Document Overview:
This document provides detailed technical specifications for precision miniature ball bearings manufactured by JESA. It includes dimensional data, bearing types, load capacities, speed limits, lubrication options, and other key parameters.

1. Bearing Types and Designations:
- Bearings are identified by codes such as 618/2, 638/2, 629/2, etc.
- Variants include open bearings, RS (single rubber seal), 2RS (double rubber seal), Z (single metal shield), and 2Z (double metal shield).
- The document lists availability of cages and ball counts for each bearing.

2. Dimensions and Physical Parameters:
- Key dimensions include inner diameter (da min), outer diameter (Da max), and width (B).
- Typical inner diameters range from 2 mm to 16 mm.
- Widths vary from 0.08 mm to 0.30 mm depending on the bearing.
- Unit weights are provided in kilograms.

3. Load Capacities:
- Dynamic and static radial load capacities are specified in Newtons (N).
- Dynamic loads range approximately from 36,000 N to 85,000 N.
- Static loads range approximately from 43,000 N to 100,000 N.

4. Speed Limits:
- Maximum rotational speeds are given in revolutions per minute (rpm).
- Speed limits vary by bearing type and lubrication, typically between 6,000 rpm and 14,000 rpm.

5. Lubrication and Sealing Options:
- Bearings are available open or with seals/shields (RS, 2RS, Z, 2Z).
- Lubrication is specified as oil or grease.
- Sealed bearings provide protection against contamination and retain lubrication.

6. Additional Parameters and Notes:
- The document includes coefficients related to bearing stiffness or friction (values like 0.00015 to 0.00500).
- Ball counts per bearing vary, typically between 6 and 11.
- Cage types and materials are indicated but not detailed.

7. Manufacturer Information:
- JESA spinning solutions SA, Switzerland.
- Contact details and website provided.

Summary:
This technical sheet is a comprehensive reference for selecting precision miniature ball bearings from JESA, detailing all critical mechanical and dimensional parameters, load ratings, speed capabilities, and sealing/lubrication options. It supports engineers and designers in choosing appropriate bearings for high-precision applications requiring miniature components with defined load and speed requirements.