QJ304-MPA Bore 20 Mm, Four Point Contact Bearings, Solid Brass Cage
The QJ304-MPA Four-point contact ball bearings are widely used in equipment requiring space and complex load-bearing capacity, such as industrial robots (wrist joints), machine tools (rotary tables), medical equipment (CT scanner rotating frames), radar antennas, solar tracking systems, and lifting machinery.
The QJ304-MPA bearing is a Four point contact bearings with an inner diameter of 20 mm , an outer diameter of 52 mm, a width of 15 mm. It typically uses PN (ABEC-1) grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Its dynamic radial rated load is approximately 30812 N, its static radial rated load is approximately 19366 N. It uses CN standard radial clearance, Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
QJ304-MPA bearings ( 20 mm x 52 mm x 15 mm) have the advantages of Bidirectional load-bearing capacity, space-saving, and high rigidity, and are therefore widely used in the Gearboxes, compressors, lifting machinery.
| Part Number | QJ304-MPA |
| Bearing Type | Four point contact bearings |
| Cage | MPA = Solid brass cage, outer ring guided |
| Internal clearance | CN |
| Type | QJ |
| Heat stabilization | S0 = up to 150°C |
| Manufacturer Part Code | QJ304-XL-MPA |
| Contact angle - α | 35 ° |
| Bearing Mass - m [lb] | 0.4056 |
| Performance | |
| Radial Dynamic - Cr [lbf] | 6926 |
| Radial static - C0r [lbf] | 4353 |
| Radial Fatigue - Cur [lbf] | 267 |
| Reference speed - nϑr [min–1] | 10664 |
| Limiting speed - nG [min–1] | 25989 |
| Dimension | |
| Inside - d φ [inch] | 0.7874 |
| Outside - D Φ [inch] | 2.0472 |
| Width - B [inch] | 0.5906 |
| r(min.) [inch] | 0.0433 |
| D1 [inch] | 1.6299 |
| d1 [inch] | 1.2047 |
| a [inch] | 1.0236 |
| Mounting dimensions | |
| da(min.) [inch] | 1.0630 |
| Da(max.) [inch] | 1.7717 |
| ra(max.) [inch] | 0.0394 |
The QJ304-MPA Four-point contact ball bearings primarily consist of an inner ring (usually a double-half inner ring or an integral one), an outer ring, steel balls, and a cage. The raceways are Gothic arched, and the steel balls form four-point contact with the inner and outer rings. Gears can be integrated into the inner and outer rings, resulting in a compact structure.
A single set of four-point contact ball bearings can simultaneously withstand radial loads, bidirectional axial loads, and overturning moments, eliminating the need for paired installation. They feature low axial height and light weight, saving installation space. They possess high rigidity and low friction characteristics, making them suitable for light to medium load conditions.
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