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Multi-Rifled Seamless Cold Drawn Boiler Tubes For Power Generation and Energy Industry

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Improved Boiler Efficiency

Rifled tubes are used in heat exchangers and boilers to provide highly energy efficient means of heat transfer. The presence of the internal rifling induces centrifugal forces in the mass flow thereby separating the water from the steam fraction and forcing the water towards the tube wall. As a result of this phenomenon and the increase in internal surface the following advantages accrue:

  • Improved heat transfer rate even at higher steam quality levels
  • Very good heat transfer even at low mass flux levels
  • Reduction in mean metal temperature of the tube wall
  • Ability to increase heat transfer rate by optimizing rifling geometry

Specification And Grades

Rifle Tubes can be supplied against ASTM, ASME, A/SA 192, 209, 210 and 213 specifications and all associated grades.

Tubes can be supplied against equivalent specifications like EN 10216, DN 17175, BS 3059, JIS 3461 ,3462.

Tubes can be supplied to bath A and B type profiles.Detailed dimensions for each profile are given in the table.

FULL RANGE OF MATERIALIS

We manufacture tubes in every possible boiler grade steels. All our steel is melted in-house through electric arc furnace route, than is ladle refined, 100% vacuum degassed, continuous cast and rolled.

APPROVALS

ISMT is ISO 14001, ISO/TS 16949:2002, and OHSAS 18001 approved. In addition we hold approvals from all major national and international official authorities, customers, and third party certification agencies.

Customized Rifle Geometries

As described above the heat transfer rate can be optimized by varying the rifling geometry based on operation conditions. In addition to the standard rifle tubes (covered in this brochure), ISMT manufactures rifled tubes to suit any customized geometry and in all boiler steel grades. We regularly manufacture and deliver such customized solutions at short notice.

ASSURED QUALITY

With over 25 years of experience in the production of precision seamless tubes for the Powergen industry we can guarantee the quality of all our tubes. The entire production process, the melting of steel, the manufacture of the hot-finished tube, the cold drawing, and the final heat treatment to obtain the desired metallurgical properties is carried out in-house. Each and every tube is then ultrasonically and/or eddy current tested to ensure quality.

ISMT - Multi-Rifled Tubes Collapse Content

O.D(mm) 28.58 to 40.64 to 50.80 to 63.50 to 76.20
a(mm)   0.15   0.20   0.25   0.30  
O.D.(in) 1.125 to 1.600 to 2.000 to 2.50 to 3.000
a(in.)   0.006   0.008   0.010   0.012  

 

Item Value Tolerances
A Tubes outsider diameter - - a a
B Major inside diameter B=A-(1.11*D*2) B=A-(1.11*D*2) a a
C Min. inside diameter - - - -
D Min.wall thickness -      
E Number of ribs - - - -
F Rib width at the top(circumferiential) 4.78 mm 0.188 in. Nominal value Nominal value
H Specified rib height     +/-0.30 mm +/-0.012 in.
K Rib side angle (both sides of the rib) 55o 55o +/-15o +/-15o
L Rib radius (top and bottom of the rib) form 0.4 to 2 mm 1/64 to 5/64 in.    
M Pitch(rib lead) -   +/-3.18 mm +/-0.125 in.
N Lead     +/-3.18 * E mm +/-0.125 * E in.
P Lead angle 30o 30o Nominal value Nominal value
S Rib width at top(longitudinal) 8.28 mm 0.326 in. +/-1.27 mm +/-0.050 in.

 

