KD042AR0 Angular Contact Ball Bearing (type A), Solid Brass Cage
The KD042AR0 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 KD042AR0 bearing is a Thin-section bearings with an inner diameter of 4.25 inch , an outer diameter of 5.25 inch, a width of 0.5 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 8253.2 N, its static radial rated load is approximately 16655.5 N. Its dynamic axial rated load is approximately 19645 N, its static axial rated load is approximately 48166.5 N. open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Equivalent: KAYDON KDN.KD042AR0, SILVERTHIN SD042AR0, SKF FPAD404, FAG L15TA404, NSK NBA10712, INA CSAD042, SSB RD042AR0, NTN KYD042
KD042AR0 bearings ( 4.25 inch x 5.25 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 | KD042AR0 |
| Series | KD 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 KD042AR0 |
| Manufacturer Part Code | KD042AR0 |
| 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] | 0.84 |
| Contact angle - α [°] | 30 |
| Balls | Circular pocket separator 1/4" balls |
| Temperature - T(min) [°C] | -30 |
| Temperature - T(max) [°C] | +110 |
| Shaft diameter [inch] | 4.25 |
| F chamfer [inch] | 0.060 |
| H Radial cross section [inch] | 0.5 |
| Radial Thickness x Width ["] | D = 0.500 x 0.500 |
| d φ Inside [inch] | 4.25 |
| D Φ Outside [inch] | 5.25 |
| B Width [inch] | 0.5 |
| L1 Land Dia. [inch] | 4.62 |
| L2 Land Dia. [inch] | 4.88 |
| L3 Land Dia. [inch] | 4.991 |
| Cr Dynamic Radial [lbf] | 1868 |
| C0r Static Radial [lbf] | 3678 |
| Ca Dynamic Axial [lbf] | 4409 |
| C0a Static Axial [lbf] | 10817 |
The KD042AR0 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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