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Pocket Guide to Flan..

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Figure 1-14. Method of measuring machine bolts. (Courtesy of the American Pe-<br />

troleum Institute.)<br />

Measuring Machine Bolts<br />

Measure the length of a machine bolt from the under-<br />

side of the head <strong>to</strong> the end point. See Figure 1-14. (All<br />

bolts are rounded off <strong>to</strong> the nearest V4-in.).<br />

Tables 1-2 through 1-16 describe stud bolt and machine<br />

bolt tables for all ANSI flanges previously discussed for<br />

raised and flat faced flanges, plus ring type joint flanges<br />

(RTJ). The tables also include the size of the wrench re-<br />

quired <strong>to</strong> fit the heavy hex nuts used on each diameter of<br />

stud bolts. (Wrench size is calculated as one and one-half<br />

times the size of the bolt plus one eighth of an inch). Figure<br />

1-15 shows a dimensional gauge for bolting.<br />

Example: 1V2 x 1 = 1~/2 + ~/8 = l S/8-in. wrench for a<br />

1-in. nut.<br />

Table 1-17 gives suggested materials for use in differ-<br />

ent line service temperatures.<br />

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