High strength domed cap nuts are special fasteners that work really well mechanically and also look nice and finished. They have got a rounded, dome-shaped top,you can tell them apart by that. These nuts fully cover the threaded end of a bolt or stud, so you get a smooth surface that won’t catch on things.
Made for tough uses, these domed cap nuts can hold loads better and are safer than regular hex nuts. They’re the go-to choice in all kinds of assembly work where both a strong structure and a clean, neat look are really important.

Mon
M4
M5
M6
M8
M10
M12
M14
M16
M20
P
0.7
0.8
1
1.25
1.5
1.75
2
2
2.5
s
7
8
10
13
17
19
22
24
30
h
8.5
11
13
16
19
22
25
28
34
dk
6.5
7.5
9.5
12.5
16
18
21
23
29
k
3.2
4
5
6.5
8
10
11
13
16
The best thing about high strength domed cap nuts is their tensile and yield strength,way better than regular cap nuts. They get this strength from using good alloy steel and careful manufacturing steps, like cold forging followed by precise heat treatment (quenching and tempering).
These nuts can handle heavy vibrations, strong tension, and sudden impacts without any problem,they won’t strip or break. That’s why they’re needed for important structural connections,places where safety and reliability just can’t be skimped on.
Q:What specific material grade guarantees the 'high strength' claim for your domed cap nuts?
A:Our high strength domed cap nuts are made from Grade 8 steel,same as ISO 898-2 Class 10. They can take at least 150,000 PSI of tensile strength and have a hardness of RC 32-39. This material goes through strict heat treatment, so they stay strong and hold up well consistently. They hold up reliably even when there’s heavy weight or vibrations.