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Home Products Steel Pipes & Tubes M.S. Pipes Indian Standard IS: 554: 1999

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Indian Standard IS: 554: 1999

Thread Dimensions as per IS : 554 : 1994 ISO 7-1: 1994 (Dimensions in millimeters)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Designation of
thread size
Number of thread
in 25.4 mm
  Diameters at gauge plane Gauge length (external thread) Tolerance on position of
gauge plane on internal thread
Length of useful
external thread not less than
Fitting allowance Diametral
tolerance 1 on parallel
internal threads
Pitch Height
of thread
Major
(gauge diameter)
Pitch Minor Nominal Tolerance
± T1/2
max min Tolerance
± T1/2
For nominal
gauge length
For maximum
gauge length
For minimum
gauge length
     
    P h d d2 d1   2) Turns
of thread
2) Turns
of
thread
2) Turns
of thread
1/16 28 0.907 0.581 7.723 7.142 6.561 4 0.9 1 4.9 3.1 1.1 6.5 7.4 5.6 2.5 2 ¾ ± 0.071
1/8 28 0.907 0.581 9.728 9.728 8.566 4 0.9 1 4.9 3.1 1.1 6.5 7.4 5.6 2.5 2 ¾ ± 0.071
1/4 19 1.337 0.856 13.157 13.157 11.445 6 1.3 1 7.3 4.7 1.7 9.7 11 8.4 3.7 2 ¾ ± 0.104
 
3/8 19 1.337 0.856 16.662 16.662 15.806 6.4 1.3 1 7.7 5.1 1.7 10.1 11.4 8.8 3.7 2 ¾ ± 0.104
1/2 14 1.814 1.162 20.955 19.793 18.631 8.2 1.8 1 10.0 6.4 2.3 13.2 15 11.4 5.0 2 ¾ ± 0.142
3/4 14 1.814 1.162 26.441 25.279 24.117 9.5 1.8 1 11.3 7.7 2.3 14.5 16.3 12.7 5.0 2 ¾ ± 0.142
 
1 11 2.309 1.479 33.249 31.770 30.291 10.4 2.3 1 12.7 8.1 2.9 16.8 19.1 14.5 6.4 2 ¾ ± 0.180
11 2.309 1.479 41.010 40.431 38.952 12.7 2.3 1 15.0 10.4 2.9 19.1 21.4 16.8 6.4 2 ¾ ± 0.180
11 2.309 1.479 47.803 40.324 44.845 12.7 2.3 1 15.0 10.4 2.9 19.1 21.4 16.8 6.4 2 ¾ ± 0.180
 
2 11 2.309 1.479 59.614 58.135 56.656 15.9 2.3 1 18.2 13.6 2.9 23.4 25.7 21.1 7.5 3 ¼ ± 0.180
11 2.309 1.479 75.184 73.705 72.226 17.5 3.5 21.0 14.0 3.5 26.7 30.2 23.2 9.2 4 ± 0.216
3 11 2.309 1.479 87.884 86.405 84.926 20.6 3.5 24.1 17.1 3.5 29.8 33.3 26.3 9.2 4 ± 0.216
 
4 11 2.309 1.479 113.030 111.551 110.072 25.4 3.5 28.9 21.9 3.5 35.8 39.3 32.3 10.4 4 ½ ± 0.216
5 11 2.309 1.479 138.430 136.951 135.472 28.6 3.5 32.1 25.1 3.5 40.1 43.6 36.6 11.5 5 ± 0.216
6 11 2.309 1.479 163.830 162.51 160.872 28.6 3.5 32.1 25.1 3.5 40.1 43.6 36.6 11.5 5 ± 0.216

NOTE: The main dimensions were converted into millimeters on the basis of 1inch =25.4mm, beginning with the number of threads per inch, which determines the pitch P, the formula h (the height of thread) = 0.640 327 P and then major diameter at the gauge plane. Pitch diameter and minor diameter were then compiled by subtracting once or twice respectively the height of thread h iron from the major diameter. 

The nominal gauge length, the tolerances and the fitting were directly computed. The remaining lengths given in above table were obtained by subtracting or adding the tolerances or fitting allowance respectively to the nominal gauge length. Tolerances and fitting allowance are expressed in millimeters and in turns of thread.

1) For parallel internally threaded parts the diametral tolerances are derived from the tolerances in column 14 by multiplying with corresponding pitch in column 3 and with 1/16, the amount of taper.
2) Informative tolerances, in millimeters, are obtained from the mandatory values in turns of thread by multiplying with the corresponding pitch in column 3 and rounding to the nearest 0.1 mm.

 

Tolerance on outside Diameter, Wall Thickness, Weight & Length of Pipe

ASTM Std. A53 Welded Steel Pipes and Seamless Steel Pipes
Available Sizes ( Dimensions and Weights)

NPS Designator Outside Diameter Wall thickness Weight Class Schedule No. Weight
In mm In mm Lb / ft Kg/ft Kg/m
8 8.625 219.1 0.188 4.78 - - 16.94 7.69 25.26
0.203 5.16 - - 18.26 8.29 27.22
0.219 5.56 - - 19.66 8.93 29.28
0.250 6.35 - 20 22.36 10.15 33.31
0.277 7.04 - 30 24.70 11.21 36.31
0.312 7.92 - - 27.70 12.58 41.24
0.322 8.18 STD 40 28.55 12.96 42.55
0.344 8.74 - - 30.42 13.81 45.34
0.375 9.52 - - 33.04 15.00 49.20
0.406 10.31 - 60 35.64 16.18 53.08
0.438 11.13 - - 38.30 17.39 57.08
0.500 12.70 XS 80 43.39 19.70 64.64
0.594 15.09 - 100 50.95 23.13 75.92
0.719 18.26 - 120 60.71 27.56 90.44
0.812 20.62 - 140 67.76 30.76 100.92
0.875 22.22 XXS - 72.42 32.88 107.88
0.906 23.01 - 160 74.69 33.91 111.27
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New Delhi-110048 (INDIA)

+91-11-41637397, +91-11-29221350

DIRECTOR
Sushil Goyal: +91-9810004581

 

 

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+91-120-2896306,  +91-120-2896302