About Us
The screws/bolts is composed of the head,the rod and the end of the rod from the beginning to the end.Each screws/bolts has four major elements:head shape, screwing method,thread type and end type.Head shape - head shapes vary.There are round head (half round head),flat round head, round head flange (with PAD),flat round head flange (with PAD),pan head,pan head flange (with PAD), countersunk head,semi countersunk head,cylindrical head, spherical cylindrical head,horn head,hexagon head,hexagon flange head,hexagon flange (with PAD),etc.Screwing methods - there are various screwing methods.External wrench:Hexagon, hexagon flange face,hexagon flange,hexagon flower shape,etc; Internal wrenching: straight groove, cross groove H(Phillips), cross groove Z(pozidriv),cross groove f(frearson),square groove (scrulox),compound groove,internal spline,internal hexagon flower (plum blossom groove),internal triangle,internal hexagon, internal 12 angle,clutch groove, six blade groove,high torque cross groove,etc.Thread types - there are many kinds of threads. There are self tapping thread(wide thread),machine thread,dry wall nail thread,fiber board nail thread,and some other special threads.In addition,threads can be divided into single lead (single head),double lead(double head),multi lead(multi head) and high and low thread double head threads.End type-the end type mainly includes saw end and flat end.A groove,a notch or a part similar to a drill bit shape having a cutting function can be processed according to the use function.In some standards,the same saw end or flat end also has different forms.For example, whether or not to cut the tail.
The product standards include GB,DIN,ISO,ANSI,ASME,BS,JIS,GOST.In addition,various non-standard screws are produced according to the requirements of customers.
Over the past 16 years,we have accumulated rich experience and a number of large-scale production equipment(including but not limited to wire drawing machine,multi position cold heading machine,tool folding machine,casting molding machine,walking machineand packaging equipment) with a more complete production line.Annual output of 6,000 tonnes.
Since its establishment,the company has been pioneering and innovating,adhering to the business philosophy of"professionalism,integrity and win-win",taking"the most reasonable price,the most perfect service and the best quality products"as the service purpose,and winning unanimous praise with excellent value and uncompromising quality in accordance with International Fastener manufacturing standards.The company has a number of invention patents, with abundant financial resources,large-scale production,perfect marketing network and high-quality service,it sells well in more than 100 countries overseas and are well received by customers.Has established lasting cooperation with dozens of foreign suppliers.
Why choose us
(1)Quality:Products use high-quality materials to ensure quality. We have a professional QC team to inspect every project from production to packaging.And before leaving the factory,all specifications of products are sampled and tested to ensure stable quality.
(2)Samples: We can provide samples from stock (not included in the delivery),and support customised samples from pictures, samples will be sent upon order.
(3)Efficiency:Fast production time.If the order is not higher than 500 tons, we usually deliver the goods within 30-45days.
(4)Logistics:We are within 87 kilometres of the two nearest international airports and just over two hours' drive from the ports of Shanghai and Ningbo, making express logistics very convenient.
(5)Transportation:We have transportation department and freight forwarder,so we can ensure faster delivery and better protection of goods.
(6)Service:We have a professional customer service team，customer service answers customer questions online 24 hours a day.
(7)Price:Our price is superior to the same products,and good value for money.
(8)Support:We accept OEM,as your requirements,and guarantee competitive price and quality to serve you.
PS:Before shipment, we will sample the screws of each specification for basic test.
The basic test items we do:hardness test,yield ratio, torque value,anti slip coefficient,tensile strength,nondestructive testing,stress test,thread test,size test,preload test.If you have requirements,you can also carry out salt spray test and fault analysis.Let you buy at ease and use at ease.
Main product features
Although there are many kinds of screws/bolts, they all have the following main characteristics:
(1)It is generally made of carburized steel(accounting for 99% of the total product).Stainless steel or non-ferrous metal may also be used.
(2)The product must undergo heat treatment.Carbon steel screws/bolts must undergo carburize treatment,and stainless steel screws/bolts must undergo solution hardening treatment.So that the screws/bolts can meet the mechanical performance and service performance required by the standard.
(3)The product has high surface hardness and good core toughness，Straight,not easy to break,sharp thread, good drill ability.That is,"soft inside and hard outside".This is a major feature of the performance requirements of screws/bolts. If the surface hardness is low,it cannot be screwed into the base; If the toughness of the core is poor,it will break once screwed and cannot be used.Therefore,"soft inside and hard outside"is that screws/bolts meet the requirements of service performance.
(4)The product surface needs surface protection treatment, generally electroplating treatment.Some products need phosphate treatment(phosphating) on the surface.For example, the self tapping screws of wallboard are mostly photostatted.
(5)It is produced by cold heading process.It is recommended to use high-speed cold heading machine,high-speed wire rolling machine or high-speed planetary wire rolling machine to ensure product quality.The screws/bolts produced in this way has good head forming and high thread quality.
