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China Suppliers Factory DIN 6915 Steel Structure Hexagon Nut for Engineering Projects and Heavy-Duty Applications
Production parameter
| thread specification d | M16 | M20 | (M22) | M24 | |
| P | pitch | 2 | 2.5 | 2.5 | 3 |
| da | Max | 17.3 | 21.6 | 23.8 | 25.9 |
| Min | 16 | 20 | 22 | 24 | |
| dw | Min | 24.9 | 31.4 | 33.3 | 38 |
| e | Min | 29.56 | 37.29 | 39.55 | 45.2 |
| m | Max | 17.1 | 20.7 | 23.6 | 24.2 |
| Min | 16.4 | 19.4 | 22.3 | 22.9 | |
| mw | Min | 13.1 | 15.5 | 17.8 | 18.3 |
| m1 | Min | 11.5 | 13.6 | 15.6 | 16 |
| c | Max | 0.8 | 0.8 | 0.8 | 0.8 |
| Min | 0.4 | 0.4 | 0.4 | 0.4 | |
| s | Max | 27 | 34 | 36 | 41 |
| Min | 26.16 | 33 | 35 | 40 | |
| Thousand piece weight (steel)≈kg | 61.51 | 118.77 | 146.59 | 202.67 | |
Production description
The main application of steel structure bolt nut is in steel structure engineering project to connect the nodes of steel plate thick steel structure. Better fastening characteristics, used for steel structure and engineering projects, a fastening effect. In the general steel structure, the required steel structure bolts are above 8.8 grade, there are also 10.9,12.9. All of are high-toughness steel structure bolts. Sometimes the bolts on the steel structure do not use the electroplating process, but use the primary color can be.
Steel structure bolts are divided into torsion-shear high strength bolts and large hexagonal head high strength bolts. Large hexagonal high strength bolt belongs to the high toughness level of general screws, torsional shear high strength bolt is an improved version of large hexagonal high strength bolt, in order to better engineering construction.
Points to note
①
surface rust, oil, burr in bolt hole wall, welding tumor should be cleaned up.
②
the required anti-scratch coefficient must be achieved after the treatment of contact friction surface.
③
no oil, soil and other sundries are allowed when the friction surface of the treated component is installed.
④
the friction surface of the assembly should be kept dry during installation and should not be used in rain.
⑤
strictly check and correct the deformation of the connected steel plate before installation.
⑥
do not hammer into the bolt to prevent damage to the screw thread.
⑦
the electric wrench, which is checked regularly in use, ensures the accuracy of the torque and operates in the correct tightening order.
The main safety technical measures
■
the size of the spanner using the movable wrench should be in accordance with the size of the nut, should not be used on the small wrench casing. High-altitude operations should be used.
Frequently Asked Questions
What is the primary application of steel structure bolt nuts?
They are mainly used in steel structure engineering projects to connect the nodes of thick steel plate structures, providing superior fastening characteristics.
What grades are high-strength steel structure bolts typically available in?
In general steel structures, the required steel structure bolts are above grade 8.8. They are also widely available in grades 10.9 and 12.9, all of which are high-toughness steel structure bolts.
What are the main types of high-strength steel structure bolts?
Steel structure bolts are divided into torsion-shear high strength bolts and large hexagonal head high strength bolts. The torsion-shear type is an improved version designed for better engineering construction.
What preparations must be made to the contact surface before installation?
Surface rust, oil, burrs in the bolt hole wall, and welding tumors should be completely cleaned up. Additionally, the required anti-scratch coefficient must be achieved after treating the contact friction surface.
Can steel structure bolts be installed during rainy conditions?
No, the friction surface of the assembly must be kept completely dry during installation and should never be installed in the rain.
What safety measures should be followed regarding wrench usage?
The size of the spanner using the movable wrench should be in accordance with the size of the nut, and it should not be used on a small wrench casing. High-altitude operations should be used.