About Grade 8.8 Bolts and Nuts

Grade 8.8 bolts are frequently used in heavy manufacturing, such as the production of tractors and trucks, and are designed for high-strength applications. The bolts are normally constructed from a medium carbon alloy steel that has been zinc-plated for further durability. The flat, hexagonal head of the grade 8.8 bolt, which is the highest rating on the bolt rating system, is characterized by six radial lines.

The hex bolts with the highest strength and hardness

Contrary to popular assumption, a grade 8.8 bolt is actually stronger than a stainless steel bolt. In fact, grade 8.8 bolts are the toughest and hardest hex bolts you would want to utilize in construction or the automotive industry, according to the Society of American Engineers (SAE). While the stainless steel bolts don’t carry an indicated proof load, the carbon alloy bolts do, with a proof load of over 120,000 psi. Additionally, the minimum strength of grade 8.8 bolts is around 130,000 psi, but the maximum strength of stainless steel is not greater than 90,000 psi.

How to recognize a grade 8.8 bolt

All you have to do is look at the marking on the bolt head if you need to replace a fastener on one of the machines and you think it might be a grade 8.8 bolt. A grade 8.8 bolt will have six lines stamped into the head that point in the direction of the center, in accordance with industry requirements. The number 10.9 is the lines’ metric equivalent.

There’s a chance you won’t be able to read the markings if the bolt is old and rusty. In this situation, looking in the equipment’s manual for the right kind of fasteners would be the best course of action. In the event that this is not an option, your best bet is to hazard an estimate based on the former bolt’s settings and the normal load it carried.

Available in a wide range of lengths

The ultra-strong fastener comes in a wide range of lengths depending on the specific usage, industry, and amount of stress and heavy weights it needs to support. Depending on the specifics of the application, the additional length may be acquired by lengthening the grip, the thread, or both. It is crucial to understand that the length of the fastener, or the distance between the bottom of the head and the end of the screw, is not the same as what is known as the “nominal length” in most businesses. The latter is made up of the grip and thread’s combined length.

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