Disc sight glass DIN 7080

We supply round sight glasses standard in tempered borosilicate glass according to the DIN 7080 standard. The toughened safety glass withstands high pressures and high temperatures up to 280° C, if protected with mica up to 300° C and if used with non aggressive media up to 430° C.

Available sizes:

Below is an overview of all Maxos sight glasses with a diameter between Ø 30 mm and Ø 265 mm and thicknesses from 7 mm to 30 mm.

On request we deliver other sizes and materials (for example Quartz glass and metal fused sight glass) for high pressure, temperature and / or optical demands for measurements  (light transmittance spectrum etc.). Please check the Technical glass page for these items.

Maxos sight glasses sizes

Maxos Sight GlassSightPressure
Ø 24 x 10 mm*
Ø 14 mm
150 bar
Ø 30 x 12 mm*
Ø 16,6 mm
150 bar
Ø 30 x 15 mm*
Ø 16,6 mm
200 bar
Ø 31,6 x 12,75 mm*
Ø 20 mm
150 bar
Ø 33 x 14 mm*
Ø 20 mm
150 bar
Ø 34 x 17 mm*
Ø 24 mm
200 bar
Ø 35 x 7 mm*
Ø 25 mm
25 bar
Ø 40 x 10 mm*
Ø 30 mm
40 bar
Ø 40 x 12 mm*
Ø 30 mm
50 bar
Ø 44 x 10 mm*
Ø 32 mm
40 bar
Ø 44 x 12 mm*
Ø 32 mm
50 bar
Ø 45 x 10 mm
Ø 32 mm
40 bar
Ø 45 x 12 mm
Ø 32 mm
50 bar
Ø 50 x 10 mm
Ø 35 mm
25 bar
Ø 50 x 12 mm
Ø 35 mm
40 bar
Ø 55 x 6,5 mm*
Ø 40 mm
6 bar
Ø 55 x 10 mm*
Ø 40 mm
25 bar
Ø 60 x 10 mm
Ø 45 mm
16 bar
Ø 60 x 12 mm
Ø 45 mm
25 bar
Ø 60 x 15 mm
Ø 45 mm
40 bar
Ø 60 x 20 mm*
Ø 45 mm
95 bar
Ø 63 x 8 mm*
Ø 48 mm
8 bar
Ø 63 x 10 mm
Ø 48 mm
16 bar
Ø 63 x 12 mm
Ø 48 mm
25 bar
Ø 63 x 15 mm
Ø 48 mm
40 bar
Ø 65 x 10 mm*
Ø 50 mm
12 bar
Ø 65 x 15 mm*
Ø 50 mm
40 bar
Ø 70 x 12 mm*
Ø 55 mm
16 bar
Ø 70 x 15 mm*
Ø 55 mm
25 bar
Ø 75 x 12 mm*
Ø 60 mm
16 bar
Ø 80 x 10 mm*
Ø 65 mm
10 bar
Ø 80 x 12 mm
Ø 65 mm
16 bar
Ø 80 x 15 mm
Ø 65 mm
25 bar
Ø 80 x 20 mm
Ø 65 mm
40 bar
Ø 86 x 12 mm*
Ø 71 mm
10 bar
Ø 90 x 10 mm*
Ø 70 mm
8 bar
Ø 92 x 10 mm*
Ø 72 mm
8 bar
Ø 94 x 12 mm*
Ø 79 mm
10 bar
Ø 95 x 10 mm*
Ø 75 mm
6 bar
Ø 95 x 15 mm*
Ø 75 mm
16 bar
Ø 100 x 10 mm*
Ø 80 mm
7 bar
Ø 100 x 12 mm*
Ø 80 mm
10 bar
Ø 100 x 15 mm
Ø 80 mm
16 bar
Ø 100 x 20 mm
Ø 80 mm
25 bar
Ø 100 x 25 mm
Ø 80 mm
40 bar
Ø 105 x 15 mm*
Ø 80 mm
16 bar
Ø 110 x 12,5 mm*
Ø 85 mm
10 bar
Ø 110 x 20 mm*
Ø 90 mm
25 bar
Ø 113 x 15 mm*
Ø 88 mm
10 bar
Ø 115 x 15 mm*
Ø 90 mm
10 bar
Ø 120 x 10 mm*
Ø 100 mm
4 bar
Ø 120 x 15 mm*
Ø 100 mm
10 bar
Ø 120 x 18 mm*
Ø 100 mm
16 bar
Ø 125 x 15 mm
Ø 100 mm
10 bar
Ø 125 x 20 mm
Ø 100 mm
16 bar
Ø 125 x 25 mm
Ø 100 mm
25 bar
Ø 125 x 30 mm*
Ø 100 mm
40 bar
Ø 130 x 15 mm*
Ø 105 mm
10 bar
Ø 135 x 15 mm*
Ø 110 mm
8 bar
Ø 135 x 25 mm
Ø 110 mm
25 bar
Ø 140 x 15 mm*
Ø 115 mm
8 bar
Ø 150 x 10 mm*
Ø 125 mm
2 bar
Ø 150 x 15 mm*
Ø 125 mm
8 bar
Ø 150 x 20 mm
Ø 125 mm
10 bar
Ø 150 x 25 mm
Ø 125 mm
16 bar
Ø 150 x 30 mm
Ø 125 mm
25 bar
Ø 160 x 20 mm*
Ø 135 mm
12 bar
Ø 170 x 15 mm*
Ø 145 mm
5 bar
Ø 170 x 20 mm*
Ø 145 mm
8 bar
Ø 175 x 20 mm
Ø 150 mm
10 bar
Ø 175 x 25 mm
Ø 150 mm
16 bar
Ø 175 x 30 mm
Ø 150 mm
25 bar
Ø 200 x 20 mm
Ø 175 mm
8 bar
Ø 200 x 25 mm
Ø 175 mm
10 bar
Ø 200 x 30 mm
Ø 175 mm
16 bar
Ø 210 x 25 mm*
Ø 185 mm
10 bar
Ø 250 x 20 mm*
Ø 225 mm
4 bar
Ø 250 x 25 mm
Ø 225 mm
8 bar
Ø 250 x 30 mm
Ø 225 mm
10 bar
Ø 265 x 30 mm
Ø 240 mm
8 bar

