Miniature & Extra Small Ball Bearings
F684 Miniature & Extra Small Ball Bearing
4 × 8 × 2.5 mm
F684 is a miniature & extra small ball bearing from the MXF-1 series with a 4 mm bore, a 8 mm outside diameter and a 2.5 mm width. It has a dynamic load rating of 576 N and a static load rating of 203 N and a speed rating of 54,900 rpm (oil lubrication), weighing about 0.74 g. The radial cross-section (D − d) is 4 mm.
Brands: NTN, FAG, SKF, NBC, DTC, SLS
F684 Specifications
| Bearing No. | F684 |
|---|---|
| d (Bore) | 4 mm |
| D (Outer Dia.) | 8 mm |
| D (Outer Dia.) | 8 mm |
| B (Width) | 2.5 mm |
| C (Flange Width) | 0.6 mm |
| Dynamic Load | 576 N |
| Static Load | 203 N |
| Max. RPM | 54,900 |
| Weight | 0.74 g |
| Series | Flange Type Miniature & Extra Small Ball Bearings (1.5mm–4mm bore) |
F684 Variants & Designations
Typical designations for this size, subject to availability. Full suffix meanings are listed on the MXF-1 series page.
Neighbouring Sizes in the MXF-1 Series
F684 — Frequently Asked Questions
What are the dimensions of the F684 bearing?
The F684 has a bore (d) of 4 mm, an outside diameter (D) of 8 mm and a width of 2.5 mm, so it is written 4 × 8 × 2.5 mm.
What is the load rating of the F684?
Dynamic load rating 576 N and static load rating 203 N. The speed rating is 54,900 rpm with oil lubrication; for grease lubrication use about 75% of that value.
Is the F684 available with seals, special clearance or other options?
Yes, subject to availability. Typical designations include F684-ZZ (metal shields on both sides), F684-2RS (rubber seals on both sides). Tell us the exact designation you need in a quote request.
Which other bearings have the same 4 mm bore as the F684?
Other miniature & extra small ball bearings with a 4 mm bore include F4M07 (7 mm OD), 633 (7 mm OD), 4M07 (8 mm OD), F4M08 (8.2 mm OD). A larger outside diameter generally means a higher load rating.
Do you supply the F684 bearing across India?
Yes. Logass Trade Centre supplies the F684 Pan India with technical support, from single pieces to bulk orders. Use the quote button to share your quantity and brand preference.
Can’t find your size?
We supply sizes, brands and special versions of miniature & extra small ball bearings that are not listed on this page. Type the exact size or designation you need and send it to us for a quote.
Need pricing on the F684?
Share your quantity and preferred brand — our technical team will confirm availability and pricing within one business day.