Table 8c. Limiting Dimensions of American National Standard Centralizing Acme Single-Start Screw Threads, Classes 2C, 3C, and 4C ANSI/ASME B1.5-1997 (R2014) Nominal Diameter, D 1 3 ∕ 4 2 2 1 ∕ 4 2 1 ∕ 2 2 3 ∕ 4 3 3 1 ∕ 2 4 4 1 ∕ 2 5 Threads per Inch a 4 4 3 3 3 2 2 2 2 2 Limiting Diameters External Threads
Classes 2C, 3C, and 4C, Major Diameter
Max Min Min Min Max Min Min Min Max Min Max Min Max Min Min Max Max Min Max Min Max Min Max Min Max
1.7500 1.7454 1.7480 1.7487 1.4800 1.4456 1.4640 1.4685 1.6145 1.5916 1.6171 1.6064 1.6198 1.6122 1.7513 1.7559 1.7539 1.5250 1.5375 1.6250 1.6479 1.6250 1.6357 1.6250 1.6326
2.0000 1.9951 1.9979 1.9986 1.7300 1.6948 1.7136 1.7183 1.8637 1.8402 1.8665 1.8555 1.8693 1.8615 2.0014 2.0063 2.0042 1.7750 1.7875 1.8750 1.8985 1.8750 1.8860 1.8750 1.8828
2.2500 2.2448 2.2478 2.2485 1.8967 1.8572 1.8783 1.8835 2.0713 2.0450 2.0743 2.0620 2.0773 2.0685 2.2515 2.2567 2.2545 1.9500 1.9667 2.0833 2.1096 2.0833 2.0956 2.0833 2.0921
2.5000 2.4945 2.4976 2.4984 2.1467 2.1065 2.1279 2.1333 2.3207 2.2939 2.3238 2.3113 2.3270 2.3181 2.5016 2.5071 2.5048 2.2000 2.2167 2.3333 2.3601 2.3333 2.3458 2.3333 2.3422
2.7500 2.7442 2.7475 2.7483 2.3967 2.3558 2.3776 2.3831 2.5700 2.5427 2.5734 2.5607 2.5767 2.5676 2.7517 2.7575 2.7550 2.4500 2.4667 2.5833 2.6106 2.5833 2.5960 2.5833 2.5924
3.0000 2.9939 2.9974 2.9983 2.4800 2.4326 2.4579 2.4642 2.7360 2.7044 2.7395 2.7248 2.7430 2.7325 3.0017 3.0078 3.0052 2.5500 2.5750 2.7500 2.7816 2.7500 2.7647 2.7500 2.7605
3.5000 3.4935 3.4972 3.4981 2.9800 2.9314 2.9574 2.9638 3.2350 3.2026 3.2388 3.2237 3.2425 3.2317 3.5019 3.5084 3.5056 3.0500 3.0750 3.2500 3.2824 3.2500 3.2651 3.2500 3.2608
4.0000 3.9930 3.9970 3.9980 3.4800 3.4302 3.4568 3.4634 3.7340 3.7008 3.7380 3.7225 3.7420 3.7309 4.0020 4.0090 4.0060 3.5500 3.5750 3.7500 3.7832 3.7500 3.7655 3.7500 3.7611
4.5000 4.4926 4.4968 4.4979 3.9800 3.9291 3.9563 3.9631 4.2330 4.1991 4.2373 4.2215 4.2415 4.2302 4.5021 4.5095 4.5063 4.0500 4.0750 4.2500 4.2839 4.2500 4.2658 4.2500 4.2613
5.0000 4.9922 4.9966 4.9978 4.4800 4.4281 4.4558 4.4627 4.7319 4.6973 4.7364 4.7202 4.7409 4.7294 5.0022 5.0100 5.0067 4.5500 4.5750 4.7500 4.7846 4.7500 4.7662 4.7500 4.7615
Class 2C, Major Diameter Class 3C, Major Diameter Class 4C, Major Diameter Class 2C, Minor Diameter Class 3C, Minor Diameter Class 4C, Minor Diameter Class 2C, Pitch Diameter
Classes 2C, 3C, and 4C, Minor Diameter
{
Class 3C, Pitch Diameter
{
Class 4C, Pitch Diameter
{
Internal Threads
Classes 2C, 3C, and 4C, Major Diameter Classes 2C and 3C, Major Diameter
Class 4C, Major Diameter Classes 2C, 3C, and 4C, Minor Diameter
{
Class 2C, Pitch Diameter
{
Class 3C, Pitch Diameter
{
Class 4C Pitch Diameter
{
a All other dimensions are in inches. The selection of threads per inch is arbitrary and for the purpose of establishing a standard.
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