Type 3
26 FPI Fine-Fin®
Materials: Ferritic Stainless Steel, Carbon Steel, Copper-Nickel Alloys, Monel. | 26 | fins per inch | | 1023 | fins per meter | | .049 | (Inches) average fin height | | 1.245 | (mm) average fin height | | .013 | (Inches) average fin thickness | | .330 | (mm) average fin thickness |
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| Part Number | Plain Section Average Diameter | Plain Section Average Wall | Wall Under Fin Average | Wall Under Fin Minimum | Nominal Root Diameter | Fin Section I.D. | Outside Area Ao | Inside Area Ai | Area Ratio Ao/Ai | I.D. Cross Section Area |
| (Inches) | (Inches) | (Inches) | (Inches) | (Inches) | (Inches) | (Ft2/Ft) | (Ft2/Ft) |
| (Inches2) |
| (mm) | (mm) | (mm) | (mm) | (mm) | (mm) | (m2/m) | (m2/m) |
| (cm2) | 264028 | .625 | .049 | .028 | .025 | .527 | .471 | .492 | .123 | 4.000 | .174 |
| 15.875 | 1.245 | .711 | .635 | 13.386 | 11.963 | .150 | .037 |
| 1.124 | 264035 | .625 | .058 | .035 | .031 | .527 | .457 | .492 | .120 | 4.100 | .164 |
| 15.875 | 1.473 | .889 | .787 | 13.386 | 11.608 | .150 | .037 |
| 1.058 | 264042 | .625 | .065 | .042 | .037 | .527 | .443 | .492 | .116 | 4.241 | .154 |
| 15.875 | 1.651 | 1.067 | .940 | 13.386 | 11.252 | .150 | .035 |
| .994 | 264049 | .625 | .072 | .049 | .044 | .527 | .429 | .492 | .112 | 4.393 | .145 |
| 15.875 | 1.829 | 1.245 | 1.118 | 13.386 | 10.897 | .150 | .034 |
| .933 | 264065 | .625 | .083 | .065 | .058 | .527 | .397 | .492 | .104 | 4.731 | .124 |
| 15.875 | 2.108 | 1.651 | 1.473 | 13.386 | 10.084 | .150 | .032 |
| .799 |  | 265028 | .750 | .049 | .028 | .025 | .652 | .596 | .596 | .156 | 3.821 | .279 |
| 19.050 | 1.245 | .711 | .635 | 16.561 | 15.138 | .182 | .048 |
| 1.800 | 265035 | .750 | .058 | .035 | .031 | .652 | .582 | .596 | .152 | 3.921 | .266 |
| 19.050 | 1.473 | .889 | .787 | 16.561 | 14.783 | .182 | .046 |
| 1.716 | 265042 | .750 | .065 | .042 | .037 | .652 | .568 | .596 | .149 | 4.000 | .253 |
| 19.050 | 1.651 | 1.067 | .940 | 16.561 | 14.427 | .182 | .045 |
| 1.635 | 265049 | .750 | .072 | .049 | .044 | .652 | .554 | .596 | .145 | 4.110 | .241 |
| 19.050 | 1.829 | 1.245 | 1.118 | 16.561 | 14.072 | .182 | .044 |
| 1.555 | 265065 | .750 | .083 | .065 | .058 | .652 | .522 | .596 | .137 | 4.350 | .214 |
| 19.050 | 2.108 | 1.651 | 1.473 | 16.561 | 13.259 | .182 | .042 |
| 1.381 | 265083 | .750 | .109 | .083 | .074 | .652 | .486 | .596 | .127 | 4.693 | .186 |
| 19.050 | 2.769 | 2.108 | 1.880 | 16.561 | 12.344 | .182 | .039 |
| 1.197 | | 266028 | .875 | .049 | .028 | .025 | .777 | .721 | .704 | .189 | 3.725 | .408 |
| 22.225 | 1.245 | .711 | .635 | 19.736 | 18.313 | .215 | .058 |
| 2.634 | 266035 | .875 | .058 | .035 | .031 | .777 | .707 | .704 | .185 | 3.805 | .393 |
| 22.225 | 1.473 | .889 | .787 | 19.736 | 17.958 | .215 | .056 |
| 2.533 | 266042 | .875 | .065 | .042 | .037 | .777 | .693 | .704 | .181 | 3.890 | .377 |
| 22.225 | 1.651 | 1.067 | .940 | 19.736 | 17.602 | .215 | .055 |
| 2.433 | 266049 | .875 | .072 | .049 | .044 | .777 | .679 | .704 | .178 | 3.955 | .362 |
| 22.225 | 1.829 | 1.245 | 1.118 | 19.736 | 17.247 | .215 | .054 |
| 2.336 | 266065 | .875 | .083 | .065 | .058 | .777 | .647 | .704 | .169 | 4.166 | .329 |
| 22.225 | 2.108 | 1.651 | 1.473 | 19.736 | 16.434 | .215 | .052 |
| 2.121 | 266083 | .875 | .109 | .083 | .074 | .777 | .611 | .704 | .160 | 4.400 | .293 |
| 22.225 | 2.769 | 2.108 | 1.880 | 19.736 | 15.519 | .215 | .049 |
| 1.892 | 267035 | 1.000 | .058 | .035 | .031 | .902 | .832 | .811 | .218 | 3.720 | .544 |
| 25.400 | 1.473 | .889 | .787 | 22.911 | 21.133 | .247 | .066 |
| 3.508 | 267042 | 1.000 | .065 | .042 | .037 | .902 | .818 | .811 | .214 | 3.790 | .526 |
| 25.400 | 1.651 | 1.067 | .940 | 22.911 | 20.777 | .247 | .065 |
| 3.391 | 267049 | 1.000 | .072 | .049 | .044 | .902 | .804 | .811 | .210 | 3.862 | .508 |
| 25.400 | 1.829 | 1.245 | 1.118 | 22.911 | 20.422 | .247 | .064 |
| 3.275 | 267065 | 1.000 | .083 | .065 | .058 | .902 | .772 | .811 | .202 | 4.015 | .468 |
| 25.400 | 2.108 | 1.651 | 1.473 | 22.911 | 19.609 | .247 | .062 |
| 3.020 | 267083 | 1.000 | .109 | .083 | .074 | .902 | .736 | .811 | .193 | 4.202 | .425 |
| 25.400 | 2.769 | 2.108 | 1.880 | 22.911 | 18.694 | .247 | .059 |
| 2.745 | |
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| D - Outside Diameter of Plain End | W - Wall Thickness of Plain End | | Di - Inside Diameter of Plain End | Wf - Wall Thickness Under Fin |
| dr- Root Diameter |
Fh- Height of Fin | | do - Diameter Over Fins | Fm - Mean Fin Thickness | | di - Inside Diameter of Fin Section |
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DEFINITION OF HPT PART NUMBER
Example: 365028 |
| 36: fins per inch
5: root diameter (reference) in eights of a n inch
028: wall thickness under fin in thousands of an inch | |
