锁紧螺母，是一种广泛应用于机械等行业的常见螺母。
螺母的工作原理是采用螺母和螺栓之间的摩擦力进行自锁的。但是在动载荷中这种自锁的可靠性就会降低。在一些重要的场合我们就会采取一些防松措施，保证螺母锁紧的可靠性。锁紧螺母就是其中的一种防松措施。
锁紧螺母的防松效果优劣主要取决于螺母与螺栓啮合螺纹之间相互作用力。目前提高啮合螺纹之间相互作用力的方式有很多种，比如施必牢螺母的螺纹结构改良，尼龙螺母的尼龙增糙，螺纹的表面处理等。
km锁紧螺母规格是
锁紧螺母 GB9160.3-88
型号基本尺寸（mm）重量(kg)
螺纹Dd2Bbh
KM00M10X0.75184320.005
KM01M12X1224320.007
KM02M15X1255420.010
KM03M17X1285420.013
KM04M20X1326420.019
KM05M25X1.5387520.025
KM06M30X1.5457520.043
KM07M35X1.5528520.053
KM08M40X1.558962.50.085
KM09M45X1.5651062.50.119
KM10M50X1.5701162.50.148
KM11M55X27511730.158
KM12M60X28011730.174
KM13M65X28512730.203
KM14M70X2921283.50.242
KM15M75X2981383.50.287
KM16M80X21051583.50.397
KM17M85X21101683.50.451
KM18M90X2120161040.556
KM19M95X2125171040.658
KM20M100X2130181040.698
KM21M105X2140181250.845
KM22M110X2145191250.965
KM23M115X2150191251.01
KM24M120X2155201251.08
KM25M125X2160211251.19
KM26M130X2165211251.25
KM27M135X2175221461.55
KM28M140X2180221461.56
KM29M145X2190241462.00
KM30M150X2195241462.03
KM31M155X3200251672.21
KM32M160X3210251672.43
KM33M165X3210261672.59
KM34M170X3220261672.80
KM36M180X3230271883.07
KM38M190X3240281883.39
KM40M200X4250291883.69
KM44Tr220X42803220105.20
KM48Tr240X43003420105.95
KM52Tr260X43303624128.08