High-Strength 316 Stainless Steel Socket Head Screws

Material: Stainless steel SUS304, SUS316

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

18-8 Stainless Steel Socket Head Screws： Made from 18-8 stainless steel, these screws have good chemical resistance and may be mildly magnetic. Length is measured from under the head.

Black-oxide stainless steel screws have a matte-black finish. Silver-plated stainless steel screws have mild lubricity, so they thread smoothly. Chrome-plated stainless steel screws have a decorative, mirror-like finish.

Metric screws are also known as A2 stainless steel screws.

Coarse threads are the industry standard; choose these screws if you don’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 ASME B1.1, ASME B18.3, ISO 21269, and ISO 4762 (formerly DIN 912) comply with standards for dimensions. Screws that meet ASTM B456 and ASTM F837 comply with standards for materials.

Mil. Spec. 18-8 Stainless Steel Socket Head Screws： Choose these screws for their adherence to strict military standards for material and construction. Dimensions meet Fed. Spec. FF-S-86 specifications. Screws may be mildly magnetic. 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.

Cleaned and Bagged 18-8 Stainless Steel Socket Head Screws for High Vacuum： Cleaned and double bagged in an ISO Class 5 (Fed. Std. Class 100) clean room, these screws are ready to use on chambers and components in high-vacuum systems. 18-8 stainless steel releases gas slower than other metals, allowing your system to achieve higher vacuum levels. Screws are silver-plated for lubricity, reducing wear over time. Length is measured from under the head.

Left-Hand Threaded 18-8 Stainless Steel Socket Head Screws： Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. Made from 18-8 stainless steel, they have good chemical resistance and may be mildly magnetic. 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.

Super-Corrosion-Resistant 316 Stainless Steel Socket Head Screws： More corrosion resistant than 18-8 stainless steel screws, these screws have excellent resistance to chemicals and salt water. They may be mildly magnetic. Length is measured from under the head.

Coarse threads are the industry standard; choose these screws if you don’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 ISO 4762 (formerly DIN 912) comply with specifications for dimensional standards.

High-Strength A286 Stainless Steel Socket Head Screws： Often used to fasten parts in engines and turbines, these are our most robust stainless steel screws. They are comparable in strength to alloy steel with 18-8 stainless steel corrosion resistance. Screws are nonmagnetic. Length is measured from under the head.

Coarse threads are the industry standard; choose these screws if you don’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 Fed. Spec. FF-S-86 and ISO 4762 (formerly DIN 912) comply with specifications for dimensional standards.

High-Strength 316 Stainless Steel Socket Head Screws： These screws are corrosion resistant in wet environments, nonmagnetic, and electrically conductive. Length is measured from under the head.

Coarse threads are the industry standard; choose these screws if you don’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 ISO 4762 (formerly DIN 912) comply with specifications for dimensional standards.

The main features of stainless steel cup-head socket head bolts include their material, classification, application range, and production process. 

Material: Stainless steel cup head hexagon bolts are mainly made of stainless steel; common materials include SUS202, SUS304, and SUS316. These stainless steel materials have good corrosion resistance and mechanical properties and are suitable for harsh environments. 

Classification: The head of stainless steel hexagonal bolts is designed in the shape of a cup head, which is not only aesthetically pleasing but also provides a larger contact area and enhances the stability of the connection. In addition, stainless steel hexagon bolts can be categorized into knurled and non-knurled types according to whether the head is knurled. Generally speaking, bolts with a straight knurling process can be judged as authentic SUS304 production screws, while bolts without knurling may be slightly poorer material or have lower nickel content products. 

Applications: Stainless steel hexagonal bolts are widely used on various occasions that require high strength and high corrosion resistance, such as in machine tool equipment, chemical equipment, water pumps, ships—electric power equipment, etc. Full-thread stainless steel hexagon socket head cap screws are more commonly used, while half-thread stainless steel hexagon socket head cap screws are most widely used in export equipment. 

Production process: the production process of stainless steel hexagon socket head cap screws is also an important indicator of its quality. Generally speaking, bolts with a straight thread knurling process can be judged as high-quality products, while bolts without knurling may be a compromise in material or process. However, the specific analysis should also be based on the report issued by the quality inspection unit. 

In summary, stainless steel cup head socket head bolts have become indispensable connecting elements in the industrial field with their high-quality stainless steel material, diverse application scenarios, and specific production processes.