The DIN 7080 standard describes the glass quality and dimensions of the round sight glasses. The round sight glasses marked with * are not DIN 7080 sizes, but they are produced according to DIN 7080 and thus meet the same high quality standards.

Glass thickness calculation

Maxos Glass Calculate Maxos view drawing

Diemensional tolerances DIN 7080

Diameter:Up to Ø 125 mm
Above Ø 125 up to Ø 200 mm
Above Ø 200 mm		± 0,5 mm
± 0,8 mm
± 1,0 mm
Thickness:Up to 20 mm
Above 20 mm		+ 0,5 / – 0,25 mm
+ 0,8 / – 0,40 mm

Technical characteristics:

Thermal shock resistance:∆T 265 K
Max. temperature:280° C *)
Max. temperature with micashield:300° C
Max. temperature with steam: 243° C
Max. temperature with steam and micashield:300° C
Max. temperature with non-aggressive media:430° C
Minimum temperature: limitless
Bending strenght:≥ 160N/mm²
Surface compressive stress:≥ 100-140 N/mm²
Parallelism:Up to Ø 100 mm
Above Ø 100 up to Ø 150 mm
Above Ø 200 mm 		≤ 0,20 mm
≤ 0,25 mm

≤ 0,30 mm

Flatness: Up to Ø 100 mm
Above Ø 100 up to Ø 150 mm
Above Ø 150 up to Ø 200 mm
Above Ø 200 mm		≤ 0,05 mm

≤ 0,08 mm

≤ 0,12 mm

≤ 0,15 mm

⃰ ) When operating temperature exceeds 280° C, a permanent drop in the prestress is to be expected if no suitable measures are taken. The actual maximum permissible load on a sight glass always depends on the specific service conditions in question (pressure, temperature, nature of medium, type of armature).