External causes produce stainless steel screw lock phenomenon: too hard or too fast screwing also prone to lockup. Operation should try to install the bolts firmly and evenly. The force is too large or too fast will make stainless steel screws temperature rise caused by excessive bolt lock. Try not to use power tools to operate. Martensitic stainless steel: 410 and 416 can be heat strengthened, hardness 35 ~ 45HRC, good machining performance for general purpose corrosion resistant stainless steel screws. 416 higher sulfur content, is cutting stainless steel. 420 stainless steel screw, the sulfur content? R0.15% stainless steel screws Yantai optimal mechanical performance improvement can be heat strengthened, maximum hardness 53 ~ 58HRC Weihai specifically for stainless steel screws for applications requiring high strength stainless steel screws. Precipitation hardening stainless steel: 17-4PH stainless steel screws lowest Heze, PH15-7Mo, they can get more than the usual 18-8 stainless steel higher strength, they have been used for high-strength, corrosion-resistant stainless steel screws. Heze stainless steel screws lowest _ Jinan Road ground (certified) _ stainless steel screws provided by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (daoqinshangmao.com) Shandong Jinan, hardware accessories leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Jinan Road ground in leadership with the staff warmly welcome all inquiries negotiations to create Jinan Daoqin a better future.