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Grade 4.8 nuts
Product Description: Grade 4.8 nuts are the most commonly used standard-strength nuts in industry, and their strength grade is compatible with Grade 4.8 bolts. Their main characteristics are low cost and high versatility, which make them suitable for connections with moderate strength requ...
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Product Description:
Main Characteristics and Definitions of Grades
The designation "Grade 4.8" serves as a key indicator of a nut's mechanical properties, with the classification based on national standards (e.g., GB/T 3098.2). Its specific meaning is as follows:
Interpretation of Grade Values
The first digit "4": Indicates the minimum nominal tensile strength of the nut is 400 MPa (megapascals), representing the minimum stress the nut can withstand before breaking under tension.
The second digit "8": Indicates the ratio of yield strength to tensile strength is 0.8. This gives a minimum yield strength of 400 MPa × 0.8 = 320 MPa. Yield strength refers to the maximum stress the nut can withstand before plastic deformation occurs, which directly determines its resistance to loosening and deformation.
Classification by Characteristics
It denotes a standard strength grade, which is not suitable for use under impact, vibration, or heavy load conditions. It is mainly intended for static, lightly loaded fixed connections.
Notes on Terminology & Standards
GB/T 3098.2: Retained in its original form as it is a Chinese national standard code (GB = Guobiao, "National Standard"; T = Tuijian, "Recommended"). This standard specifically specifies mechanical properties of fasteners (nuts) made of carbon steel and alloy steel.
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