ONA can provide bolts and nuts of various specifications and models, and can also be customized according to your needs.
What do the commonly used 8.8 grade hexagonal bolts mean?
Bolt performance grade fastener products, according to GB/T3098.1 and GB/T3098.6 standards, require bolts, screws, nuts, studs, etc. with a thread diameter ≥5mm, and stainless steel studs with a thread diameter ≥6mm to be marked on the head or rod. The product mark should include: 1. The manufacturer's identification mark; 2. The performance grade mark.
Commonly used bolt performance grades are divided into more than 10 grades such as 3.6, 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9, and 12.9 (the new national standard has cancelled grade 3.6). Among them, bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched and tempered). They are generally called high-strength bolts, and the rest are generally called ordinary bolts.
The bolt performance grade number consists of two parts, which represent the nominal tensile strength value and yield strength ratio of the bolt material.
The meaning of bolt performance grade is an internationally accepted standard. Bolts of the same performance grade have the same performance regardless of their materials and origins. Only the performance grade can be selected in the design.
The so-called strength grade 8.8 and 10.9 refer to the shear stress grade of the bolts as 8.8GPa and 10.9GPa.
ONA can provide bolts and nuts of various specifications and models, and can also be customized according to your needs.
What do the commonly used 8.8 grade hexagonal bolts mean?
Bolt performance grade fastener products, according to GB/T3098.1 and GB/T3098.6 standards, require bolts, screws, nuts, studs, etc. with a thread diameter ≥5mm, and stainless steel studs with a thread diameter ≥6mm to be marked on the head or rod. The product mark should include: 1. The manufacturer's identification mark; 2. The performance grade mark.
Commonly used bolt performance grades are divided into more than 10 grades such as 3.6, 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9, and 12.9 (the new national standard has cancelled grade 3.6). Among them, bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched and tempered). They are generally called high-strength bolts, and the rest are generally called ordinary bolts.
The bolt performance grade number consists of two parts, which represent the nominal tensile strength value and yield strength ratio of the bolt material.
The meaning of bolt performance grade is an internationally accepted standard. Bolts of the same performance grade have the same performance regardless of their materials and origins. Only the performance grade can be selected in the design.
The so-called strength grade 8.8 and 10.9 refer to the shear stress grade of the bolts as 8.8GPa and 10.9GPa.
1. Materials: High manganese and customised materials.
2. Use: Wear parts for crushers in the quarry, mining, cement aggregate, recycling, shredding and demolition fields etc.
3. Certifications: ISO9001 and CE certification.
4. Production quality testing: Hardness testing, metallographic structure, machinery performance testing,ultrasonic inspection, high frequency infrared carbon and surface analysis etc.
5. Competitive products: Good quality with reasonable price.
6. Strong wear resistance and long life span, can be used in harsh environment and serious abrasion.
7. Professional: ONA has over 10 years working experience in casting and forging process and manufacture.
8. We can provide customized design according to our clients’ demands and also refine our products by our clients’ feedback.
FAQ
Q What kinds of products do you offer?
AWe provided parts are mainly related to your plant machine. It ranges from the drill rod, excavator buckets and wheel loaders, crusher spare parts, construction machinery parts, brass bush, conveyor and screen spare parts, beneficial equipment spare parts, grinding mill spare parts, machining spare parts and other customized spare parts.
Q What kind of materials are you familiar with?
A
We are familiar with carbon steel, alloy steel, standard wearing plate, high manganese steel, high chrome steel, martensitic steel, casting iron, bronze and ceramic insert material.
Q What’s the maximum single weight that can be casted? What is your processing capacity per day?
AThe single weight that can be casted at one time is 13 metric tons. The capacity is 80 tons per working day.
Q Can you use foundry machining castings?
AYes, the CNC machine can machine material hardness from HB200 to HRC62.The maximum machining length is 8m and maximum width is 4m.
Q What information do we need to provide to you in order to confirm our parts order?
AWe work with technical drawings for any non-standard products. If the order is for standard parts, you only have to provide us with the part number so we may define the parts of the order.
No. 9 South Dachengfang West Road, Oaks Intelligent Manufacturer Industrial Park, Dangtu District Enconomic Development Zone, Ma'anshan City, Anhui Province
