Grade 8 Bolts

(Information and Online Shopping)

Hex Head Cap Screws Grade 8 Yellow Zinc

 Hex Head Cap Screws Grade 8 Fine Yellow Zinc

Plow Bolts Grade 8 with Plain Finish 

Hex Head Cap Screws Grade 8 Coarse

Hex Head Cap Screws Grade 8 Fine 

Plow Bolts Grade 8 Plain Finish 

 1025 Piece Grade 8 Nut and Bolts Assortment

 1024 Piece Fine Thread Grade 8 Nut and Bolt Assortment

2625 Piece Grade 8 Nut and Bolts Assortment with 40 Hole Bin 

1025 Piece Grade 8 Nut and Bolt Assortment - Coarse Thread

1025 Piece Grade 8 Nut and Bolt Assortment Fine Thread

2625 Piece Grade 8 Nut and Bolt Assortment with 40 Hole Bin

3100 Piece Grade 8 Nut and Bolt Assotrment

3100 Piece Grade 8 Nut and Bolt Assortment with two 40 Hole Bins

Grade 8 Bolts: Quick Facts
A grade 8 bolt is stronger than the more commonly used grade 5. It is made of alloy steel and has six radial lines on the top of the bolt head. Grade 8 bolts have a tensile strength of 150,000 pounds per square inch. We recommend using grade 8 nuts, flat washers and high alloy lock washers with any grade 8 bolts / hex cap screws.

Grade Radial Bolt Markings Material Nominal Size Diameter/Inches Proof Load
psi
Tensile Strength
minimum psi
Yield Strength
minimum psi
Grade 8

6 Radial Lines
Grade 8 Bolt - 5 Radial Lines Medium Carbon Alloy Steel 1/4" thru 1 1/2" 120,000 150,000 130,000

Grade 8 Bolts: Strength and Durability
The factor that makes a grade 8 bolt different from a lower grade bolt is its preload strength. Higher grade materials, such as carbon alloy steel, allow for greater torque strength in the threads of the bolt. The preload, or thread tension in a fastener is higher when the type of steel being used is grade 8 in quality.

Where are Grade 8 Bolts Used?
Common uses for grade 8 bolts are for military, aerospace, or marine related mechanical applications where high stress and strong load bearing pressures are a major factor. The off road vehicle market also has a need for grade 8 bolts for the same reasons. One thing to keep in mind is that it's almost always a safe bet to go with the highest grade of bolt you can when in doubt. Manufacturers may recommend a grade 5 but it never hurts to go with higher quality materials. The worst that can happen is that you paid a little more for the peace of mind.
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