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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. ... A grade 8 bolt will have 6 radial lines on its head.
- What does #8 bolt mean?
- What do the numbers mean on bolt heads?
- What does 8.8 mark on a bolt means?
- Is Grade 8 or 10.9 stronger?
- What are Grade 8 bolts used for?
- Is a Grade 8 bolt stronger than a Grade 5 bolt?
- How strong is a Grade 8 bolt?
- How hard is a Grade 8 bolt?
- Does M8 mean 8mm?
- Is Grade 8 the strongest bolt?
- What type of steel are Grade 8 bolts made from?
What does #8 bolt mean?
Their size is described as diameter, number of threads per inch (if used with a nut or in a threaded hole), and length in inches. ... In all cases, the larger the number, the larger the size. Consequently a #8 screw is larger than a #4 screw, just as a 3 inch bolt is larger than a 2 inch bolt.
What do the numbers mean on bolt heads?
Bolt Grade Markings
Each grade has a specific bolt strength. No matter the system used to grade the bolts, the higher number means the stronger the bolt. For most home and automotive applications, you won't need anything more than a grade 8 bolt strength or metric class 10.9.
What does 8.8 mark on a bolt means?
So, in English, a PC 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of the bolt's nominal tensile strength, or 640 MPa.
Is Grade 8 or 10.9 stronger?
Class 10.9 is stronger than class 8.8. It is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8. A low carbon steel for general use.
What are Grade 8 bolts used for?
Grade 8 fasteners are considered hi-strength / high-tensile fasteners and are used in many highly industrial applications such as machinery, valves, pumps, vessels, motors, tractors, and even tanks… Although it may seem like a bolt is a bolt, there are significant differences in how each bolt is manufactured.
Is a Grade 8 bolt stronger than a Grade 5 bolt?
Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions.
How strong is a Grade 8 bolt?
The nominal size of the grade 8 bolts can be from 1/4″ to 1 1/2″. The minimum yield strength of this grade bolt is 130,000 psi. A maximum of 120,000 psi of tensile force (proof load) can be applied to grade 8 bolts.
How hard is a Grade 8 bolt?
A grade 8 bolt is the highest grade SAE bolt. Grade 8 bolts have a minimum tensile strength of 150,000 PSI.
Does M8 mean 8mm?
Hole Sizes for Metric Bolts
The defined diameter of metric bolts is actually slightly larger than the actual diameter of the bolt shaft. So an M8 bolt would have a shaft diameter that's slightly under 8mm which means that the bolt should fit through an 8mm hole.
Is Grade 8 the strongest bolt?
Commercial-grade 8 bolts are the strongest option available. They're made from medium carbon alloy steel and have markings that include six raised dashes. The psi of the bolt is 150,000, meaning that it can withstand great deals of pressure because of the way it was quenched and tempered.
What type of steel are Grade 8 bolts made from?
Grade 8 (SAE J429) is a medium carbon alloy steel with one of the highest tensile strengths available. With a minimum tensile strength of 150 ksi and a minimum yield of 130 ksi, Grade 8 has a higher tensile and yield strength than other steel grades such as Grade 5 and B7.
