Inch-Size Miniature Ball Bearing

R4-ZZ Stainless Steel Miniature Ball Bearing | 1/4" × 5/8" × 0.196" | In Stock

1/4" Bore × 5/8" OD × 0.196" Width · Stainless Steel · Double Metal Shielded · In Stock · Compatibility Verification Available

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Send us your part number, dimensions, photo, or sample — we'll help confirm the correct replacement before you order.

When You Need This Bearing, You're Usually Confirming a Fit

The R4-ZZ is an inch-size miniature ball bearing designed for equipment using imperial dimensions.

When replacing a small bearing, matching the bore is only the first step. The 1/4" bore, 5/8" outside diameter, 0.196" width, shielding arrangement, and material all need to match the original application.

If you're replacing an existing R4-ZZ or another inch-size miniature bearing, we recommend confirming the complete specification before ordering.

Technical Specifications

The 1/4" × 5/8" × 0.196" dimensions are commonly listed for R4-ZZ inch-size miniature bearings.

What This Bearing Is

The R4-ZZ is an inch-size miniature deep groove ball bearing with a 1/4" bore, 5/8" outside diameter, and 0.196" width.

The ZZ designation indicates double metal shields. These shields help retain the internal lubricant and reduce the entry of light external contaminants.

This EKB version uses stainless steel construction, making it suitable for applications where corrosion resistance is an important consideration.

The R4-ZZ is the unflanged version. For applications that require a flange for housing location, see our SFR4-ZZ Flanged Stainless Steel Ball Bearing.

Where This Bearing Is Used

The R4-ZZ can be considered for applications such as:

• Small motors and electrical equipment

• Fishing reels and sporting equipment

• RC and hobby equipment

• Small power tools and compact mechanisms

• Industrial instruments

• Equipment designed around inch-size miniature bearings

Actual suitability depends on load, speed, temperature, environment, and the specific bearing configuration required by the equipment.

Need to Match an Existing R4-ZZ Bearing?

This is where many miniature bearing replacement orders go wrong.

A 1/4" bore alone does not confirm compatibility.

Before ordering, check:
Bore → Outer Diameter → Width → Shield / Seal → Material → Application

For replacement applications, also confirm whether the original bearing is:
Flanged or unflanged

The R4-ZZ is the unflanged version.

Send us any of the following:

• Existing bearing number

• Bore, OD, and width

• Bearing photo

• Drawing

• Physical sample

• Equipment model

We'll check the dimensions and configuration before shipment.

Don't have all the information? Send us whatever you have.
A photo, partial dimensions, or the original bearing number may be enough for us to start the identification.

R4-ZZ vs. SFR4-ZZ

R4-ZZ and SFR4-ZZ are different products. The main structural difference is the flange.

Do not choose between them by dimensions alone.

If the housing is designed to accept a flange, the SFR4-ZZ may be the appropriate configuration. If no flange is required, R4-ZZ is the unflanged option.

Looking for the flanged version? See our SFR4-ZZ Flanged Stainless Steel Ball Bearing.

Why Buy From EKB?

For small inch-size bearings, the dimensions may look simple, but an incorrect shield type, material, or flange configuration can still result in the wrong replacement.

EKB helps customers check:
Dimensions → Configuration → Application → Availability
so you don't have to rely on the bore size or part number alone.

About EKB

EKB Bearing (Hebei Shuanghejincheng Bearing Co., Ltd.) operates an 18,000 m² factory with 13 automated production lines and 42 high-precision testing units, with products exported to 66 countries.

We support customers with difficult-to-source bearing requirements, including inch-size, miniature, special-dimension, and replacement bearings.

Frequently Asked Questions

What are the dimensions of R4-ZZ?
The R4-ZZ dimensions are: 1/4" bore × 5/8" outside diameter × 0.196" width
or approximately: 6.35 × 15.875 × 4.978 mm.

What does ZZ mean on R4-ZZ?
ZZ indicates double metal shields. These shields help retain the internal lubricant and reduce the entry of light external contaminants.

Is R4-ZZ stainless steel?
This EKB version is supplied as a stainless steel R4-ZZ.
R4-ZZ bearings are also available in other materials, so the material should be confirmed when replacing an existing bearing.

What is the difference between R4-ZZ and SFR4-ZZ?
R4-ZZ is unflanged, while SFR4-ZZ has a flange.
The basic bore, outside diameter, and width may be the same, but the housing configuration is different.

Can I replace another 1/4" bearing with R4-ZZ?
Not automatically.
Confirm the complete bore, outside diameter, width, shield/seal type, material, and application requirements before replacement.

What if I need the flanged version?
See our SFR4-ZZ Flanged Stainless Steel Ball Bearing for the flanged configuration.

What if I only have the old bearing?
Send us a photo, the dimensions you can measure, the original marking, or the physical sample.
You don't need to know the exact replacement model before contacting us.

Need to Confirm R4-ZZ?

Send us: Part Number · Dimensions · Photo · Drawing · Sample
We'll confirm: Size · Configuration · Material · Availability
Before you place the order.

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