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 5905-00-500-6555
NSN 5910-00-797-8726
NSN 5925-01-540-1616
NSN 5925-01-371-2772
NSN 5835-00-166-9413
NSN 6110-01-609-8873
NSN 5985-01-472-6637
NSN 4140-00-020-1835
NSN 5920-00-155-2173
NSN 5835-00-770-2843
NSN 6320-00-110-8005
NSN 5895-01-214-1902
Last Updated: 03/07/2025