Flanged Thin-Section BearingsDeep Groove Ball BearingsSealed

FR4

d 0.25 × D 0.625 × B 0.196 mm

The FR4 is a deep groove ball bearing with bore 0.25mm, outer diameter 0.625mm, and width 0.196mm rated for dynamic load 1.3 kN.

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FR4 — representative product photo — Representative product

FR4 · 0.25x0.625x0.196 mm

📋 Technical Specifications

Bore (d)

0.25mm

Outer Dia. (D)

0.625mm

Width (B)

0.196mm

Dynamic Load (Cr)

1.26 kN(1258.847 N)

Static Load (C0r)

0.50 kN(498.201 N)

Reference Speed

38000rpm

Bearing type	Deep Groove Ball Bearings
Series	Flanged Thin-Section Bearings
Seal type	Sealed
Material	Confirmed per inquiry — grade and certificate availability reviewed before quotation
Bore type	Confirmed per drawing
Dimension unit	millimeter (mm)

🔐 Model Code Breakdown

What each part of FR4 means.

Flange Inch

FR	FR = inch-series flange

📋 Nominal Variants by Seal Type

Catalog variants open a detail page. Inquiry-only configurations go directly to RFQ.

Seal Type	Model Code	Typical Use
Double metal shields	FR4 ZZ (inquiry only)	General dust protection	Quote →
Double contact rubber seals	FR4 2RS (inquiry only)	Dust and moisture protection at moderate speed	Quote →
Double non-contact rubber seals	FR4 2RZ (inquiry only)	Lower-friction sealing at higher speed	Quote →
C3 radial clearance	FR4 C3 (inquiry only)	Motors and applications with higher operating temperature	Quote →

📐 Detailed Dimensions

Basic dimensions (mm)

Bore diameter (d)	0.25
Outer diameter (D)	0.625
Width (B)	0.196

Corner radius, shoulder dimensions, fits and tolerances are confirmed against the requested suffix and application drawing before quotation.

📑 Drawings & 3D Model

📑

2D Drawing

Request drawing →

📅

3D STEP Model

Request STEP →

🔎

CAD File

Request CAD →

Drawings and 3D models are provided per inquiry. Tell us your application and we will send the appropriate file format (DXF, DWG, STEP, IGES).

⚡ Source-Data Reference Speed

Catalog reference

38,000 rpm

Lubrication method and application speed limit are confirmed per inquiry; no oil-speed value is derived from this number.

⇄ Same-size Bearings & Reference Options

The models below share the 0.25x0.625x0.196 mm boundary dimensions. Matching d/D/B alone does not prove interchangeability; verify seals, clearance, ring features, load ratings, fits, and application conditions before replacement.

Model	Relationship	Series	Seal	Action
FRW4	Different outer-ring feature	Flanged Thin-Section Bearings	Open	Quote →
FRW4zz	Different outer-ring feature	FRW4	Shielded	Quote →
SFR4	Different outer-ring feature	FR4	Open	Quote →
SFR4 2rs	Different outer-ring feature	FR4	Sealed	Quote →
SFR4zz	Different outer-ring feature	FR4	Shielded	Quote →
SFRW4	Different outer-ring feature	FRW4	Open	Quote →
SFRW4zz	Different outer-ring feature	FRW4	Shielded	Quote →

⚙ Typical Applications

Electric motors

Fans and blowers

Pumps

Household appliances

Power tools

Office equipment

General machinery

Why choose NLHB?

NLHB supports both in-house manufacturing and qualified partner sourcing. We confirm the specification, supply route, inspection requirements, and available documentation before quotation.

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4,315

Catalog Models

15+

Years

RFQ

Specification Confirmed

❓ Frequently Asked Questions

What are the dimensions of FR4?

The FR4 bearing has bore (d) = 0.25 mm, outer diameter (D) = 0.625 mm, and width (B) = 0.196 mm.

What is the load rating of FR4?

Dynamic load rating (Cr) = 1.26 kN (1258.847 N), static load rating (C0r) = 0.50 kN.

What bearing series does FR4 belong to?

The FR4 belongs to the Flanged Thin-Section Bearings within the Deep Groove Ball Bearings category.

Can NLHB supply FR4 equivalents from other brands?

Depending on the model and order requirements, NLHB may manufacture in-house or source through qualified partner factories. Interchange and supply route are confirmed against your specification before quotation. All trademarks belong to their respective owners.

How do I order FR4 from NLHB?

Click "Request Quote" and send us your quantity, application, and required specifications. We review the specification, supply route, lead time, and pricing before issuing a quotation. Response time depends on specification complexity.

What materials are available for FR4?

Material grade is confirmed per inquiry. Availability depends on the model, quantity, application, and whether the order is manufactured in-house or sourced through a qualified partner factory. Material certificates or inspection documents are confirmed before quotation when required.

Get a quote for FR4

Send us your quantity, application and target lead time. We confirm spec, interchange and realistic delivery — no order confirmed until you approve.

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FR4