BASIC THREADING
NOMINAL SIZE

NO OF THREADS PER INCH

BASIC DIAMETERS AT GAUGE PLANE

GAUGE LENGTH

LENGTH OF USEFUL THREAD ON PIPE END NOT LESS THEN

 FITTING ALLOWANCE WRENCHING ALLOWANCE TOLERANCE ON POSITION OF GUAGE PLANE RELATIVE TO FACE OF INTERNALLY TAPER THREADED PARTS (PLUS AND MINUS)

DIAMETRAL TOLERANCE ON PARALLEL INTERNAL THREADS (PLUS AND MINUS)

MAJOR(GUAGE DIA)

PITCH

 MINOR

BASIC

 TOLERANCE PLUS AND MINUS MAX. MIN.

FOR BASIC GUAGE LENGTH

 FOR MAX. GUAGE LENGTH(SEE NOTE 2) FOR MIN. GUAGE LENGTH(SEE NOTE 2)
1/16 28

0.304

 0.2812 0.2583

4 3/8
0.1563

1
0.0357 		5 3/8
0.1920 		3 3/8
0.1206 		7 1/8
0.2545 		8 1/8
0.2902 		6 1/8
0.2188 		2 3/4
0.0982 		1 1/2
0.0536 		1 1/4
0.0446 		0.0028
1/8 28

0.383

0.3601

 0.3372

4 3/8
0.1563

1
1.0357 		5 3/8
0.1920 		3 3/8
0.1206 		7 1/8
0.2545		 8 1/8
0.2902 		6 1/8
0.2188 		2 3/4
0.0982 		1 1/2
0.0536		 1 1/4
0.0446		 0.0028
1/4 19

0.518

0.4843

 0.4506

4 1/2
0.2367

 1
0.0 526		 5 1/2
0.2893 		3 1/2
0.1841 		7 1/4
0.3814 		8 1/4
0.4340 		6 1/4
0.3288 		2 3/4
0.1447 		1 1/2
0.0789
1 1/4
0.0658 		0.0041
3/8 19

0.656

 0.6223 0.5886

4 3/4
0.2500

1
0.0526 		5 3/4
0.3026 		3 3/4
0.1974 		7 1/2
0.3947 		8 1/2
0.4473 		6 1/2
0.3421 		2 3/4
0.1447		 1 1/2
0.0789 		1 1/4
0.0658 		0.0041
1/2 14

0.825

0.7793

 0.7336

4 1/2
0.3214

1
0.0714 		5 1/2
0.3928 		3 1/2
0.2500 		7 1/4
0.5178 		8 1/4
0.5892 		6 1/4
0.4464 		2 3/4
0.1964 		1 1/2
0.1071		 1 1/4
0.0893 		0.0056
3/4 14 1.041 0.9953 0.9496 5 1/4
0.3750
 1
0.714 		6 1/4
0.4464		 4 1/4
0.3036 		8
0.5715 		9
0.6428 		7
0.5000 		2 3/4
0.1964		 1 1/2
0.1071		 1 1/4
0.0893		 0.0056
1 11 1.309 1.2508 1.1926 4 1/2
0.4091		 1
0.0909 		5 1/2
0.5000 		3 1/2
0.3182 		7 1/4
0.6591 		8 1/4
0.7500 		6 1/4
0.5682 		2 3/4
0.2500 		1 1/2
0.1364 		1 1/4
0.1136 		0.0071
1 1/4 11 1.650 1.5918 1.5336 5 1/2
0.5000 		1
0.0909 		6 1/2
0.5909 		4 1/2
0.4091		 8 1/4
0.7500 		9 1/4
0.8409 		7 1/4
0.6591 		2 3/4
0.2500 		1 1/2
0.1364 		1 1/4
0.1136 		0.0071
1 1/2 11 1.882 1.8238 1.7656 5 1/2
0.5000		 1
0.0909 		6 1/2
0.5909 		4 1/2
0.4091		 8 1/4
0.7500 		9 1/4
0.8409 		7 1/4
0.6591 		2 3/4
0.2500 		1 1/2
0.1364 		1 1/4
0.1136 		0.0071
2 11 2.347 2.2888 2.2306 6 7/8
0.6250 		1
0.0909 		7 7/8
0.7159 		5 7/8
0.5341		 10 1/8
0.9204 		11 1/8
1.0113		 9 1/8
0.8295 		3 1/4
0.2954 		2
0.1818 		1 1/4
1.1136 		0.0071
2 1/2 11 2.960 2.9018 2.8436 7 9/16
0.6875 		1 1/2
0.1364 		9 1/16
0.8239 		6 1/16
0.5511		 11 9/16
1.0511 		13 1/16
1.1875 		10 1/16
0.9147 		4
0.3636 		2 1/2
0.2273 		1 1/2
0.1364 		0.0085
3 11 3.460 3.4018 3.3436 8 15/16
0.8125 		1 1/2
0.1364 		10 7/16
0.9489 		7 7/16
0.6761		 12 15/16
1.1761 		14 7/16
1.3125 		11 7/16
1.0397		 4
0.3636 		2 1/2
0.2273 		1 1/2
0.1364 		0.0085
4 11 4.450 4.3918 4.3336 11
1.0000 		1 1/2
0.1364 		12 1/2
1.1364 		9 1/2
0.8636 		15 1/2
1.4091 		17
1.5455 		14
1.2727 		4 1/2
0.4091 		3
0.2727
1 1/2
0.1364 		0.0085
5 11 5.450 5.3918 5.3336 12 3/8
1.1250 		1 1/2
0.2364 		13 3/8
1.2614 		10 7/8
0.9886 		17 3/8
1.5795 		18 7/8
1.7159 		15 7/8
1.4431 		5
0.4545 		3 1/2
0.3182 		1 1/2
0.1364 		0.0085
6 11

6.450

 6.3918 6.3336

12 3/8
1.1250

1 1/2
0.12614 		13 7/8
1.2614 		10 7/8
0.9886 		17 3/8
1.5795 		18 7/8
1.7159 		15 7/8
1.4431 		5
0.4545		 3 1/2
0.3182 		1 1/2
0.1364 		0.0085
 
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