济南Ductile iron bolt

公司秉承着诚信的服务理念，专注于Ductile iron bolt生产

硬铁螺栓：机械零件，cylindricalthreadedfastenerswithnuts.akindoffastenercomposedofheadandscrew(圆柱形外螺纹)，whichisusedtoconnecttwopartswiththroughhole.thiskindofconnectioniscalledboltconnection.ifthenutisunscrewedfromthebolt，(二次扫描)，sotheboltconnectionisadeacachableconnection。

Accordingtothestressmodeofconnection:commonandreamed.accordingtotheheadshape:hexagonalhead，圆头，方头，countersunkheadandsoon.thehexagonalheadiscommonlyused.generally，countersunkheadisusedwhereconnectionisrequired.

Theenglishnameofridingboltisu-bolt.itisanon-standardpart，和hapeisu形，soitisalsocalledu-bolt.therearethreadsatbothends，whichcanbecombinedwithnuts.itismainlyusedtofixtubularobjects，suchaswater pipiorfleces，suchasleafspringsofcars.becauseitswayoffixingobjectsislikeridingonahorse，itiscalledridingbolt.accordingtothethreadlength，itcanbepidedinto补漏和非富线。

根据螺纹轮廓，itcanbepidedintocoarsethreadandfinethread.thecoarsethreadprofileisnotshowninthemarkofbolt.accordingtotheperformancegrade，boltsarepidedinto8grades:3.6，4.8，5.6，6.8，8.8，9.8，10.9and12.9.boltsabovegrade8.8(包括级8.8)aremadeoflowcarbonalloysteelormediumcarbonsteelandheattreated(淬火和回火)，其名称为强度好螺栓，而螺栓低于8.8级(排除级8.8)

根据加工精度，普通螺栓，andgradecisroughbolts.forconnectingboltsusedinsteelstructure，，theyaregenerallycommonroughc-gradebolts.therearedifferencesintheprocessingmethodsofdifferentlevels，andthecorrespondingprocessingmethodsareasfollows:1theboltrodofgradeaandbboltsisprocessedbylathe，withsmoothsurfaceandaccuratesize.itsmaterialperformancegradeis8.8，及其生产和安装复杂，soitisrarelyused；2gradecboltsaremadeofrawroundsteel，尺寸不够准确，andthematerialpropertygradeisgrade4.6or4.8.shearconnectionhaslargedeformation，butitiseasytoinstallandhaslowproductioncost.itismostlyusedfortensileconnectionortemporaryfixationduringinstallation.

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