MIL-DTL-16356E
TABLE IV. Sizes (length) of glasses and type I gaskets.
Metric Size
Size
L +0.000 -0.031
L × W × Thick
(Number/Code)
(Inches)
(Millimeters)
0
3¾
-
1
4½
115 × 34 × 17
2
5½
140 × 34 × 17
3
6½
165 × 34 × 17
4
7½
190 × 34 × 17
85/6
5
220 × 34 × 17
9⅞
6
250 × 34 × 17
7
11
280 × 34 × 17
7M
11 (22-degree bevel)
280 × 34 × 17
125/8
8
320 × 34 × 17
133/8
9
340 × 34 × 17
10
14½
370 × 34 × 17
11
15¾
400 × 34 × 17
3.12.3.1.1 Glass faces. The front and back faces of the glasses shall be parallel within 0.004 inch. All
replacement glass supplied under this document shall have a minimum flatness tolerance of 0.002 inch for glass up
to and including Size 3, 0.003 inch for glass Sizes 4 and 5, and 0.005 inch for sizes above Size 5. Glass panes
meeting these requirements should be acceptable for current Navy applications considered High Pressure (HP)
service (see 6.1).
3.12.3.1.2 Glass uniformity. Glass shall contain no scratches or streaks, be uniform in thickness, straight on the
sides, free from twist or warp, and shall be free from irregularities which would cause false indication of water level
meniscus. The glass shall contain no more than 12 air bubbles (inclusions) over all with a maximum bubble
diameter of 0.031 inch, and shall contain no more than six air bubbles within the viewing range of the glass. Air
bubbles shall not be located in any pattern as to cause false indication of water level. No more than three solid
inclusions are permitted per pane, and they shall not be greater than 1/32 inch in diameter.
3.12.3.2 Thermal shock resistance. Glass shall not crack or spall when tested as specified in 4.7.7.5.
3.12.3.2.1 Fracture resistance. Glass shall be tempered so that only an interlocking type fracture shall occur
when tested as specified in 4.7.7.6.
3.12.3.3 Simulative service. Glass shall be smooth and transparent and shall show no erosion of the surfaces
after being subjected to the test specified in 4.7.7.9. Simulative service testing is not required for Class I glass sets
using standard reinforced graphite gaskets installed in gauges with conventional flat gasket seating surfaces. Gauges
using special design seating surfaces (grooved, tapered, curved, or with less than Ra = 400 finish) will require
testing. When simulative service testing is not done, the first article test of 4.7.7.7 and verification test of 4.7.7.8
shall be accomplished on samples of glass from the set.
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