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

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

EZO F-684ZZ is a miniature single-row flanged deep groove ball bearing with basic dimensions 4x9x2.5 mm. The F designation identifies a flange on the outer ring, while ZZ indicates metal shields on both sides. This design combines very compact dimensions with easier axial positioning in the housing and protection of the bearing interior against contaminants.

Technical data

EZO F-684ZZ dimensions

The basic bearing dimensions are:

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

Complete basic dimensional specification:

4x9x2.5 mm

These dimensions refer to the basic bearing section. Because F-684ZZ is a flanged bearing, the flange dimensions must also be considered when checking the housing or selecting a replacement.

What does F-684ZZ mean?

The designation can be interpreted as follows:

F - flanged outer ring.

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

ZZ - metal shields on both sides.

The complete F-684ZZ designation therefore identifies a flanged, double-shielded version of the miniature 684 deep groove ball bearing.

EZO F-684ZZ construction

The bearing consists of:

• inner ring,
• flanged outer ring,
• balls,
• cage,
• two metal shields.

Its 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 F flange

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

It helps to:

• position the bearing axially in the housing,
• locate the bearing relative to the mounting bore,
• simplify compact bearing arrangements,
• provide precise positioning in miniature mechanisms.

This is the principal construction difference between F-684ZZ and a standard 684ZZ bearing.

What does ZZ mean?

ZZ indicates metal shields on both sides of the bearing.

The shields help to:

• reduce the ingress of contaminants,
• protect the raceways and rolling elements,
• retain lubricant inside the bearing,
• protect the bearing interior without using 2RS-type seals.

Metal shields should not be confused with elastomer seals used in sealed bearing versions.

F-684ZZ vs 684ZZ

Both versions have the same basic bearing size, but their outer-ring designs differ.

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

684ZZ - standard outer ring without a flange, with metal shields on both sides.

They should therefore not automatically be considered interchangeable.

F-684ZZ vs F-684

Both versions feature a flanged outer ring, but they differ in closure design.

F-684ZZ - metal shields on both sides.

F-684 - open version.

The correct version should be selected according to the required protection, lubrication arrangement and operating conditions.

Compact 4x9x2.5 mm design

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

The flange facilitates axial positioning, while the ZZ shields provide additional protection for the internal rolling elements and raceways.

Selection and interchangeability

Before selecting EZO F-684ZZ, verify:

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

Matching the basic 4x9x2.5 mm dimensions alone does not confirm full interchangeability with a non-flanged bearing.

Installation

Due to its miniature dimensions, EZO F-684ZZ 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. Direct pressure on the ZZ shields should be avoided, and the flange should be protected against deformation.

Alternative designations and reference formats

• EZO F-684ZZ
• F-684ZZ EZO
• F 684 ZZ EZO
• F684ZZ EZO
• EZO F684ZZ
• F-684ZZ 4x9x2.5
• EZO F-684ZZ 4x9x2.5
• F684ZZ 4x9x2.5

FAQ - EZO F-684ZZ

What are the dimensions of EZO F-684ZZ?

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-684ZZ?

It is a miniature single-row deep groove ball bearing with a flanged outer ring and metal shields on both sides.

What does F mean in F-684ZZ?

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

What does ZZ mean?

ZZ indicates metal shields on both sides of the bearing.

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

F-684ZZ has a flange on the outer ring. Standard 684ZZ does not have this flange.

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

F-684ZZ has metal shields on both sides, while F-684 is the open version.

Can 684ZZ replace F-684ZZ?

Not automatically. The housing design and the function and dimensions of the flange must be checked before considering interchangeability.

F-684ZZ EZO - key information

EZO F-684ZZ 4x9x2.5 mm is a miniature single-row flanged deep groove ball bearing with metal shields on both sides. The outer-ring flange facilitates axial positioning in the housing, while the ZZ shields help protect the raceways and rolling elements against contaminants and retain lubricant.

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