O
U
T
S
I
D
E

D
I
A
M
E
T
E
R		   Minimum Wall
Thickness		 Major
I.D		 Major I.D RIB height Lead Mean Weight Flow Section Wet Internal
Perimeter
  mm in.   mm in. mm in. mm in. Kg/m Lb/ft mm2 Sq in. mm in.
31.75mm
1.250 in.		 3.96 0.156 6 22.85 0.904 0.88 0.035 124.9 4.918 3.18 2.137 387 0.612 79.30 3.18
4.19 0.165 6 22.45 0.884 0.88 0.035 122.1 4.809 3.32 2.232 369 0.584 77.60 3.11
4.57 0.180 6 21.60 0.850 0.87 0.034 117.5 4.624 3.55 2.384 340 0.538 74.90 3.00
38.10mm
1.500 in.		 4.19 0.165 6 28.80 1.134 0.96 0.038 156.7 6.169 4.07 2.735 622 0.977 98.20 3.93
4.70 0.185 6 27.67 1.089 0.94 0.037 150.5 5.924 4.46 2.996 572 0.899 94.65 3.78
5.08 0.200 6 26.82 1.056 0.93 0.037 145.9 5.745 4.74 3.185 536 0.844 91.80 3.67
42.28mm
1.625 in.		 4.19 0.165 6 31.97 1.259 1.00 0.039 173.9 6.849 4.44 2.987 772 1.211 108.50 4.34
4.65 0.183 6 30.96 1.219 0.98 0.039 168.4 6.631 4.84 3.249 722 1.133 105.20 4.21
5.08 0.200 6 30.00 1.181 0.97 0.038 163.2 6.425 5.19 3.489 677 1.062 102.10 4.08
5.59 0.220 6 28.87 1.137 0.96 0.038 157.1 6.185 5.60 3.762 625 0.982 98.40 3.94
44.45mm
1.750in.		 4.19 0.165 6 35.15 1.384 1.04 0.041 191.2 7.529 4.82 3.239 938 1.468 118.80 4.74
4.57 0.180 6 34.30 1.350 1.03 0.040 186.6 7.344 5.18 3.480 892 1.396 116.10 4.63
5.08 0.200 6 33.17 1.306 1.01 0.040 180.5 7.105 5.64 3.793 833 1.305 112.40 4.49
5.59 0.220 6 32.05 1.262 1.00 0.039 174.5 6.865 6.09 4.095 775 1.216 108.70 4.35
6.10 0.240 6 30.92 1.217 0.98 0.039 168.2 6.620 6.53 4.387 720 1.129 105.10 4.20
47.63mm
1.875in.		 4.57 0.180 8 37.48 1.475 1.06 0.042 203.9 8.024 5.67 3.811 1059 1.660 129.20 5.17
5.08 0.200 8 36.35 1.431 1.05 0.041 197.7 7.785 6.18 4.154 994 1.560 125.50 5.03
5.59 0.220 6 35.22 1.387 1.04 0.041 191.6 7.545 6.59 4.428 942 1.475 119.00 4.75
6.10 0.240 6 34.09 1.342 1.02 0.040 185.5 7.300 7.07 4.750 881 1.379 115.40 7.61
6.60 0.260 6 32.96 1.298 1.01 0.040 179.3 7.061 7.53 5.061 822 1.288 111.70 4.46
50.80mm
2.000in.		 5.08 0.200 8 39.52 1.556 1.08 0.042 215.0 8.465 6.63 4.457 1182 1.851 135.80 5.44
5.59 0.220 8 38.40 1.512 1.07 0.042 208.9 8.225 7.17 4.819 1113 1.746 132.10 5.29
6.10 0.240 8 37.27 1.467 1.06 0.042 202.7 7.980 7.69 5.170 1047 1.641 128.50 5.15
