List of symbols
| Symbol | Name of the symbol | Unit |
|---|---|---|
| $ $ | trapezoidal thread | $\mathrm{ }$ |
| $ $ | type of strut mounting | $\mathrm{ }$ |
| $C_c$ | coefficient according to load | $\mathrm{ }$ |
| $C_t$ | power screw coefficient | $\mathrm{ }$ |
| $D_1$ | minor diameter for internal threads | $\mathrm{mm}$ |
| $D_4$ | major diameter for internal threads | $\mathrm{mm}$ |
| $E$ | Young's modulus | $\mathrm{MPa}$ |
| $F_A$ | axial force | $\mathrm{N}$ |
| $F_{max}$ | maximal (critical) force | $\mathrm{N}$ |
| $H_1$ | height of the overlapping | $\mathrm{mm}$ |
| $H_4$ | height of internal threads | $\mathrm{mm}$ |
| $I$ | second moment of area | $\mathrm{mm^4}$ |
| $L$ | strut length | $\mathrm{mm}$ |
| $M_T$ | twisting moment | $\mathrm{Nm}$ |
| $M_T$ | lifting torque | $\mathrm{Nm}$ |
| $P$ | pitch | $\mathrm{mm}$ |
| $P_{B-screw-nut}$ | bearing stress in the screw and nut | $\mathrm{MPa}$ |
| $P_{all-B-nut}$ | allowable bearing stress the nut | $\mathrm{MPa}$ |
| $P_{all-B-screw}$ | allowable bearing stress the screw | $\mathrm{MPa}$ |
| $R_{1max}$ | dimension $ R_{1max} $ | $\mathrm{mm}$ |
| $R_{2max}$ | dimension $ R_{2max} $ | $\mathrm{mm}$ |
| $S$ | profile area | $\mathrm{mm^2}$ |
| $S_F$ | safety factor | $\mathrm{ }$ |
| $S_{FB}$ | safety factor buckling | $\mathrm{ }$ |
| $S_{y-nut}$ | the minimum yield strength of the nut | $\mathrm{MPa}$ |
| $S_{y-screw}$ | the minimum yield strength of the screw | $\mathrm{MPa}$ |
| $a_c$ | clearance on the crest | $\mathrm{mm}$ |
| $c$ | extreme fiber distance | $\mathrm{mm}$ |
| $d$ | major diameter for external thread (nominal diameter) | $\mathrm{mm}$ |
| $d_2$ | pitch diameter for external threads | $\mathrm{mm}$ |
| $d_3$ | minor diameter for external threads | $\mathrm{mm}$ |
| $e$ | eccentricity | $\mathrm{mm}$ |
| $h_3$ | height of external threads | $\mathrm{mm}$ |
| $i$ | gyration radius | $\mathrm{mm}$ |
| $l$ | length nut | $\mathrm{mm}$ |
| $n$ | speed | $\mathrm{rpm}$ |
| $v$ | screw speed | $\mathrm{m/s}$ |
| $z$ | dimension $ z $ | $\mathrm{mm}$ |
| $β$ | coefficient for buckling | $\mathrm{ }$ |
| $μ$ | friction coefficient | $\mathrm{ }$ |
| $σ_{A-screw}$ | axial stress in the screw | $\mathrm{MPa}$ |
| $σ_{all-A-screw}$ | allowable axial stress the screw | $\mathrm{MPa}$ |
| $σ_{all-C-screw}$ | allowable combined stress the screw | $\mathrm{MPa}$ |
| $σ_{tresca-screw}$ | combined stress in the screw | $\mathrm{MPa}$ |
| $τ_{S-screw}$ | shear stress in the screw | $\mathrm{MPa}$ |
| $τ_{all-S-screw}$ | allowable shear stress the screw | $\mathrm{MPa}$ |