Machinery's Handbook, 31st Edition
2044
ISO Miniature Screw Threads ISO Miniature Screw Threads ISO Miniature Screw Threads, Basic Form ISO/R 1501:1970
Pitch P
0.554256 H = 0.48 P
0.375 H = 0.324760 P
0.320744 H = 0.320744 P
0.125 H = 0.108253 P
H = 0.866025 P
0.08 0.09 0.1
0.069282 0.077942 0.086603 0.108253 0.129904 0.151554 0.173205 0.194856 0.216506 0.259808
0.038400 0.043200 0.048000 0.060000 0.072000 0.084000 0.096000 0.108000 0.120000 0.144000
0.025981 0.029228 0.032476 0.040595 0.048714 0.056833 0.064952 0.073071 0.081190 0.097428
0.022222 0.024999 0.027777 0.034722 0.041666 0.048610 0.055554 0.062499 0.069443 0.083332
0.008660 0.009743 0.010825 0.013532 0.016238 0.018944 0.021651 0.024357 0.027063
0.125 0.15 0.175 0.225 0.25 0.2
0.3
0.032476 ISO Miniature Screw Threads, Basic Dimensions ISO/R 1501:1970
Nominal Diameter
Pitch P
Major Diameter D , d
Pitch Diameter D 2 , d 2
Minor Diameter D 1 , d 1
0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.40
0.080 0.090 0.100 0.100 0.125 0.125 0.150 0.175 0.200 0.225 0.250 0.250 0.250 0.300
0.300000 0.350000 0.400000 0.450000 0.500000 0.550000 0.600000 0.700000 0.800000 0.900000 1.000000 1.100000 1.200000 1.400000
0.248039 0.291543 0.335048 0.385048 0.418810 0.468810 0.502572 0.586334 0.670096 0.753858 0.837620 0.937620 1.037620 1.205144
0.223200 0.263600 0.304000 0.354000 0.380000 0.430000 0.456000 0.532000 0.608000 0.684000 0.760000 0.860000 0.960000
1.112000 D and d dimensions refer to the nut (internal) and screw (external) threads, respectively. British Standard ISO Metric Screw Threads BS 3643:Part 1:1981 (R2004) provides principles and basic data for ISO metric screw threads. It covers single-start, parallel screw threads of from 1 to 300 millimeters in diam eter. Part 2 of the Standard gives the specifications for selected limits of size. Basic Profile.— The ISO basic profile for triangular screw threads is shown in Fig. 1. and basic dimensions of this profile are given in Table 1. Table 1. British Standard ISO Metric Screw Threads Basic Profile Dimensions BS 3643:1981 (R2004) Pitch P H = 0.86603 P 5 ∕ 8 H = 0.54127 P 3 ∕ 8 H = 0.32476 P H /4 = 0.21651 P H /8 = 0.10825 P 0.2 0.173 205 0.108 253 0.064 952 0.043 301 0.021 651 0.25 0.216 506 0.135 316 0.081 190 0.054 127 0.027 063 0.3 0.259 808 0.162 380 0.097 428 0.064 952 0.032 476 0.35 0.303 109 0.189 443 0.113 666 0.075 777 0.037 889 0.4 0.346 410 0.216 506 0.129 904 0.086 603 0.043 301 0.45 0.389 711 0.243 570 0.146 142 0.097 428 0.048 714 0.5 0.433 013 0.270 633 0.162 380 0.108 253 0.054 127 0.6 0.519 615 0.324 760 0.194 856 0.129 904 0.064 952 0.7 0.606 218 0.378 886 0.227 322 0.151 554 0.075 777
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