China Suppliers Factory for Din 6915 Hexagon Nuts - High-Grade Steel Structure Fasteners for Engineering Projects
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 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.