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美制螺纹标准对照表

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美制螺纹标准对照表

美制外螺纹（2A）常用规格极限尺寸表（粗牙）

公称尺寸和

每英寸牙数螺纹系

列代号大径极限中径极限小径max螺胚直径

最小最大最小最大最小最大 󰀁

8-32

UNC0.15710.16310.13990.14280.12483.583.61(0.164-32) 3.99034.14273.55353.62713.1699

10-240.18180.18900.15860.16190.13794.074.10(0.190-24)4.61774.80064.02844.11233.5027

12-240.20780.21500.18450.18790.16394.724.75(0.216-24)5.27815.46104.68634.77274.1631

1/4-200.24080.24890.21270.21640.18765.455.48(0.250-20)6.11636.32215.40265.49664.7650

5/16-180.30260.31130.27120.27520.24316.946.98(0.3175-18)7.68607.90706.88856.99016.1747

3/8-160.36430.37370.32870.33310.29708.408.44(0.375-16)9.25329.49208.34908.46077.5438

7/16-140.42580.43610.38500.38970.34859.839.87(0.4375-14)10.815311.07699.77909.89848.8519

1/2-130.48760.49850.44350.44850.404111.3411.38(0.50-13)12.385012.661911.264911.391910.2641

9/16-120.54950.56090.50160.50680.458712.8012.84(0.5625-12)13.957314.246912.740612.872711.6510

5/8-110.61130.62340.55890.56440.511914.2714.32(0.625-11)15.527015.834414.196114.335813.0023

3/4-100.73530.74820.67730.68320.625517.2817.33(0.750-10)18.676619.004317.203417.353315.8877

7/8-90.85920.87310.79460.80090.736820.2720.32(0.875-9)21.823722.176720.182820.342918.7147

1"-80.98300.99800.91000.91680.844623.2223.27(1.000-8)24.968225.349223.114023.286721.4528

1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。

2.标记示例：10-24UNC-2A(或0.190-24UNC-2A)、3/8-16UNC-2A(或0.375-16UNC-2A)

（注：表中上行斜体数值单位为英寸，下行为毫米）ｓｈｅｎｍｅ

8-36

UNF0.15770.16320.14240.14520.12913.653.67(0.164-36)4.00564.14533.61703.68813.2791

10-320.18310.18910.16580.16880.15084.244.27(0.190-32)4.65074.80314.21134.28753.8303

12-280.20850.21500.18860.19180.17124.824.85(0.216-28)5.29595.46104.79044.87174.3485

1/4-280.24250.24900.22250.22580.20525.695.71(0.250-28)6.15956.32465.65155.73535.2121

5/16-240.30420.31140.28060.28430.26037.177.20(0.3175-24)7.72677.90967.12727.22126.6116

3/8-240.36670.37390.34300.34680.32288.758.78(0.375-24)9.31429.49718.71228.80878.1991

7/16-200.42810.43620.39950.40370.374910.1910.23(0.4375-20)10.873711.079510.147310.25409.5225

1/2-200.49060.49870.46190.46620.437411.7811.82(0.50-20)12.461212.667011.732311.841511.1100

9/16-180.55240.56110.52050.52500.492913.2713.31(0.5625-18)14.031014.251913.220713.335012.5197

5/8-180.61490.62360.58280.58750.555414.8514.89(0.625-18)15.618515.839414.803114.922514.1072

3/4-160.73910.74850.70290.70790.671817.9117.95(0.750-16)18.773119.011917.853717.980717.0637

7/8-140.86310.87340.82160.82700.785820.9320.97(0.875-14)21.922722.184420.868621.005819.9593

1"-120.98680.99820.93820.94410.896023.9023.95(1.000-12)25.064725.354323.830323.980122.7584

1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。

2.标记示例：10-32UNF-2A(或0.190-32UNF-2A)、3/8-24UNF-2A(或

0.375-24UNF-2A)美制外螺纹（2A）常用规格极限尺寸表（细牙）

公称尺寸和

每英寸牙数螺纹系

列代号大径极限中径极限小径max螺胚直径

最小最大最小最大最小最大10-240.14500.15600.16290.16720.19003.753.90(0.190-24)3.68303.96244.13774.24694.8260

12-240.17100.18100.18890.19330.21604.404.55(0.216-24)4.34344.59744.79814.90985.4864

1/4-200.19600.20700.21750.22240.25005.055.20(0.250-20)4.97845.25785.52455.64906.3500

5/16-180.25200.26500.27640.28170.31256.456.60(0.3175-18)6.40086.73107.02067.15527.9375