6.60 0.260 8 36.14 1.423 1.05 0.041 196.6 7.741 8.20 5.511 982 1.542 124.80 5.00
53.98mm
2.125in.		 5.59 0.220 8 41.57 1.637 1.10 0.043 226.1 8.905 7.67 5.152 1311 2.054 142.40 5.70
6.10 0.240 8 40.44 1.592 1.09 0.043 220.0 8.660 8.23 5.533 1239 1.940 138.80 5.55
6.60 0.260 8 39.31 1.548 1.08 0.042 213.9 8.421 8.78 5.903 1169 1.832 135.10 5.41
7.11 0.280 8 38.19 1.503 1.07 0.042 207.7 8.176 9.32 6.263 1101 1.725 131.50 5.26
57.58mm
2.250in.		 5.59 0.220 8 44.75 1.762 1.12 0.044 243.4 9.585 8.16 5.485 1525 2.386 152.70 6.11
6.10 0.240 8 43.62 1.717 1.11 0.044 237.3 9.340 8.77 5.895 1448 1.263 149.00 5.96
6.60 0.260 8 42.69 1.673 1.10 0.043 231.1 9.101 9.37 6.295 1372 2.147 145.40 5.82
7.11 0.280 8 41.36 1.628 1.09 0.043 225.0 8.856 9.95 6.685 1298 2.031 141.70 5.67
7.62 0.300 8 40.23 1.584 1.08 0.043 218.9 8.617 10.51 7.064 1226 1.920 138.10 5.53
8.13 0.320 8 39.11 1.540 1.07 0.042 218.9 8.378 11.06 7.423 1156 1.813 134.40 5.38
60.33mm
2.375in.		 5.59 0.220 8 47.92 1.887 1.15 0.045 260.7 10.256 8.66 5.818 1755 2.743 163.00 6.51
6.10 0.240 8 46.79 1.842 1.14 0.045 254.5 10.020 9.31 6.258 1672 2.611 159.30 6.37
6.60 0.260 8 45.66 1.798 1.13 0.045 248.4 9.781 9.95 6.688 1590 2.486 155.70 6.22
7.11 0.280 8 44.54 1.753 1.12 0.044 242.3 9.536 10.58 7.107 1511 2.361 152.00 6.08
7.62 0.300 8 43.41 1.709 1.11 0.044 236.1 9.297 11.18 7.515 1433 2.242 148.40 5.93
8.13 0.320 8 42.28 1.665 1.10 0.043 230.0 9.085 11.78 7.913 1358 2.126 144.70 5.79
8.59 0.338 8 42.28 1.625 1.09 0.043 224.5 8.840 12.30 8.262 1292 2.023 141.40 5.66
63.50mm
2.500 in.		 6.10 0.240 8 49.97 1.967 1.17 0.046 271.8 10.700 9.85 6.612 1912 2.984 169.60 6.77
6.60 0.260 8 48.84 1.923 1.16 0.046 265.7 10.461 10.54 7.080 1825 2.850 165.90 6.63
7.11 0.280 8 47.71 1.878 1.15 0.045 259.5 10.216 11.20 7.529 1740 2.716 162.30 6.48
7.62 0.300 8 46.58 1.834 1.14 0.045 253.4 9.977 11.86 7.967 1657 2.588 158.60 6.34
8.13 0.320 8 45.46 1.790 1.13 0.044 247.3 9.738 12.49 8.395 1575 2.464 155.00 6.20
8.59 0.338 8 44.44 1.750 1.12 0.044 241.8 9.520 13.05 8.771 1504 2.353 151.70 6.07
9.14 0.360 8 43.20 1.701 1.11 0.044 235.0 9.253 13.72 9.218 1419 2.221 147.70 5.91
9.53 0.375 8 42.35 1.667 1.10 0.043 230.4 9.068 14.16 9.516 1363 2.131 145.00 5.80

