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1、精品文档55圆柱管螺纹的型式和尺寸每英寸小径外螺纹d3大径 mmd=Dmm螺距p牙型高度H1底孔尺寸mm中径 mmd2=D2螺纹代号基本尺寸牙数 tpi1/89.1470.581G 1/89.7280.907288.5668.7G 1/413.1571.3371912.30111.44511.61/40.856G 3/83/816.6621.3371915.80614.950.85615G 1/21/220.9551.8141419.79318.6311.16219G 5/85/822.9111.8141421.74920.5871.16220.75G 3/43/426.4411.814142
2、5.27924.1171.16224.5G 7/87/830.2011.8141429.03927.8771.16228G 1133.2492.3091131.7730.2911.47930.5G 1 1/81 1/837.8972.3091136.41834.9391.47935G 1 1/41 1/441.912.3091140.43138.9521.47939.5G 1 3/81 3/844.3232.3091142.84441.3651.47941.5G 1 1/21 1/247.8032.3091146.32444.8451.47945G 1 3/41 3/453.7462.3091
3、152.26750.7881.47951G 2259.6142.3091158.13556.6561.47957G 2 1/42 1/465.712.3091164.23162.7521.47963G 2 1/22 1/275.1842.3091173.70572.2261.47972.5G 2 3/42 3/481.5342.3091180.05578.5761.47979G 3387.8842.3091186.40584.9261.47985.G 3 1/43 1/493.982.3091192.50191.0221.47991G 3 1/23 1/2100.332.3091198.351
4、97.3721.47997.75G 3 3/43 3/4106.682.30911105.201103.7221.479104G 44113.032.30911111.55110.0721.479110.5G 4 1/24 1/2125.732.30911124.251122.7721.479123G 55138.432.30911136.951135.4721.479136精品文档精品文档G 5 1/25 1/2151.132.30911149.651148.1721.479148.5G 66163.832.30911162.351160.8721.479161.5精品文档精品文档55圆锥管
5、螺纹的型式和尺寸小径大径 mmd=D螺距 mmp中径 mmd2=D2每英寸牙数 tpi牙型高度H1圆弧尺寸底孔尺寸螺纹代号基本尺寸外螺纹d3rmmR 1/16R 1/81/161/87.7239.7280.9070.90728287.1429.1476.5618.5660.5810.5810.1250.1256.48.4R 1/4 R 3/8R 1/21/43/81/213.15716.66220.9551.3371.3371.81419191412.30115.80619.79311.44514.95018.6310.8560.8561.1620.1840.1840.24911.214.75
6、18.25R 3/4R 13/4126.44133.2491.8142.309141125.27931.7724.11730.2911.1621.4790.2490.31723.7530R 1 1/41 1/441.9102.3091140.43138.9521.4790.31738.5R 1 1/2R 21 1/2247.80359.6142.3092.309111146.32458.13544.84556.6561.4791.4790.3170.31744.556R 2 1/22 1/275.1842.3091173.70572.2261.4790.31771R 3R 43487.8841
7、13.0302.3092.309111186.405111.55184.926110.0721.4791.4790.3170.31785.5110.5R 55138.4302.30911136.951135.4721.4790.317136R 66163.8302.30911162.351160.8721.4790.317161.51、密封管螺纹（R）密封管螺纹不加填料或密封质就能防止渗漏；用密封管螺纹内螺纹有圆锥、圆柱两种形式，外螺纹只有圆锥一种形式；精品文档精品文档协作方式：英制密封管螺纹有两种协作方式：圆柱内螺纹与圆锥外螺纹组成“柱 /锥”协作；圆锥内螺纹与圆锥外螺纹组成“锥/锥”协作；
8、欧洲国家主要采纳 “柱 /锥”协作螺纹； 而欧洲以外国家就主要采纳“锥/锥”协作螺纹；RP；标记：英制密封圆柱内螺纹的特点代号为：RC；英制密封圆锥内螺纹的特点代号为：英制密封圆锥外螺纹的特点代号为：R1（与英制密封圆柱内螺纹协作使用）；R2（与英制密封圆锥内螺纹协作使用）；RP/R1 ，RC/R2 分别表示“柱 /锥” 和“锥 /锥”螺对密封管螺纹，利用纹副；2、非密封管螺纹非密封管螺纹主要用于压力较低的水管、煤气管道，连接时就加填料或密封质（麻丝、铅丹、聚四氟乙烯胶带等），以防止渗漏标记；非密封管螺纹不论内外螺纹都只有圆柱螺纹一种形式；G （例 G1/4）英制非密封圆柱螺纹的特点代号为：当表示英制非密封管螺纹的螺纹副时，仅标注外螺纹的标记代号；加工内孔螺纹的是管螺纹丝锥，加工外螺纹的有板牙；留意：两种管螺纹部分规格的公差不同（密封管螺纹精度更高）；非螺纹密封的圆柱内螺纹可以和用螺纹密封的圆锥外螺纹相连接，但非螺纹密封的圆柱外螺纹却不行以和用螺纹密封的圆锥内螺纹形成用螺纹密封的连接；精品文档精品文档精品文档
