强度区分最小破断强度材质螺栓M14M16M18M20M22M24M27M30M33M36M39M42M45M48M52M56M60M64M68M72M76M80M85M90M100M110M120M125对边2224273032364146505560657075808590951001051101151201301451551751804.8级40㎏/m㎡一般构造用钢SS41（生）N.m㎏.m69798101371417718226233143244145588607057598110014771201520155176518022562302746280353036040214105001510568858046726607355750814083088269001059110801372914001637716701990720306.8级60㎏/m㎡机械构造用钢S35C（烧）N.m㎏.m98101371420621275283333447148637658839011281151471150176518023542402746280343235041194205198530598261074537608532870980710001078711001225612501372914001618116502010420502500725502991030508.8级80㎏/m㎡铬钼合金SCM3（烧）N.m137206284402539686103012261471176521572746313839234707598277478826107871265114710181422206524517表中数据×（70～80）%
螺栓扭矩参照表（8.8级）螺栓直径螺帽对边mmmmM2436M2741对应摩擦系数所需扭矩Nm螺栓预紧力KNf=0.15（油基）f=0.2（无）1596219882109131470M30M33M36M39M42M45M48M52M56M60M64M68M72M80M90M100M110M125462555031955374604516551770606756808081985944901105951250100143510516331151870130242414530501552960180389410.9+40%12.9+70%表中数据×（70～80）%11771592206726463386409649336347786098101176014387169352127230809428104601268230198327003510459057007080851611005135901757120400248122968537468545407609580348125540外六角内六角螺栓和对应扳手尺寸对照表
公制外六角螺栓和套筒（梅花）扳手对边尺寸对照表：螺栓尺寸mmM3M4M5M6M8M10M12M14M16M18M20M22对应扳手或套筒对边尺寸mm5.5781013（14）16（17）18（19）21（22）24273034M2436注：括号中的尺寸为GB旧标准尺寸。公制内六角螺钉（注意不是螺栓）与内六角扳手尺寸对照表：内六角螺对应内六角扳栓尺寸手尺寸mmmmM32.5M43M54M65M86M108M1210M1412M1614M1814M2017M2217M2419M3022M3627M4232M4836M5641M64464707
8.8级㎏/m㎡钼合金钢M3（烧）㎏.m14242941557010512515018022028032040048061079090011001290150018502250250012.9级120㎏/m㎡镍铬钼合金钢SNCM（特）N.m㎏.m22623353364814967769912931177120176518023542402452250294230036283704609470539455066696808336850102971050132391350
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