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High Strength Bolts
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- 产品描述
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Product Introduction
High-strength bolts are mechanical fasteners with a performance grade of ≥ 8.8. They are widely used in fields such as heavy machinery, bridges, steel structures, wind power, and automobiles, where high connection strength and reliability are required.
Core Feature
High intensity
It is manufactured using medium-carbon alloy steel or low-carbon alloy steel (such as 40Cr, 35CrMo), and undergoes quenching + tempering treatment for quenching and tempering. Its tensile strength and yield strength are much higher than those of ordinary bolts.
Common strength grades: 8.8 grade, 10.9 grade, 12.9 grade. The larger the number, the higher the strength.
Tightening force control
During installation, strict pre-tightening force must be applied. This can be achieved through torque control, angle measurement method or stretching method to ensure the rigidity and anti-slip ability of the connection.
It is commonly used in friction-type connections, where the load is transmitted through the friction force between the contact surfaces, rather than the shear force of the bolt shaft.Surface treatment
Common treatment methods: blackening, hot-dip galvanizing, dactron coating, Teflon coating, etc., to enhance anti-corrosion and anti-biting performance.
The Teflon/PTFE coating is commonly used in harsh environments such as those in the chemical and marine industries. It can effectively prevent the bolts from rusting and seizing.
Compliance requirements
It must be used in conjunction with nuts and washers of the same grade to ensure the overall connection performance.
Installation requires the use of a dedicated torque wrench or hydraulic stretcher. Ordinary wrenches must not be used to tighten the screws at will.
Exhibition
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FAQ
Are you a trading company or a manufacturer?
We are a large, leading company in the industry with decades of experience in the manufacture and development of fasteners and a recognized reputation.
What can you buy from us?
Our company mainly produces bolts GB5782 GB5783、DIN933/931、Quenching black,electroplating zincHot dip galvanized anti-corrosion,Dacromet anti-corrosion,nut GBG170DIN934、Customized special-shaped bolts and nuts.
How can we guarantee quality?
Always provide pre-production samples before mass production; always conduct a final inspection before shipment.
Do you support customized services?
Yes, we support custom CNC non-standard irregular parts.
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