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Techno Linear Motion Catalog 18 Technical Information 4200 –––– 200 L = x 106 L = life expectancy expressed in number of revolutions Ca = dynamic load rating (N) [for acme nuts, see design load column         on catalog pages]. Fm = average axial load (N). Example: For 10 mm pitch screw,16 mm dia., Ca = 4200 N carrying an average axial load, Fm = 200 N (45 lbs.) the expected life is: L =                    x 106  = 9.261 x 109 revolutions. At an average of 1000 rpm this will result in:        x = 154,000 hours of expected operational life.  Note that the nature of the motion (jerky, smooth, etc.) will affect the life expectancy. BALL & ACME SCREW ASSEMBLY LIFE EXPECTANCY Ca –––– Fm 3 3 9.261 x 109 revolutions –––––––––––––––––– 1000 rpm 1 hour –––––––––– 60 minutes 16 mm LIFE EXPECTANCY Dynamic (Ca) Static Axial Load (N) Screw Dia. Pitch SPECIFICATIONS        2.5     4     5     5   10   10   20   20 AXIAL LOAD (N) 25 mm LIFE EXPECTANCY AXIAL LOAD (N) 16 16 16 25 16 25 16 25 3500 2600 4600 5100 4200 5100 1900 3570   5500   4200   7200 12600   6500 12600   2500   8800