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Size Designation a Machinery's Handbook 27th Edition Table 5. Unified Miniature Screw Threads — Limits of Size and Tolerances Major Diam. External Threads Pitch Diam. Minor Diam. Minor Diam. Internal Threads Pitch Diam. Major Diam. Lead Angle at Basic Sectional Area at Minor Diam. at D Pitch Max Pitch Diam. — 1.28p b Min Maxb Min Maxc Mind Minb Max Minb Max Mine Maxd mm mm mm mm mm mm mm mm mm mm mm mm mm deg min sq mm 0.30 UNM 0.080 0.300 0.284 0.248 0.234 0.204 0.183 0.217 0.254 0.248 0.262 0.306 0.327 5 52 0.0307 0.35 UNM 0.090 0.350 0.333 0.292 0.277 0.242 0.220 0.256 0.297 0.292 0.307 0.356 0.380 5 37 0.0433 0.40 UNM 0.100 0.400 0.382 0.335 0.319 0.280 0.256 0.296 0.340 0.335 0.351 0.407 0.432 5 26 0.0581 0.45 UNM 0.100 0.450 0.432 0.385 0.369 0.330 0.306 0.346 0.390 0.385 0.401 0.457 0.482 4 44 0.0814 0.50 UNM 0.125 0.500 0.479 0.419 0.401 0.350 0.322 0.370 0.422 0.419 0.437 0.509 0.538 5 26 0.0908 0.55 UNM 0.125 0.550 0.529 0.469 0.451 0.400 0.372 0.420 0.472 0.469 0.487 0.559 0.588 4 51 0.1195 0.60 UNM 0.150 0.600 0.576 0.503 0.483 0.420 0.388 0.444 0.504 0.503 0.523 0.611 0.644 5 26 0.1307 0.70 UNM 0.175 0.700 0.673 0.586 0.564 0.490 0.454 0.518 0.586 0.586 0.608 0.713 0.750 5 26 0.1780 0.80 UNM 0.200 0.800 0.770 0.670 0.646 0.560 0.520 0.592 0.668 0.670 0.694 0.814 0.856 5 26 0.232 0.90 UNM 0.225 0.900 0.867 0.754 0.728 0.630 0.586 0.666 0.750 0.754 0.780 0.916 0.962 5 26 0.294 1.00 UNM 0.250 1.000 0.964 0.838 0.810 0.700 0.652 0.740 0.832 0.838 0.866 1.018 1.068 5 26 0.363 1.10 UNM 0.250 1.100 1.064 0.938 0.910 0.800 0.752 0.840 0.932 0.938 0.966 1.118 1.168 4 51 0.478 1.20 UNM 0.250 1.200 1.164 1.038 1.010 0.900 0.852 0.940 1.032 1.038 1.066 1.218 1.268 4 23 0.608 1.40 UNM 0.300 1.400 1.358 1.205 1.173 1.040 0.984 1.088 1.196 1.205 1.237 1.422 1.480 4 32 0.811 Thds. per in. inch inch inch inch inch inch inch inch inch inch inch inch deg min sq in 0.30 UNM 318 0.0118 0.0112 0.0098 0.0092 0.0080 0.0072 0.0085 0.0100 0.0098 0.0104 0.0120 0.0129 5 52 0.0000475 0.35 UNM 282 0.0138 0.0131 0.0115 0.0109 0.0095 0.0086 0.0101 0.0117 0.0115 0.0121 0.0140 0.0149 5 37 0.0000671 0.40 UNM 254 0.0157 0.0150 0.0132 0.0126 0.0110 0.0101 0.0117 0.0134 0.0132 0.0138 0.0160 0.0170 5 26 0.0000901 0.45 UNM 254 0.0177 0.0170 0.0152 0.0145 0.0130 0.0120 0.0136 0.0154 0.0152 0.0158 0.0180 0.0190 4 44 0.0001262 0.50 UNM 203 0.0197 0.0189 0.0165 0.0158 0.0138 0.0127 0.0146 0.0166 0.0165 0.0172 0.0200 0.0212 5 26 0.0001407 0.55 UNM 203 0.0217 0.0208 0.0185 0.0177 0.0157 0.0146 0.0165 0.0186 0.0185 0.0192 0.0220 0.0231 4 51 0.0001852 0.60 UNM 169 0.0236 0.0227 0.0198 0.0190 0.0165 0.0153 0.0175 0.0198 0.0198 0.0206 0.0240 0.0254 5 26 0.000203 0.70 UNM 145 0.0276 0.0265 0.0231 0.0222 0.0193 0.0179 0.0204 0.0231 0.0231 0.0240 0.0281 0.0295 5 26 0.000276 0.80 UNM 127 0.0315 0.0303 0.0264 0.0254 0.0220 0.0205 0.0233 0.0263 0.0264 0.0273 0.0321 0.0337 5 26 0.000360 0.90 UNM 113 0.0354 0.0341 0.0297 0.0287 0.0248 0.0231 0.0262 0.0295 0.0297 0.0307 0.0361 0.0379 5 26 0.000456 1.00 UNM 102 0.0394 0.0380 0.0330 0.0319 0.0276 0.0257 0.0291 0.0327 0.0330 0.0341 0.0401 