不銹鋼螺絲的標注說明

    不銹鋼螺絲標注當螺紋精度要求較高時，除標注螺紋代號外，還應標注螺紋公差公差帶代號和螺紋旋合長度。 螺紋標記的標注格式為： 螺紋代號——螺紋公差帶代號（中徑、頂徑）——旋合長度
l）公差帶代號由數字加字母表示（內螺紋用大寫字母，外螺紋用小寫字母），如 7H、6g等，應特別指出，7H，6g等代表螺紋公差，而H7，g6代表圓柱體公差代號。
2）旋(xuan)(xuan)合長(chang)(chang)度(du)(du)(du)(du)規(gui)定為短（用S表(biao)(biao)(biao)示(shi)(shi)）、中(zhong)(zhong)（用N表(biao)(biao)(biao)示(shi)(shi)）、長(chang)(chang)（用L表(biao)(biao)(biao)示(shi)(shi)）三(san)種。一般情況下(xia)，不標(biao)(biao)注螺(luo)(luo)(luo)紋(wen)(wen)旋(xuan)(xuan)合長(chang)(chang)度(du)(du)(du)(du)，其螺(luo)(luo)(luo)紋(wen)(wen)公(gong)(gong)(gong)差(cha)(cha)(cha)帶(dai)(dai)按中(zhong)(zhong)等旋(xuan)(xuan)合長(chang)(chang)度(du)(du)(du)(du)（N）確定。必要時(shi)(shi)，可加注旋(xuan)(xuan)合長(chang)(chang)度(du)(du)(du)(du)代號(hao)(hao)(hao)S或L，如“ M20-5g6g－L”。特(te)殊需(xu)要時(shi)(shi)，可注明(ming)旋(xuan)(xuan)合長(chang)(chang)度(du)(du)(du)(du)的數值，如“M20-5g6g－30”。 普(pu)通螺(luo)(luo)(luo)紋(wen)(wen) 普(pu)通粗(cu)牙(ya)(ya)螺(luo)(luo)(luo)紋(wen)(wen)：特(te)征代號(hao)(hao)(hao)M+ 公(gong)(gong)(gong)稱(cheng)(cheng)直(zhi)徑(jing)+旋(xuan)(xuan)向+螺(luo)(luo)(luo)紋(wen)(wen)公(gong)(gong)(gong)差(cha)(cha)(cha)帶(dai)(dai)代號(hao)(hao)(hao)（中(zhong)(zhong)徑(jing)、頂徑(jing)）——旋(xuan)(xuan)合長(chang)(chang)度(du)(du)(du)(du) 普(pu)通細(xi)牙(ya)(ya)螺(luo)(luo)(luo)紋(wen)(wen)：特(te)征代號(hao)(hao)(hao)M+ 公(gong)(gong)(gong)稱(cheng)(cheng)直(zhi)徑(jing)*螺(luo)(luo)(luo)距+旋(xuan)(xuan)向+螺(luo)(luo)(luo)紋(wen)(wen)公(gong)(gong)(gong)差(cha)(cha)(cha)帶(dai)(dai)代號(hao)(hao)(hao)（中(zhong)(zhong)徑(jing)、頂徑(jing)）——旋(xuan)(xuan)合長(chang)(chang)度(du)(du)(du)(du) 右旋(xuan)(xuan)螺(luo)(luo)(luo)紋(wen)(wen)省(sheng)略(lve)不注，左旋(xuan)(xuan)用“ LH”表(biao)(biao)(biao)示(shi)(shi)。 M 16－5g6g表(biao)(biao)(biao)示(shi)(shi)粗(cu)牙(ya)(ya)普(pu)通螺(luo)(luo)(luo)紋(wen)(wen)，公(gong)(gong)(gong)稱(cheng)(cheng)直(zhi)徑(jing)16，右旋(xuan)(xuan)，螺(luo)(luo)(luo)紋(wen)(wen)公(gong)(gong)(gong)差(cha)(cha)(cha)帶(dai)(dai)中(zhong)(zhong)徑(jing) 5g，大徑(jing) 6g，旋(xuan)(xuan)合長(chang)(chang)度(du)(du)(du)(du)按中(zhong)(zhong)等長(chang)(chang)度(du)(du)(du)(du)考慮。 M16×1 LH－6G表(biao)(biao)(biao)示(shi)(shi)細(xi)牙(ya)(ya)普(pu)通螺(luo)(luo)(luo)紋(wen)(wen)，公(gong)(gong)(gong)稱(cheng)(cheng)直(zhi)徑(jing)16，螺(luo)(luo)(luo)距1，左旋(xuan)(xuan)，螺(luo)(luo)(luo)紋(wen)(wen)公(gong)(gong)(gong)差(cha)(cha)(cha)帶(dai)(dai)中(zhong)(zhong)徑(jing)、大徑(jing)均為6G，旋(xuan)(xuan)合長(chang)(chang)度(du)(du)(du)(du)按中(zhong)(zhong)等長(chang)(chang)度(du)(du)(du)(du)考慮。 管螺(luo)(luo)(luo)紋(wen)(wen)的標(biao)(biao)注 格式為：特(te)征代號(hao)(hao)(hao)（圓柱管螺(luo)(luo)(luo)紋(wen)(wen)用G表(biao)(biao)(biao)示(shi)(shi)，圓錐(zhui)管螺(luo)(luo)(luo)紋(wen)(wen)用NPT表(biao)(biao)(biao)示(shi)(shi)）+ 尺(chi)寸代號(hao)(hao)(hao)+公(gong)(gong)(gong)差(cha)(cha)(cha)等級代號(hao)(hao)(hao)+旋(xuan)(xuan)向 G1A--LH表(biao)(biao)(biao)示(shi)(shi)英制(zhi)(zhi)非螺(luo)(luo)(luo)紋(wen)(wen)密封管螺(luo)(luo)(luo)紋(wen)(wen)，尺(chi)寸代號(hao)(hao)(hao)1in，右旋(xuan)(xuan)，公(gong)(gong)(gong)差(cha)(cha)(cha)等級為A級。 Rcl／2表(biao)(biao)(biao)示(shi)(shi)英制(zhi)(zhi)螺(luo)(luo)(luo)紋(wen)(wen)密封錐(zhui)管螺(luo)(luo)(luo)紋(wen)(wen)，尺(chi)寸代號(hao)(hao)(hao)1／2in，右旋(xuan)(xuan)。