 

Item Value Tolerances
B Tubes outsider diameter - - a a
C Major inside diameter C=B-(1.11*1*2) C=B-(1.11*1*2) a a
D Number of ribs - - - -
E Spicified rib height - - B(1) B(1)
F Pitch(rib lead) - - +/-3.18mm +/-0.125 in.
G Lead - - +/-3.18*D mm +/-0.125*D in.
H Rib width at the top(longitudinal) 5.59 mm 0.220 in. +/-1.27 mm +/-0.050 in.
I Min. wall thickness - - - -
j Rib side angle (both sides of the rib) 55o 55o +/-15o +/-15o
M Min. inside diameter - - - -
L Rib radius (top and bottom of the rib) form 0.4 to 2 mm 1/64 to 5/64 in.    
P Lead angle 30o 30o Nominal value Nominal value
S Rib width at top(longitudinal) 3.23 mm 0.127 in. - -

(1) The average rib height of all the ribs should fall without the proper value of +/- tolerancein the following table. The maximum deviation on anyrib height from specification values should not exceed the +/- tolarance by more than 0.003 in.

O
U
T
S
I
D
E

D
I
A
M
E
T
E
R		   Minimum Wall
Thickness		 No.
of RIBC		 Major I.D RIB height Lead Mean Weight Flow Section Wet Internal
Perimeter
  mm in.   mm in. mm in. mm in. Kg/m Lb/ft mm2 Sq in. mm in.
28.58mm /
1.125 in.		 3.76 0.184 4 20.23 0.796 0.95 0.037 110.1 4.330 2.62 1.761 307 0.476 68.3 2.69
3.96 0.156 4 19.78 0.779 0.94 0.037 107.6 4.238 2.73 1.835 293 0.455 66.9 2.63
4.19 0.165 4 19.27 0.759 0.93 0.037 104.8 4.129 2.85 1.917 278 0.431 65.2 2.57
4.57 0.180 4 18.43 0.725 0.92 0.036 100.2 3.944 3.05 2.048 253 0.392 62.5 2.46
31.75 mm/
1.250 in.		 3.76 0.148 6 23.41 0.921 0.99 0.039 127.3 5.010 3.01 2.023 408 0.632 81.0 3.19
3.96 0.156 6 22.95 0.904 0.98 0.039 124.9 4.918 3.14 2.109 392 0.608 79.5 3.13
4.19 0.165 6 22.45 0.884 0.98 0.039 122.1 4.809 3.28 2.204 374 0.580 77.9 3.07
4.57 0.180 6 21.60 0.850 0.97 0.038 117.5 4.624 3.51 2.356 345 0.534 75.1 2.96
34.92 mm/
1.375 in.		 3.76 0.148 6 26.58 1.046 1.03 0.041 144.6 5.690 3.35 2.248 532 0.824 91.3 3.59
3.96 0.156 6 26.13 1.029 1.03 0.040 142.1 5.598 3.49 2.346 513 0.796 89.8 3.54
4.19 0.165 6 25.62 1.009 1.02 0.040 139.4 5.489 3.65 2.454 493 0.764 88.2 3.47
4.57 0.180 6 24.78 0.975 1.01 0.040 134.8 5.304 3.91 2.629 460 0.712 85.4 3.36
4.78 0.188 6 24.32 0.958 1.00 0.039 132.3 5.212 4.05 2.720 442 0.686 84.0 3.31
5.16 0.203 6 23.48 0.924 0.99 0.039 127.7 5.027 4.29 2.886 411 0.636 81.2 3.20
5.59 0.220 6 22.52 0.887 0.98 0.039 122.5 4.825 4.56 3.067 377 0.584 78.1 3.08
37.31 mm/
1.469 in.		 3.76 0.148 6 28.97 1.140 1.06 0.042 157.6 6.202 3.66 2.459 627 0.927 101.6 4.00
3.96 0.156 8 28.52 1.123 1.05 0.041 155.1 6.109 3.82 2.565 607 0.942 100.2 3.94
4.19 0.165 6 28.01 1.103 1.05 0.041 152.4 6.000 3.93 2.624 593 0.919 95.9 3.78
