 designation must also correspond to the original bearing.

DG327618 Special Bearing Family

KOYO uses the DG327618 designation for a family of special-purpose ball bearings.

Official JTEKT data for the closely specified DG327618-12RJ8DNSZ confirms:

Bore diameter: 32 mm
Outside diameter: 76 mm
Width: 18 mm
Basic dynamic load rating Cr: 29 kN
Basic static load rating C0r: 17.4 kN
Reference mass: 0.369 kg.

Because suffixes identify specific bearing executions, load ratings and construction details should always be verified against the exact full suffix required by the machine manufacturer.

Single-Row Ball Bearing Construction

The DG327618 family uses a single-row ball bearing arrangement. Rolling contact between the balls and raceways enables the bearing to support radial loading while also accommodating axial forces within the limits of its specific internal design.

This combination makes special single-row ball bearings useful in automotive and mechanical applications where compact dimensions, rotational accuracy and combined-load capability are required.

Automotive Bearing Application

JTEKT officially classifies the DG327618 family within its automotive bearing range. The manufacturer's database specifically lists DG327618-12RJ8DNSZ under automotive bearings - tensioner bearings.

This makes the exact bearing designation particularly important. Special automotive bearings can incorporate application-specific sealing, internal clearance, lubricant or other design characteristics that cannot be determined from dimensions alone.

Importance of the Full Suffix

When replacing DG 327618-12RJ8D, the complete suffix should be checked against the marking on the original bearing.

Variants of the DG327618 family are available with longer suffix combinations, including versions such as DG327618-12RJ8DNSZ and DG327618-12RJ8DNSHR4SH6CS40. Both retain the basic 32x76x18 mm dimensions, but the additional suffix characters identify specific executions.

Therefore, identical dimensions do not automatically guarantee identical technical specification.

Load Ratings

For the officially documented DG327618-12RJ8DNSZ version, JTEKT specifies:

Basic dynamic load rating Cr: 29 kN
Basic static load rating C0r: 17.4 kN.

These values are useful for identifying the technical family, but for engineering calculations involving the exact DG327618-12RJ8D suffix, the specification corresponding to that exact execution should be used.

Replacement Identification

When selecting a replacement, verify:

Brand: KOYO / JTEKT
Designation: DG327618-12RJ8D
Bearing family: DG327618
Bearing type: Ball bearing
Rows: Single row
Dimensions: 32x76x18 mm
Bore: 32 mm
Outside diameter: 76 mm
Width: 18 mm
Suffix: Must correspond to the required execution

A generic bearing with similar dimensions should not automatically be considered a direct replacement.

Typical Applications

The DG327618 bearing family is associated primarily with automotive applications, including tensioner bearing arrangements. Depending on the exact OEM specification, bearings from this dimensional family may be encountered in:

• belt tensioner systems
• automotive auxiliary drives
• rotating automotive assemblies
• special mechanical drive systems
• OEM machinery
• replacement and maintenance applications

The exact application should be confirmed using the machine, vehicle or OEM part number.

FAQ - KOYO DG 327618-12RJ8D

What are the dimensions of KOYO DG327618-12RJ8D?
The bearing has principal dimensions of 32x76x18 mm: 32 mm bore, 76 mm outside diameter and 18 mm width.

What type of bearing is DG 327618-12RJ8D?
It is a single-row ball bearing from the KOYO DG special bearing family.

Who manufactures DG327618-12RJ8D?
The bearing is manufactured under the KOYO brand, which belongs to JTEKT.

Is DG327618 an automotive bearing?
Yes. JTEKT classifies the documented DG327618 family within its automotive bearing range, including tensioner-bearing applications.

What is the bore diameter of DG327618?
The nominal bore diameter is 32 mm.

What is the outside diameter?
The outside diameter is 76 mm.

Can another 32x76x18 bearing replace DG327618-12RJ8D?
Not necessarily. The complete designation and suffix should be checked because bearings with identical boundary dimensions can differ in sealing, internal design, clearance or application specification.

Why should the complete KOYO suffix be retained?
KOYO offers multiple DG327618 executions with the same basic dimensions. The additional suffix identifies the specific bearing configuration required for the application.