safety safety brake safety nut sand paper saw scale scale scrap scraper screw screw screw cap screw nut screw plug screwdriver screw pump sealing ring seat section security switch seize seizing system selector semiautomatic sequence service switch servocylinder servomotor servovalve set screw set out at a right angle shaft sharpening shifting spanner shock-absorber short circuit shot shotblasting machine side and face mill sign signal silencer simple effect cylinder skid shoe sledge slide slide slide caliper sliding pulley slot slot mill slotting slotting machine smooth softening spacer spanner speed speed variator spindle nose spindle pitch compensation spindle pitch error spinning spool spring washer square stabilize stabilizer stainless steel standard starting up steel stiffness straightedge strap strength strength stress stroke stud suction filter supply voltage support surface marble surface plate swallow tail sweeper swing synchronism