Machinery's Handbook, 31st Edition
CHECKING GEAR SIZES
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Table 4. Checking Internal Spur Gear Sizes by Measurement Between Wires ODD NUMBERS OF TEETH Dimensions in table are for 1 diametral pitch and Van Keuren standard wire sizes. For any other diametral pitch, divide dimensions in table by given pitch. Wire or pin diameter Diametral Pitch 1.44 = No. of Teeth Pressure Angle 14 1 ∕ 2 ° 17 1 ∕ 2 ° 20 ° 25 ° 30 ° 7 5.6393 5.5537 5.4823 5.3462 5.2232 9 7.6894 7.5976 7.5230 7.3847 7.2618 11 9.7219 9.6256 9.5490 9.4094 9.2867 13 11.7449 11.6451 11.5669 11.4265 11.3040 15 13.7620 13.6594 13.5801 13.4391 13.3167 17 15.7752 15.6703 15.5902 15.4487 15.3265 19 17.7858 17.6790 17.5981 17.4563 17.3343 21 19.7945 19.6860 19.6045 19.4625 19.3405 23 21.8017 21.6918 21.6099 21.4676 21.3457 25 23.8078 23.6967 23.6143 23.4719 23.3501 27 25.8130 25.7009 25.6181 25.4755 25.3538 29 27.8176 27.7045 27.6214 27.4787 27.3571 31 29.8216 29.7076 29.6242 29.4814 29.3599 33 31.8251 31.7104 31.6267 31.4838 31.3623 35 33.8282 33.7128 33.6289 33.4860 33.3645 37 35.8311 35.7150 35.6310 35.4879 35.3665 39 37.8336 37.7169 37.6327 37.4896 37.3682 41 39.8359 39.7187 39.6343 39.4911 39.3698 43 41.8380 41.7203 41.6357 41.4925 41.3712 45 43.8399 43.7217 43.6371 43.4938 43.3725 47 45.8416 45.7231 45.6383 45.4950 45.3737 49 47.8432 47.7243 47.6394 47.4960 47.3748 51 49.8447 49.7254 49.6404 49.4970 49.3758 53 51.8461 51.7265 51.6414 51.4979 51.3768 55 53.8474 53.7274 53.6422 53.4988 53.3776 57 55.8486 55.7283 55.6431 55.4996 55.3784 59 57.8497 57.7292 57.6438 57.5003 57.3792 61 59.8508 59.7300 59.6445 59.5010 59.3799 63 61.8517 61.7307 61.6452 61.5016 61.3806 65 63.8526 63.7314 63.6458 63.5022 63.3812 67 65.8535 65.7320 65.6464 65.5028 65.3818 69 67.8543 67.7327 67.6469 67.5033 67.3823 71 69.8551 69.7332 69.6475 69.5038 69.3828 73 71.8558 71.7338 71.6480 71.5043 71.3833 75 73.8565 73.7343 73.6484 73.5048 73.3838 77 75.8572 75.7348 75.6489 75.5052 75.3842 79 77.8573 77.7352 77.6493 77.5056 77.3846 81 79.8584 79.7357 79.6497 79.5060 79.3850 83 81.8590 81.7361 81.6501 81.5064 81.3854 85 83.8595 83.7365 83.6505 83.5067 83.3858 87 85.8600 85.7369 85.6508 85.5071 85.3861 89 87.8605 87.7373 87.6511 87.5074 87.3864 91 89.8610 89.7376 89.6514 89.5077 89.3867 93 91.8614 91.7379 91.6517 91.5080 91.3870 95 93.8619 93.7383 93.6520 93.5082 93.3873 97 95.8623 95.7386 95.6523 95.5085 95.3876 99 97.8627 97.7389 97.6526 97.5088 97.3879 101 99.8631 99.7391 99.6528 99.5090 99.3881 103 101.8635 101.7394 101.6531 101.5093 101.3883 105 103.8638 103.7397 103.6533 103.5095 103.3886 107 105.8642 105.7399 105.6535 105.5097 105.3888 109 107.8645 107.7402 107.6537 107.5099 107.3890 111 109.8648 109.7404 109.6539 109.5101 109.3893
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