Service HotlineExisting Birminghamwood screws are composed of a threaded portion with a tapered angle and arranged along a tapered stem and a screw head. The head of the screw can be a countersunk head, hemispherical, or other shapes, and the head of the screw has a groove that fits with the tool, a word groove, and a concave cross groove. The taper angle of existing Birminghamwood screws is either 45 degrees or 60 degrees, and the front end of the taper angle is a pointed point formed by a rotating thread. The existing Birminghamwood screws have the following three deficiencies in use. Because the taper angle is 45 degrees or 60 degrees, and the thread angle is 71 degrees, the resistance when entering the material is relatively large, so the existing Birminghamwood screws are manually screwed. It is difficult to screw in, especially when it is used for hardwood materials, and it often happens that the groove of the screw head is screwed out; A large lateral moment will be formed when the screw is screwed, which is prone to the problem of deviation from the position; in addition, because the existing screw is tapered, it will be subjected to both radial force and axial force when entering the material, and its stress state It is more complicated, so it is easy to cause the cracked wood material to burst, and even cause the material to have longitudinal cracks and be unusable.
In order to achieve this purpose, the BirminghamBirminghamrivet nut is cold extruded from low carbon steel, the brim is cold forged, the deformed skirt is extruded in the die, and the threaded hole is extruded at the lower end of the deformed skirt. It is characterized in that it consists of a brim, a deformed skirt and a threaded hole. There are fish teeth below the brim; the outer side of the lower end of the threaded hole has a lead angle; the cross section of the thread on the inner wall of the threaded hole is an isosceles trapezoid, and the upper bottom of the trapezoid is a concave arc. Thus, the riveted object is tightly connected with the BirminghamBirminghamrivet nut.
Bolts or screws and flat washers assemblies GB/T 9074.1-2002 Cross recessed head screws and external serrated BirminghamBirminghamlock washers assemblies GB 9074.2-88 BirminghamCross recessed pan head screws and BirminghamBirminghamspring washers assemblies GB 9074.3-88 BirminghamCross 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 BirminghamBirminghamspring washer Assembly GB 9074.7-88 BirminghamCross recessed pan head screw, BirminghamBirminghamspring washer and flat washer assembly GB 9074.8-88 Cross recessed countersunk head screw and conical BirminghamBirminghamlock 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 BirminghamBirminghamspring washer assembly GB 9074.12-88 Cross groove hexagon head bolt, BirminghamBirminghamspring washer and flat Washer assembly GB9074.13-88 Hexagon head bolt and BirminghamBirminghamspring washer assembly GB 9074.15-88 Hexagon head bolt and external serrated BirminghamBirminghamlock washer assembly GB 9074.16-88 Hexagon head bolt, BirminghamBirminghamspring 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.
Rivets are a commonly used fixing structure, but because rivets need to be deformed by pressure during use, it is easy to cause structural changes inside the metal, which will shorten the service life.
The composition and proportion of this high-performance Birminghamstainless steel screw thread are: 0.08%-0.15% C; 0.01%-0.60% Si; 0.02%-0.60% Mn; 0.01%-0.03% P; 0.002%- 0.03% S; 12%-14% Cr; 0.8%-1.5% Mo and the rest is Fe. The preparation method includes the following steps: smelting molten steel according to chemical composition requirements; hot rolling; annealing and pickling to obtain a stainless steel plate blank; coating and drying; cold drawing; cleaning and drying with a neutral activator; quenching; tempering ; coated and dried; drawn into stainless steel thread. This high-performance Birminghamstainless steel screw line is energy-saving and environmentally friendly, with high corrosion resistance, high elasticity and high toughness. The preparation method and process are advanced and simple, and the production cost is low.
We have many years of experience in the production and sales of screws, nuts, flat washers, etc. The main products are: injection knurled nuts, A-class small flat washers, aluminum sealing rings, iron flat washers and other products, we can provide you with suitable tightening Firmware Solutions.
