Miniature & Extra Small Ball Bearings
684 Miniature & Extra Small Ball Bearing
4 × 10 × 3 mm
684 is a miniature & extra small ball bearing from the MX-2 series with a 4 mm bore, a 10 mm outside diameter and a 3 mm width. It has a dynamic load rating of 585 N and a static load rating of 212 N and a speed rating of 49,500 rpm (oil lubrication), weighing about 0.9 g. The radial cross-section (D − d) is 6 mm.
Brands: NTN, FAG, SKF, NBC, DTC, SLS
684 Specifications
| Bearing No. | 684 |
|---|---|
| d (Bore) | 4 mm |
| D (Outer Dia.) | 10 mm |
| B (Width) | 3 mm |
| Dynamic Load | 585 N |
| Static Load | 212 N |
| Max. RPM | 49,500 |
| Weight | 0.9 g |
| Series | Open Type Miniature & Extra Small Ball Bearings (3mm–5mm bore) |
684 Variants & Designations
Typical designations for this size, subject to availability. Full suffix meanings are listed on the MX-2 series page.
684-ZZ
metal shields on both sides
684-2RS
rubber seals on both sides
Neighbouring Sizes in the MX-2 Series
684 — Frequently Asked Questions
What are the dimensions of the 684 bearing?
The 684 has a bore (d) of 4 mm, an outside diameter (D) of 10 mm and a width of 3 mm, so it is written 4 × 10 × 3 mm.
What is the load rating of the 684?
Dynamic load rating 585 N and static load rating 212 N. The speed rating is 49,500 rpm with oil lubrication; for grease lubrication use about 75% of that value.
Is the 684 available with seals, special clearance or other options?
Yes, subject to availability. Typical designations include 684-ZZ (metal shields on both sides), 684-2RS (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 684?
Other miniature & extra small ball bearings with a 4 mm bore include F4M07 (7 mm OD), 633 (7 mm OD), F684 (8 mm OD), 4M07 (8 mm OD). A larger outside diameter generally means a higher load rating.
Do you supply the 684 bearing across India?
Yes. Logass Trade Centre supplies the 684 Pan India with technical support, from single pieces to bulk orders. Use the quote button to share your quantity and brand preference.
Need pricing on the 684?
Share your quantity and preferred brand — our technical team will confirm availability and pricing within one business day.