What is the difference between a Grade 2 and Grade 5 bolt?

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.

Is a Grade 5 bolt stronger than a Grade 2?

The higher the ISO numbers are, the stronger the bolt. A metric bolt designated as ISO class 6.8 roughly corresponds in strength to an SAE Grade 2 bolt. Bolts of ISO class 8.8 and the slightly stronger class 9.8 roughly correspond to an SAE Grade 5 bolt.

Is a Grade 2 bolt strong?

Grade 2 hex head bolts are made from low to medium strength carbon steel and offer a tensile strength of 60,000 to 74,000 psi, depending on the diameter.

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.

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What’s the best grade of 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.

Are stainless steel bolts stronger than Grade 5?

Stainless Steel Grades & Strength

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.

How much weight can a Grade 5 bolt hold?

Proof Load

Nom Bolt Size (in) Grade
2 5
5/16 2900 4450
3/8 4250 6600
7/16 5850 9050

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). If your application calls for heavier materials, you may need Grade 8 Bolts because they are the hardest and are often used in heavy manufacturing applications.

Is grade A the same as Grade 5?

Because there are so many different grades and fasteners all look about the same, medium carbon and alloy steel strength grades are marked for identification.

Table 1.

Grade/Class Strength
Grade 2 Low strength.
Grade 2H Nuts Strength is similar to Grade 5. Use with ASTM A325 structural bolts.
Grade 5 Medium strength.

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
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How can you tell if a bolt is a Grade 5?

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.

Whats stronger Grade 8 or 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. Grade 8 bolts have 6 evenly spaced radial lines on the head. Grade G is roughly equivalent to Grade 8.

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.”

Is grade A the same as Grade 2?

A2. A type of the most common stainless steel grade. It is comparable in strength to grade 2 materials, yet slightly weaker and easy to weld.

What is the strongest bolt made?

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 bolts have the best shear strength?

12.9 Bolt Shear Capacity

  • 12.9 Bolts. A 12.9 bolt is one of the highest grade of bolts produced. Known for their high tensile strength, they are built with both hex and Torx heads and are available in zinc or chrome finishes. …
  • 12.9 Shear Strength. The minimum tensile strength of a 12.9 bolt is 1220 MPa.
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