Qib Dub Oxide Ob-End Studs 

Qib 8.8 dub oxide ob-kawg studs yog nruab nrab-siab zog threaded fasteners featuring threading ntawm ob hnub nrog ib tug unthreaded shank center. Lawv ua ke txhim khu kev qha txhua yam kev ua tau zoo (800 MPa tensile lub zog), kev tiv thaiv kev tiv thaiv corrosion ntawm nyias Fe3O4 hloov dua siab tshiab txheej, thiab ntau yam kev teeb tsa rau kev siv tshuab, tsheb, thiab kev siv cov qauv.

1. Qib 8.8 Kev faib tawm

Raws li ISO 898-1, "8.8" kev xaiv txhais tau hais tias lub zog tensile ntawm 800 MPa thiab cov txiaj ntsig ntawm 0.8 (yield zog 640 MPa). Ua los ntawm quenched-thiab-tempered nruab nrab carbon alloy steel, Qib 8.8 muaj qhov zoo tshaj plaws lub zog-rau-tus nqi sib npaug.

Table 1 - Cov Cuab Yeej Tseem Ceeb (ISO 898-1)

2. Dub Oxide Deg Kev Kho Mob

Dub oxide (Fe3O4) yog cov tshuaj hloov pauv txheej txheej 0.5-1.5 micrometers tuab, tsim los ntawm immersion hauv ib da dej kub alkaline nitrate ntawm 140-150C. Tsis zoo li electroplating, nws ua rau tsis muaj qhov hloov pauv thiab tsis muaj hydrogen embrittlement. Thaum kaw nrog cov roj tiv thaiv xeb, nws muab txog li 96 teev ntawm cov tshuaj tsw qab ntsev.

Table 2 - Dub Oxide Txheej Khoom

3. Ob-End Stud Tsim

Ib tug ob-kawg stud muaj ib tug kais kawg (screwed rau hauv ib tug tapped lub qhov) thiab ib tug txiv ntseej kawg ( txais ib tug txiv ntoo), sib cais los ntawm ib tug unthreaded shank. Lub kais kawg ntev yog feem ntau 1.0-1.5d thiab cov txiv ntseej kawg 2.0-3.0d, qhov twg d yog qhov nominal txoj kab uas hla.