Miniature & Extra Small Ball Bearings
634 Miniature & Extra Small Ball Bearing
3 × 9 × 2.5 mm
634 is a miniature & extra small ball bearing from the MX-1 series with a 3 mm bore, a 9 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 59,400 rpm (oil lubrication), weighing about 0.75 g. The radial cross-section (D − d) is 6 mm.
Brands: NTN, FAG, SKF, NBC, DTC, SLS
634 Specifications
| Bearing No. | 634 |
|---|---|
| d (Bore) | 3 mm |
| D (Outer Dia.) | 9 mm |
| B (Width) | 2.5 mm |
| Dynamic Load | 576 N |
| Static Load | 203 N |
| Max. RPM | 59,400 |
| Weight | 0.75 g |
| Series | Open Type Miniature & Extra Small Ball Bearings (1.5mm–3mm bore) |
634 Variants & Designations
Typical designations for this size, subject to availability. Full suffix meanings are listed on the MX-1 series page.
634-ZZ
metal shields on both sides
634-2RS
rubber seals on both sides
Neighbouring Sizes in the MX-1 Series
634 — Frequently Asked Questions
What are the dimensions of the 634 bearing?
The 634 has a bore (d) of 3 mm, an outside diameter (D) of 9 mm and a width of 2.5 mm, so it is written 3 × 9 × 2.5 mm.
What is the load rating of the 634?
Dynamic load rating 576 N and static load rating 203 N. The speed rating is 59,400 rpm with oil lubrication; for grease lubrication use about 75% of that value.
Is the 634 available with seals, special clearance or other options?
Yes, subject to availability. Typical designations include 634-ZZ (metal shields on both sides), 634-2RS (rubber seals on both sides). Tell us the exact designation you need in a quote request.
Which other bearings have the same 3 mm bore as the 634?
Other miniature & extra small ball bearings with a 3 mm bore include F683 (6 mm OD), 3M06 (6 mm OD), F3M08 (7 mm OD), 683 (7 mm OD). A larger outside diameter generally means a higher load rating.
Do you supply the 634 bearing across India?
Yes. Logass Trade Centre supplies the 634 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 634?
Share your quantity and preferred brand — our technical team will confirm availability and pricing within one business day.