Structural Hardened Lock Washer F436 is flat structural washers made of hardened steel for heavy-duty applications. They are designed for use with A325 structural bolts, studs, and nuts. These washers are often employed in construction applications, including buildings, bridges, and other structures. The chemical, mechanical, and dimensional requirements for these washers are covered under the ASTM specification F436. They are through hardened or carburized to add strength, yet physically smaller than a standard F844 flat washer.
Product Data
Size
d
D
s
M3
3.2
7
0.5
M4
4.3
9
0.8
M5
5.3
10
1.0
M6
6.4
12
1.6
M8
8.4
16
1.6
M10
10.5
20
2.0
M12
13
24
2.5
M14
15
28
2.5
M16
17
30
3.0
M18
19
34
3.0
M20
21
37
3.0
M22
23
39
3.0
M24
25
44
4.0
M27
28
50
4.0
M30
31
56
4.0
M33
34
60
5.0
M36
37
66
5.0
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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