A fastener is a hardware device that
mechanically joins or affixes two or more objects together.
Fasteners can also be used to close a
container such as a bag, a box, or an envelope; or they may involve keeping
together the sides of an opening of flexible material, attaching a lid to a
container, etc. There are also special-purpose closing devices, e.g. a bread
clip. Fasteners used in these manners are often temporary, in that they may be
fastened and unfastened repeatedly.
Some types of woodworking joints make use
of separate internal reinforcements, such as dowels or biscuits, which in a
sense can be considered fasteners within the scope of the joint system,
although on their own they are not general purpose fasteners.
Furniture supplied in flat-pack form often
uses cam dowels locked by cam locks, also known as conformat fasteners.
Items like a rope, string, wire (e.g. metal
wire, possibly coated with plastic, or multiple parallel wires kept together by
a plastic strip coating), cable, chain, or plastic wrap may be used to
mechanically join objects; but are not generally categorized as fasteners
because they have additional common uses. Likewise, hinges and springs may join
objects together, but are ordinarily not considered fasteners because their
primary purpose is to allow articulation rather than rigid affixment.
Other alternative methods of joining
materials include: crimping, welding, soldering, brazing, taping, gluing,
cementing, or the use of other adhesives. The use of force may also be used,
such as with magnets, vacuum (like suction cups), or even friction.
Fasteners are used for fastening and
application of a very broad class of mechanical parts. In all kinds of
machinery, equipment, vehicles, ships, railways, bridges, buildings,
structures, tools, equipment, instruments and supplies, such as the above, you
can see a wide variety of fasteners. It is characterized by many different
specifications, performance of different purposes, and standardization,
serialization, GM seed is also very high degree. Therefore, it was also the existing
national standards for a class called fasteners standard fasteners, or simply
standard parts. Fasteners are the most widely used machine parts. With China's
accession to the WTO in 2001 and entered the ranks of the international trading
nation. China's fastener products are exported to countries around the world,
the world's fastener products are constantly influx of Chinese market. As one
of the fasteners import and export volume of larger products, to achieve
international standards, to promote Chinese enterprises to the world of
fasteners, fastener enterprises to promote the full participation of
international cooperation and competition, with all the important practical
significance and strategic significance. Due to the specific requirements of each
specific fastener product specifications, dimensions, tolerances, weight,
performance, surface condition, marking methods, and acceptance inspection,
marking and packaging projects.
We supply big range of such fastener.
B.
Main particulars
MAIN
PARTICULARS
Material
Carbon
steel(20#-60#, S235-S355-), Alloy steel(4140,4340,42CrMo, -)
Standard
ASTM, ASME, DIN, JIS,
ISO, BS, API, EN
Certificate
ISO9001
Tolerance
Up
to +/- 0.002mm
Dimension
As
per drawing, as large as we can
Processing
CNC
turning, CNC turning and milling compound processing, 3/4/5 axis CNC
machining center, wire-cutting, EDM, grinding etc.
Finishing
surface
Machined
surface with oil, blasting and painting, anodize, polishing, powder painting,
electrophoretic coating-
Marking
as
per clients` requirements
Inspection
material,
construction, dimension, heat treatment, hardness, NDT
Quality
ISO9001,
PPAP control production
Lead
time
3-20
days for sample, consult with customer for mass production
Delivery
Express
for sample, ocean shipping/air for mass production
Our
Capabilities
CNC
machining, CNC center machining, drilling, milling, turning, grinding,
tapping, boring
Engineering
& manufacturing services
R&D
process, tooling and gauging design, product design
Integrated
CAD/CAM system, test and measuring
Others
Recyclable,
in line with environmental requirements and standards, and reliable
C.
Construction
Construction
by machining
D
Workmanship
The
workmanship have good production practice. Care are taken to ensure High
accuracy and smooth surfaces
E.
Certificates
-
Material certificates
-
Measuring reports
-
Inspection protocol
-
NDT reports
-
Fixed certificate: ISO9001 certificate
The photos of our Fastener
Our
service
Besides
above the general specifications, we can also supply some specific machining
parts as clients' requirements.
Package
and shipping
Export
cartons, pallets, wooden cases, Polybags
The size of the cold storage should be designed based on the maximum amount of agricultural products to be stored throughout the year. This capacity is calculated based on the volume required to store the product in the cold storage, plus the distance between the rows, the space between the stack and the walls, the ceiling, and the gap between the packages. After determining the capacity, determine the length and height of the cold storage. Cold storage design must also consider necessary auxiliary buildings and facilities, such as workshops, packing and finishing rooms, tool warehouses and loading docks, so that the quality of cold storage can be guaranteed. 
2. The selection and construction of insulation materials are very important to the quality of cold storage:
The selection of cold storage thermal insulation materials must be based on local conditions. It must have good thermal insulation performance and be economical and practical. Insulation materials are divided into several types. One is a plate processed into a fixed shape and specifications, and has a fixed length, width, and thickness. A plate of a corresponding specification can be selected according to the requirements of the installation of a cold storage body. Generally, high and medium temperature cold storage is selected 10 Thickness of the library plate, low temperature cold storage and freezing cold storage generally use 12 cm or 15 cm thick plate; the other can be sprayed with polyurethane foam, the material is sprayed directly to the built brick or concrete warehouse, after shaping Both moisture and heat insulation. Insulation plates include polyurethane, polyphenylene, and the like. Polyurethane is not water-absorbent and has good heat insulation, but its cost is high. Poly-phenyllate has strong water absorption and poor heat insulation, but its cost is low. The structure of the modern cold storage is being developed in a forward direction. It has been built into a warehouse structure that includes a moisture-proof layer and a thermal insulation layer. The advantage of this is that the construction is convenient, rapid, and portable, but the cost is relatively high.
3. The choice of refrigeration system is most important for the quality of cold storage:
The choice of cold storage refrigeration system is mainly the choice of compressor and evaporator. The refrigeration system is the core of the cold storage. It is mainly composed of a compression system, a condensing system, an evaporation system, and a regulating valve. In addition, there are accessories such as fans, ducts, and meters. The entire refrigeration system is a sealed circulation loop. The refrigerant circulates in the sealing system, and the supply quantity and the number of times of entering the evaporator are controlled as required to obtain a suitable low temperature condition. The compressor is the heart of the refrigeration system, which promotes the circulation of the refrigerant in the system. The function of the condenser is to eliminate the heat in the compressed gaseous refrigerant and condense it into a liquid refrigerant. The cooling methods of the condenser include air cooling, water cooling, and air-water combination. The air cooling is limited to small refrigerators. Application in refrigeration equipment. The role of the evaporator is to provide cold storage to the cold storage. The evaporator is installed in the cold storage. The blower blows the cooled air to various parts of the warehouse. The common cold storage is used to connect the evaporator and extend the air supply distance. The temperature dropped more evenly.
Fastener Parts,Metric Machine Screw,Oem Nut Fastener,Cap Screw Fastener
Shinvast Industry Ltd , http://www.shinvastindustry.com