Threads and Threading - Sportpilot.info
Threads and Threading - Sportpilot.info
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Table 8c. Limiting Dimensions of American National St<strong>and</strong>ard Centralizing Acme Single-Start Screw <strong>Threads</strong>,<br />
Classes 2C, 3C, <strong>and</strong> 4C ASME/ANSI B1.5-1988<br />
Nominal Diameter, D 1 3 ⁄ 4 2 2 1 ⁄4 2 1 ⁄ 2 2 3 ⁄ 4 3 3 1 ⁄21 2 4 4 1 ⁄2 5<br />
<strong>Threads</strong> per Inch a 4 4 3 3 3 2 2 2 2 2<br />
Limiting Diameters External <strong>Threads</strong><br />
Classes 2C, 3C, <strong>and</strong> 4C, Major Diameter Max 1.7500 2.0000 2.2500 2.5000 2.7500 3.0000 3.5000 4.0000 4.5000 5.0000<br />
Class 2C, Major Diameter Min 1.7454 1.9951 2.2448 2.4945 2.7442 2.9939 3.4935 3.9930 4.4926 4.9922<br />
Class 3C, Major Diameter Min 1.7480 1.9979 2.2478 2.4976 2.7475 2.9974 3.4972 3.9970 4.4968 4.9966<br />
Class 4C, Major Diameter Min 1.7487 1.9986 2.2485 2.4984 2.7483 2.9983 3.4981 3.9980 4.4979 4.9978<br />
Classes 2C, 3C, <strong>and</strong> 4C, Minor Diameter Max 1.4800 1.7300 1.8967 2.1467 2.3967 2.4800 2.9800 3.4800 3.9800 4.4800<br />
Class 2C, Minor Diameter Min 1.4456 1.6948 1.8572 2.1065 2.3558 2.4326 2.9314 3.4302 3.9291 4.4281<br />
Class 3C, Minor Diameter Min 1.4640 1.7136 1.8783 2.1279 2.3776 2.4579 2.9574 3.4568 3.9563 4.4558<br />
Class 4C, Minor Diameter Min 1.4685 1.7183 1.8835 2.1333 2.3831 2.4642 2.9638 3.4634 3.9631 4.4627<br />
Class 2C, Pitch Diameter {<br />
Max<br />
Min<br />
1.6145<br />
1.5916<br />
1.8637<br />
1.8402<br />
2.0713<br />
2.0450<br />
2.3207<br />
2.2939<br />
2.5700<br />
2.5427<br />
2.7360<br />
2.7044<br />
3.2350<br />
3.2026<br />
3.7340<br />
3.7008<br />
4.2330<br />
4.1991<br />
4.7319<br />
4.6973<br />
Class 3C, Pitch Diameter {<br />
Max<br />
Min<br />
1.6171<br />
1.6064<br />
1.8665<br />
1.8555<br />
2.0743<br />
2.0620<br />
2.3238<br />
2.3113<br />
2.5734<br />
2.5607<br />
2.7395<br />
2.7248<br />
3.2388<br />
3.2237<br />
3.7380<br />
3.7225<br />
4.2373<br />
4.2215<br />
4.7364<br />
4.7202<br />
Class 4C, Pitch Diameter {<br />
Max<br />
Min<br />
1.6198<br />
1.6122<br />
1.8693<br />
1.8615<br />
2.0773<br />
2.0685<br />
2.3270<br />
2.3181<br />
2.5767<br />
2.5676<br />
2.7430<br />
2.7325<br />
3.2425<br />
3.2317<br />
3.7420<br />
3.7309<br />
4.2415<br />
4.2302<br />
4.7409<br />
4.7294<br />
Internal <strong>Threads</strong><br />
Classes 2C, 3C, <strong>and</strong> 4C, Major Diameter Min 1.7513 2.0014 2.2515 2.5016 2.7517 3.0017 3.5019 4.0020 4.5021 5.0022<br />
Classes 2C <strong>and</strong> 3C, Major Diameter Max 1.7559 2.0063 2.2567 2.5071 2.7575 3.0078 3.5084 4.0090 4.5095 5.0100<br />
Class 4C, Major Diameter Max 1.7539 2.0042 2.2545 2.5048 2.7550 3.0052 3.5056 4.0060 4.5063 5.0067<br />
Classes 2C, 3C, <strong>and</strong> 4C,<br />
Minor Diameter {<br />
Machinery's H<strong>and</strong>book 27th Edition<br />
Min 1.5250 1.7750 1.9500 2.2000 2.4500 2.5500 3.0500 3.5500 4.0500 4.5500<br />
Max 1.5375 1.7875 1.9667 2.2167 2.4667 2.5750 3.0750 3.5750 4.0750 4.5750<br />
Class 2C, Pitch Diameter {<br />
Min<br />
Max<br />
1.6250<br />
1.6479<br />
1.8750<br />
1.8985<br />
2.0833<br />
2.1096<br />
2.3333<br />
2.3601<br />
2.5833<br />
2.6106<br />
2.7500<br />
2.7816<br />
3.2500<br />
3.2824<br />
3.7500<br />
3.7832<br />
4.2500<br />
4.2839<br />
4.7500<br />
4.7846<br />
Class 3C, Pitch Diameter {<br />
Min<br />
Max<br />
1.6250<br />
1.6357<br />
1.8750<br />
1.8860<br />
2.0833<br />
2.0956<br />
2.3333<br />
2.3458<br />
2.5833<br />
2.5960<br />
2.7500<br />
2.7647<br />
3.2500<br />
3.2651<br />
3.7500<br />
3.7655<br />
4.2500<br />
4.2658<br />
4.7500<br />
4.7662<br />
Class 4C Pitch Diameter {<br />
Min<br />
Max<br />
1.6250<br />
1.6326<br />
1.8750<br />
1.8828<br />
2.0833<br />
2.0921<br />
2.3333<br />
2.3422<br />
2.5833<br />
2.5924<br />
2.7500<br />
2.7605<br />
3.2500<br />
3.2608<br />
3.7500<br />
3.7611<br />
4.2500<br />
4.2613<br />
4.7500<br />
4.7615<br />
a All other dimensions are in inches. The selection of threads per inch is arbitrary <strong>and</strong> for the purpose of establishing a st<strong>and</strong>ard.<br />
Copyright 2004, Industrial Press, Inc., New York, NY<br />
CENTRALIZING ACME SCREW THREADS 1839
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