Ключевые слова: bolt, center, cheap, crisis, defect, depression, design, drilling, eventual, expectancy, fail, failure, fastener, faulty, fracture, frustrated, frustration, hole, industrial, industry, iron, life, maintenance, mechanical, metal, metallic, metalwork, nut, over, repetitive, replacement, risk, rotate, sad, safety, screw, shear, snap, steel, stress, stressed, support, tear, threaded, tighten, tired, torque, twist, twisted, wear,