3.010 
3/8-24 3/4" deep 
8 places on 6-1/4" 
DBC 
1/4-28 3/4" deep 
8 places on 7-1/4 DBC 
Figure 2b. Dimensions of window seat and opening diameter in the test 
flange for the 4.5-inch diameter EDU window; the seat and 
opening in the test flange are the same as in the EDU 
chamber window flanges. 