0.0420 5 26 0.000563 1.10 UNM 102 0.0433 0.0419 0.0369 0.0358 0.0315 0.0296 0.0331 0.0367 0.0369 0.0380 0.0440 0.0460 4 51 0.000741 1.20 UNM 102 0.0472 0.0458 0.0409 0.0397 0.0354 0.0335 0.0370 0.0406 0.0409 0.0420 0.0480 0.0499 4 23 0.000943 1.40 UNM 85 0.0551 0.0535 0.0474 0.0462 0.0409 0.0387 0.0428 0.0471 0.0474 0.0487 0.0560 0.0583 4 32 0.001257 a Sizes shown in bold type are preferred. b This is also the basic dimension. c This limit, in conjunction with root form shown in Table 2, is advocated for use when optical projection methods of gaging are employed. For mechanical gaging the minimum minor diameter of the internal thread is applied. d This limit is provided for reference only. In practice, the form of the threading tool is relied upon for this limit. e This limit is provided for reference only, and is not gaged. For gaging, the maximum major diameter of the external thread is applied. Copyright 2004, Industrial Press, Inc., New York, NY 1780 MINIATURE SCREW THREADS
;; ;;;; ;;;;;; ;;;;;;;; ;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;; ;;;;;;;;;;;; ;;;;;;;;;; ;;;;;;;; ;;;;;; ;;;; ;; MINIATURE SCREW THREADS 1781 Table 6. Unified Miniature Screw Threads— Minimum Root Flats for External Threads ;;; ;;;;; ;;;;;;; ;;;;;;;;; ;;;;;;;; ;;;;;; ;;;; ;; Pitch No. of Threads Thread Height for Min. Flat at Root 0.64p Minimum Flat at Root Frs = 0.136p mm Per Inch mm Inch mm Inch 0.080 318 0.0512 0.00202 0.0109 0.00043 0.090 282 0.0576 0.00227 0.0122 0.00048 0.100 254 0.0640 0.00252 0.0136 0.00054 0.125 203 0.0800 0.00315 0.0170 0.00067 0.150 169 0.0960 0.00378 0.0204 0.00080 0.175 145 0.1120 0.00441 0.0238 0.00094 0.200 127 0.1280 0.00504 0.0272 0.00107 0.225 113 0.1440 0.00567 0.0306 0.00120 0.250 102 0.1600 0.00630 0.0340 0.00134 0.300 85 0.1920 0.00756 0.0408 0.00161 ;;;;;;; ;;;;;;; ;;;;;;; ;;;;;;; ;;;;;; ;;;;;; Max major dia. of internal thread Min major dia. of internal thread Max major dia. of external thread Min major dia. of external thread Basic major dia. Max pitch diameter of internal thread Min pitch diameter of internal thread Basic pitch dia. Max pitch diameter of external thread Min pitch diameter of external thread Max pitch diameter of internal thread ;;;;;; ;;;;;; External Thread (Screw) Machinery's Handbook 27th Edition 1/2 minor dia. tolerance on internal thread Min minor dia. of internal thread Internal Thread (Nut) 1/2 tolerance on major dia. of external thread Max minor dia. of external thread 1/2 P D tolerance on internal tolerance 1/2 P D tolerance on external tolerance 0.136p Limits of Size Showing Tolerances and Crest Clearances for UNM Threads Copyright 2004, Industrial Press, Inc., New York, NY Min minor dia. of external thread 0.52p 0.64p
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SCREW THREAD SYSTEMS 1725 Screw Thr
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Machinery's Handbook 27th Edition O
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Machinery's Handbook 27th Edition T
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Page 13 and 14: UNIFIED SCREW THREADS 1733 UN Inter
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