Knurled head Alloy Steel Hexagon Socket Head Cap Screws

Material: Carbon 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.

Grade 12.9 Alloy Steel Socket Head Screws are one of the most commonly used series of high-strength bolts: Grade 12.9 Socket Head Screws are generally used in occasions where high mechanical properties are required. Such as injection molding machinery, hydraulic equipment, mold assembly, etc. 12.9-grade Alloy Steel Socket Head Screws after heat treatment, surface hardness can reach 39-44 degrees.12.9 grade Alloy Steel Socket Head Screws production standards are referred to as the German standard DIN912, the national standard GB / T70.1, the American standard, and the British standard to produce. American 12.9-grade hexagon socket head cap screws supply range from #4 - 1-1/2, British 12.9-grade hexagon socket head cap screws supply range from 1/4 - 1-1/2, and other standard specifications.

Alloy Steel Socket Head Screws Features

The features of Alloy Steel Socket Head Screws mainly include easy assembly, space-saving, cost-saving for customers, and customized production. 

Alloy Steel Socket Head Screws, this kind of screws has some remarkable features due to its unique design.

Easy to assemble: customers can use them directly without additional installation steps, simplifying the installation process. 

Space-saving: It can be used in small spaces and adapts to various installation environments. 

Cost saving for customers: optimized design and material selection help customers gain an advantage in cost control. 

Customized production: Tailor-made products can be provided according to the customer's unique requirements to meet various specific application needs. 

In addition, Alloy Steel Socket Head Screws also have the function of anti-loosening, through a unique technology, the special thread adhesive is evenly coated on the threads, to achieve a permanent and robust anti-loosening effect, and solve the problem of loosening. This design not only improves the service life of the screws but also increases the efficiency of the screws. This design not only improves the service life of the bolt but also enhances its safety and reliability.