Miniature & Extra Small Ball Bearings
R2A Miniature & Extra Small Ball Bearing
3.175 × 12.7 × 4.366 mm
R2A is a miniature & extra small ball bearing from the MX-4 series with a 3.175 mm bore, a 12.7 mm outside diameter and a 4.366 mm width. It has a dynamic load rating of 1,035 N and a static load rating of 355 N and a speed rating of 45,900 rpm (oil lubrication), weighing about 2.5 g. The radial cross-section (D − d) is 9.52 mm.
Brands: NTN, FAG, SKF, NBC, DTC, SLS
R2A Specifications
| Bearing No. | R2A |
|---|---|
| d (Bore) | 3.175 mm |
| D (Outer Dia.) | 12.7 mm |
| B (Width) | 4.366 mm |
| Dynamic Load | 1,035 N |
| Static Load | 355 N |
| Max. RPM | 45,900 |
| Weight | 2.5 g |
| Series | Open Type Miniature & Extra Small Ball Bearings (1.984mm–9.525mm bore) |
R2A Variants & Designations
Typical designations for this size, subject to availability. Full suffix meanings are listed on the MX-4 series page.
R2A-ZZ
metal shields on both sides
R2A-2RS
rubber seals on both sides
Neighbouring Sizes in the MX-4 Series
R2A — Frequently Asked Questions
What are the dimensions of the R2A bearing?
The R2A has a bore (d) of 3.175 mm, an outside diameter (D) of 12.7 mm and a width of 4.366 mm, so it is written 3.175 × 12.7 × 4.366 mm.
What is the load rating of the R2A?
Dynamic load rating 1,035 N and static load rating 355 N. The speed rating is 45,900 rpm with oil lubrication; for grease lubrication use about 75% of that value.
Is the R2A available with seals, special clearance or other options?
Yes, subject to availability. Typical designations include R2A-ZZ (metal shields on both sides), R2A-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 R2A?
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), R2 (9.525 mm OD). A larger outside diameter generally means a higher load rating.
Do you supply the R2A bearing across India?
Yes. Logass Trade Centre supplies the R2A 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 R2A?
Share your quantity and preferred brand — our technical team will confirm availability and pricing within one business day.