Miniature & Extra Small Ball Bearings
R144 Miniature & Extra Small Ball Bearing
3.175 × 6.356 × 2.38 mm
R144 is a miniature & extra small ball bearing from the MX-4 series with a 3.175 mm bore, a 6.356 mm outside diameter and a 2.38 mm width. It has a dynamic load rating of 256 N and a static load rating of 86 N and a speed rating of 63,000 rpm (oil lubrication), weighing about 0.27 g. The radial cross-section (D − d) is 3.18 mm.
Brands: NTN, FAG, SKF, NBC, DTC, SLS
R144 Specifications
| Bearing No. | R144 |
|---|---|
| d (Bore) | 3.175 mm |
| D (Outer Dia.) | 6.356 mm |
| B (Width) | 2.38 mm |
| Dynamic Load | 256 N |
| Static Load | 86 N |
| Max. RPM | 63,000 |
| Weight | 0.27 g |
| Series | Open Type Miniature & Extra Small Ball Bearings (1.984mm–9.525mm bore) |
R144 Variants & Designations
Typical designations for this size, subject to availability. Full suffix meanings are listed on the MX-4 series page.
Neighbouring Sizes in the MX-4 Series
R144 — Frequently Asked Questions
What are the dimensions of the R144 bearing?
The R144 has a bore (d) of 3.175 mm, an outside diameter (D) of 6.356 mm and a width of 2.38 mm, so it is written 3.175 × 6.356 × 2.38 mm.
What is the load rating of the R144?
Dynamic load rating 256 N and static load rating 86 N. The speed rating is 63,000 rpm with oil lubrication; for grease lubrication use about 75% of that value.
Is the R144 available with seals, special clearance or other options?
Yes, subject to availability. Typical designations include R144-ZZ (metal shields on both sides), R144-2RS (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 R144?
Other miniature & extra small ball bearings with a 3.175 mm bore include R2-5 (7.938 mm OD), R2-6 (9.525 mm OD), R2 (9.525 mm OD), R2A (12.7 mm OD). A larger outside diameter generally means a higher load rating.
Do you supply the R144 bearing across India?
Yes. Logass Trade Centre supplies the R144 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 R144?
Share your quantity and preferred brand — our technical team will confirm availability and pricing within one business day.