The DIN 9021 washer is a wide flat washer designed to distribute pressure and protect the contact surface. Its outer diameter is approximately three times that of the nominal internal diameter. When used between the screw head or nut and the support material, it provides a large bearing surface, limiting friction and ensuring even load distribution. These washers are commonly used in various applications, from M3 to M36 sizes.
Product Data
Size
d
D
s
M3
3.2
9
0.8
M4
4.3
12
1.0
M5
5.3
15
1.2
M6
6.4
18
1.6
M8
8.4
24
2.0
M10
10.5
30
2.5
M12
13
37
3.0
M14
15
44
3.0
M16
17
50
3.0
M18
20
56
4.0
M20
22
60
4.0
M22
24
66
5.0
M24
26
72
5.0
M27
30
85
6.0
M30
33
92
6.0
M33
36
105
6.0
M36
39
110
8.0
Applications
Building Insulation: Primarily used in the installation of thermal insulation systems in residential, commercial, and industrial buildings.
External Wall Insulation: Often used in External Thermal Insulation Composite Systems (ETICS) to fix insulation boards to external walls.
Roof Insulation: Suitable for securing insulation materials on roofs to enhance energy efficiency and thermal performance.
Floor Insulation: Utilized in floor insulation systems to prevent heat loss through the flooring and improve overall energy efficiency.
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