Service HotlineThe front wall sound insulation pad is used to absorb the heat and noise transmitted by the firewall, and also plays the role of heat insulation and vibration isolation, ensuring a relatively quiet and comfortable environment in the car and improving ride comfort. As shown in FIGS. 1 and 2 , the front wall sound insulation and heat insulation pad 101 is generally fixed to the vehicle body by means of screw buckles 102 . The screws 100 are clamped by the clamping feet 103 in the screw The limiting rib 104 clamps the screw 100. After the screw 100 is clamped into the screw buckle 102, the tail end of the screw 100 is exposed, which is easy to scratch the operator when assembling other components, and the exposed screw 100 is easy to cause corrosion, thereby affecting the connection strength of the screw 100, and also The service life of the screw 105 is reduced.
Traditionally, the pressure rivets on the product are all beaten by hand by workers, resulting in high scrap rate and low efficiency, and this rivet is not a traditional rivet, so it is difficult to locate and requires high pressure. The rivets are thin, and the pressure is too large to cause deformation of the rivets. If the pressure is too small, it cannot be riveted. Without special positioning and tooling, it cannot be riveted on the riveting machine. The quality of the products produced in this way is difficult to guarantee, and the quality levels of the products in the same batch are uneven. Affect delivery time.
Bolts or screws and flat washers assemblies GB/T 9074.1-2002 Cross recessed head screws and external serrated lock washers assemblies GB 9074.2-88 Cross recessed pan head screws and spring washers assemblies GB 9074.3-88 Cross recessed pan head screws, springs Washer and flat washer assembly GB 9074.4-88 Cross recessed small pan head screw and flat washer assembly GB 9074.5-88 Cross recessed small pan head screw and large washer assembly GB 9074.6-88 [1] Cross recessed small pan head screw and spring washer Assembly GB 9074.7-88 Cross recessed pan head screw, spring washer and flat washer assembly GB 9074.8-88 Cross recessed countersunk head screw and conical lock washer assembly GB 9074.9-88 Cross recessed countersunk head screw and conical lock Tight washer assembly GB 9074.10-88 Cross groove hexagon head bolt and flat washer assembly GB 9074.11-88 Cross groove hexagon head bolt and spring washer assembly GB 9074.12-88 Cross groove hexagon head bolt, spring washer and flat Washer assembly GB9074.13-88 Hexagon head bolt and spring washer assembly GB 9074.15-88 Hexagon head bolt and external serrated lock washer assembly GB 9074.16-88 Hexagon head bolt, spring washer and flat washer assembly GB 9074.17-88 From Tapping screw and flat washer assembly GB /T 9074.18-2002 Cross recessed hexagon head self-tapping screw and flat washer assembly GB 9074.20-88 Cross recessed hexagonal head self-tapping screw and large washer assembly GB 9074.21-88 For assembly Spring Washers GB 9074.26-88 External Serrated Lock Washers for Assemblies GB 9074.27-88 Conical Lock Washers for Assemblies GB 9074.28-88.
According to the development and evolution process of self-tapping screws, we believe that the main types of self-tapping screws are as follows: 1. Common self-tapping screw threads are self-tapping threads, also known as wide thread. The surface is mostly electroplated. 2. Self-cutting and self-tapping screws are called scraping ends of self-tapping screws in my country's standard. The threads are self-tapping threads or machine threads, and the cross grooves are also H type. There are several types of self-cutting self-tapping screws: cross recessed pan head self-cutting self-tapping screws, cross recessed countersunk head self-cutting self-tapping screws. Cross recessed countersunk head self-cutting self-tapping screws, hexagon head self-cutting self-tapping screws. 3. Self-extrusion and self-tapping screws (self-tapping locking screws) The threads of self-extrusion and self-tapping screws are generally machine threads, and self-tapping threads are rarely used. In the wrenching method, in order to ensure the use of high-speed automatic assembly wrenches, slotting is generally not recommended. The cross section of the screw of the self-extrusion self-tapping screw is triangular. So it is also called triangular thread screw. 4. Self-drilling and self-tapping screws (self-drilling screws) The threads of self-drilling and self-tapping screws are self-tapping threads according to Chinese, German and international standards. In the American ASME and SAE standards, the BSD self-drilling self-tapping screws are self-tapping threads, and the CSD self-drilling self-tapping screws are machine threads. Self-drilling self-tapping screws are not recommended for slotted and normal hex head. 5. Metal driving screws (metal tapping screws) The metal driving screws have multiple threads and special threads with a certain helix angle. Only the American standard has metal drive screws, and there are no Chinese and German standards. 6. Wallboard self-tapping screws (dry wall screws) Wallboard white tapping screws are special threads with horn head, cross groove (H type) and 60° profile angle, and the surface is mostly phosphate treatment (phosphating). 7. The cross groove of the fiberboard nail is Z-shaped, and the surface treatment is mostly electroplating. There are several types of fiberboard nails: countersunk head, double countersunk head fiberboard nails, pan head, pan head flange (with pad) fiberboard nails, semi-countersunk head, semi-countersunk head flange (with cushion) fiberboard nails. 8. Combination self-tapping screws Ordinary self-tapping screws, self-cutting self-tapping screws, self-drilling self-tapping screws, etc., and flat washers, elastic washers (including spring washers, elastic locking washers, etc.). 9. Others Self-tapping screw types High and low thread double lead self-tapping screws, coarse and fine thread (different pitch) thread self-tapping screws, threads coated with sealing material (fall resistance) self-tapping screws, various composite groove self-tapping screws, Other special self-tapping screws, etc. In short, there are many types of self-tapping screws. With the development of production, the advancement of technology, new materials, new structures, and new thread forms, new self-tapping screw products will continue to appear.
screw can be equipped with only one spring washer or only one flat washer, or it can also only be equipped with a two-piece combination of flower teeth. The national standard number of the combination screw is represented by GB9074. The commonly used cross recessed small pan head three combination screw national standard is GB9074.8.
We have many years of experience in the production and sales of screws, nuts, flat washers, etc. The main products are: double lug washers, cross countersunk head machine screws, pull cap flat head column small countersunk head large countersunk head pattern rivet nuts, ingot screws and other products, we We can provide you with the right fastener solution for you.
