What's the difference between hexagon screws and inner hexagon screws?

Hex screws and inner hex screws are one of the fasteners, what's the difference?Hexagonal bolts are round on the outside and concave hexagonal on the middle, and hexagonal screws are the regular hexagonal sides of the heads.

The hexagonal screwdriver looks like "7", which is made by cutting and bending the hexagonal steel bar at both ends to form an inner hexagonal spanner, while the outer hexagonal screw is the hexagonal screw with more hexagonal edges on the head.

The biggest differences are:

Hexagon screws are often used in machinery, mainly for fastening, disassembly, not easy slip Angle and other advantages.Allen wrench is usually a square shape, 90 ° bend bend at one end of the long and short, with a short side of the screw, holding a long side can save a lot of strength and better tighten screw.The long end is divided into a round head (hexagonal cylinder is similar to a ball) and a flat head, which can be easily obliquely disassembled.The manufacturing cost of the outer hexagon screw is much lower than that of the inner hexagon, and its advantage is that the screw head (the spanner position) is thinner than the inner hexagon, which can not be replaced in some places.In addition, low cost, low dynamic strength, low precision requirements of the machine used hexagonal screws more than hexagon less.

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Machine screws lubrication management method

In recent years, more and more fastener enterprises began to realize the importance of equipment machine screw lubrication.Some professional products and services such as oil testing services, precision filtration devices, special oil application, solve many equipment problems.Now, it seems that the comprehensive improvement of equipment gear box, friction pair oil selection, refueling, oil, pipe oil and other aspects is to obtain greater practical benefits.

At present most of the machine screw fasteners enterprises generally not establish special equipment lubrication management system, the lubricant is often overlooked, equipment failure, business leaders in the first place that is spare parts, machining accuracy, installation and other mechanical reasons, and neglect of accident more than 80% of the failures are caused by statistical regularity of oil, improper maintenance.Enterprises are short of the guidance of screw lubrication technicians. Over 95% of them, due to lack of knowledge of lubricant and neglect of lubrication work, have misused oil or improper oil, resulting in short service life of equipment, low production efficiency, frequent accidents, and unnecessary waste of energy.
The machine screw lubrication management method refers to the gear box and friction pair of equipment such as various types of cold-upsetting machine, continuous mesh belt furnace, chain-belt warm upsetting production line, punch, surface treatment coating or electroplating production line for fastener enterprises.Among them, gear box and friction pair are the core of lubrication 5-step management method.

1, pipe of oil
Set up active maintenance concept, change passive maintenance into active service.Use data to judge the wear boundary value, reduce more experience, less science, less sense of the way of thinking. Experience a healthy and sound lubrication chart, according to the computer lubrication chart operation.Constantly enrich and improve the formulation of various lubrication standards, necessary self-provided testing means and the combination of outsourced testing, the establishment and improvement of lubrication station (master station and sub-station).
On enterprise precision, large, scarce and critical equipment, fixed monitoring must be carried out to nip problems in the bud.Speed up the cultivation of lubrication technical personnel, using side project, side study, side cultivation of lubrication backbone rapid cultivation method.

2, choose oil
The weight is chosen according to the selection of oil (the main load, speed, temperature and medium of the cold header, and other conditions are considered if all four conditions are met). Oil should be selected in proper working conditions, and it is worth it, because the cost of equipment maintenance is more than 20 times of the cost of lubricating oil, and the cost of lubricating oil only accounts for 3% to 5% of the total maintenance cost.The upgrading and upgrading of oil products will become normal.

3, buy oil
The consumers must set up the oil purchase mode based on the equipment condition, and the concept of price selection must be changed.Oil and equipment procurement to comparison between three or even more, survival of the fittest.
Crude oil must be tested before application.Preferred product of famous brand, good after-sales service, can propose comprehensive lubrication solution of oil supplier cooperation.

4, refueling
The first thing you need to know is what kind of lubrication is needed for the lubrication points of the equipment.Under the condition of cold header, the intelligent oil collecting device is the best choice at present.
Company refueling equipment upgrade should adhere to comparison between three or even more, select the best option.It is very important to select a good supplier of lubrication equipment. The proposed scheme should be advanced in technology, reasonable in price, and provide whole-process tracking service, so as to cooperate with the lubrication equipment supplier who can propose a comprehensive solution.

5, oil
The institute focuses on three factors that cause oil deterioration, namely solid (particles, etc.), liquid (water, etc.) and gas.According to the test data of three factors, once exceed the standard, do rehabilitation treatment, two change oil.
In addition to purchasing an oil filter and purification plant or equipment, she adheres to the principle of comparison among three or even more suppliers, and chooses an oil filter and purification plant or equipment supplier that can provide comprehensive oil filter solutions. The proposed scheme should be advanced in technology, reasonable in price, and provide whole-process tracking service. Wipe off the oil mixture, avoid replacing the oil, and insist on changing the oil after cleaning.Insist on rehabilitation of oil products and recovery of waste oil,90 percent of oil products can be rehabilitated, true waste oil no more than 10 percent of the concept.

Shenzhen Qiangtuo Fastener Co., Ltd is a professional factory producing various kinds of machine screws,self tapping screws,bolts,nuts,pins,retaining rings,rivets. Qualified machine screws are available.

Problems with high strength fasteners

With the development and progress of the society, its industrial demand for fasteners is getting higher and higher. At present, high strength fasteners have a good prospect of development. However, there are still some problems with homemade high-strength fasteners.

1. Fastener is not qualified in hardness
Hardness is an important index of assessment fasteners, mechanical properties, for each performance level product adopted by the material is different, fasteners, choose when mechanical performance level is an important basis, the installation and use of working load should be determined according to the level of performance and installation torque, for a specific material, hardness should be controlled in a reasonable level, high hardness may reduce the fatigue resistance of the products, some enterprises in order to improve the strength of the product, the hardness at higher levels, caused part of the product.

2. The fastener guarantees the load and the wedge load is unqualified
Ensuring load and wedge load is the key item A for testing the mechanical properties of products under tensile load, especially for high strength fasteners.The guarantee load is to check the product's resistance to plastic deformation under the specified tension load. If the index fails to meet the requirement, the plastic deformation may be generated due to the effect of the pre-tightening force and the working load, thus reducing the pre-tightening force and making the connection loose.Wedge load test is to examine the tensile strength of bolt product and the combined strength of head rod. This index is unqualified. Under the action of large working load, especially the impact load, or when the support surface is under the action of partial load, it will break or turn around, resulting in connection failure and even safety accident.

3. Fastener size is out of tolerance
Fastener is a generic components, the size of the interchangeability requirement is higher, super bad will directly affect the compatibility, and even affect the connection strength, locking performance or life. The main cause of unqualified size one is the improper control of technical process, in order to save material will be part of the size control near the lower limit, no timely adjust equipment in the production process, using the ultra poor workers die: the second is the lack of inspection, process inspection and delivery inspection is lax, make some unqualified batch of qualified;Third, the measuring equipment in use can not be measured regularly, or even use more than the wear limit of the gauge.

4. The fastener decarburization layer is out of standard
The decarburization layer is also A type A project. Due to decarburization, the surface hardness and strength of the parts are greatly reduced, which seriously affects the surface contact strength and fatigue life of the fasteners. Decarburization is mainly caused by decarburization of raw materials, decarburization in the process of material reform and product heat treatment.

Qiangtuo Fastener Co., Ltd established since 2001,we can provide high quality high strength fasteners,including stainless steel eye bolts,stainless steel screws,stainless steel Hex Nuts,etc.Non-standard parts are also available.