The use of mechanical equipment is inseparable from the support of fasteners, but in the design of mechanical equipment, almost all designs use hexagon socket screws, whether countersunk or not.
Some friends may be very puzzled, why do so many devices use hexagon socket screws instead of external hexagon screws? What is it good for? Today, Xiaorui will discuss with you, the advantages between external hexagon screws and socket screws disadvantage.
The threads on the outer hexagon bolts are generally ordinary threads with fine teeth and ordinary threads with round teeth.
Hexagon bolts are the most commonly used bolts. A-level and B-level outer hexagons are used more and are more important. And it is used more in occasions where the assembly precision is high, and it is subjected to large shock, vibration or cross rate load. The C-grade outer six or six bolts are used for occasions where the surface is relatively rough and the assembly accuracy is not high.
The advantage of the outer hexagon is that the preload contact area is large, and a large preload can be used. It is generally used in large equipment, and the price is lower than that of the inner hexagon. The disadvantage is that it occupies a large space and cannot be used in countersinking.
Hexagon socket head cap screws are often used in machinery, and they mainly have the advantages of being easy to tighten, disassemble, and not easy to slip angles. Allen wrenches generally have a 90° turn. One end is long and the other is short. When using the short side to drive the screw, holding the long side can save a lot of force and tighten the screw better. The long end has a round head (a hexagonal cylinder is similar to a sphere) and a flat head, and the round head can be easily removed obliquely, and some parts that are inconvenient to lower the wrench can be installed.
The manufacturing cost of the outer hexagon is much lower than that of the inner hexagon, and its advantages are that the screw head (the force position of the wrench) is thinner than the inner hexagon, and some places cannot be replaced by the inner hexagon. In addition, machines with low cost, low power strength and low precision requirements use much less hexagon socket screws than external hexagon screws.
The advantage of the hexagon socket is that it takes up less space and can be used as a countersunk head. It is generally used on small equipment. The disadvantage is that the preloading contact area is small and cannot use too much preloading force.
So why can hex socket screws be seen in many mechanical devices?
1. Bear more load
Hexagon socket head bolts have six force-bearing surfaces, which are more durable than flat-head screws and cross-shaped screws with only two surfaces.
Note: The material of hexagon socket head cap bolts is generally made of stainless steel, carbon steel, and alloy steel, which is basically the same as that of other types of screws. The higher the performance level, the greater the strength. When choosing screws, you must choose them strictly according to the requirements of use For screws of suitable performance grades, different grades have different prices.
Second, it can be dealt with
The whole nut is sunk into the inside of the workpiece, which can keep the surface of the workpiece smooth and beautiful.
3. Easy to install
Compared with the outer hexagon screw, the inner hexagon is suitable for more assembly occasions, especially in narrow occasions, so it is very convenient to assemble and maintain, and it is also convenient to debug.
Fourth, not easy to disassemble
The tools we usually use are adjustable wrenches, screwdrivers and dead wrenches, etc., and special wrenches must be used to remove hexagon socket bolts, so it is not easy for ordinary people to remove them, which is also a benefit.
Some products of Jinrui
Jiangsu Jinrui Metal Products Co., Ltd. is the production base of Shanghai Jinrui standard parts. The factory covers an area of more than 20,000 square meters, with a registered capital of 50 million yuan, a total investment of over 100 million yuan, and an annual output of more than 20,000 tons. The products are exported to more than 40 countries overseas.
Since its establishment in 2001, Jinrui has developed into a new layout with Jiangsu Haian as its production base and Shanghai Baoshan and Henan Nanyang as its sales centers after more than 20 years of unremitting efforts.
At present, Jinrui's main products include the following six categories:
1. The main products of bolts include: metric and American round head oval neck bolts (also known as fishtail bolts), inner and outer hexagon bolts, hexagonal flange bolts, carriage bolts, wheel hub bolts, etc.
2. Stud products: full thread rods, double-ended studs, etc.
3. Nut products: hex nuts, flange nuts, heavy-duty nuts, square nuts, wing nuts, etc.
4. Screw products: self-tapping screws, self-tapping self-drilling screws, wood screws, various machine screws, etc.
5. Washer products: flat washers, elastic washers, square washers, locking washers, etc.
6. Fastener related non-standard products
The wire drawing factory under Jinrui Company also provides wire rod fine drawing, rough drawing and spheroidizing and other processing services, and supplies the finished wire rods of various domestic big brand steel mills.
In line with the business philosophy of "pioneering and innovating, pursuing excellence", Jinrui has successively introduced multiple types of head forming machines, thread rolling machines, nut machines, hot upsetting thread rolling machines, lathes, large hot upsetting machines and their supporting testing equipment, such as Magnetic particle flaw detector, metallographic analyzer, salt spray testing machine, direct reading spectrometer and optical screening machine, tensile machine, Vickers hardness tester, Rockwell hardness tester, etc. ), German standard (DIN), American standard (ANSI), Japanese standard (JIS) and ISO international standards and other high-quality fasteners. Products are widely used in petroleum, chemical industry, boilers, wind power generation, highway guardrails, elevator guide rails, machinery manufacturing, construction sites, auto parts and medical equipment and other fields.
Jinrui has developed vigorously since its establishment. Set each director, careful design, strict selection of materials, make the product more durable, well received and praised by the majority of users. Jinrui won the ISO9001:2000 international quality system certification in 2001, the special equipment manufacturing license in 2010, and the TS16949 automotive quality management system certification in 2012, and the products are underwritten by the People's Insurance Company of China "Global Product Liability Insurance" to ensure that every A screw must be used by customers with confidence, firmness and peace of mind!
No matter now or in the future, Jinrui will always adhere to the core service concept of "quality first, technology development, customer first, and thoughtful service", and sincerely provide you with high-quality services and high-quality products. Jinrui will also Be your most loyal long-term partner.
