Grade 8.8 Flange Bolt
Based on the working pressure requirement, the appropriate strength grade for flange bolts is determined. If the working pressure happens to be less than 1Mpa, a suitable choice would be grade 4.8 bolts. However, if the working pressure falls within the range of 1 to 4.5Mpa, it is advisable to opt for high-strength bolts of grade 8.8.
Based in China, Jiangsu Jinrui Metal Products Co., Ltd. holds a prominent position as a top-notch manufacturer and supplier of a comprehensive range of flange bolts. We proudly offer flange bolts in diverse grades, catering to the unique requirements of our esteemed clients. Our extensive range includes flange bolts with grades of 4.6, 4.8, 5.8, 8.8, 10.9, 12.9, A2-70, A4-70, and more.
Flange bolts of grade 8.8 and above are meticulously crafted from low-carbon alloy steel or medium-carbon steel. To ensure optimum strength and durability, these high-strength flange bolts undergo a rigorous heat treatment process involving quenching and tempering. As a result, they exhibit remarkable resilience and are widely recognized for their superior performance in demanding applications. On the other hand, we also offer a range of ordinary flange bolts that fulfill the requirements of less demanding tasks.
At Jiangsu Jinrui Metal Products Co., Ltd., we are committed to maintaining the highest standards of quality and precision in our products. Our experienced team utilizes advanced manufacturing techniques and state-of-the-art machinery to produce flange bolts that conform to stringent industry standards. We adhere to strict quality control measures at every stage of production, ensuring that our flange bolts meet or exceed the expectations of our valued customers.
As a customer-focused company, we understand the significance of timely delivery and reliable service. With a robust supply chain management system in place, we ensure prompt and efficient delivery of our flange bolts to clients across the globe. Whether you require flange bolts for automotive, construction, or industrial applications, we possess the capability to meet your specific needs with utmost professionalism.
Partner with Jiangsu Jinrui Metal Products Co., Ltd. for high-quality flange bolts that offer unbeatable strength and reliability. Contact us today to discuss your requirements and benefit from our extensive product range and exceptional customer service.
At Jinrui, we offer a range of flange bolts to meet various performance requirements. While ordinary hex flange bolts suffice in most fields, we also provide options with different performance levels or grades. You are welcome to explore our selection and choose the bolts that best suit your needs.
Production Process of Hex Flange Bolts
Specification of Hex Flange Bolts
d | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M20 | ||
P | Thread Pitch | Coarse Thread | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 |
Fine Thread 1 | / | / | 1 | 1.25 | 1.5 | 1.5 | 1.5 | 1.5 | ||
Fine Thread 2 | / | / | / | 1 | 1.25 | / | / | / | ||
b | L≤125 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 46 | |
125＜L≤200 | / | / | 28 | 32 | 36 | 40 | 44 | 52 | ||
L＞200 | / | / | / | / | / | / | 57 | 65 | ||
c | MIN | 1 | 1.1 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | 3 | |
da | Max | 5.7 | 6.8 | 9.2 | 11.2 | 13.7 | 15.7 | 17.7 | 22.4 | |
dc | MAX | 11.8 | 14.2 | 18 | 22.3 | 26.6 | 30.5 | 35 | 43 | |
ds | MAX | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 20 | |
MIN | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | 19.67 | ||
du | MAX | 5.5 | 6.6 | 9 | 11 | 13.5 | 15.5 | 17.5 | 22 | |
dw | MIN | 9.8 | 12.2 | 15.8 | 19.6 | 23.8 | 27.6 | 31.9 | 39.9 | |
e | MIN | 8.71 | 10.95 | 14.26 | 16.5 | 17.62 | 19.86 | 23.15 | 29.87 | |
f | MAX | 1.4 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | |
k | MAX | 5.4 | 6.6 | 8.1 | 9.2 | 11.5 | 12.8 | 14.4 | 17.1 | |
k1 | MIN | 2 | 2.5 | 3.2 | 3.6 | 4.6 | 5.1 | 5.8 | 6.8 | |
r1 | MIN | 0.25 | 0.4 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.8 | |
r2 | MAX | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.9 | 1 | 1.2 | |
r3 | MIN | 0.1 | 0.1 | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 | 0.4 | |
r4 | ≈ | 3 | 3.4 | 4.3 | 4.3 | 6.4 | 6.4 | 6.4 | 8.5 | |
s | MAX=Nominal Size | 8 | 10 | 13 | 15 | 16 | 18 | 21 | 27 | |
MIN | 7.78 | 9.78 | 12.73 | 14.73 | 15.73 | 17.73 | 20.67 | 26.67 | ||
Common Grade and Coating
Standard | Material | Grade | Finish | Thread |
DIN933 | carbon steel | 4.6 | Plain | UNC |
Zinc plated | ||||
Alloy steel | Yellow zinc plated | |||
PTFE | ||||
Stainless steel | Black Oxide | UNF | ||
Dacromet | ||||
Other | HDG | |||
Other |
Application Area of Hex Flange Bolts
The flange bolt is composed of a hexagonal head and flange plate, its support area to stress area word ratio is larger than that of other bolts, so the flange bolt can withstand higher pre-tightening force and has better anti-loosening performance.
Therefore high-strength flange bolts above grade 8.8 are often used in key structures such as highways and railway bridges, industrial and civil buildings, towers, and hoisting machinery.
In some infrastructure fields such as machinery and equipment, petrochemicals, automobile manufacturing, and pressure pipelines, ordinary flange bolts with grade 4.8 are widely used.
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