What are the markings on a Grade 5 bolt?

What are the markings on a Grade 5 bolt?

Bolt Grade Markings and Strength Chart

Head Marking Grade and Material Mechanical Properties
Min. Yield Strength (psi)
3 Radial Lines Grade 5 Medium carbon steel, quenched and tempered 92,000
6 Radial Lines Grade 8 Medium carbon alloy steel, quenched and tempered 130,000

How can you tell the difference between Grade 8 and Grade 5 bolts?

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. Grade G is roughly equivalent to Grade 8.

What is the difference between Grade 2 and Grade 5 bolts?

Grade 2 is a standard hardware grade steel. This is the most common grade of steel fastener and is the least expensive. Except a possible manufacturer’s mark,Grade 2 bolts have no head marking. Grade 5 bolts are hardened to increase strength and are the most common bolts found in automotive applications.

How do I identify a bolt?

Fasteners are identified by four or five attributes; Type, Material, Diameter, Length, and Thread Pitch or Count (machine thread fasteners only).

What are Grade 5 bolts used for?

These bolts are generally used for non-critical joints and applications. A grade 5 bolt is distinguished by 3 radial lines and promises tensile strengths between 105,000 and 120,000 psi. They are most commonly found in automotive applications.

How do you tell the grade of a bolt?

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.

Are Grade 5 bolts rust proof?

Many other grades exist but are used far less often. Grade 2, 5, and 8 are usually plated with a slightly blue-ish or yellow zinc coating, or are galvanized, to resist corrosion.

Will a Grade 5 bolt shear?

For example, an SAE grade 5 hex cap screw has a specified minimum tensile strength of 120,000 psi. Therefore, for design purposes, its shear strength could be reasonably assumed to be 70,000 psi.”

How hard 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.

What material is a Grade 5 bolt made of?

alloy steel
Grade 5. Grade 5 alloy steel is a medium carbon zinc plated alloy steel that is heat treated to increase hardness. Grade 5 bolts have three (3) evenly spaced hash marks on the head markings (manufacturers mark may also be included).

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.

What grade bolt should I use?

The standard strength grade (or Property Class as it is known in the standards) for many industries is 8.8. On the head of the bolt, 8.8 should be marked together with a mark to indicate the manufacturer.

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.

What is a standard bolt grade?

Bolt grades include a grading of 2, 5, 8 and 18-8 stainless in the U.S. grade systems. The grade is determined by the material used to construct the bolt and the material properties of the bolt.

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