We have our own surface treatment plant, and the thickness of zinc layer meets the standard requirements. We can make authoritative inspection reports, including surface treatment such as hot galvanizing, Dacromet, electro galvanizing, boiling black, etc.GB series, Q standard series, DIN German standard series, IFI American standard series, BS British standard series, JIS Japanese standard series, ISO international standard series, etc.The material comes from a high-quality steel manufacturer, which can issue an authoritative material inspection report, including Q235, 35 #, 45 #, 345B, 40Cr, 35CrmoA, stainless steel 201, 304 and other special materials.Poland, Russia, Algeria, Egypt, Ghana, Kuwait, the United Arab Emirates, Kazakhstan, Malaysia, Pakistan, the Philippines, South Korea, Myanmar, Thailand, Ukraine, Syria, India, the United States, Turkey, Brazil, Sri Lanka, Norway, etc.One of the standards for hexagon bolts is the level standard, which is divided into 4.8 and 8.8. These two levels are used more frequently in the market. Especially Grade 4.8 outer hexagon bolt. Because it is much cheaper than grade 8.8 hex bolts. Of course, it is more widely used. But for products with high requirements. Because of its high requirements in hardness and other aspects.The outer hexagon screw is a matching nut used to fasten and connect two connected parts with through holes and components. Hex head screws are commonly used bolts. It is more important to use Class A and Class B outer hexagon. In addition, it is often used in the occasion of high assembly accuracy, large impact, vibration or cross rate load. Grade C outer 66 screws are used in situations where the surface is rough and the assembly accuracy is not required.This requires the use of grade 8.8 hex bolts. Grade 8.8 outer hexagon bolt is harder in terms of hardness and screw torque. It is safer to use the product. Faster and more stable.1. How can I get a quotation? A: Leave us a message with your purchase requests and we will reply you within one hour on working time. And you may contact us directly by Trade Manager or any other instant chat tools in your convenient. 2. Can I get a sample to check the quality? A: We are glad to offer you samples for test. Leave us a message of the item you want and your address. We will offer you sample packing information, and select the best way to deliver it. 3. When can I get the quotation? A: We usually quote you within 24 hours after we get your inquiry. If you are very urgent to get the quotation, please call us or tell us in your mail, so that we could regard your inquiry priority.