Miniature & Extra Small Ball Bearings
R2 Miniature & Extra Small Ball Bearing
3.175 × 9.525 × 3.967 mm
R2 is a miniature & extra small ball bearing from the MX-4 series with a 3.175 mm bore, a 9.525 mm outside diameter and a 3.967 mm width. It has a dynamic load rating of 576 N and a static load rating of 202 N and a speed rating of 52,200 rpm (oil lubrication), weighing about 1.3 g. The radial cross-section (D − d) is 6.35 mm.
Brands: NTN, FAG, SKF, NBC, DTC, SLS
R2 Specifications
| Bearing No. | R2 |
|---|---|
| d (Bore) | 3.175 mm |
| D (Outer Dia.) | 9.525 mm |
| B (Width) | 3.967 mm |
| Dynamic Load | 576 N |
| Static Load | 202 N |
| Max. RPM | 52,200 |
| Weight | 1.3 g |
| Series | Open Type Miniature & Extra Small Ball Bearings (1.984mm–9.525mm bore) |
R2 Variants & Designations
Typical designations for this size, subject to availability. Full suffix meanings are listed on the MX-4 series page.
R2-ZZ
metal shields on both sides
R2-2RS
rubber seals on both sides
Neighbouring Sizes in the MX-4 Series
R2 — Frequently Asked Questions
What are the dimensions of the R2 bearing?
The R2 has a bore (d) of 3.175 mm, an outside diameter (D) of 9.525 mm and a width of 3.967 mm, so it is written 3.175 × 9.525 × 3.967 mm.
What is the load rating of the R2?
Dynamic load rating 576 N and static load rating 202 N. The speed rating is 52,200 rpm with oil lubrication; for grease lubrication use about 75% of that value.
Is the R2 available with seals, special clearance or other options?
Yes, subject to availability. Typical designations include R2-ZZ (metal shields on both sides), R2-2RS (rubber seals on both sides). Tell us the exact designation you need in a quote request.
Which other bearings have the same 3.175 mm bore as the R2?
Other miniature & extra small ball bearings with a 3.175 mm bore include R144 (6.356 mm OD), R2-5 (7.938 mm OD), R2-6 (9.525 mm OD), R2A (12.7 mm OD). A larger outside diameter generally means a higher load rating.
Do you supply the R2 bearing across India?
Yes. Logass Trade Centre supplies the R2 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 R2?
Share your quantity and preferred brand — our technical team will confirm availability and pricing within one business day.