F-684 EZO 4x9x2.5 mm - Miniature Flanged Deep Groove Ball Bearing

F-684 EZO 4x9x2.5 mm - Miniature Flanged Deep Groove Ball Bearing

EZO F-684 is a miniature single-row flanged deep groove ball bearing with basic dimensions 4x9x2.5 mm. The F designation identifies a flanged outer ring, which facilitates axial positioning of the bearing in the housing. The designation F-684 without ZZ or 2RS identifies the basic open version.

Technical data

EZO F-684 dimensions

The basic bearing dimensions are:

d: 4 mm
D: 9 mm
B: 2.5 mm

Complete basic dimensional specification:

4x9x2.5 mm

Because F-684 is a flanged bearing, the flange geometry must also be considered when designing or checking the housing. The 4x9x2.5 mm dimensions describe the basic bearing envelope and do not represent all flange dimensions.

What does F-684 mean?

F - flanged outer ring.

684 - miniature deep groove ball bearing size with basic dimensions 4x9x2.5 mm.

The absence of ZZ or 2RS identifies the basic open version.

The complete F-684 designation is important because the flange distinguishes this bearing from a standard 684 bearing without a flange.

EZO F-684 construction

EZO F-684 is a miniature single-row deep groove ball bearing consisting of:

• inner ring,
• flanged outer ring,
• balls,
• cage,
• open bearing construction.

The deep raceway geometry is primarily designed to accommodate radial loads. As a deep groove ball bearing, it can also accommodate axial loads within the operating limits of the specific bearing arrangement.

Function of the flange

The flange is integrated into the outer ring and provides an axial locating surface.

Its principal functions include:

• facilitating axial positioning,
• locating the bearing relative to the housing,
• simplifying installation in compact components,
• helping control the bearing position within the mounting bore.

This feature is particularly useful in miniature assemblies where incorporating a separate locating shoulder into the housing may be difficult.

F-684 vs 684

The basic bearing dimensions are 4x9x2.5 mm, but the outer-ring design differs.

F-684 - flanged outer ring.

684 - standard version without a flange.

For this reason, F-684 and 684 should not automatically be considered interchangeable even when their basic bearing dimensions correspond.

F-684 vs F-684ZZ

The difference is the bearing closure.

F-684 - open version.

F-684ZZ - flanged version with metal shields on both sides.

Selection should consider the operating environment, lubrication arrangement and required level of protection against contaminants.

Miniature 4x9x2.5 mm design

With a 4 mm bore, 9 mm basic outside diameter and only 2.5 mm width, F-684 provides an extremely compact bearing arrangement.

The flange additionally simplifies axial location, making this design particularly useful where installation space is limited.

Selection and interchangeability

Before selecting EZO F-684, verify:

• complete F-684 designation,
• 4 mm bore,
• 9 mm basic outside diameter,
• 2.5 mm width,
• flanged outer-ring design,
• required flange dimensions,
• open bearing configuration,
• required operating conditions,
• shaft and housing fits.

A bearing should not be selected solely because its basic dimensions are 4x9x2.5 mm. The presence and geometry of the flange can be critical for correct installation.

Installation

Due to its miniature dimensions, F-684 should be handled carefully during installation.

When fitting the bearing onto a shaft, mounting force should be applied to the inner ring. When installing it into a housing, force should be applied to the outer ring.

Mounting force should not be transmitted through the balls. The flange should also be protected against deformation or mechanical damage.

Alternative designations and reference formats

• EZO F-684
• F-684 EZO
• F684 EZO
• EZO F684
• F-684 4x9x2.5
• EZO F-684 4x9x2.5
• F684 4x9x2.5
• 684 flanged bearing 4x9x2.5

FAQ - EZO F-684

What are the dimensions of EZO F-684?

The basic bearing dimensions are 4x9x2.5 mm, with a 4 mm bore, 9 mm outside diameter and 2.5 mm width.

What type of bearing is F-684?

It is a miniature single-row deep groove ball bearing with a flanged outer ring.

What does F mean in F-684?

F identifies the flanged version. The flange is located on the outer ring and facilitates axial positioning.

Is EZO F-684 an open bearing?

Yes. F-684 without an additional ZZ or 2RS suffix is the open version.

What is the difference between F-684 and 684?

F-684 has a flange on the outer ring, while the standard 684 version does not.

What is the difference between F-684 and F-684ZZ?

Both are flanged bearings, but F-684 is open, while F-684ZZ features metal shields on both sides.

Can any 4x9x2.5 mm bearing replace EZO F-684?

No. In addition to the basic dimensions, the flange design and dimensions, closure configuration and operating requirements must be verified.

F-684 EZO - key information

EZO F-684 is a miniature single-row flanged deep groove ball bearing with basic dimensions 4x9x2.5 mm. The flange on the outer ring facilitates axial positioning in the housing. F-684 is the open version and should be distinguished from shielded variants such as F-684ZZ.

Available from simmering.pl, a specialist supplier of bearings and industrial components. Stock in Poland with worldwide shipping.