4.57 0.180 6 27.16 1.069 1.04 0.041 147.8 5.815 4.22 2.834 556 0.862 93.1 3.67
4.78 0.188 6 26.71 1.052 1.03 0.041 145.3 5.723 4.37 2.934 537 0.833 91.7 3.61
5.16 0.230 6 25.87 1.018 1.02 0.040 140.7 5.538 4.64 3.116 503 0.779 88.9 3.50
5.59 0.220 6 24.91 0.981 1.01 0.040 135.5 5.337 4.94 3.316 465 0.721 85.8 3.38
6.10 0.240 6 23.78 0.936 1.00 0.039 129.4 5.092 5.27 3.542 422 0.654 82.2 3.24
38.1 mm/
1.500 in.		 3.76 0.148 8 29.76 1.171 1.07 0.042 161.9 6.370 3.74 2.515 663 1.027 104.2 4.10
3.96 0.156 8 29.30 1.154 1.06 0.042 159.4 6.278 3.91 2.624 643 0.997 102.7 4.05
4.19 0.165 8 28.80 1.134 1.06 0.042 156.7 6.169 4.09 2.745 620 0.961 101.1 3.98
4.57 0.180 6 27.95 1.100 1.05 0.041 152.0 5.948 4.32 2.901 590 0.914 95.7 3.77
4.78 0.188 6 27.50 1.083 1.04 0.041 149.6 5.892 4.47 3.004 571 0.885 94.2 3.71
5.16 0.203 6 26.65 1.049 1.03 0.041 145.0 5.707 4.75 3.192 535 0.983 91.5 3.60
5.59 0.220 6 25.70 1.012 1.02 0.040 139.8 5.505 5.06 3.399 496 0.769 88.4 3.48
6.10 0.240 6 24.57 0.967 1.01 0.040 133.6 5.260 5.40 3.632 452 0.700 84.7 3.34
6.35 0.250 6 24.00 0.945 1.00 0.039 130.6 5.141 5.57 3.744 430 0.667 82.9 3.26
41.28 mm/
1.625 in.		 3.76 0.148 8 32.93 1.296 1.10 0.043 179.1 7.050 4.08 2.741 818 1.268 114.5 4.51
3.96 0.156 8 32.48 1.279 1.10 0.043 176.7 6.958 4.26 2.862 795 1.234 113.1 4.45
4.19 0.164 8 31.97 1.259 1.09 0.043 173.9 6.849 4.46 2.997 770 1.194 111.4 4.39
4.57 0.180 8 31.13 1.225 1.08 0.043 169.3 6.664 4.79 3.216 728 1.128 108.7 4.28
4.78 0.188 8 30.67 1.208 1.08 0.042 166.9 6.572 4.96 3.331 707 1.096 107.2 4.22
5.16 0.203 8 29.83 1.174 1.07 0.042 162.3 6.387 5.27 3.541 667 1.033 104.4 4.11
5.59 0.220 8 28.87 1.137 1.06 0.042 157.1 6.185 5.61 3.772 623 0.966 101.3 3.99
6.10 0.240 6 27.74 1.092 1.04 0.041 150.9 5.940 5.94 3.993 581 0.900 95.0 3.74
6.35 0.250 6 27.18 1.070 1.04 0.041 147.8 5.821 6.13 4.120 557 0.863 93.2 3.67
6.60 0.260 6 26.61 1.048 1.03 0.041 144.8 5.701 6.32 4.245 533 0.827 91.4 3.60
7.21 0.284 6 25.26 0.995 1.01 0.040 137.4 5.413 6.75 4.534 479 0.742 87.0 3.43
44.45 mm/
1.750 in.		 3.76 0.148 8 36.11 1.421 1.14 0.045 196.4 7.730 4.41 2.967 989 1.533 124.8 4.91
3.96 0.156 8 35.65 1.404 1.13 0.045 194.0 7.638 4.61 3.100 964 1.495 123.8 4.86
4.19 0.165 8 35.15 1.384 1.13 0.044 191.2 7.529 4.83 3.248 936 1.452 121.7 4.79
4.57 0.180 8 34.30 1.350 1.12 0.044 186.6 7.344 5.19 3.489 890 1.379 119.0 4.68
4.78 0.188 8 33.85 1.333 1.11 0.044 184.1 7.252 5.38 3.616 866 1.344 117.5 4.63
5.16 0.203 8 33.00 1.299 1.10 0.043 179.5 7.067 5.73 3.848 822 1.274 114.8 4.52
5.59 0.220 8 32.05 1.262 1.09 0.043 174.3 6.865 6.11 4.105 774 1.200 111.6 4.40
6.10 0.240 8 30.92 1.217 1.08 0.043 168.2 6.620 6.54 4.397 718 1.113 108.0 4.25
