Omni Gear and Machine Corporation - 90 Bissel Street - Joliet, Illinois 60432

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.