JB042XPO Four-point Contact Thin Section Bearing (type X), Solid Brass Cage
The JB042XPO Thin-section four-point contact ball bearings are widely used in fields with stringent space and precision requirements, including: industrial robots (wrist and elbow joints), medical equipment (CT scanner rotating frames, surgical robots), aerospace (satellite antenna drive mechanisms), semiconductor equipment (wafer handling robotic arms), optical instruments (laser trackers, precision rotary tables), and precision machine tools (rotary worktables).
The JB042XPO bearing is a Thin-section bearings with an inner diameter of 4.25 inch , an outer diameter of 4.875 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 4928 N, its static radial rated load is approximately 8102.5 N. Its dynamic axial rated load is approximately 7882 N, its static axial rated load is approximately 20330.5 N. NBR seal on both sides type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
JB042XPO bearings ( 4.25 inch x 4.875 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 Robotics, aerospace, semiconductor equipment, medical instruments and optoelectronic turntables.
| Part Number | JB042XPO |
| Series | JB Series (double Sealed) |
| Precision ABEC | Precision Class 1 per ABEC 1F |
| Thin section bearings type | Sealed REALI-SLIM Bearings |
| Ring | AISI 52100 steel |
| Reference From | Kaydon JB042XPO |
| Manufacturer Part Code | JB042XP0 |
| Seal type | NBR seal on both sides |
| Rolling bearing type | Four-point contact ball bearing (type X) |
| Coating | No |
| Cage | Solid brass |
| Lubricant | Grease |
| Unit of measurement | inch |
| Separator | P = One-piece, snap-type, stamped brass or non-metallic composite cage |
| Contact type | Four-point contact |
| Races/Balls Material | J = AISI 52100 steel rings and balls, NBR seal on both sides |
| Weight [lb] | 0.31 |
| Contact angle - α [°] | 30 |
| Balls | Snapover separator 5/32" balls |
| Temperature - T(min) [°C] | -30 |
| Temperature - T(max) [°C] | +110 |
| Shaft diameter [inch] | 4.25 |
| 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] | 4.25 |
| D Φ Outside [inch] | 4.875 |
| B Width [inch] | 0.3125 |
| L1 Land Dia. [inch] | 4.449 |
| L2 Land Dia. [inch] | 4.675 |
| Cr Dynamic Radial [lbf] | 1112 |
| C0r Static Radial [lbf] | 1823 |
| Ca Dynamic Axial [lbf] | 1761 |
| C0a Static Axial [lbf] | 4564 |
| CM Dynamic Moment [lbf·in] | 1909 |
| C0M Static Moment [lbf·in] | 4139 |
| Starting torque max. no load | 24 (in-oz) |
| nG Speed ratings (oil) [rpm] | 575 |
The JB042XPO Thin-section four-point contact ball bearings are mainly composed of a thin-walled inner ring, a thin-walled outer ring, steel balls, and a cage. The raceway has a Gothic arch shape, and the steel balls form four-point contact with the inner and outer rings. The cross-sectional dimensions are constant and extremely thin.
Thin-section four-point contact ball bearings utilize a thin-walled constant cross-section design, resulting in lightweight construction and a small footprint. A single bearing can simultaneously withstand radial loads, bidirectional axial loads, and overturning moments. They possess high rigidity, high-speed capability, and are easy to install, making them a viable replacement for traditional combined bearings.
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