6.35 0.250 8 30.35 1.195 1.08 0.042 165.1 6.501 6.75 4.539 691 1.720 106.1 4.18
6.60 0.260 8 29.79 1.173 1.07 0.042 162.1 6.381 6.96 4.678 665 1.310 104.3 4.11
7.21 0.284 8 28.44 1.120 1.05 0.041 154.7 6.093 7.44 5.002 604 0.936 99.9 3.93
7.62 0.300 6 27.53 1.084 1.04 0.041 149.8 5.897 7.69 5.168 572 0.887 94.3 3.71
7.95 0.313 6 26.80 1.055 1.03 0.041 145.8 5.739 7.93 5.332 541 0.838 92.0 3.62
50.80 mm/
2.000 in.		 3.96 0.156 10 42.00 1.654 1.20 0.047 228.5 8.998 5.39 3.623 1340 2.078 147.0 5.79
4.19 0.165 10 41.50 1.634 1.19 0.047 225.7 8.889 5.65 3.797 1370 2.027 145.3 5.72
4.57 0.180 10 40.65 1.600 1.18 0.047 221.1 218.7 6.08 8.704 1253 4.083 142.6 5.61
4.78 0.188 10 40.20 1.583 1.18 0.046 218.7 8.612 6.30 4.233 1224 1.899 141.1 5.56
5.16 0.203 10 39.35 1.549 1.17 0.046 214.1 8.427 6.71 4.510 1172 1.816 138.3 5.44
5.59 0.220 10 38.40 1.512 1.16 0.046 208.9 8.225 7.17 4.416 1114 1.729 135.2 5.32
6.10 0.240 10 37.27 1.467 1.15 0.045 202.7 7.980 7.69 5.167 1047 1.623 131.5 5.18
6.35 0.250 10 36.70 1.445 1.14 0.045 199.7 7.861 7.94 5.339 1015 1.573 129.6 5.10
6.60 0.260 8 36.14 1.423 1.14 0.045 196.6 7.741 8.13 5.462 991 1.567 124.9 4.92
7.21 0.284 8 34.79 1.370 1.12 0.044 189.2 7.453 8.72 5.857 916 1.422 120.6 4.75
7.62 0.300 8 33.88 1.334 1.11 0.044 184.3 7.257 9.10 6.112 868 1.346 117.6 4.63
7.95 0.313 8 33.15 1.305 1.11 0.044 180.3 7.099 9.40 6.314 830 1.286 115.2 5.54
8.13 0.320 8 32.76 1.290 1.10 0.043 178.2 7.018 9.56 6.421 810 1.256 114.0 4.49
8.64 0.340 8 31.63 1.245 1.09 0.043 172.1 6.773 10.00 6.720 753 1.167 110.3 4.34
53.98 mm/
2.125 in.		 3.96 0.156 12 45.18 1.779 1.23 0.048 245.8 9.678 5.82 3.910 1547 2.398 160.4 6.32
4.19 0.165 12 44.67 1.759 1.22 0.048 243.0 9.567 6.10 4.098 1511 2.343 158.7 6.25
4.57 0.180 10 43.83 1.725 1.22 0.048 238.4 9.384 6.48 4.357 1462 2.265 152.9 6.02
4.78 0.188 10 43.37 1.637 1.21 0.048 236.0 9.292 6.72 4.519 1431 2.220 151.4 5.96
5.16 0.203 10 42.53 1.708 1.20 0.047 231.4 9.107 7.17 4.818 1375 2.130 148.7 5.85
5.59 0.220 10 41.57 1.674 1.19 0.047 226.1 8.905 7.66 5.150 1312 2.034 145.6 5.73
6.10 0.240 10 40.44 1.592 1.18 0.047 220.0 8.660 8.23 5.531 1240 1.921 141.9 5.58
6.35 0.250 10 39.88 1.570 1.18 0.046 216.9 8.541 8.51 5.517 1204 1.867 140.0 5.51
6.60 0.260 10 39.31 1.548 1.17 0.046 213.9 8.421 8.78 5.901 1169 1.813 138.2 5.44
7.21 0.284 10 37.96 1.495 1.16 0.046 206.5 8.133 9.42 6.331 1088 1.687 133.8 5.27
7.62 0.300 10 37.06 1.459 1.15 0.045 201.6 7.937 9.83 6.609 1035 1.605 130.8 5.15
7.95 0.313 8 36.33 1.430 1.14 0.045 197.6 7.779 10.10 6.785 1002 1.553 125.6 4.94
