What is 8.8 Hardness?
What is 8.8 Hardness?
Mechanical properties
| Grade, material & condition | Nominal thread diameter size range [mm] | Core hardness [Rockwell] |
|---|---|---|
| Class 5.8 Low or medium carbon steel; cold worked | 5–24 | B82–95 |
| Class 8.8 Medium carbon steel; quench and tempered | Under 16 (inc.) | C18-31 |
| 17–72 | C23–34 | |
| Class 8.8 low carbon Low carbon boron steel; quench and tempered |
What does 8.8 mean?
Bolt Grade Markings and Strength Chart
| Grade and Material | Nominal Size Range (inches) |
|---|---|
| Class 8.8 Medium carbon steel, quenched and tempered | All sizes below 16mm |
| 16mm – 72mm | |
| Class 10.9 Alloy steel, quenched and tempered | 5mm – 100mm |
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.
What is class 8.8 steel?
High tensile steel bolts 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.
What is a grade 8.8 bolt?
Grade 8.8 Bolts are manufactured using medium carbon steel that has been quenched and tempered. Used in railroad equipment, motors, engines and processing equipment, grade 8.8 bolts exhibit good tensile strength and perform well in most environments.
What steel is used for 8.8 bolts?
medium carbon steel
Often, the Din 933 Grade 8.8 Standard is referred to as the structural grade for bolts. The specification Bs 3692 Grade 8.8 standard fasteners are manufactured using medium carbon steel. This medium carbon steel has been treated to heat by both quenching and tempering.
What does 8.8 on a bolt mean?
So, in English, a Property Class 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of that nominal tensile strength, so 640 MPa.
What does 8.8 bolt mean?
What does 8.8 mean on a metric bolt?
How hard is a 8.8 bolt?
Class 8.8 is hardened, but it is not as strong as class 10.9. It is commonly found in automotive applications. Class 8.8 is similar to grade 5. Zinc plated for moderate corrosion resistance.
What is meant by 8.8 grade bolt?
What is 8.8 bolt material?
Is a metric 8.8 a Grade 8?
As you can see from the table below, a metric Class 8.8 is the equivalent of a Grade 5, not a Grade 8.
What is 8.8 on a metric bolt?
ISO 898-1 Property Class 8.8 Metric Bolt Head Marking 800 MPa are about 155 ksi. So a Property Class 8.8 bolt is a medium-strength fastener that’s roughly the same strength as an SAE J429 Grade 5 fastener.
Is 8.8 bolt high tensile?
