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. Grade F is roughly equivalent to Grade 5..
Similarly one may ask, what is a Grade 5 bolt?
Grade 5 Bolts and fasteners are made of medium strength carbon steel and are specified under the Society of Automotive Engineers (SAE). These bolts are heat treated in a controlled atmosphere from 1⁄4 in. through 1-1/2 in. with a minimum tensile strength of 120,000 psi in diameters through 1 in.
Furthermore, how strong is a Grade 5 bolt? Bolt Grade Markings and Strength Chart
| Head Marking | Grade and Material | Mechanical Properties |
| Min. Tensile Strength (psi) |
| 3 Radial Lines | Grade 5 Medium carbon steel, quenched and tempered | 120,000 |
| 105,000 |
| 6 Radial Lines | Grade 8 Medium carbon alloy steel, quenched and tempered | 150,000 |
Besides, should I use Grade 5 or Grade 8 bolts?
In actual fact, Grade 5 bolts are often preferred over Grade 8 . A Grade 8 has a very high tensile strength, but can be brittle. It's often much safer to use a Grade 5 bolt which will bend, thus providing a warning, rather than a Grade 8 bolt breaking without warning.
What are the different grades of bolts?
The most common grading system used for bolts in the U.S. is the SAE system, but you can find metric grading systems as well. There are several grades of bolts but the three common grades for SAE are 2, 5 and 8. The common class (grades) for metric are 5.8, 8.8, 10.9 and 12.9. Each grade has a specific bolt strength.
Related Question Answers
What is the strongest bolt grade?
The strongest commercial-quality bolt is grade 8, marked by six raised dashes; its medium-carbon alloy steel has been quenched and tempered to achieve a tensile strength of 150,000 psi.How much weight can a Grade 5 bolt hold?
SAE Bolt Strength
| Bolt Safe Working Loads (lbs) (Safe tensile load at 6,000 psi load) (Safe shear strength at 7500 psi load) |
| BoltDia(in) | NF Thread Grade 2 Iron Bolt |
| 1/4 | 200 | 370 |
| 5/16 | 340 | 575 |
| 3/8 | 510 | 830 |
Is Grade 8 or 10.9 stronger?
Class 10.9 is stronger than class 8.8, and is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8. A low carbon steel for general use.What material is a Grade 5 bolt made of?
steel
Will Grade 8 bolts rust?
According to K-T Bolt Manufacturing Inc., Grade 8 bolts "are used in demanding applications such as automotive suspensions. Grade 8 bolts have 6 evenly spaced radial lines on the head." Unlike stainless steel, which is highly resistant to corrosion, steel, however reinforced, will oxidize over time and rust.What is Grade a307?
A307 Grades Heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges. The end of a grade C anchor bolt intended to project from the concrete will be painted green for identification purposes. Permanent marking is a supplemental requirement.Is 8.8 bolt high tensile?
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 a Grade 5 bolt stronger than Grade 8?
Grade 8 / Grade G 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. Grade 8 bolts have 6 evenly spaced radial lines on the head.What is the difference between Grade 5 and Grade 8?
Grade 8 is "stronger" as in tensile strength or force it takes to break it, but when they go the snap. Grade 5 will flex as it fails and tend distort and stretch and may actually hold together a bit.How strong is a 3/8 bolt?
A 3/8-inch bolt of this type is rated to 7,000 pounds in 6,000 psi concrete (basically granite) and 4,000 pounds in 2,000 psi concrete (hard sandstone). This is roughly the breaking strength range of carabiners and much higher than any rope's maximum possible impact force.Is a Grade 8 bolt stronger than stainless steel?
Stainless steel bolts are rated for corrosion resistance. Bolt strength is rated in PSI (pounds per square inch). A stainless steel bolt has the same PSI rating as a grade 5 bolt (125,000 PSI). A grade 8 bolt has a stronger rating with a PSI of 150,000.What does the grade of bolts mean?
Grade 2 bolts ( A307) are a standard hardware grade steel. This is the least expensive and most common. They have a tensile strength of 60,000 PSI. Grade 5 bolts are a heat treated carbon bolt. Hardened to increase its strength, it's most commonly found in automotive applications.How do you know if a bolt is grade 8?
Grade 8 Bolts They are fully heat treated all the way through which create a bolt that is very hard but somewhat brittle. Because of their hardness, grade 8 bolts are more likely to snap off than bend under extreme loads. Grade 8 bolts are identifiable by 6 evenly spaced radial lines on the head.Is there a grade 10 bolt?
There's no such thing as a grade 10. There's a 10.9 in metric. From the course I sat thru a couple months back grade 8 is the strongest bolt grade for SAE sizes.Are Grade 8 bolts hard?
Grade 8 bolts are medium carbon alloy steel, quenched and tempered at a minimum temperature of 800 degrees Fahrenheit. They are then heat-treated to achieve a hardness of 33 to 39 on the Rockwell C scale.Can you drill Grade 8 bolts?
Grade 8 bolts are softer than Rc 40 and normally present no problem in drilling. Drill thru with a 1/8" drill first to lessen the required thrust on the larger drill.How strong is a grade 12.9 bolt?
The minimum tensile strength of a 12.9 bolt is 1220 MPa. Therefore, the approximate shear strength of a 12.9 bolt is 732 MPa. The minimum yield strength of a bolt is the pressures needed to stretch the metal of the bolt. A 12.9 bolt has a minimum yield strength of 1100 MPa.What is the difference between Grade 2 and Grade 5 bolts?
Grade 2 – bolts manufactured from low or medium carbon steel. Grade 5 – bolts manufactured from medium carbon steel. Grade 8 – bolts manufactured from medium carbon alloy steel.What grade is a 12.9 bolt?
The 12.9 is the Class head marking under ASTM F568M standard for Bolts of a high grade (1220 MPa), being Alloy steel, quenched and tempered. ASTM F568M is an ASTM International standard for metric bolts, screws and studs that are used in general engineering applications. 
