Miniature & Extra Small Ball Bearings
R188 Miniature & Extra Small Ball Bearing
6.35 × 12.7 × 3.175 mm
R188 is a miniature & extra small ball bearing from the MX-4 series with a 6.35 mm bore, a 12.7 mm outside diameter and a 3.175 mm width. It has a dynamic load rating of 747 N and a static load rating of 333 N and a speed rating of 41,400 rpm (oil lubrication), weighing about 1.6 g. The radial cross-section (D − d) is 6.35 mm.
Brands: NTN, FAG, SKF, NBC, DTC, SLS
R188 Specifications
| Bearing No. | R188 |
|---|---|
| d (Bore) | 6.35 mm |
| D (Outer Dia.) | 12.7 mm |
| B (Width) | 3.175 mm |
| Dynamic Load | 747 N |
| Static Load | 333 N |
| Max. RPM | 41,400 |
| Weight | 1.6 g |
| Series | Open Type Miniature & Extra Small Ball Bearings (1.984mm–9.525mm bore) |
R188 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
R188 — Frequently Asked Questions
What are the dimensions of the R188 bearing?
The R188 has a bore (d) of 6.35 mm, an outside diameter (D) of 12.7 mm and a width of 3.175 mm, so it is written 6.35 × 12.7 × 3.175 mm.
What is the load rating of the R188?
Dynamic load rating 747 N and static load rating 333 N. The speed rating is 41,400 rpm with oil lubrication; for grease lubrication use about 75% of that value.
Is the R188 available with seals, special clearance or other options?
Yes, subject to availability. Typical designations include R188-ZZ (metal shields on both sides), R188-2RS (rubber seals on both sides). Tell us the exact designation you need in a quote request.
Which other bearings have the same 6.35 mm bore as the R188?
Other miniature & extra small ball bearings with a 6.35 mm bore include R168 (9.525 mm OD), R4 (15.875 mm OD), R4A (19.05 mm OD). A larger outside diameter generally means a higher load rating.
Do you supply the R188 bearing across India?
Yes. Logass Trade Centre supplies the R188 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 R188?
Share your quantity and preferred brand — our technical team will confirm availability and pricing within one business day.