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Copyright © 2004
Omni Gear and Machine Corporation
All rights reserved.

Technical Gear Information

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CIRCULAR PITCH CONVERSION CHART

Helical Gear
Conversion Chart

 
Circular Pitch Diametral Picth Module Whole Depth
2.157/DP 2.25/DP
1/16
1/8
3/16
1/4
50.2654
25.1327
16.7551
12.5663
0.5053
1.0106
1.5160
2.0213
0.0429
0.0858
0.1287
0.1716
0.0448
0.0895
0.1343
0.1791
5/16
3/8
7/16
1/2
10.053
8.3775
7.1807
6.2831
2.5266
3.0319
3.5373
4.0426
0.2146
0.2575
0.3004
0.3433
0.2238
0.2686
0.3133
0.3581
9/16
5/8
1  1/16
3/4
5.5850
5.0265
4.5695
4.1887
4.5479
5.0532
5.5586
6.0639
0.3862
0.4291
0.4720
0.5150
0.4028
0.4476
0.4924
0.5371
13/16
7/8
15/16
1
3.8665
3.5904
3.3510
3.1416
6.5692
7.0744
7.5798
8.0851
0.5579
0.6008
0.6437
0.6866
0.5815
0.6267
0.6714
0.7162
1 1/8
1 1/4
1 1/2
1 3/4
2.7925
0.25133
2.0944
1.7952
9.0958
10.1062
12.1276
14.1488
0.7724
0.8582
1.0299
1.2015
0.8057
0.8952
1.0743
1.2533
2
2 1/2
3
1.5708
1.2567
1.0472
16.1701
20.2117
24.2452
1.3732
1.7164
2.0598
1.4329
1.7904
2.1486

 

INVOLUTE SPLINE CHART

 
 
30° Involute Spline 37 1/2° & 45°  Involute
Diam. Pitch Whole Depth Whole Depth
Full Fillet Flat Root 37 1/2° PA 45° PA
2.5/5
 
 
 
0.5600
0.4667
0.3500
0.2800
0.4700
0.3917
0.2940
0.2350
0.5060
0.4178
0.3133
0.2540
 
 
 
 
 
 
 
 
0.2333
0.1750
0.1400
0.1250
0.1960
0.1470
0.1180
0.0980
0.2078
0.1557
0.1245
0.1040
 
0.131
0.105
0.0901
 
 
 
0.0937
0.0803
0.0750
0.0625
0.0730
0.0635
0.0590
0.0490
0.0785
 
0.0600
0.0510
0.0656
 
0.0525
0.0438
 
 
 
0.0469
0.0375
0.0313
0.0370
0.0295
0.0249
0.0385
0.0315
0.0265
0.0328
0.0263
0.0219
Note: These depth are considered standard byAsh Gear and may be used as a quick reference guide for your convenience.
However, this data does not necessarily reflect any single set of published standards, so always check your specific requirements.

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Reprinted from Ash Gear & Supply
Omni Gear and Machine Corporation -
90 Bissel Street - Joliet, Illinois 60432
Toll Free: (800) 876-7216 - Fax: (815) 723-9207