Description Low-cost Linear Bushing for high requirements Steel bearing plates with machined ball guide grooves and optimized ball lead-in chamfers for outstandingly smooth travel and a long service life Without self-alignment feature for transferring lower tipping force along the axial direction Open Linear Bushing on fully supported shafts for applications where other linear guides tend to warp due to imprecise substructures. High travel speed (5 m/s) Features With longitudinal seal Integrated wiper seals, external seals or no wiper seals Ball retainer and outer sleeve made of PA or POM Balls made of rolling bearing steel No initial lubrication Technical data General technical data Ø d mm 12 16 20 25 30 40 50 amax m/s² 150 vmax 1) m/s 3 m kg 0.018 0.022 0.051 0.102 0.155 0.3 0.48 FR 2) N 0.8 3 1 4 1.5 5 2 6 2.5 8 3 10 4 12 Breakaway force 3) N 1.5 6 2 9 3 10 4.5 14 6 18 8 24 10 30 μ 4) 01 ... 025 Rows of balls 4 5 Shaft radial clearance h6/bore H7 µm + 38 + 10 + 43 + 11 + 50 + 12 Shaft radial clearance h6/bore K7 µm + 23 - 5 + 25 - 7 + 29 - 9 Shaft radial clearance h6/bore M7 µm + 17 - 11 + 18 - 14 + 20 - 18 Operating conditions Permissible ambient temperature (min ... max) -10 °C ... +80 °C 1) Speeds of up to 5 m/s possible. Service life is limited by heightened wear to plastic parts. Tests have shown total travel from 50 • 105 m to 100 • 105 m without failure. 2) Frictional drags generated by Linear Bushings with integrated wiper seals on two sides when not under radial load. The frictional drags depend on speed and lubrication. 3) One wiper seal: Multiply by a factor of 0.5. 4) Friction coefficients of unsealed Linear Bushings when lubricated with oil. The friction coefficient is lowest under heavy load, but can still be above the specified value even under a low load. Load capacities and load moments Ød mm 12 16 20 25 30 40 50 C 1) N 1060 1500 2570 4130 5020 8620 12500 C0 1) N 510 830 1180 2250 2880 4480 6620 1) The load ratings apply for the main direction of loading. The load ratings are based on a total travel of 100, 00 m. When based on 50 000 m, the values in the table need to be multiplied by 1.26. Legend Symbol Description Unit Ød Shaft diameters mm amax Maximum acceleration travel m/s2 C Dynamic load capacity N C0 Static load capacity N FR Friction force N m Mass kg vmax Maximum permissible speed m/s μ Friction coefficient For load in the direction of opening, please refer to the loading diagrams (see "Diagrams" section). Impact of load direction on load rating of open Linear Bushings The load ratings C and C0 apply for the main direction of loading ρ = 0°. For all other load directions, the load ratings must be multiplied by the factors fρ (dynamic load rating C) or fρ0 (static load rating C0). Installing specific Linear Bushings can prevent reductions in load capacity (see Linear Set with side opening). Reduced load capacity with short stroke In case of short stroke, the service life of the shaft is less than that of the super Lin
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