SD250ARO Bore 25 Inch, Imperial Open Type A, Angular Contact Ball Bearings
The SD250ARO Thin-section angular contact ball bearings are primarily used in applications with stringent requirements for weight, space, and precision, such as aerospace gyroscopes, robotic joints, medical CT scanner gantries, machine tool spindles, semiconductor manufacturing equipment, optical instruments (e.g., telescopes), and precision rotary tables.
The SD250ARO bearing is a Inch Open Type A Angular Contact Ball Bearings with an inner diameter of 25 inch , an outer diameter of 26 inch, a width of 0.5 inch. It typically uses ISO Class NORMAL / ABEC-1 grade precision tolerances and AISI 52100 Steel rings, AISI 52100 Steel rolling mlement. Its dynamic radial rated load is approximately 4910 N, its static radial rated load is approximately 20140 N. Its dynamic axial rated load is approximately 60226 N, its static axial rated load is approximately 258607 N. Open (No seal) type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Interchange code: KAYDON KDY.KD250AR0, SILVERTHIN SD250AR0, SKF FPAD2500, FAG L15TA2500, NSK NBA63512, INA CSAD250, SSB RD250AR0, NTN KYD250
SD250ARO bearings ( 25 inch x 26 inch x 0.5 inch) have the advantages of Extremely compact, lightweight design, composite load-bearing capacity, high rigidity, and flexible installation, and are therefore widely used in the Robot joints, aerospace, semiconductor equipment, medical instruments and optoelectronic turntables.
| Part Number | SD250ARO |
| Bore | Cylindrical |
| Balls | standard 1/4" balls |
| Bearing Type | Inch Open Type A Angular Contact Ball Bearings |
| Cage | Brass; one piece pocket separator |
| Series | SD SERIES 1/2" X 1/2" |
| Race Width Tolerance | +0.000 -0.005" |
| Contact angle [°] | 30 |
| Temperature - T(min) [°C] | -30 |
| Temperature - T(max) [°C] | 110 |
| Seal type | Open (No seal) |
| Units | Inch |
| Load | radial, axial, moment and combined loads |
| Rolling Element Type | Balls |
| Ball Material | AISI 52100 Steel |
| Rolling Element Material | AISI 52100 Steel |
| Precision Class | ISO Class NORMAL / ABEC-1 |
| Equivalent | KAYDON KDY.KD250AR0 SILVERTHIN SD250AR0 SKF FPAD2500 FAG L15TA2500 NSK NBA63512 INA CSAD250 SSB RD250AR0 NTN KYD250 |
| Interchangeable | SILVER THIN SD250ARO |
| Rows NO. | One |
| L1 Land Diameter [inch] | 25.37 |
| L2 Land Diameter [inch] | 25.63 |
| L3 Land Diameter [inch] | 25.688 |
| Fillet radius (Note 2) max | 0.060" |
| RADIAL DYNAMIC [lbf] | 4910 |
| RADIAL STATIC [lbf] | 20140 |
| THRUST DYNAMIC [lbf] | 13538 |
| THRUST STATIC [lbf] | 58134 |
| APPROX WEIGHT [lb] | 4.79 |
The SD250ARO Thin-section angular contact ball bearings mainly consist of a thin-walled inner ring, a thin-walled outer ring, steel balls, and a cage. Their cross-sectional dimensions are constant and extremely thin, with contact angles typically of 15°, 25°, or 30°, making them suitable for space-constrained installations.
Thin-section angular contact ball bearings utilize a thin-walled, constant cross-section design, resulting in lightweight construction and a small footprint, effectively reducing the overall weight of equipment. They can simultaneously withstand radial and axial loads, possessing high rigidity, high-speed capability, and good positioning accuracy, and are easy to install.
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