What grade are hardened bolts?
Grade 5 bolts are case hardened, meaning the bolt has been heated enough to hardened the outside of the bolt but not enough to harden the inside portion. Grade 5 bolts are identified by 3 evenly spaced radial lines on the head.
Are Grade 8 bolts hardened steel?
The case hardened or through hardened grade 8 bolt has been really cooked. Not only is the outside crispy, but you would be hard pressed to put a fork in it as it has been hardened by heat treatment all the way through. It is made with medium alloy steel. but they will all be raw, cooked some, or cooked through.
Are Grade 2 bolts hardened?
High Carbon Vs Low Carbon Hardenability Higher carbon steels can be hardened, while low carbon steels are considered non-hardenable. The steel in low-strength ASTM A307 or SAE Grade 2 fasteners is a low carbon grade, such as AISI 1018 or 1020.
What number is a hardened bolt?
Grade 5 bolts are hardened to increase strength and are the most common bolts found in automotive applications. Grade 5 bolts have 3 evenly spaced radial lines on the head.
What is a Grade 9 bolt?
Grade 9 structural bolts, also known as grade 9 hex cap screws, are one the strongest structural bolts that can be used today. While the typical grade 8 bolt has a tensile strength of 150,000 PSI, a grade 9 bolt has a tensile strength of 180,000PSI.
What is a Class 10 bolt?
Class 10. This is a metric nut grading similar to the SAE grade 8 classification, which is used in conjunction with Class 10.9 bolts. This strength of nut is used in automotive, and structural industries, as well as in high temp applications.
Is a 10.9 bolt hardened?
Hex bolts, stud bolt, threaded rod and screws property classes is consists of two numbers which can be separated by a decimal point such as 8.8, 10.9, 12.9, and 14.9….ISO 7380 Button Head Socket Cap Screws.
| Property Class | 10.9 |
|---|---|
| Hardness (HRC) | 32-39 |
| Tensile Strength (Mpa) | 835 min. |
How can I tell what grade a bolt is?
You can usually figure out the grade, or strength, of a bolt by looking at the markings on its head. English bolts (U.S.S. or S.A.E) are categorized by grade, from grade 2 to grade 8, where the grade represents inch strength. The higher the grade, the stronger the bolt.
How do I determine bolt grades?
Determine the grade of the bolt. The grade describes the grade of metal or the type of material used to manufacture the bolt. The grade of the bolt may be indicated by markings on the head. In the example, Grade 2 signifies a soft steel was used to make the bolt. Look at the head of the bolt. The shape of the head indicates what type of bolt it is.
How strong are Grade 8 bolts?
Grade 8 Bolts. A grade 8 bolt is stronger than the more commonly used grade 5. It is made of alloy steel and has six radial lines on the top of the bolt head. Grade 8 bolts have a tensile strength of 150,000 pounds per square inch. We recommend using grade 8 nuts, flat washers and high alloy lock washers with any grade 8 bolts / hex cap screws.
How is the grade strength of a bolt determined?
Bolt grades indicate the strength of a bolt, which is important when selecting a fastener so you can be sure the bolt is strong enough for the job. The material used to construct the bolt and the material properties of the bolt determine the grade.
Are Grade 8 bolts more brittle than Grade 5?
It is true that grade 8 bolts are more brittle than grade 5. In general (although not always the case), steels that have a higher strength are less ductile . Grade 8 bolts have a higher strength and, therefore, would require fewer bolts in a joint than grade 5.