Ngwongwo nchara ígwè bụ ụdị ihe eji eme ihe dị elu na otu ụdị ọkọlọtọ. A na-ejikarị ihe eji eme ihe eji arụ ọrụ ígwè iji jikọta njikọ njikọ nke efere ígwè. A na-ekewa usoro ihe eji eme ka ígwè rụọ ụdị ọkpụkpọ torsional nke ụdị ike dị elu na nnukwu hexagonal dị elu. Nnukwu ihe nkedo dị elu nke hexagonal dị na ọkwa dị elu nke kposara ndị nkịtị, ebe torsional shear type bolts dị elu bụ mmụba nke nnukwu hexagonal. Maka ịrụ ụlọ ka mma, a ga-ekwusi ike iji wuo ihe owuwu ígwè ma mechaa. N'ihi na mbu tightening nke ígwè Ọdịdị bolts, mmetụta ụdị electric wrenches ma ọ bụ torque kemeghi electric wrenches na-achọrọ. Ikpeazụ tightening nke ígwè Ọdịdị bolts nwere nlezianya chọrọ. Nkpuchi ikpeazụ nke torsional ụdị ụdị nchara ígwè ga-eji ụdị nkedo eletriki na-emegharị ihe, na njedebe ikpeazụ nke ụdị ụdị nchara ígwè ga-eji eriri igwe eletrik. Todị ụdị nchara nchara ụdị nke mejupụtara mejupụtara bolt, a nut, a ụdị torsional shear ụdị nnukwu ike bolt nchara ụdị nnukwu hexagonal bolt na a washer.