A nut is a type of fastener with a threaded hole. Nuts are almost always used in conjunction with a mating bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads' friction (with slight elastic deformation), a slight stretching of the bolt, and compression of the parts to be held together.

Stainless Steel hex nut, Flange Nut, Heavy Hex Nut, Hex Cap Nut, Round Nut, Slotted Nut ,Square nut Lock  nut Cage nut T Slot Nut 
he most common shape today is hexagonal, for similar reasons as the bolt head: six sides give a good granularity of angles for a tool to approach from (good in tight spots), but more (and smaller) corners would be vulnerable to being rounded off. It takes only one sixth of a rotation to obtain the next side of the hexagon and grip is optimal. However, polygons with more than six sides do not give the requisite grip and polygons with fewer than six sides take more time to be given a complete rotation. Other specialized shapes exist for certain needs, such as wingnuts for finger adjustment and captive nuts (e.g. cage nuts) for inaccessible areas.

Specifications:

The company′s products are sold to various engineering bureaus and public works departments in China. In addition, they are exported to the United States, Canada, Russia, Australia, Japan, Argentina, Brazil, Portugal, Italy, Greece, Indonesia, Vietnam, Kenya, Zambia, South Africa, Chile, etc. And other countries and regions, recognized and trusted by the construction unit and the owner unit! 

Our equipment: 

The total production area of Kingrail Parts is 55, 000 square meters, including a 40, 000 square meter factory and 10, 000 square meter warehouse. The production mill covers over 100, 000 square meters equipped with steel rolling and casting lines, rail elastic clip lines, fish plate lines, spike & bolt lines, heating treatment line and surface anticorrosion treatment line as well as electro galvanizing, hot galvanizing and Dacromet processing lines. Our technical force is strong, the inspection method is complete, we can strictly implement the national railway standards for production. 

1.How about our sales areas?
We are based in Anhui province, China, sell to North America(28.00%),Oceania(13.00%),Western Europe(13.00%),Africa(11.00%),Southeast Asia(10.00%),Eastern Europe(10.00%),South America(10.00%),Eastern Asia(5.00%). There are 11-50 people in our sales team.

2. How can we guarantee quality?
As far as the most concerned quality is concerned, we have a 24-hour quality control team at the workshop to ensure the consistent quality in accordance with 16 strict quality inspection steps. In each processing step, we follow strict quality rules. What's more, every 3 pieces of products will be selected from 100 pieces at random as testing targets in our laboratory with formal quality testing report. Under such a thorough quality system, we have never got any complaint from our buyers up to today.
Always a pre-production sample before mass production;
Always final Inspection before shipment;We promise the production which shipped to you is qualified under the international standards of metal products.

3.What can you buy from us?
Rail wheels,rail track materials,screw spikes,track spikes,bolts, elastic clips,rail clip.rail shoulder,fish plate,tie plate,base plate,washer,nut ,heat pumps and other metal products.

4. Why should you buy from us not from other suppliers?
Experienced and professional technical and marketing team ,strict quality control, 10% inspection before delivery .Quick delivery
time, no MOQ request, competitive price Quick feedback for quotation and after sale service.You are not only buy the competitive products,but also our best service during all the process importantly.

5. How long is the Delivery Time?
Generally within 25-30 days for a 20ft container after the prepayment received.

6.What is your terms of payment ?
30% of the payment in advance , the balance before shipment via T/T.
7.Q: Do you have any certifications regarding fishplate?
A: We have passed the certification of CRCC in China and ISO9001:2008 overseas. Before shipment, Certificate of Quality can be supplied. We also accept Third Party Inspection from clients, with free samples to supply.

8.Will that be possible for us to receive pieces of samples for approval?
Sure. The samples can be supplied for free but the freight counts on you.