When it comes to U-bolts, most people must be very familiar with them. U-bolt, also known as U-clamp. A bolt commonly used in pipe installation to fix the pipe. The bolt is U-shaped. Used to link two firmware. Without saying much, Xiaorui will introduce U bolt standards to you carefully.
Basic introduction of U-bolt:
1. The characteristic density, bending strength, impact toughness, compression strength, elastic modulus, tensile strength, temperature resistance and color of materials shall be determined according to the use environment.
2. The commonly used materials are carbon steel, galvanized steel and stainless steel. The stainless steel materials include 304, 321, 304L, 316, 316L, 317, 317L and 310S.
3. National standard for U-bolts: JB/ZQ4321-1998.
Material: U-bolts are divided into iron bolts, that is, carbon steel bolts and stainless steel bolts. Stainless steel includes stainless steel SUS201 and stainless steel SUS304.
Specification of U-bolt
First, the thread specification shall be marked, and then the outer diameter of the pipe to be clamped.
Example of standard marking for U-bolts
Marks of U-bolts for fixing pipes with OD D0=25mm;
U-bolt 25 JB/ZQ 4321-97
Marks of U-shaped bolts with galvanized surface for fixing pipes with outer diameter D0=25mm;
U-bolt 25 Zn JB/ZQ 4321-97
Some basic standard specifications of stainless steel U-bolts:
M6*22 27 34 42 48 60 76 90 114
M8*22 27 34 42 48 60 76 90 114 135 161
M10*34 42 48 60 76 90 114 135 161 220 275 328
M12*42 48 60 76 90 114 135 161 220 275 328
M16*60 76 90 114 135 161 220 275 328
Other basic standard parameters of U-bolt:
1. Locking principle of stainless steel U-bolt: eliminate (or limit) the relative movement between thread pairs, or increase the difficulty of relative movement.
2. Material of stainless steel U-bolt: 304 302 321 304L 201 667 668 316 316L
3. Marking of stainless steel U-bolt: thread specification is 20mm, material is 20 # steel, and A-type lug bolt is marked as GB825M20
4. Application of stainless steel U-bolt: stainless steel U-bolt is generally used for installation and fixation. It is generally used in pipe fixing, wire rope fixing and other occasions.
5. Surface treatment of stainless steel U-bolt: bare body or galvanization shall be made in strict accordance with the drawings to ensure quality.
How to select the bolt grade
1. [From the perspective of raw materials]: high-strength bolts are made of high-strength materials. The screws, nuts and washers of high-strength bolts are made of high-strength steel, commonly used as No. 45 steel, 40 boron steel and 20 manganese titanium boron steel. Ordinary bolts are usually made of Q235 steel.
2. [From the strength grade]: high-strength bolts are increasingly used. Two strength grades, 8.8s and 10.9s, are commonly used, most of which are 10.9. The strength grade of ordinary bolts shall be low, generally 4.4, 4.8, 5.6 and 8.8.
3. [From the stress characteristics]: high-strength bolts exert pretension and transmit external force by friction. Ordinary bolt connection transmits shear force by bolt rod shear resistance and hole wall pressure bearing. The pre tension generated when tightening the nut is very small, and its impact can be ignored. In addition to the high material strength, high-strength bolts also exert a large pre tension on the bolt, which makes the connecting members generate extrusion force, so that there is a large friction force perpendicular to the screw direction. In addition, the pre tension, anti slip coefficient and steel type directly affect the bearing capacity of high-strength bolts.
4. [From the perspective of use]: High strength bolts are generally used to connect the main components of the building structure. Ordinary bolts can be reused, while high-strength bolts cannot be reused. High strength bolts are generally used for permanent connection.
For Jinrui, whether you are a fastener demander/dealer/supplier, you can visit the official website of Jinrui:www.chinajinrui.net
Part of Jinrui's product display
Jiangsu Jinrui Metal Products Co., Ltd. is the production base of Shanghai Jinrui standard parts. The factory covers an area of more than 20000 square meters, with a registered capital of 50 million yuan, a total investment of more than 100 million yuan, and an annual output of more than 20000 tons. Its products are exported to more than 40 countries.
Since its establishment in 2001, Jinrui Company has developed into a new layout with Hai'an in Jiangsu as its production base and Baoshan in Shanghai and Nanyang in Henan 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 called fishtail bolts), internal and external hexagon bolts, hexagon flange bolts, carriage bolts, wheel hub bolts, etc
2. Stud products: full thread thread, double head studs, etc
3. Nut products: hexagon nut, flange nut, heavy nut, square nut, butterfly nut, etc
4. Screw products: self tapping screws, self tapping self drilling screws, wood screws, various machine screws, etc
5. Washer products: flat washer, spring washer, square washer, lock washer, etc
6. Fastener related non-standard products
The wire drawing plant under Jinrui Company also provides processing services such as fine drawing, rough drawing and spheroidizing of wire rods, and supplies finished wire rods of various domestic famous steel mills.
Adhering to the business philosophy of "pioneering and innovating, pursuing excellence", Jinrui has successively introduced multiple types of heading and forming machines, thread rolling machines, nut machines, hot heading and rolling machines, lathes, large hot heading machines and their supporting testing equipment, such as magnetic particle flaw detectors, metallographic analyzers, salt spray testing machines, direct reading spectrometers and optical screening machines, tensile machines, Vickers hardness meters, Rockwell hardness meters, etc., and has set up independent research and development departments, It can produce all kinds of high-quality fasteners such as GB, DIN, ANSI, JIS and ISO international standards. The products are widely used in petroleum, chemical industry, boiler, wind power generation, highway guardrail board, elevator guide rail, machinery manufacturing, construction sites, auto parts, medical equipment and other fields.
Jinrui has been developing vigorously since its establishment. It integrates the advantages of each company, carefully designs and strictly selects materials to make the products more durable, and is highly 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 automobile quality management system certification in 2012. The People's Insurance Company of China underwrites the "Global Product Liability Insurance" for its products, ensuring that every screw can be used with confidence, determination, and peace of mind!
Whether now or in the future, Jinrui will always adhere to the core service concept of "quality first, science and technology to revitalize enterprises, users first, and considerate service", sincerely provide you with high-quality services and high-quality products, and Jinrui will also become your most loyal long-term partner.
