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Extended Inner-Ring Flanged BearingsDeep Groove Ball Bearings

SMF84

d 4 × D 8 × B 2 mm

The SMF84 is a deep groove ball bearing with bore 4mm, outer diameter 8mm, and width 2mm rated for dynamic load 0.3 kN.

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SMF84 — representative product photo
Representative product
SMF84 · 4x8x2 mm

📋 Technical Specifications

Bore (d)
4mm
Outer Dia. (D)
8mm
Width (B)
2mm
Dynamic Load (Cr)
0.30 kN(302 N)
Static Load (C0r)
0.10 kN(102 N)
Reference Speed
50400rpm
Bearing typeDeep Groove Ball Bearings
SeriesExtended Inner-Ring Flanged Bearings
Seal typeOpen
MaterialConfirmed per inquiry — grade and certificate availability reviewed before quotation
Bore typeConfirmed per drawing
Dimension unitmillimeter (mm)

🔐 Model Code Breakdown

What each part of SMF84 means.

SMF
Super Mini Flange
SMFSMF = super-miniature 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 shieldsSMF84 ZZ (inquiry only)General dust protectionQuote →
Double contact rubber sealsSMF84 2RS (inquiry only)Dust and moisture protection at moderate speedQuote →
Double non-contact rubber sealsSMF84 2RZ (inquiry only)Lower-friction sealing at higher speedQuote →
C3 radial clearanceSMF84 C3 (inquiry only)Motors and applications with higher operating temperatureQuote →

📐 Detailed Dimensions

Basic dimensions (mm)

Bore diameter (d)4
Outer diameter (D)8
Width (B)2

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

📑 Drawings & 3D Model

SMF84 bearing dimension drawing, 4 x 8 x 2 mm
SMF84 dimension drawing: bore d 4 mm × outer diameter D 8 mm × width B 2 mm. Tolerance class ABEC-1 (P0). Internal design is shown schematically. Flange Ø Df 9.2 mm, flange width Bf 0.6 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
50,400 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 4x8x2 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
MF84Different outer-ring featureExtended Inner-Ring Flanged BearingsOpenQuote →

🔄 Related Models

Same bearing family or similar dimensions.

Same model family — dimensions may differ
SMF84 2rs
4x8x3 mm
SMF84
B +1.0mm
Similar size — reference only, verify all interfaces
MF84 2rs
4x8x3 mm
MF84
B +1.0mm
MF84 ZZ
4x8x3 mm
MF84
B +1.0mm
MR84
4x8x3 mm
MR Miniature Series
B +1.0mm
MR84 2rs
4x8x3 mm
MR
B +1.0mm
MR84 ZZ
4x8x3 mm
MR
B +1.0mm
SMF84zz
4x8x3 mm
SMF84
B +1.0mm

⚙ 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 SMF84?
The SMF84 bearing has bore (d) = 4 mm, outer diameter (D) = 8 mm, and width (B) = 2 mm.
Is there a SMF84 drawing or CAD file?
Yes. The SMF84 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 SMF84?
Dynamic load rating (Cr) = 0.30 kN (302 N), static load rating (C0r) = 0.10 kN.
What tolerance class is the SMF84?
The standard tolerance class of the SMF84 is ABEC-1 (P0) per GB/T 307.1, unless otherwise agreed.
What bearing series does SMF84 belong to?
The SMF84 belongs to the Extended Inner-Ring Flanged Bearings within the Deep Groove Ball Bearings category.
Can NLHB supply SMF84 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 SMF84 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 SMF84?
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 SMF84

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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