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Gear
Verniers

CHORDAL THICKNESS AND CHORDAL ADDENDUM OF GEAR TEETH
This table is for spur gears of one diametral pitch. For any other diametral pitch, divide the given value by the desired pitch.  The table lists the chordal thickness at the pitch circle when the addendum is standard for full-depth teeth or equal to 1 divided by the diametral pitch.
# of
Teeth		 Chordal
Thickness		 Chordal
Addendum		 # of
Teeth		 Chordal
Thickness		 Chordal
Addendum		 # of
Teeth		 Chordal
Thickness		 Chordal
Addendum
10
11
12
13		 1.56434
1.56546
1.56631
1.56698		 1.06156
1.05598
1.05133
1.04739		 59
60
61
62		 1.57051
1.57062
1.57062
1.57063		 1.01046
1.01029
1.01011
1.00994		 108
109
110
111		 1.57074
1.57075
1.57075
1.57075		 1.00570
1.00565
1.00560
1.00556
14
15
16
17		 1.56750
1.56794
1.56827
1.56856		 1.0441
1.04109
1.03852
1.03625		 63
64
65
66		 1.57063
1.57064
1.57064
1.57065		 1.00978
1.00963
1.00947
1.00933		 112
113
114
115		 1.57075
1.57075
1.57075
1.57075		 1.00551
1.00546
1.00541
1.00537
18
19
20
21		 1.56880
1.56901
1.56918
1.56933		 1.03425
1.03244
1.03083
1.02936		 67
68
69
70		 1.57065
1.57066
1.57066
1.57067		 1.00920
1.00907
1.00893
1.00880		 116
117
118
119		 1.57075
1.57075
1.57075
1.57075		 1.00533
1.00529
1.00524
1.00519
22
23
24
25		 1.56946
1.56958
1.56967
1.56977		 1.02803
1.02681
1.02569
1.02466		 71
72
73
74		 1.57067
1.57067
1.57068
1.57068		 1.00867
1.00855
1.00843
1.00832		 120
121
122
123		 1.57075
1.57075
1.57075
1.57076		 1.00515
1.00511
1.00507
1.00503
26
27
28
29		 1.5684
1.56991
1.56998
1.57003		 1.02371
1.02284
1.02202
1.02127		 75
76
77
78		 1.57068
1.57069
1.57069
1.57069		 1.00821
1.00810
1.00799
1.00789		 124
125
126
127		 1.57076
1.57076
1.57076
1.57076		 1.00499
1.00495
1.00491
1.00487
30
31
32
33		 1.57008
1.57012
1.57016
1.57019		 1.02055
1.01990
1.01926
1.01869		 79
80
81
82		 1.57069
1.57070
1.57070
1.57070		 1.00780
1.00772
1.00762
1.00752		 128
129
130
131		 1.57076
1.57076
1.57076
1.57076		 1.00483
1.00479
1.00475
1.00472
34
35
36
37		 1.57024
1.57027
1.57030
1.57032		 1.01813
1.01762
1.01714
1.01667		 83
84
85
86		 1.57070
1.57071
1.57071
1.57071		 1.00743
1.00734
1.00725
1.00716		 132
133
134
135		 1.57076
1.57076
1.57076
1.57076		 1.00469
1.00466
1.00462
1.00457
38
39
40
41		 1.57035
1.57037
1.57039
1.57041		 1.01623
1.01582
1.01542
1.01504		 87
88
89
90		 1.57071
1.57071
1.57072
1.57072		 1.00708
1.00700
1.00693
1.00689		 136
137
138
139		 1.57076
1.57076
1.57076
1.57076		 1.00454
1.00451
1.00447
1.00444
42
43
44
45		 1.57043
1.57045
1.57047
1.57048		 1.01469
1.01434
1.01402
1.01370		 91
92
93
94		 1.57072
1.57072
1.57072
1.57072		 1.00679
1.00672
1.00665
1.00658		 140
141
142
143		 1.57076
1.57076
1.57076
1.57076		 1.00441
1.00439
1.00435
1.00432
46
47
48
49		 1.57050
1.57051
1.57052
1.57053		 1.01341
1.01311
1.01285
1.01258		 95
96
97
98		 1.57073
1.57073
1.57073
1.57073		 1.00651
1.00644
1.00637
1.00630		 144
145
146
147		 1.57076
1.57077
1.57077
1.57077		 1.00429
1.00425
1.00422
1.00419
50
51
52
53		 1.57054
1.57055
1.57056
1.57057		 1.01233
1.01209
1.01187
1.01165		 99
100
101
102		 1.57073
1.57073
1.57074
1.57074		 1.00623
1.00617
1.00611
1.00505		 148
149
150
151		 1.57077
1.57077
1.57077
1.57077		 1.00416
1.00413
1.00411
1.00409
54
55
56
57
58		 1.57058
1.57058
1.57059
1.57060
1.57061		 1.01143
1.01121
1.01102
1.01083
1.01064		 103
104
105
106
107		 1.57074
1.57074
1.57074
1.57074
1.57074		 1.00599
1.00593
1.00587
1.00581
1.00575		 152
153
154
155
156		 1.57077
1.57077
1.57077
1.57077
1.57077		 1.00407
1.00405
1.00402
1.00400
1.00397