Custom Stainless Steel 302 Threaded Screw Inserts

International Labelling Method for Stainless Steel

The IASA(American Iron and Steel Institute) uses three-digit numbers to label standard grades of malleable stainless steel. Including:

1. Austenitic stainless steel is marked with 200 and 300 series numbers. For example, some ordinary austenitic stainless steels are labeled 302, 304, 316, and 310.
2. Ferritic and martensitic grade stainless steel are indicated by 400 series numbers.
3. Ferritic stainless steel is labeled 430 and 446. Martensitic stainless steels are labeled 410, 420, and 440C.
4. Stainless Steel, Precipitation-hardening stainless steel, and high alloys with less than 50% iron content are usually patented or trademarked.

The difference between 302 stainless steel and 304 stainless steel

Different application scope: 304 stainless steel is a common stainless steel material, whose density is 7.93g/cm³, and also known as 18/8 stainless steel in industry.

800℃ high-temperature resistance, with good processing performance, and high toughness, and is widely used in industry and furniture decoration as well as food and medical industry.

302 stainless steel has high strength after cold processing, but the elongation is slightly worse than 1Cr17Ni7. It is applied in the construction industry.

Different mechanical properties: 302 yield strengthMPa：≥205, tensile strengthMPa：≥520(hardness hb≤187）, elongation/%：≥40.

304 ensile strength (MPa)≥515-1035, yield strength(MPa)≥205, elongation/%≥40, hardness≤201HBW≤92HRB≤210HV.

Different amounts of carbon: 302 has the same corrosion resistance as 304, but is stronger than 304 stainless steel due to its relatively high carbon content.

Numbering and Representation Method of Steel

1. Adopt international symbols of chemical elements and native symbols to denote chemical composition, and Arabic letters to represent component content, For example, China, Russia 12CrNi3A
2. Adopt the fixed digit numbers to represent steel series or numbers; Such as in The United States, and Japan, Series of 300, 400, and 200;
3. A serial number consisting of Latin letters and sequences, indicating purpose only.

Numbering rules in our country

①Use element symbols

②Application, Chinese pinyin. Martin Steel: P. Rimmed Steel: F. Killed steel: B.

A classification steel: A. GCr15：Ball bearing.

• CrMn, Spring steel, such as 20CrMnTi 60SiMn. (C content is expressed in parts per million)
• Stainless steel, and alloy tool steel(The content of C is in parts per thousand), such as 1Cr18Ni9 represent 0.1%C. C≤0.08% represents stainless, such as 0Cr18Ni9. C≤0.03% represents ultra-low carbon, such as 0Cr17Ni13Mo.

What kind of Plastic Material Is Used for Encapsulation/Rubber Head Screws:

Material TPE and TPR. The product material used to be PVC, but now most products are made of TPE material, and the hard plastic part is PP.

TPE material is also commonly known as artificial rubber, which can be bonded with PP, ABS, PC, PA, etc., and has good elasticity and skid resistance.

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Encapsulation Screws Application Scope

To solve the product matching, make the screw more convenient adjustment and fixation, so the rubber head screws appeared.

It was designed according to torsion and using environment, different shapes of the mold, then put inside and outside the regular hexagon screws, round head screws, countersunk head screws, include screw placement in special molds, and then adjust the teeth and use requirement according to the drawing and thread size, put dry and color matching of plastic injection molding machine melt glue, plastic injection forming, the final cooling and manufactured products, They’re called plastic handle screws.

It is to design different shapes of molds according to the torque and use environment, and then place the conventional internal and external hexagonal screws, round head screws, countersunk screws, machine screws, etc. in a special mold, and then adjust the teeth according to the drawings and usage requirements.

The length and the size of the thread, and then the dried and color-matched plastic is melted by an injection molding machine, injection molded, and finally cooled.

Advantages of YIJIN Hardware:

1. We can bond the rubber and hardware strongly.
2. Customized according to the price, free proofing (mold opening).
3. Fast proofing time (1~3 days), and fast delivery.
4. Extensive service life (more than 10 years).
5. Continuously track the use of products, and constantly improve the product.
6. Factory made.

Since its establishment, Yijin Hardware in line with the principles of professionalism, honesty, and excellence, providing customers with high-quality, fast, and convenient service.

At the same time, we are always strict with ourselves, with reasonable prices, perfect service, and customer demand-oriented, to improve production efficiency and quality as the goal, and constantly improve the defects of products, ultimately providing customers with excellent bolts nuts, and screw manufacturing.

And keep pace with the industry, learn advanced technology, for customers to bring more comprehensive solutions!

We adhere to customer demand-oriented, to improve production efficiency and quality, constantly improve product defects, keep pace with the industry, learn advanced technology, and bring customers more comprehensive fastener solutions!