KB120AR0 Angular Contact Ball Bearing (type A), Solid Brass Cage
The KB120AR0 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 KB120AR0 bearing is a Thin-section bearings with an inner diameter of 12 inch , an outer diameter of 12.625 inch, a width of 0.3125 inch. It typically uses Precision Class 1 per ABEC 1F grade precision tolerances and AISI 52100 steel rings, AISI 52100 steel rolling mlement. Its dynamic radial rated load is approximately 7201.35 N, its static radial rated load is approximately 25954 N. Its dynamic axial rated load is approximately 18807 N, its static axial rated load is approximately 74945 N. open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Interchange code: KAYDON KDN.KB120AR0, SILVERTHIN SB120AR0, SKF FPAB1200, FAG L15RA1200, NSK NBA30407, INA CSEB120, SSB RB120AR0, NTN KYB120
KB120AR0 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 | KB120AR0 |
| Series | KB Series |
| Precision ABEC | Precision Class 1 per ABEC 1F |
| Thin section bearings type | Standard Open REALI-SLIM Inch Series Bearing |
| Ring | AISI 52100 steel |
| Reference From | Kaydon KB120AR0 |
| Manufacturer Part Code | KB120AR0 |
| Seal type | open |
| Rolling bearing type | Angular contact ball bearing (type A) |
| Coating | No |
| Cage | Solid brass |
| Lubricant | No |
| Unit of measurement | inch |
| Separator | R = One-piece, circular pocket, stamped brass or non-metallic composite cage |
| Contact type | 2-point contact |
| Races/Balls Material | K = AISI 52100 steel rings and balls, no seals (open) |
| Weight [lb] | 0.85 |
| Contact angle - α [°] | 30 |
| Balls | Circular pocket separator 5/32" balls |
| Temperature - T(min) [°C] | -30 |
| Temperature - T(max) [°C] | +110 |
| Shaft diameter [inch] | 12 |
| F chamfer [inch] | 0.040 |
| H Radial cross section [inch] | 0.3125 |
| Radial Thickness x Width ["] | B = 0.3125 x 0.3125 |
| d φ Inside [inch] | 12 |
| D Φ Outside [inch] | 12.625 |
| B Width [inch] | 0.3125 |
| L1 Land Dia. [inch] | 12.231 |
| L2 Land Dia. [inch] | 12.393 |
| L3 Land Dia. [inch] | 12.445 |
| Cr Dynamic Radial [lbf] | 1607 |
| C0r Static Radial [lbf] | 5800 |
| Ca Dynamic Axial [lbf] | 4229 |
| C0a Static Axial [lbf] | 16843 |
The KB120AR0 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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