3/8-160.30700.32100.33440.34010.37507.858.00(0.375-16)7.79788.15348.49388.63859.5250

7/16-140.36000.37600.39110.39720.43759.209.40(0.4375-14)9.14409.55049.933910.088911.1125

1/2-130.41700.43400.45000.45650.500010.6510.90(0.50-13)10.591811.023611.430011.595112.7000

9/16-120.47200.49000.50840.51520.562512.0512.30(0.5625-12)11.988812.446012.913413.086114.2875

5/8-110.52700.54600.56600.57320.625013.4513.70(0.625-11)13.385813.868414.376414.559315.8750

3/4-100.64200.66300.68500.69270.750016.4016.70(0.750-10)16.306816.840217.399017.594619.0500

7/8-90.75500.77800.80280.81100.875019.3019.60(0.875-9)19.177019.761220.391120.599422.2250

1"-80.86500.89000.91880.92761.000022.1022.40(1.000-8)21.971022.606023.337523.561025.4000

1.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。

2.标记示例：10-24UNC-2B(或0.190-24UNC-2B)、3/8-16UNC-2B(或0.375-16UNC-2B)美制内螺纹（2B）常用规格极限尺寸表（粗牙）

公称尺寸和每

英寸牙数螺纹

系列

代号小径极限中径极限

大径min底孔直径

最小最大最小最大最小最大

8-32UNC0.13000.13900.14370.14750.16403.403.50(0.164-32)3.30203.53063.65003.74654.16565/16-240.26700.27700.28540.29020.31256.857.20(0.3175-24)6.78187.03587.24927.37117.9375

3/8-240.33000.34000.34790.35280.37508.458.78(0.375-24)8.38208.63608.83678.96119.5250

7/16-200.38300.39500.40500.41040.43759.8510.23(0.4375-20)9.728210.033010.287010.424211.1125

1/2-200.44600.45700.46750.47310.500011.4011.82(0.50-20)11.328411.607811.874512.016712.7000

9/16-180.50200.51500.52640.53230.562512.8513.31(0.5625-18)12.750813.081013.370613.520414.2875

5/8-180.56500.57800.58890.59490.625014.4514.89(0.625-18)14.351014.681214.958115.110515.8750

3/4-160.68200.69600.70940.71590.750017.4017.95(0.750-16)17.322817.678418.018818.183919.0500

7/8-140.79800.81400.82860.83560.875020.3520.97(0.875-14)20.269220.675621.046421.224222.2250

合集下载

美规螺丝常见规格与标示

美规螺丝常见规格与标示

美规螺丝常见规格与标示

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分类：* 点击：5786 相关：美规螺丝常见规格与标示

美规螺丝

a.一般以番号标示, 如 #2-56, #4-40, #6-32, #8-32, #10-24…etc.

b.或以英制外径表示,

如0.086-56, 0.112-40 , 0.138-32 , 0.164-32 , 0.190-24…etc.

Ex: 632 – 8 – P P B:

Finish Code: 外观处理规格

Head Code: 头部外型

Drive Code: 头部剖沟,特征型号

Length Code: 螺丝长度

Thread Code: 螺丝型号

B-1: Thread Code: 螺丝型号

一般常用规格如下:

a. #2-56 (0.086-56): 2 番 56 牙

b #4-40 (0.112-40) : 4 番40 牙

c. #6-32 (0.138-32) : 6 番32 牙

d. #8-32 (0.164-32) : 8 番 32 牙

e. #10-24 (0.190-24): 10 番 24 牙

***牙为每吋之牙数.***

B-2: Length Code: 螺丝长度

美规螺丝长度须经换算, 才是公制mm 尺寸.

换算公式: (Length Code / 32) x 25.40 = 公制长度mm

B-3, B-4,B-5 : 标示方式与公制相同.

Number Cap Screws

Screw

Size Decimal

Equiv. Hex

Key Screw Head

Counterbore Countersink

Diam, 60°

(in) Clearance

Drills

美制螺纹标准对照表

美制螺纹标准对照表

美制螺纹标准对照表

美制外螺纹（2A）常用规格极限尺寸表（粗牙）

公称尺寸和每英寸牙数 螺纹系列代号 大径极限 中径极限 小径max 螺胚直径

最小 最大 最小 最大 最小 最大

8-32

UNC 0.1571 0.1631 0.1399 0.1428 0.1248 3.58 3.61 (0.164-32) 3.9903 4.1427 3.5535 3.6271 3.1699

10-24 0.1818 0.1890 0.1586 0.1619 0.1379 4.07 4.10 (0.190-24) 4.6177 4.8006 4.0284 4.1123 3.5027

