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Span
Measurements

  

SPAN MEASUREMENTS
14-1/2º PA
Divide "W" measurement by actual D.P. for measuring standard tooth thickness.  If tooth thickness is above or below standard, multiply the difference from standard tooth width by cosine of the pressure angle to obtain in change in "W" dimension.
N T

W
10
11
12
13		 2
2
2
2		 4.6160
4.6213
 
4.6321
14
15
16
17		 2
2
2
2		 4.6374
4.6428
4.6482
4.6536
18
19
20
21		 2
2
2
3		 4.6589
4.6643
4.6697
7.7166
22
23
24
25		 3
3
3
3		 7.7219
7.7273
7.7327
7.7380
26
27
28
29		 3
3
3
3		 7.7334
7.7488
7.7541
7.7595
30
31
32
33		 3
3
3
4		 7.7649
7.7702
7.7756
10.8225
34
35
36
37		 4
4
4
4		 10.8279
10.8332
10.8386
10.8440
38
39
40
41		 4
4
4
4		 10.8493
10.8547
10.8601
10.8654
42
43
44
45		 4
4
4
5		 10.8708
10.8762
10.8815
13.9284
46
47
48
49		 5
5
5
5		 13.9338
13.9392
13.9445
13.9499
50
51
52
53		 5
5
5
5		 13.9553
13.9606
13.9660
13.9714
54
55
56
57		 5
5
5
6		 13.9768
13.9821
13.9875
17.0344
58
59
60
61		 6
6
6
6		 17.0398
17.0451
17.0505
17.0559
62
63
64
65		 6
6
6
6		 17.0612
17.0666
17.0720
17.0773
N T

W
66
67
68
69		 6
6
6
4		 17.0827
17.0881
17.0934
20.1403
70
71
72
73		 7
7
7
7		 20.1457
20.1511
20.1564
20.1618
74
75
76
77		 7
7
7
7		 20.1672
20.1725
20.1779
20.1833
78
79
80
81		 7
7
7
8		 20.1886
20.1940
20.1994
23.2463
82
83
84
85		 8
8
8
8		 23.2516
23.2570
23.2624
23.2677
86
87
88
89		 8
8
8
8		 23.2731
23.2785
23.2839
23.2892
90
91
92
93		 8
8
8
8		 23.2946
23.3000
23.3053
23.3107
94
95
96
97		 9
9
9
9		 26.3576
26.3630
26.3683
26.3737
98
99
100
101		 9
9
9
9		 26.3791
26.3844
26.3898
26.3952
102
103
104
105		 9
9
9
9		 26.4005
26.4059
26.4113
26.4166
106
107
108
109		 10
10
10
10		 29.4635
29.4689
29.4743
29.4796
110
111
112
113		 10
10
10
10		 29.4850
29.4904
29.4957
29.5011
114
115
116
117		 10
10
10
10		 29.5065
29.5118
29.5172
29.5226
118
119
120
 		 11
11
11
 		 32.5695
32.5748
32.5802
 

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