Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . i 3 3 3. UNITED STATES STANDARD THREAD. Formula: j p = pitch = No threads per inch d — depth —pX .6495. /=flat = P Diameter . , . .No. Threads per inchDiameter ....No. Threads per inchDiameter ....No. Threads per inchDiameter . . .No. Threads per inch 1 1% lu 1% 1% \% \% i: 8 7 7 6 6 51^ 5 /4 1^ 78 TS 72 TS /& A: /8 20 18 16 14 13 12 11 10 9 2 5 4% 2% 2M 2% 2% 2% 2% 2;g 3 3^4 41^ 41^ 4 4 4 4 3}4 3% 3%3^4 3% 3K ?>% 3X ^% 43K 31^ 3)^ 3M 3 3 3

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