Anyị bụ ụlọ ọrụ mmepụta ihe dị na Ningbo, China; E hiwere ụlọ ọrụ anyị na 2003.
Anyị nwere ike na-emepụta High ike hex bolt ISO4014/4017, DIN931/933, ezi pitch DIN960/961 Gr8.8 10.9 12.9, ANSI UNC & UNF Gr5, Gr8; sọket okpu kposara ISO4762,DIN912 Gr8.8 10.9 12.9; Heavy hex bolt EN14399,DIN6914,STM A325,ASTM A325M,A490, stud bolts A193 B7 &2H nuts;
Hex nuts DIN934, plain washer DIN125, mmiri washer DIN127
Nọmalị, anyị nwere ike na-enye samples n'efu n'ime 7 ụbọchị ma ọ bụrụ na Anyị nwere ndị nha na ngwaahịa.
Ọ dabere na ọnụọgụ na nha. Nọmalị oge nnyefe anyị bụ ụbọchị 30-60 mgbe ịnatachara nkwụnye ego ahụ.
Ihe nkwụnye ụgwọ anyị: Nọmalị, anyị chọrọ nkwụnye ego 30%, 70% megide nnomi B / L
Anyị nwekwara ike ịnakwere D/P, L/C na anya.
Anyị ga-emepụta ngwaahịa dị ka nkwekọrịta okwu, na-enyocha onye ọ bụla nza tupu Mbupu, e wezụga, anyị na-n'omume maka onye ọ bụla size tupu Mbupu, Ọ bụrụ na anyị na-ekwu banyere àgwà si ahịa, anyị ga-eziga samples na iri atọ ọzọ maka nnyocha. Ọ bụrụ n'ezie nsogbu anyị, anyị nwere ike ịkwụghachi gị.
Anyị nwere ike ibu nnukwu katọn, akpa akpa, obere igbe. Ọ bụrụ na ị nwere arịrịọ pụrụ iche gbasara mbukota, anyị nwere ike kparịta.