High-Temperature Alloy Steel Socket Head Screws—Grade B7

Material: Carbon steel, Alloy steel

Standard: GB /T 70.1 - 2008&Q 218B&ISO 4762 - 2004 &DIN 7984 - 2022&DIN 6912 - 2021&DIN EN ISO 12474 -&ANSI/ASME B 18.3&ISO 12474

1. Alloy Steel Socket Head Screws: With a tensile strength of 170,000 psi, these alloy steel screws are more robust than Grade 8 steel screws. Length is measured from under the head.

Black-oxide steel screws are mildly corrosion-resistant in dry environments. Zinc-plated steel screws resist corrosion in wet environments. The screws with a blue-dyed finish are easy to distinguish. Zinc-flake-coated steel screws are 20 times as corrosion-resistant as zinc-plated screws and comparable to Dacromet-coated screws.

Coarse threads are the industry standard; choose these screws if you don't know the pitch or threads per inch. Fine and extra-fine threads are closely spaced to prevent loosening from vibration; the finer the thread, the better the resistance. They are not compatible with coarse threads.

Screws that meet ASTM A574, ASTM A574M, and ISO 898-1 comply with specifications and testing requirements for material quality. Screws that meet ASME B18.3, ASME B18.3.1M, ISO 21269, and ISO 4762 (formerly DIN 912) comply with specifications.

2. Mil. Spec. Alloy Steel Socket Head Screws: Choose these screws for their adherence to strict military standards for material and construction. With a tensile strength of 160,000 psi, these alloy steel screws are more potent than Grade 8 steel screws. They're cadmium-plated to resist corrosion in wet environments. Length is measured from under the head.

Coarse threads are the industry standard; choose these screws if you don't know the threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.

3. Left-Hand Threaded Alloy Steel Socket Head Screws: Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. With a tensile strength of 170,000 psi, these alloy steel screws are more robust than Grade 8 steel screws. Their black-oxide finish provides mild corrosion resistance in dry environments. Length is measured from under the head.

Coarse threads are the industry standard; choose these screws if ydon'tn’t know the pitch or threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.

Screws that meet ASTM A574 comply with specifications and testing requirements for material quality. Screws that meet ISO 4762 (formerly DIN 912) comply with specifications for dimensional standards.

4. High-Temperature Alloy Steel Socket Head Screws—Grade B7:These screws are specially tempered to meet ASTM A193 specifications for temperatures up to 1100° F. They can be used in high-pressure applications. Length is measured from under the head.

Coarse threads are the industry standard; choose these screws if you don't know the threads per inch. Fine threads are closely spaced to prevent loosening from vibration. They are not compatible with coarse threads.

Alloy Steel Socket Head Screws have a grade strength of 12.9 and are made of carbon steel, which is iron—also called 12.9-grade hexagon socket head cap screws, also called 12.9-grade cylindrical head hexagon socket head cap screws, also called 12.9-grade cup head cap screws.

High-Temperature Alloy Steel Socket Head Screws-Grade B7, also known as cylindrical head socket head cap screws, High-Temperature Alloy Steel Socket Head Screws-Grade B7 are widely used in many industries. Grade B7 has a wide range of applications in many industries, which is inseparable from some of the characteristics of the screws; the following, we will learn about the attributes of High-Temperature Alloy Steel Socket Head Screws-Grade B7.

For High-Temperature Alloy Steel Socket Head Screws-Grade B7 is often used is Q235 wire. Of course, there is also the use of iron screws wire, for these screws wire can be decided High-Temperature Alloy Steel Socket Head Screws-Grade B7. Steel Socket Head Screws-Grade B7 has some characteristics.

The use of stainless steel screw hardness is relatively high, but if the iron screw hardness is much worse, this, with the iron itself, is part of the relationship between the wire. The texture of iron itself belongs to a softer category, with stainless steel wire simply no way to compare.

This begs the question, why just hexagonal, not quadrangular, pentagonal, or other shapes? A hexagonal screw can be graphically restored by turning it 60°. If the space is relatively small, as long as the wrench can be screwed, 60 ° can be installed on the screw, which is in the screwing angle and the length of the side of the mutual compromise after the product. If it is a square, the side length is long enough, but you have to screw 90 ° to restore graphically, which is not suitable for small space installation; if it is octagonal or decagonal, the angle of graphic reduction is slight, but the side length of the force is also small, easy to grind round.

Mil. Spec. Alloy Steel Socket Head Screws are screws with a hexagonal hole, characterized by the shape of a screw head that is a concave conical shape with a flat base and a hexagonal hole at the top that can be tightened with a hexagonal wrench. Mil. Spec. Alloy Steel Socket Head Screws are screws with the same head diameter but without a hexagonal hole and require a screwdriver or wrench to tighten.

Difference in the use of occasions

1. Mil. Spec. Alloy Steel Socket Head Screws are commonly used in the disassembly and assembly process of various machines and equipment, such as automobiles, motorcycles, bicycles, mechanical types of equipment, and so on;

2. Cylindrical head screws are more often used in furniture, wood products, and plate connection.

Special function difference

Mil. Spec. Alloy Steel Socket Head Screws have more special functions than Cylindrical Head Screws:

1. Mil. Spec. Alloy Steel Socket Head Screws have hexagonal holes for better protection of the screw head and more efficient torque transmission;

2. because Mil. Spec. Alloy Steel Socket Head Screws can be tightened with a hexagonal wrench, they are easier to handle during use, and they are also more popular due to their aesthetic appearance and ease of disassembly;

3. Mil. Spec. Alloy Steel Socket Head Screws can only withstand less torque due to their smaller flat diameter.

To summarize, Mil. Spec. Alloy Steel Socket Head Screws and Cylindrical Head Screws differ in use occasions and special functions and need to be selected according to the use needs. When purchasing, attention should be paid to differentiate between the different types to avoid the problem of improper use or tightening not tight.