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6700 / 6800 / 6900 Thin-Section SeriesDeep Groove Ball Bearings

684A

d 4 × D 9 × B 2.5 mm

The 684A is a deep groove ball bearing with bore 4mm, outer diameter 9mm, and width 2.5mm rated for dynamic load 0.7 kN.

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684A — representative product photo
Representative product
684A · 4x9x2.5 mm

📋 Technical Specifications

Bore (d)
4mm
Outer Dia. (D)
9mm
Width (B)
2.5mm
Dynamic Load (Cr)
0.70 kN(705 N)
Static Load (C0r)
0.23 kN(225 N)
Reference Speed
53000rpm
Bearing typeDeep Groove Ball Bearings
Series6700 / 6800 / 6900 Thin-Section Series
Seal typeOpen
MaterialConfirmed per inquiry — grade and certificate availability reviewed before quotation
Bore typeConfirmed per drawing
Dimension unitmillimeter (mm)

📐 Detailed Dimensions

Basic dimensions (mm)

Bore diameter (d)4
Outer diameter (D)9
Width (B)2.5

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

📑 Drawings & 3D Model

684A bearing dimension drawing, 4 x 9 x 2.5 mm
684A dimension drawing: bore d 4 mm × outer diameter D 9 mm × width B 2.5 mm. Tolerance class ABEC-1 (P0). Internal design is shown schematically.
📑
2D Drawing (PDF)
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📐
2D DXF File
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📅
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
53,000 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 4x9x2.5 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
618/4Same boundary dimensions — verify fit/loadMiniature 600 SeriesOpenQuote →
684Same boundary dimensions — verify fit/load6700 / 6800 / 6900 Thin-Section SeriesOpenQuote →
SF684Same boundary dimensions — verify fit/loadF684OpenQuote →

🔄 Related Models

Same bearing family or similar dimensions.

Same model family — dimensions may differ
684A ZZ
4x9x4 mm
Extra Small / Miniature Deep Groove Ball Bearing
B +1.5mm

⚙ 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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4,300+
Models
15+
Years
RFQ
Specification Confirmed

❓ Frequently Asked Questions

What are the dimensions of 684A?
The 684A bearing has bore (d) = 4 mm, outer diameter (D) = 9 mm, and width (B) = 2.5 mm.
Is there a 684A drawing or CAD file?
Yes. The 684A 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 684A?
Dynamic load rating (Cr) = 0.70 kN (705 N), static load rating (C0r) = 0.23 kN.
What tolerance class is the 684A?
The standard tolerance class of the 684A is ABEC-1 (P0) per GB/T 307.1, unless otherwise agreed.
What bearing series does 684A belong to?
The 684A belongs to the 6700 / 6800 / 6900 Thin-Section Series within the Deep Groove Ball Bearings category.
Can NLHB supply 684A 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 684A 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 684A?
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.

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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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