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Carbon steel Grade 4.8 8.8 10.8 10.9 bolt nut washers supplier

The specification for Iso Class 4.8 standard covers Grade 4.8 fasteners like Bolts/Screws/Studs. This type of fastener Class 4.8 Bolt could either have Coarse thread and fine pitch thread formation. The standard Class 4.8 Carbon Steel Bolt has been manufactured from Low or medium carbon Alloy Steel.

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ASTM F568 Grade 4.8 Bolts, ASTM F568 Grade 4.8 Studs, ASTM F568 Grade 4.8 Threaded Rods,  ASTM F568 Grade 4.8 Screws Supplier in China.

 

The performance grades of bolts for steel structure connection are 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 and 12.9. The bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are heat treated (quenched and tempered). Carbon steel grade 4.8 bolts are commonly referred to as high strength bolts, and the others are commonly referred to as ordinary bolts. The grade label of carbon steel grade 4.8 bolt performance consists of two parts, which represent the nominal tensile strength and yield strength ratio of bolt material. 48 is 4.8.

 

The thread construction of this type of fastener Class 4.8 Bolt could be coarse or fine pitch. Low to medium carbon Alloy Steel was used to make the standard Class 4.8 Carbon Steel Bolt. These carbon steel grade 4.8 bolts are less expensive and less durable. The tensile strength of Grade 4.8 Nuts in a partially or fully annealed condition is roughly 420 Mpa for low carbon steel and 500 Mpa for medium carbon steel, and its core hardness in terms of Rockwell is between B71 and 95. Carburizing can improve the surface hardness of the Grade 4.8 Mild Steel Bolt.

 

Chemical Composition

Strength grade/ class Material and heat treatment Chemical composition (analysis on the product) % Minimum hardening temperature
C P S B
min max max max max
Grade 4.8 Carbon steel 0,13 0,55 0,050 0,060 Not specified

 

Mechanical Properties

High Tensile Grade/ Class Material Proof strength Yield strength (min.) Tensile strength (min.) Core hardness (Rockwell)
Class 4.8 Low or medium carbon steel 310 Mpa 340 Mpa 420 Mpa B71-95
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