English 
DIN7991
QTA / JJ
1.DIN 7991 standard specifications
The corresponding national standard of din7991 is GB/T70.3-2000.
2. DIN7991 standard hardness grade
Since the din7991 hexagonal countersunk screw is mentioned, by the way, let's talk about its hardness level. Different countersunk hexagon screws according to the hardness, carrying force, yield strength, etc. of the screw wire has a grade classification, din7991 according to the grade strength is divided into ordinary and high strength, ordinary din7991 hexagon screw refers to 4.8 grade, high strength din7991 hexagon screw refers to 8.8 grade above, including 10.9 and 12.9 grade. Class 12.9 DIN 7991 Allen screws generally refer to knurled, natural black Allen cup head screws with oil.
3.Production qualification
Our factory mainly produces stainless steel fasteners and various non-standard customized stainless steel products. We have more than 10 technical patent certificates, as well as CE certification, SAC / TC 85, ISO90001, CQM quality certification standard certificates and so on.
4.Deliver shipping and serving
Package: Cartons & pallets or according to customer's requirement.
We will use cartons and cartons for packaging. Then wooden pallets and wooden boxes will be used for outer packaging. If customers have special packaging requirements, we will do packaging according to customer needs.
5.Shipping method: We can provide various shipping methods such as sea, air and mail. We can also provide transportation services according to the special needs of customers.
6.Our services and advantages
1. We are a factory and we have the right and strength to design and produce.
2. Hex head bolt samples are free.
3. We will answer your inquiry within 24 hours.
4. After sending, we will track the product for you every two days until you get the product.
5. When you receive the goods, test them and give me feedback. If you have any questions about our goods, we will provide you with solutions.
7.FAQ
Q1.:Are you trading company or manufacturer ?
A1: We are factory.
Q2. What is your main products? A1:Our main products are fasteners: bolts, screws, rods, nuts, washers. Meantime, our company also produces non-standard stainless steel products according the drawing .
Q3.How to ensure that every process's quality? A2:Every process will be checked by our quality inspection department which insures every product's quality. In the production of products, we will personally go to the factory to check the quality of products.
Q4. How long is your delivery time? A3:It depends on if we have stock or not ,if we have the stock goods,we can delivery it within 3 days after receive the payment.And normally our production time is in 20 days for one container (20-26 tons) .
Q5.What is your payment method? A4:30% value of T/T in advance and the balance 70% before delivery .
Q6.What about the warranty ? A6:We are very confident in our products,and we pack them very well to make sure the goods in well protection. To avoid any subsequent trouble regarding quality issue,we suggest you check the goods once you receive them.If there is any transport damaged or quality issue,don’t forget take the detail pictures and contact us as soon as possible,we will properly handle it to make sure your loss to reduce to the smallest .
Q7.Can you provide a sample? A7:Sure, Our sample is provided free of charge, but not including courier fees.
Q8.Could you send me your catalog and price list ? A8:As we have more than thousands of products,it is really too hard to send all of catalogue and price list for you .Please inform us the style you interested,we can offer the price for your reference .
1.DIN 7991 standard specifications
The corresponding national standard of din7991 is GB/T70.3-2000.
2. DIN7991 standard hardness grade
Since the din7991 hexagonal countersunk screw is mentioned, by the way, let's talk about its hardness level. Different countersunk hexagon screws according to the hardness, carrying force, yield strength, etc. of the screw wire has a grade classification, din7991 according to the grade strength is divided into ordinary and high strength, ordinary din7991 hexagon screw refers to 4.8 grade, high strength din7991 hexagon screw refers to 8.8 grade above, including 10.9 and 12.9 grade. Class 12.9 DIN 7991 Allen screws generally refer to knurled, natural black Allen cup head screws with oil.
3.Production qualification
Our factory mainly produces stainless steel fasteners and various non-standard customized stainless steel products. We have more than 10 technical patent certificates, as well as CE certification, SAC / TC 85, ISO90001, CQM quality certification standard certificates and so on.
4.Deliver shipping and serving
Package: Cartons & pallets or according to customer's requirement.
We will use cartons and cartons for packaging. Then wooden pallets and wooden boxes will be used for outer packaging. If customers have special packaging requirements, we will do packaging according to customer needs.
5.Shipping method: We can provide various shipping methods such as sea, air and mail. We can also provide transportation services according to the special needs of customers.
6.Our services and advantages
1. We are a factory and we have the right and strength to design and produce.
2. Hex head bolt samples are free.
3. We will answer your inquiry within 24 hours.
4. After sending, we will track the product for you every two days until you get the product.
5. When you receive the goods, test them and give me feedback. If you have any questions about our goods, we will provide you with solutions.
7.FAQ
Q1.:Are you trading company or manufacturer ?
A1: We are factory.
Q2. What is your main products? A1:Our main products are fasteners: bolts, screws, rods, nuts, washers. Meantime, our company also produces non-standard stainless steel products according the drawing .
Q3.How to ensure that every process's quality? A2:Every process will be checked by our quality inspection department which insures every product's quality. In the production of products, we will personally go to the factory to check the quality of products.
Q4. How long is your delivery time? A3:It depends on if we have stock or not ,if we have the stock goods,we can delivery it within 3 days after receive the payment.And normally our production time is in 20 days for one container (20-26 tons) .
Q5.What is your payment method? A4:30% value of T/T in advance and the balance 70% before delivery .
Q6.What about the warranty ? A6:We are very confident in our products,and we pack them very well to make sure the goods in well protection. To avoid any subsequent trouble regarding quality issue,we suggest you check the goods once you receive them.If there is any transport damaged or quality issue,don’t forget take the detail pictures and contact us as soon as possible,we will properly handle it to make sure your loss to reduce to the smallest .
Q7.Can you provide a sample? A7:Sure, Our sample is provided free of charge, but not including courier fees.
Q8.Could you send me your catalog and price list ? A8:As we have more than thousands of products,it is really too hard to send all of catalogue and price list for you .Please inform us the style you interested,we can offer the price for your reference .
