First, the bolt performance grade, that is, the performance grade of bolts for steel structure connection, divided into more than 10 grades of 3.6, 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9, 12.9. The bolts for steel structure connection are classified into more than 10 grades of 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc., of which the bolts of grade 8.8 and above are made of low carbon alloy steel or medium carbon steel and heat treated. (Quenching, tempering), collectively referred to as high-strength bolts, the rest are collectively referred to as ordinary bolts. The bolt performance grade label is composed of two parts, which represent the nominal tensile strength value and the yield ratio of the bolt material.
Second, the steel structure connection bolt performance grade is divided into 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and other more than 10 grades, of which 8.8 grade and above bolts are low carbon alloy steel or medium carbon steel and After heat treatment (quenching, tempering), commonly known as high-strength bolts, the rest are commonly referred to as ordinary bolts. The bolt performance grade label is composed of two parts, which represent the nominal tensile strength value and the yield ratio of the bolt material. For example: a bolt with a performance class of 4.6, which means:
1. The nominal tensile strength of bolt material is up to 400MPa.
2. The yield ratio of the bolt material is 0.6.
3. The nominal yield strength of bolt material is up to 400×0.6=240MPa
Performance grade 10.9 high strength bolts, after heat treatment, can achieve:
1. The nominal tensile strength of bolt material is up to 1000MPa.
2. The yield ratio of the bolt material is 0.9.
3. The nominal yield strength of the bolt material is 1000×0.9=900MPa.
Hex Groove Mushroom Head Locking Screw
DIN, GB, ANSI, BSW, JIS,GOST
Small Box+Carton+Pallet or as Customer Request
Place of origin
White zinc, blue white zinc, color zinc, black zinc, nickel, copper
Unit price (FOB)
Minimum order quantity
One day production
Commonly used screws are classified as follows:
PA--round tip screw
PB--round head flat screw
PT--round head screw
BA - big pointed screw
BT--Flat foot screw
KA--flat tip screw
KB--flat flat foot screw
KT--flat head screw
PWA/ WA--with meson tipped screws
PWB /WB--with meson flat feet
PWT/ WT--with meson set screw
PM--round head machine screw
KM--flat flat foot machine screw
Stainless steel screws, as the name suggests, must be made of stainless steel screws and wire rods. The performance of stainless steel screws is mostly related to stainless steel. Consider the performance and organization of stainless steel, and understand the performance of stainless steel. Therefore, it is understood that stainless steel has good mechanical properties such as rust resistance, corrosion resistance, high temperature resistance, etc., and stainless steel screws certainly have these good mechanical properties. As stainless steel materials become more and more excellent. The mechanical properties of stainless steel screws produced by the screw industry are getting better and better. Anti-rust, anti-corrosion ability, and high temperature and high pressure is getting stronger.
Product Application Scenario
Stainless steel screws are widely used in machinery, petrochemical, telecommunications, chemical, construction, power, textile, sports equipment, paper, sewage, shipbuilding, automotive and other industries. With the improvement of domestic economic living standards, the application range of stainless steel screws will be more widely.
Mainly used for: environmental protection equipment, medical equipment, communication equipment, power facilities, electronic products, instrumentation, food machinery, petrochemical, ship assembly, pump and valve pipelines, building curtain walls, outdoor venues, sports facilities, outdoor decoration, etc.
Q1: Are you a manufacture or trading company?
A: We are a professional hardware manufacturer.But, we have the right to do the import & export business. Actually, we have this experience for many years.
Q2: Can you provide samples?
A: For our regular products, we offer free samples. For customized bolts, tooling and proofing charges need. All free samples not including its courier charge.
Q3: Do you support customized products?
A: Sure, we can produce the customized products per your drawings and other requirements.
Q4: What is the lead time of the product?
A: Generally 30-50 days after the deposit.
Packing and Shipping
1. For bulking: 25 kg in a carton
2. For small box packing: 1000/500 pcs or according customers in one box/polybag
3. For large orders we can put design according customer requirement