2024普通螺纹牙型

普通螺纹牙型PAGEPAGE1普通螺纹牙型范围本文件规定了普通螺纹（一般用途米制螺纹M）的基本牙型和设计牙型。本文件适用于一般用途的机械紧固螺纹联接。规范性引用文件（包括所有的修改单适用于本文件。GB/T14791螺纹术语(GB/T14791-2013，ISO5408:2009，IDT)术语和定义GB/T14791界定的术语和定义适用于本文件。代号下列代号适用于本文件。D内螺纹大径（公称直径d外螺纹大径（公称直径D2 内螺纹中径d2 外螺纹中径D1 内螺纹小径d1 基本牙型上的外螺纹小d3 设计牙型上的外螺纹小P螺距H 原始三角形高度H1 内螺纹牙高，同时还是h3 设计牙型上的外螺纹牙高R 设计牙型上外螺纹全圆弧牙底的圆弧半径R1 设计牙型上外螺纹牙底拐角局部圆弧的圆弧半径基本牙型基本牙型见图1中的粗实线。内、外螺纹的基本牙型相同。基本牙型尺寸数值列于表1。基本牙型尺寸按下列公式计算，计算结果修约至小数点后第六位。H=30.5P/2=0.866025404PH1=5H/8=0.541265877P3H/8=0.324759526PH/4=0.216506351PH/8=0.108253175P标引序号说明：1——螺纹轴线。图1 基本牙型表1 基本牙型尺寸单位为毫米螺距PHH1(5H/8)3H/8H/4H/80.20.1732050.1082530.0649520.0433010.0216510.250.2165060.1353160.0811900.0541270.0270630.30.2598080.1623800.0974280.0649520.0324760.350.3031090.1894430.1136660.0757770.0378890.40.3464100.2165060.1299040.0866030.0433010.450.3897110.2435700.1461420.0974280.0487140.50.4330130.2706330.1623800.1082530.0541270.60.5196150.3247600.1948560.1299040.0649520.70.6062180.3788860.2273320.1515540.0757770.750.6495190.4059490.2435700.1623800.0811900.80.6928200.4330130.2598080.1732050.08660310.8660250.5412660.3247600.2165060.1082531.251.0825320.6765820.4059490.2706330.1353161.51.2990380.8118990.4871390.3247600.1623801.751.5155440.9472150.5683290.3788860.18944321.7320511.0825320.6495190.4330130.2165062.52.1650641.3531650.8118990.5412660.27063332.5980761.6237980.9742790.6495190.3247603.53.0310891.8944311.1366580.7577720.37888643.4641022.1650641.2990380.8660250.4330134.53.8971142.4356961.4614180.9742790.48713954.3301272.7063291.6237981.0825320.5412665.54.7631402.9769621.7861771.1907850.59539265.1961523.2475951.9485571.2990380.64951986.9282034.3301272.5980761.7320510.866025设计牙型内、外螺纹的设计牙型不同，分别见图2和图3中的粗实线。设计牙型尺寸数值列于表2。设计牙型尺寸按下列公式计算，外螺纹牙高计算值修约至小数点后R13=1/24=0.6343466PR==0.14434P1＜0.1434PP/8H11。P4H/6削平高度位置。牙底形状为以下两种类型之一：R3a；R3bR10.125P。注：圆弧牙底降低了螺纹刀具牙顶的磨损率，提高了外螺纹的抗疲劳强度。标引序号说明：1——内螺纹图2 内螺纹设计牙型标引序号说明：1——外螺纹图3 外螺纹设计牙型表2 设计牙型尺寸单位为毫米螺距Ph3(17H/24)R0.14434PR1minP螺距Ph3(17H/24)R0.14434PR1minP0.20.1226870.0290.0251.50.9201520.2170.1880.250.1533590.0360.0311.751.0735110.2530.2190.30.1840300.0430.03821.2268690.2890.2500.350.2147020.0510.0442,51.5335870.3610.3130.40.2453740.0580.05031.8403040.4330.3750.450.2760460.0650.0563.52.1470210.5050.4380.50.3067170.0720.06342.4537390.5770.5000.60.3680610.0870.0754.52.7604560.6500.5630.70.4294040.1010.08853.0671730.7220.6250.750.4600760.1