12-24 0.2078 0.2150 0.1845 0.1879 0.1639 4.72 4.75 (0.216-24) 5.2781 5.4610 4.6863 4.7727 4.1631

1/4-20 0.2408 0.2489 0.2127 0.2164 0.1876 5.45 5.48 (0.250-20) 6.1163 6.3221 5.4026 5.4966 4.7650

5/16-18 0.3026 0.3113 0.2712 0.2752 0.2431 6.94 6.98 (0.3175-18) 7.6860 7.9070 6.8885 6.9901 6.1747

3/8-16 0.3643 0.3737 0.3287 0.3331 0.2970 8.40 8.44 (0.375-16) 9.2532 9.4920 8.3490 8.4607 7.5438

7/16-14 0.4258 0.4361 0.3850 0.3897 0.3485 9.83 9.87 (0.4375-14) 10.8153 11.0769 9.7790 9.8984 8.8519

1/2-13 0.4876 0.4985 0.4435 0.4485 0.4041 11.34 11.38 (0.50-13) 12.3850 12.6619 11.2649 11.3919 10.2641

英美制特制螺纹对照表

英美制特制螺纹对照表

英美制特制螺纹对照表(附图)

英制美制迫牙丝攻钻孔径对照表图

美制螺纹和英制管螺纹对照表

英制美制联合螺纹和英美美联细螺纹对照表

英制螺纹规格和公制螺纹规格对照表

6g 外螺纹大径 6H 内螺纹小径

序号 规格型号 最大 最小 公差 最大 最小 公差

1 M10*1 9.974 9.794 0.180 9.157 8.917 0.240

2 M12*1.5 11.968 11.732 0.236 10.676 10.376 0.300

3 M14*1.5 13.968 13.732 0.236 12.676 12.376 0.300

4 M16*1.5 15.968 15.732 0.236 14.676 14.376 0.300

5 M18*1.5 17.968 17.732 0.236 16.676 16.376 0.300

6 M20*1.5 19.968 19.732 0.236 18.676 18.376 0.300

7 M22*1.5 21.968 21.732 0.236 20.676 20.376 0.300

8 M24*1.5 23.968 23.732 0.236 22.676 22.376 0.300

9 M26*1.5 25.968 25.732 0.236 24.676 24.376 0.300

10 M27*1.5 26.968 26.732 0.236 25.676 25.376 0.300

11 M30*1.5 29.968 29.732 0.236 28.676 28.376 0.300

12 M27*2 26.962 26.682 0.280 25.210 24.835 0.375 13 M30*2 29.962 29.682 0.280 28.210 27.835 0.375

14 M33*2 32.962 32.682 0.280 31.210 30.835 0.375

美制螺纹标准对照表 2

美制螺纹标准对照表 2

美制螺纹标准对照表

美制外螺纹（2A）常用规格极限尺寸表（粗牙）

公称尺寸和每英寸牙数 螺纹系列代号 大径极限 中径极限 小径max 螺胚直径

最小 最大 最小 最大 最小 最大

8-32

UNC 0.1571 0.1631 0.1399 0.1428 0.1248 3.58 3.61 (0.164-32) 3.9903 4.1427 3.5535 3.6271 3.1699

10-24 0.1818 0.1890 0.1586 0.1619 0.1379 4.07 4.10 (0.190-24) 4.6177 4.8006 4.0284 4.1123 3.5027

12-24 0.2078 0.2150 0.1845 0.1879 0.1639 4.72 4.75 (0.216-24) 5.2781 5.4610 4.6863 4.7727 4.1631

1/4-20 0.2408 0.2489 0.2127 0.2164 0.1876 5.45 5.48 (0.250-20) 6.1163 6.3221 5.4026 5.4966 4.7650

5/16-18 0.3026 0.3113 0.2712 0.2752 0.2431 6.94 6.98 (0.3175-18) 7.6860 7.9070 6.8885 6.9901 6.1747

3/8-16 0.3643 0.3737 0.3287 0.3331 0.2970 8.40 8.44 (0.375-16) 9.2532 9.4920 8.3490 8.4607 7.5438

7/16-14 0.4258 0.4361 0.3850 0.3897 0.3485 9.83 9.87 (0.4375-14) 10.8153 11.0769 9.7790 9.8984 8.8519

1/2-13 0.4876 0.4985 0.4435 0.4485 0.4041 11.34 11.38 (0.50-13) 12.3850 12.6619 11.2649 11.3919 10.2641