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Flanged Thin-Section BearingsDeep Groove Ball BearingsSealed

FR4

d 6.35 × D 15.875 × B 4.978 mm

The FR4 is a deep groove ball bearing with bore 6.35mm, outer diameter 15.875mm, and width 4.978mm rated for dynamic load 1.3 kN.

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FR4 — representative product photo
Representative product
FR4 · 6.35x15.875x4.978 mm

📋 Technical Specifications

Bore (d)
6.35mm
Outer Dia. (D)
15.875mm
Width (B)
4.978mm
Dynamic Load (Cr)
1.26 kN(1259 N)
Static Load (C0r)
0.50 kN(498 N)
Reference Speed
38000rpm
Bearing typeDeep Groove Ball Bearings
SeriesFlanged Thin-Section Bearings
Seal typeSealed
MaterialConfirmed per inquiry — grade and certificate availability reviewed before quotation
Bore typeConfirmed per drawing
Measurement systemInch (imperial). Metric values converted at 25.4 mm/in; inch values in brackets.

🔐 Model Code Breakdown

What each part of FR4 means.

FR
Flange Inch
FRFR = inch-series flange

📋 Nominal Variants by Seal Type

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

Seal TypeModel CodeTypical Use
Double metal shieldsFR4 ZZ (inquiry only)General dust protectionQuote →
Double contact rubber sealsFR4 2RS (inquiry only)Dust and moisture protection at moderate speedQuote →
Double non-contact rubber sealsFR4 2RZ (inquiry only)Lower-friction sealing at higher speedQuote →
C3 radial clearanceFR4 C3 (inquiry only)Motors and applications with higher operating temperatureQuote →

📐 Detailed Dimensions

Basic dimensions (mm)

Bore diameter (d)6.35 (0.25")
Outer diameter (D)15.875 (0.625")
Width (B)4.978 (0.196")

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

📑 Drawings & 3D Model

FR4 bearing dimension drawing, 6.35 x 15.875 x 4.978 mm
FR4 dimension drawing: bore d 6.35 mm × outer diameter D 15.875 mm × width B 4.978 mm. Tolerance class ABEC-1 (P0). Internal design is shown schematically. Flange Ø Df 17.526 mm, flange width Bf 1.067 mm.
📑
2D Drawing (PDF)
Download PDF →
📐
2D DXF File
Request DXF →
📅
3D STEP Model
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The PDF drawing is free to download. DXF and 3D STEP files are sent on request: tell us the model and your application, and we reply with the CAD files.

⚡ 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 6.35x15.875x4.978 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.

ModelRelationshipSeriesSealAction
FRW4Different outer-ring featureFlanged Thin-Section BearingsOpenQuote →
FRW4zzDifferent outer-ring featureFRW4ShieldedQuote →
SFR4Different outer-ring featureFR4OpenQuote →
SFR4 2rsDifferent outer-ring featureFR4SealedQuote →
SFR4zzDifferent outer-ring featureFR4ShieldedQuote →
SFRW4Different outer-ring featureFRW4OpenQuote →
SFRW4zzDifferent outer-ring featureFRW4ShieldedQuote →

⚙ 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.

About NLHB →
4,300+
Models
15+
Years
RFQ
Specification Confirmed

❓ Frequently Asked Questions

What are the dimensions of FR4?
The FR4 bearing has bore (d) = 6.35 mm, outer diameter (D) = 15.875 mm, and width (B) = 4.978 mm.
Is there a FR4 drawing or CAD file?
Yes. The FR4 dimension drawing (PDF) is free to download on this page. DXF and 3D STEP files are sent on request: tell us the model and your application.
What is the load rating of FR4?
Dynamic load rating (Cr) = 1.26 kN (1259 N), static load rating (C0r) = 0.50 kN.
What tolerance class is the FR4?
The standard tolerance class of the FR4 is ABEC-1 (P0) per GB/T 307.1, unless otherwise agreed.
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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