| Material | 8.8 s,
45#,40Cr
10.9 s
20MnTiB,35VB |
| Specification | M12-M36 |
| Application | A variety of large-span steel bridges, large steel housing,
power station boiler steel structure, high-rise buildings,
stadiums, steel tower mast, port container cranes and other large-scale friction-type connection |
standard: GB/T1228~1231
High strength bolts
From raw material to see:
High strength bolts made of high-strength materials. Screw high-strength bolts, nuts and washers consists of high-strength steel production, steel commonly used 45, 40 boron steel, 20 manganese titanium boron steel, 35CrMoA like. Ordinary bolt used Q235 (equivalent to past A3) steel.
Judging from the intensity level:
High-strength bolts, the increasingly widespread use. Common 8.8s and 10.9s two intensity levels, the majority of which 10.9. Ordinary bolt strength grade is lower, typically 4.4, 4.8, 5.6 and 8.8.
From the mechanical characteristics of view:
High strength bolt by applying a pre-tension and friction transfer force. Ordinary bolted by bolt rod shear and pressure to pass the hole wall shear, a small pre-tension generated when tightening the nut, the impact is negligible, and high-strength bolts in addition to its material strength is high, put a lot of back bolt Pretentioned that generate compressive force between the connecting member so that the direction perpendicular to the screw has a great friction, and pre-tension, anti-slip coefficient and the types of steel have a direct bearing capacity of high-strength bolts.
According to the mechanical characteristics of sub-type pressure and friction type. Difference between the two calculation methods. High-strength bolts minimum specifications M12, used M16 ~ M30,
Shenzhou hongtong machinery accessories Ltd is a integrated company with multiple areas of products. Our company primarily specialized in developing and producing a variety of general machinery parts, manufacturing plastic injection molding parts, hardware stamping parts, metal castings selling magnesium alloy, aluminum alloy bicycle frame.
Our key business is a broad variety of machine accessories with more than 100 categories, for now we have tens of thousands molds in warehouse. Besides, we also can supply the service of develop new products, as we have number of mold masters, and we have reliable partner, which can supply high quality products as well. We have been making great efforts to keep developing new products and project to optimize our product lines and capacities. As a result, we have expanded rapidly and made great
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