8.13 0.320 8 35.93 1.415 1.14 0.045 195.5 7.698 10.27 6.902 980 1.519 124.3 4.89
8.64 0.340 8 34.80 1.370 1.12 0.044 189.3 7.543 10.76 7.230 917 1.422 120.6 4.75
9.14 0.360 8 33.68 1.326 1.11 0.044 183.2 7.213 10.23 7.548 857 1.329 116.9 4.60
57.15 mm/
2.250 in.		 4.19 0.165 12 47.85 1.884 1.25 0.049 260.3 10.249 6.47 4.351 1740 2.698 169.2 6.66
4.57 0.180 12 47.00 1.850 1.24 0.049 255.7 10.604 6.97 4.681 1678 2.599 166.4 6.55
4.78 0.188 12 46.55 1.833 1.24 0.049 253.2 9.927 7.22 4.855 1645 2.551 164.9 6.49
5.16 0.203 12 45.70 1.799 1.23 0.049 248.6 9.787 7.70 5.18 1584 2.454 1584 6.38
5.59 0.220 12 44.75 1.762 1.22 0.048 243.4 9.585 8.23 5.53 1516 2.351 1516 6.26
5.84 0.230 10 45.18 1.739 1.22 0.048 240.3 9.460 8.47 5.69 1487 2.303 1487 6.06
6.10 0.240 10 43.62 1.717 1.21 0.048 237.3 9.340 8.77 5.89 1448 2.244 1448 5.99
6.35 0.250 10 43.05 1.695 1.21 0.048 234.2 9.221 9.07 6.10 1410 2.185 1410 5.92
6.60 0.260 10 42.49 1.673 1.20 0.047 231.1 9.101 9.37 6.29 1372 2.127 1372 5.85
6.73 0.265 10 42.21 1.662 1.20 0.047 229.6 9.041 9.51 6.39 1353 2.099 1353 5.81
7.21 0.284 10 41.14 1.620 1.19 0.047 223.8 8.813 10.06 6.76 1284 1.991 1284 5.68
7.62 0.300 10 40.23 1.584 1.18 0.046 218.9 8.617 10.51 7.06 1227 1.901 1227 5.56
7.95 0.313 10 39.50 1.555 1.17 0.046 214.9 8.459 10.87 7.30 1181 1.830 1181 5.46
8.13 0.320 10 39.11 1.540 1.17 0.046 212.7 8.378 11.06 7.43 1157 1.794 1157 5.41
8.64 0.340 10 37.98 1.495 1.16 0.046 206.6 8.133 11.59 7.79 1089 1.689 1089 5.27
63.50 mm/
2.500 in.		 4.19 0.165 14 54.20 2.134 1.31 0.052 294.8 11.609 7.31 4.91 2236 3.467 2236 7.61
4.57 0.180 14 53.35 2.100 1.30 0.051 290.2 11.424 7.86 5.28 2165 3.355 2165 7.50
4.78 0.188 14 52.90 2.083 1.30 0.051 287.8 11.332 8.16 5.48 2128 3.299 2128 7.44
5.16 0.203 12 52.05 2.049 1.29 0.051 283.2 11.147 8.62 5.79 2068 3.205 2068 7.20
5.33 0.210 12 51.66 2.034 1.29 0.051 281.0 11.065 8.87 5.96 2037 3.157 2037 7.15
5.59 0.220 12 51.10 2.012 1.28 0.050 287.0 10.945 9.23 6.20 1191 3.088 1191 7.08
5.84 0.230 12 50.53 1.989 1.28 0.050 274.9 10.820 9.58 6.48 1947 3.016 1947 7.00
5.97 0.235 12 50.25 1.978 1.27 0.050 273.4 10.760 8.75 6.56 1924 2.982 1924 6.97
6.10 0.240 12 49.97 1.967 1.27 0.050 271.8 10.700 9.93 6.67 1902 2.984 1902 6.93
6.22 0.245 12 49.69 1.565 1.27 0.050 270.3 10.641 10.10 6.79 1880 2.914 1880 6.90
6.35 0.250 12 49.40 1.945 1.27 0.050 268.8 10.581 10.27 6.90 1859 2.881 1859 6.86
6.48 0.255 12 49.12 1.934 1.26 0.050 267.2 10.521 10.44 7.02 1837 2.847 1837 6.82
6.60 0.260 12 48.84 1.923 1.26 0.050 265.7 10.461 10.61 7.13 1815 2.814 1815 6.79
6.73 0.265 12 48.56 1.912 1.26 0.050 264.2 10.401 10.78 7.24 1794 2.781 1794 6.75
