Power Screw Ball Screw Specs: buttress
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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| buttress | 1.0000#0.2500#commercial#none | commercial | 0.02 | 1,050 | 3 | 6,300 | 45 | 0.25 | 3,500 | 800 | 1 | Buttress thread; 7°/45° flanks; better axial load efficiency than ACME | 0.25 | none | 0.86 | 1 | 9,500 |
| buttress | 1.5000#0.3330#commercial#none | commercial | 0.025 | 800 | 6.5 | 13,500 | 47 | 0.333 | 3,500 | 650 | 1.5 | 1.5-in Buttress; 3 TPI; aerospace jack screw application | 0.333 | none | 1.306 | 1 | 20,250 |
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