What is the meaning of 8.8 grade in a bolt?
The two figures indicate the tensile and yield strengths of the bolt or screw. In the case of a 8.8 grade bolt the first figure signifies that the Tensile Strength is at least 800MPa. The second figure signifies that the fastener will begin to yield at 80% of the Ultimate Tensile Strength, i.e. at least 640MPa.
What is the meaning of 8.8 grade steel?
Grade 8.8 high tensile steel is often referred to as the structural grade for bolts. It is the most common form of high tensile material and is usually stocked in plain finish or zinc. It can be plated in many other coatings.
Is Grade 8 and 8.8 the same?
Q: I’m specifying the strength of a metric fastener and need your help. Is Class 8.8 the same as Grade 8? A: The answer is no. Class 8.8 is not the same as Grade 8.
How hard is a Class 8.8 bolt?
In a partially or fully annealed condition, the tensile strength of the 8.8 Hex Bolt is around 420 Mpa for low carbon steel and 500 Mpa for medium carbon steel, its core hardness in terms of Rockwell lies between B71 – 95. The surface hardness of the 8.8 Metric Bolt can be increased through carburizing.
Are grade 8.8 bolts heat treated?
Grade 8.8 Bolts belong to the DIN 933 grade 8.8 standard. This is a structural grade for bolts. This is a medium carbon steel bolt specification. These bolts are heat treated by quenched and tempered methods.
How much weight can a 8.8 bolt hold?
For example, a grade 12.9 bolt will not snap until every square millimetre of the bolt cross section is carrying a load of at least 120 kg. Similarly a grade 8.8 bolt will not snap until it is carrying a load of 80kg per square millimetre.
Are grade 8.8 bolts Galvanised?
1. Grade 8.8 Hex Bolts are available in Hot-Dip Galvanised Finish.
What is the class of ASTM F568M steel?
ASTM F568 Class 8.8.3 D ASTM F568M We can provide a variety of regular size ASTM F568 Class 8.8.3 D ASTM F568M steel plates, ASTM F568 Class 8.8.3 D ASTM F568M steel coils, ASTM F568 Class 8.8.3 D ASTM F568M steel bars, structural steel, if you have special requirements, please contact us to provide you with customized services..
What is the standard for mechanical properties of fasteners?
It defines mechanical properties for fasteners that range from M1.6 to 100 in diameter. The standard was withdrawn in 2012. and has been replaced by ISO 898-1
What are Class 8 3 bolts and screws?
1. 4 Classes 8. 8. 3 and 10. 9. 3 bolts, screws, and studs have atmospheric corrosion resistance and weathering characteristics comparable to those of the steels covered in Specification A 588. The atmospheric corrosion resistance of these steels is substantially better than that of carbon steel with or without copper addition. See 5. 2.