Round nuts, as the name implies, are circular fastening components designed to secure parts onto threaded shafts or rods. Their smooth, circular outer profile provides a sleek appearance, while their internal threading allows for a snug fit with corresponding bolts or studs. With a combination of ease of installation and reliable locking capabilities, round nuts are widely utilized across various industries, ensuring stable connections in machinery, automotive, electrical equipment, and more.
|
Standard
|
Country/Region
|
Description
|
|
ISO 4035
|
International
|
Specifies dimensions, tolerances, and mechanical properties of round nuts
|
|
DIN 439
|
Germany
|
Defines thin round nuts with metric threads for lightweight applications
|
|
ASME B18.2.2
|
USA
|
Covers unified inch series round nuts, detailing thread specifications and types
|
|
GB/T 812 - 1988
|
China
|
Details product specifications for metric round nuts used in mechanical assemblies
|
|
JIS B 1185
|
Japan
|
Japanese standard for round nuts, including dimensional and strength requirements
|
|
Grade
|
Material
|
Tensile Strength (MPa)
|
Application Scenarios
|
|
4
|
Low-carbon steel (e.g., Q235)
|
400
|
General household items, light-duty machinery assembly
|
|
5
|
Low-carbon steel (e.g., Q235)
|
500
|
Common industrial equipment with moderate load demands
|
|
8
|
Medium-carbon steel (e.g., 45# steel)
|
800
|
Automotive parts, industrial machinery with high vibration
|
|
10
|
Alloy steel (e.g., 35CrMo)
|
1000
|
Heavy-duty machinery, construction equipment
|
|
12
|
Alloy steel (e.g., 40Cr)
|
1200
|
Extreme-load applications in aerospace and heavy trucks
|
|
A2-70 (Stainless Steel)
|
304 stainless steel
|
700
|
Corrosion-resistant environments like marine, food processing
|
|
A4-80 (Stainless Steel)
|
316 stainless steel
|
800
|
High-corrosion and high-temperature settings, such as chemical plants
|
|
Nylon
|
Nylon 6/6
|
-
|
Electrical insulation, reducing vibration and noise
|
|
Treatment Method
|
Abbreviation
|
Description
|
|
Zinc Plating
|
Zn
|
Basic rust protection, available in different colors (clear, blue, yellow) for general use
|
|
Hot-Dip Galvanizing
|
HDG
|
Excellent corrosion resistance, suitable for outdoor and heavy-industrial applications
|
|
Black Oxide Coating
|
Black
|
Creates a non-reflective black surface with moderate rust resistance, ideal for internal components
|
|
Dacromet Coating
|
Dacromet
|
Environmentally friendly, chromium-free coating offering high corrosion resistance and anti-galling properties
|
|
Nickel Plating
|
Ni
|
Enhances appearance and provides moderate corrosion resistance for decorative or semi-exposed parts
|
|
Chromium Plating
|
Cr
|
Improves hardness, wear resistance, and corrosion resistance for enhanced durability
|