SB120ARO Bore 12 Inch, Imperial Open Type A, Angular Contact Ball Bearings
The SB120ARO 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 SB120ARO bearing is a Inch Open Type A Angular Contact Ball Bearings with an inner diameter of 12 inch , an outer diameter of 12.625 inch, a width of 0.3125 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 1625 N, its static radial rated load is approximately 5840 N. Its dynamic axial rated load is approximately 18860 N, its static axial rated load is approximately 74993 N. Open (No seal) type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Interchange code: KAYDON KDY.KB120AR0, SILVERTHIN SB120AR0, SKF FPAB1200, FAG L15RA1200, NSK NBA30407, INA CSEB120, SSB RB120AR0, NTN KYB120
SB120ARO bearings ( 12 inch x 12.625 inch x 0.3125 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 | SB120ARO |
| Bore | Cylindrical |
| Balls | standard 5/32" balls |
| Bearing Type | Inch Open Type A Angular Contact Ball Bearings |
| Cage | Brass; one piece pocket separator |
| Series | SB SERIES 5/16" X 5/16" |
| 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.KB120AR0 SILVERTHIN SB120AR0 SKF FPAB1200 FAG L15RA1200 NSK NBA30407 INA CSEB120 SSB RB120AR0 NTN KYB120 |
| Interchangeable | SILVER THIN SB120ARO |
| Rows NO. | One |
| L1 Land Diameter [inch] | 12.231 |
| L2 Land Diameter [inch] | 12.393 |
| L3 Land Diameter [inch] | 12.445 |
| Fillet radius (Note 2) max | 0.040" |
| RADIAL DYNAMIC [lbf] | 1625 |
| RADIAL STATIC [lbf] | 5840 |
| THRUST DYNAMIC [lbf] | 4239 |
| THRUST STATIC [lbf] | 16858 |
| APPROX WEIGHT [lb] | 0.83 |
The SB120ARO 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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