6.86 0.270 12 48.28 1.901 1.26 0.050 262.6 10.341 10.95 7.36 1773 2.749 1773 6.72
6.99 0.275 12 47.99 1.889 1.25 0.049 261.1 10.276 11.11 7.47 1751 2.713 1751 6.68
7.11 0.280 12 47.71 1.878 1.25 0.049 259.5 10.216 11.28 7.58 1730 2.681 1730 6.64
7.21 0.284 12 47.49 1.870 1.25 0.049 258.3 10.173 11.41 7.67 1714 2.657 1714 6.61
66.68 mm/
2.625 in.		 4.19 0.165 14 57.37 2.259 1.34 0.053 312.1 12.289 7.68 5.16 2513 3.896 204 8.02
4.57 0.180 14 56.53 2.225 1.33 0.052 307.5 12.104 8.27 5.56 2437 3.777 201 7.91
4.78 0.188 14 56.07 2.208 1.32 0.052 305.0 12.012 8.59 5.77 2398 3.718 199 7.85
5.16 0.203 14 55.23 2.174 1.32 0.052 300.4 11.827 9.16 6.16 2324 3.602 197 7.74
5.59 0.220 14 54.27 2.137 1.31 0.052 295.2 11.625 9.81 5.59 2242 3.477 194 7.62
6.10 0.240 14 53.14 2.092 1.30 0.051 289.1 11.380 10.55 7.09 2148 3.329 190 7.47
6.35 0.250 12 52.58 2.070 1.29 0.051 286.0 11.261 10.83 7.28 2111 3.273 185 7.27
6.60 0.260 12 52.01 2.048 1.29 0.051 283.0 11.141 11.20 7.52 2065 3.202 183 7.20
69.85 mm/
2.725 in.		 4.57 0.180 14 59.70 2.350 1.35 0.053 324.8 12.784 8.68 5.84 2726 4.223 211 8.32
4.78 0.188 14 59.25 2.333 1.35 0.053 322.3 12.692 9.01 6.06 2684 4.161 210 8.26
5.16 0.203 14 58.40 2.299 1.34 0.053 317.7 12.507 9.62 6.47 2606 4.038 207 8.15
5.33 0.210 14 58.01 2.284 1.34 0.053 315.6 12.425 9.91 6.66 2570 3.984 206 8.10
5.59 0.220 14 57.45 2.262 1.34 0.053 312.5 12.305 10.30 6.92 2519 3.906 204 8.03
5.84 0.230 14 56.88 2.239 1.33 0.052 309.4 12.180 10.70 7.19 2469 3.825 202 7.95
6.10 0.240 14 56.32 2.217 1.33 0.052 306.4 12.060 11.09 7.45 2419 3.749 200 7.88
6.22 0.245 14 56.04 2.206 1.32 0.052 304.8 12.001 11.28 7.58 2394 3.711 199 7.85
6.35 0.250 14 55.75 2.195 1.32 0.052 303.3 11.941 11.48 7.71 2370 3.673 198 7.87
6.60 0.260 14 55.19 2.173 1.32 0.052 300.2 11.821 11.86 7.97 2321 3.598 197 7.47
75.41 mm/
2.969 in.		 4.57 0.180 16 65.26 2.569 1.40 0.055 355.0 13.975 9.49 6.38 3258 5.048 233 9.18
4.78 0.188 16 64.81 2.552 1.40 0.055 352.6 13.883 9.85 6.62 3212 4.980 232 9.12
5.16 0.203 16 63.97 2.518 1.39 0.055 348.0 13.698 10.52 7.07 3127 4.845 229 9.01
5.33 0.210 16 63.57 2.503 1.39 0.055 345.8 13.616 10.82 7.27 3088 4.787 228 8.96
5.59 0.220 16 63.01 2.481 1.38 0.054 342.8 13.497 11.26 7.57 3032 4.701 226 8.88
5.84 0.230 16 62.44 2.458 1.38 0.054 339.7 13.372 11.70 7.86 2977 4.612 224 8.81
76.20 mm/
3.000 in.		 5.16 0.203 16 64.75 2.549 1.39 0.055 352.3 13.867 10.63 7.14 3206 4.968 231 9.11
5.33 0.210 16 64.36 2.534 1.39 0.055 350.1 13.785 10.94 7.35 3166 4.909 230 9.06
5.59 0.220 16 63.80 2.512 1.39 0.055 347.0 13.665 11.39 7.65 3110 4.822 228 8.99
5.84 0.230 16 63.23 2.489 1.38 0.055 344.0 13.540 11.82 7.95 3054 4.732 226 8.91