Glass, optical, mil-g-174, grade c, type 517-645 or 523-586. Both surfaces polished and coated with magnesium fluoride, rim and chamfers ground. Dimensions, 5.000 in. O/a lg, 3.875 in. O/a w, 0.125 in. Thick, both ends rounded on a 1.937 in. Radius. Two mtg slots along each side of length 0.125 in. W, 0.156 in. O/a depth on 0.625 in. Mtg centers. All edges chamfered 0.010 in. By 45 deg. Furnished with 2 gaskets.
No other part numbers with same form, fit, and function found.
NSN 5935-01-625-2928
NSN 6240-00-827-0889
NSN 6645-01-024-2133
NSN 6620-00-488-0626
NSN 5915-01-484-1505
NSN 5915-01-534-7614
NSN 5998-01-076-8367
NSN 6105-01-185-7982
NSN 2925-00-305-8030
NSN 5855-00-782-7714
NSN 5998-00-951-9597
NSN 5905-01-475-7800
Last Updated: 03/27/2025