What is a Grade 5 bolt?

Asked by: Marty Lewis

Manufactured from medium carbon steel and hardened for greater strength and durability, 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 or those that require medium strength.

Are Grade 5 bolts harder 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.

What grade bolt is strongest?

grade 8

Grade 9 Bolts
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.

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

The higher the grade, the stronger the bolt. English bolts have radial lines on their head to identify the grade, or strength class. The number of lines on the bolt head is 2 less than the actual grade. So, for example, a grade 5 bolt will only have 3 radial lines on its head.

Is Grade 5 bolt stronger than stainless steel?

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).

Will a Grade 5 bolt shear?

Shear strength of alloy steel is approximately 60% of its ultimate tensile strength. Reference to Table 1 shows that the yield strength of a Grade 8 bolt is higher than the ultimate strength of a Grade 5 bolt. The Grade 5 bolt will therefore always fail first whether in tension or shear.

Can you use a Grade 5 Nut with a Grade 8 bolt?

With Grade 5, A325 and metric 8.8 bolts, low strength nuts can be safely used unless the code prohibits them. With the stronger Grade 8, A490 and metric 10.9, high strength nuts have to be used and these bolts can strip the threads out of mild steel nuts.

What is the strongest metal bolt?

BUMAX® Ultra has proven itself as the world’s strongest bolt – in various highly-demanding critical fastener applications around the world where standard fasteners are simply inadequate.

How do I choose a bolt grade?

For safety, think about higher strength. In shear forces, think about a diameter that will easily take the loads. With tension forces, thick about fine threads and higher strength material. As a perspective, use diameter as much as bolt grade for strength.

What grade are engine bolts?

Grade 5

Most automotive hardware is Grade 5 rated and is identified by three radial lines on the head of the bolt. They are made from a medium carbon steel that is quenched and tempered.

Which steel grade is strongest?

Even among steel alloys, grade 304 stainless steel is noteworthy for its high tensile strength—roughly 621 MPa (90 ksi). Like most stainless steels, grade 304 has a high maximum operating temperature (about 870˚C).

Is Grade 5 harder than stainless?

The second most common stainless steel grade, this material is stronger than grade 2, slightly weaker than grade 5,or generally as strong as medium to low carbon steel.

What material is a Grade 5 bolt?

strength carbon steel

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.

Are zinc bolts Grade 5?

The material is magnetic. The zinc plating offers corrosion resistance and a reflective appearance.

What type of steel is a Grade 5 bolt?

medium carbon steel

As noted above, Grade 5 bolts are made of medium carbon steel that has been quenched and tempered. The normal range size is from a quarter of an inch (¼) up to one and a half inches (1 ½).