NA040ARO Angular Contact Thin Section Bearing (type A), Solid Brass Cage
The NA040ARO 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 NA040ARO bearing is a Thin-section bearings with an inner diameter of 3.9998 inch , an outer diameter of 4.5003 inch, a width of 0.25 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 2560.75 N, its static radial rated load is approximately 6599.5 N. Its dynamic axial rated load is approximately 6469.5 N, its static axial rated load is approximately 19120 N. open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
NA040ARO bearings ( 3.9998 inch x 4.5003 inch x 0.25 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 | NA040ARO |
| Series | NA Series |
| Precision ABEC | Precision Class 1 per ABEC 1F |
| Thin section bearings type | Open ENDURAKOTE-Plated ENDURA-SLIM Bearing |
| Ring | AISI 52100 steel |
| Reference From | Kaydon NA040ARO |
| Manufacturer Part Code | NA040AR0 |
| Seal type | open |
| Rolling bearing type | Angular contact ball bearing (type A) |
| Coating | Endurakote hard chromium |
| Alias | Corrosion-Resistant Bearings |
| 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 | N = AISI 52100 steel rings - Endurakote coated, AISI 440C stainless balls, no seals (open) |
| Weight [lb] | 0.19 |
| Contact angle - α [°] | 30 |
| Balls | Circular pocket separator 1/8" balls |
| Temperature - T(min) [°C] | -30 |
| Temperature - T(max) [°C] | +110 |
| Shaft diameter [inch] | 3.9998 |
| F chamfer [inch] | 0.025 |
| H Radial cross section [inch] | 0.25 |
| Radial Thickness x Width ["] | A = 0.250 x 0.250 |
| d φ Inside [inch] | 3.9998 |
| D Φ Outside [inch] | 4.5003 |
| B Width [inch] | 0.25 |
| L1 Land Dia. [inch] | 4.186 |
| L2 Land Dia. [inch] | 4.314 |
| L3 Land Dia. [inch] | 4.367 |
| Cr Dynamic Radial [lbf] | 577 |
| C0r Static Radial [lbf] | 1480 |
| Ca Dynamic Axial [lbf] | 1453 |
| C0a Static Axial [lbf] | 4291 |
The NA040ARO 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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