Power Screw Ball Screw Specs: square_thread
Lead screw and ball screw specifications including diameter, lead, starts, efficiency, dynamic/static load capacity, max speed, backlash, accuracy class, and L10 life — covers acme, buttress, square thread, ball screw, and planetary roller screw types from 3/8-in to 4-in nominal diameter
| screw type | size key | accuracy class | backlash in (in) | critical speed rpm at 24in unsupported (rpm) | drag torque in lb (in·lbf) | dynamic load capacity lb (lbf) | efficiency pct (%) | lead in (in) | max PV factor | max speed rpm (rpm) | nominal diameter in (in) | notes | pitch in (in) | preload type | root diameter in (in) | starts | static load capacity lb (lbf) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| square_thread | 0.7500#0.2500#commercial#none | commercial | 0.015 | 1,350 | 1.8 | 2,800 | 50 | 0.25 | 3,500 | 900 | 0.75 | Square thread; highest efficiency; lowest thread strength; difficult to manufacture | 0.25 | none | 0.625 | 1 | 4,200 |
| square_thread | 1.0000#0.2500#commercial#none | commercial | 0.015 | 1,050 | 2.5 | 5,500 | 52 | 0.25 | 3,500 | 800 | 1 | 1-in square thread; 4 TPI; reference design only | 0.25 | none | 0.84 | 1 | 8,250 |
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