Carbon steel High Strength ASTM A325 Zinc Surface Hex Head Bolts

Carbon steel High Strength ASTM A325 Zinc Surface Hex Head Bolts

Description

Hexagonal bolts, also known as hexagonal head screws, hexagon head bolts, hexagon head screws, hexagon screws or mechanical bolts, are a common choice in construction and maintenance.Hexagon head bolts, commonly known as hexagon head cap screws, are bolts with hexagonal or six-sided heads.Hexagon bolts have six heads, which is the industry standard for forged head bolts.A common feature of hexagonal head screws is the surface of the gasket directly below the head to produce a better seal.A hexagon head screw bolt is actually produced within a tighter tolerance range and can be used anywhere with a hexagon head bolt.

everal concepts about high strength bolts. According to the specification, the bolt performance grade is above 8.8, which is called high strength bolt. The current national standard is only listed in m39. Suitable for la.RGE size specification. Especially, the length of high-strength bolts is more than 10 ~ 15 times, the domestic production is still very short.

Difference between high strength bolts and ordinary bolts:

High strength bolts are larger than common bolts of the same specification.

The material of ordinary bolts is made of Q 235 A 3).

High-strength bolt material 3 steel or other high-quality materials, made after heat treatment, improve the strength.

The difference between the two is the difference in the strength of the material.

From the perspective of raw materials:

High strength bolt is made of high strength material. Screw of high strength bolt. Nuts and gaskets are made of high strength steel. 35 CrMoA and other common bolts made of Q235 steel.

From the strength grade point of view: the use of high-strength bolts is becoming more and more extensive. Commonly used 8.8s and 10.9s two grade strength grade, of which 10.9 grade is the majority. Bolt strength grade 10.9. E should be low, generally 4.4. 4.8 grade, grade 5.6 and 8.8.

From the point of view of stress characteristics: high strength bolts apply pretension force and transfer external force through friction. The shear force must be transferred when the nut is tightened when the common bolt is shearing to the hole wall pretension connection. The pretensile force is very small. In addition to the high strength of the material, the high strength bolt will also produce a large pretightening force, resulting in extrusion force between the connectors. The friction force is perpendicular to the screw. The bearing capacity of the high strength bolt is direct.

According to stress characteristics. The bearing type and friction type are divided. The two calculation methods are different. The Ed should be used in the design of the minimum specification M12 for common high strength bolts. Unstable performance of M 16 / M 30 and super size bolts.

Specification:

Application:

riction type high strength bolt: suitable for steel frame structure beam, column connection, solid net beam connection, industrial workshop heavy crane beam connection. Brake system and important structures under dynamic load. High strength bolts: shear connections on the structure, allowing a small amount of sliding or bearing indirect dynamic loads. Tensile high strength bolts: when bolts are pulled out. The fatigue strength is very low. Under dynamic load, its bearing capacity is not more than 0.6 Pu P, which is the allowable axial force of bolt. Therefore, it is only suitable for static load, such as flange butt joint T joint, etc

Advantage:

,

1. Good after sales service. Any small problem happening will be solved at the most prompt time;

2. Many years of export experience;

3. Specifications list is available upon your request

4. Welcome to send enquiry, we will reply soon.

5. Prompt shipment with professional documents

6. Custom packing, with photo before shipment

7. High quality and competitive price.

More pictures: