Machinery's Handbook, 31st Edition
CHECKING GEAR SIZES
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Table 8. Checking External Spur Gear Sizes by Measurement Over Wires ODD NUMBERS OF TEETH Dimensions in table are for 1 diametral pitch and 1.68-inch series wire sizes (a Van Keuren standard). For any other diametral pitch, divide dimension in table by given pitch. Wire or pin diameter Diametral Pitch 1.68 = No. of Teeth Pressure Angle 14 1 ∕ 2 ° 17 1 ∕ 2 ° 20 ° 25 ° 30 ° 95 97.2749 97.2541 97.2500 97.2650 97.3000 97 99.2757 99.2547 99.2506 99.2655 99.3004 99 101.2764 101.2553 101.2511 101.2659 101.3008 101 103.2771 103.2558 103.2516 103.2663 103.3011 103 105.2778 105.2563 105.2520 105.2667 105.3015 105 107.2785 107.2568 107.2525 107.2671 107.3018 107 109.2791 109.2573 109.2529 109.2674 109.3021 109 111.2798 111.2578 111.2533 111.2678 111.3024 111 113.2804 113.2583 113.2537 113.2681 113.3027 113 115.2809 115.2588 115.2541 115.2684 115.3030 115 117.2815 117.2592 117.2544 117.2687 117.3033 117 119.2821 119.2596 119.2548 119.2690 119.3036 119 121.2826 121.2601 121.2552 121.2693 121.3038 121 123.2831 123.2605 123.2555 123.2696 123.3041 123 125.2836 125.2608 125.2558 125.2699 125.3043 125 127.2841 127.2612 127.2562 127.2702 127.3046 127 129.2846 129.2615 129.2565 129.2704 129.3048 129 131.2851 131.2619 131.2568 131.2707 131.3050 131 133.2855 133.2622 133.2571 133.2709 133.3053 133 135.2859 135.2626 135.2574 135.2712 135.3055 135 137.2863 137.2629 137.2577 137.2714 137.3057 137 139.2867 139.3632 139.2579 139.2716 139.3059 139 141.2871 141.2635 141.2582 141.2718 141.3060 141 143.2875 143.2638 143.2584 143.2720 143.3062 143 145.2879 145.2641 145.2587 145.2722 145.3064 145 147.2883 147.2644 147.2589 147.2724 147.3066 147 149.2887 149.2647 149.2591 149.2726 149.3068 149 151.2890 151.2649 151.2594 151.2728 151.3069 151 153.2893 153.2652 153.2596 153.2730 153.3071 153 155.2897 155.2654 155.2598 155.2732 155.3073 155 157.2900 157.2657 157.2600 157.2733 157.3074 157 159.2903 159.2659 159.2602 159.2735 159.3076 159 161.2906 161.2661 161.2604 161.2736 161.3077 161 163.2909 163.2663 163.2606 163.2738 163.3078 163 165.2912 165.2665 165.2608 165.2740 165.3080 165 167.2915 167.2668 167.2610 167.2741 167.3081 167 169.2917 169.2670 169.2611 169.2743 169.3083 169 171.2920 171.2672 171.2613 171.2744 171.3084 171 173.2922 173.2674 173.2615 173.2746 173.3085 181 183.2936 183.2684 183.2623 183.2752 183.3091 191 193.2947 193.2692 193.2630 193.2758 193.3097 201 203.2957 203.2700 203.2636 203.2764 203.3101 301 303.3022 303.2749 303.2678 303.2798 303.3132 401 403.3056 403.2774 403.2699 403.2815 403.3147 501 503.3076 503.2789 503.2711 503.2825 503.3156 Table 8. (Continued) Checking External Spur Gear Sizes
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