6872Z Deep Groove Ball Bearings 2Z Design, Self-retaining, Gap Seals
The 6872Z Miniature ball bearings are widely used in precision equipment with stringent space and precision requirements, such as: medical devices (dental handpieces, miniature pumps), precision instruments (flow meters, encoders), robots (miniature joints), optical equipment (camera focusing mechanisms), miniature motors, and aerospace precision instruments.
The 6872Z bearing is a Deep groove ball bearings 2Z design, self-retaining, Gap seals with an inner diameter of 7 mm , an outer diameter of 14 mm, a width of 5 mm. It typically uses PN grade precision tolerances and GCr15SiMn rings, Its dynamic radial rated load is approximately 1132 N, its static radial rated load is approximately 476 N. It uses CN standard radial clearance, 2Z = Gap seal on both sides type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
6872Z bearings ( 7 mm x 14 mm x 5 mm) have the advantages of Small size, light weight, low friction, high speed, suitable for precision rotation in tiny spaces, and are therefore widely used in the Precision instruments, medical equipment, drones, robots, motors and various miniature transmission devices.
| Part Number | 6872Z |
| Reference From | FAG 6872Z |
| Bearing Type | Deep groove ball bearings 2Z design, self-retaining, Gap seals |
| Series | 68..-2Z |
| Sealing | 2Z = Gap seal on both sides |
| Cage | JN = Stamping steel cage |
| Radial internal clearances | CN |
| Heat stabilization | SN = (up to 120 °C) |
| Lubricant | L138 = Grease (L138) |
| Logistical code | HLC |
| Weight [lb] | 0.064 |
| Cr Radial Dynamic [lbf] | 254 |
| C0r Radial static [lbf] | 107 |
| Cur Radial Fatigue [lbf] | 3 |
| nG Limiting speed [rpm] | 57967 |
| Operating temperature - T(min) [°C] | -30 |
| Operating temperature - T(max) [°C] | 120 |
| d φ Inside [inch] | 0.276 |
| D Φ Outside [inch] | 0.551 |
| B Width [inch] | 0.197 |
| d2 [inch] | 0.335 |
| D2 [inch] | 0.500 |
| r(min.) [inch] | 0.006 |
| Mounting dimensions | |
| da(min.) [inch] | 0.307 |
| Da(max.) [inch] | 0.520 |
| ra(max.) [inch] | 0.006 |
| Coefficient - F0 [inch] | 14.2 |
The 6872Z Miniature ball bearings primarily consist of thin-walled inner and outer rings (precision machined), tiny steel balls (typically less than 3mm in diameter), and a cage (stamped steel or one-piece plastic). The most common type is the deep groove ball bearing, available in open, dust-covered, or sealed configurations, with inner diameters typically ranging from 1mm to 10mm.
Miniature ball bearings are small and lightweight, making them suitable for extremely compact spaces. They offer high rotational accuracy, reaching P4 level or higher, with smooth operation and low frictional torque. They exhibit significant low noise and low vibration characteristics, and some models feature a dustproof design to effectively prevent the intrusion of tiny particles, resulting in a long service life.
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