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Heavy Hex Nuts

DATIAN (DT) Fastener is famous for producing quality heavy hex nuts. We, one of the professional heavy hex nut manufacturers, have a in house full line heat treatment machine used to improve the hardness and mechanical properties of heavy hexagonal nuts in order to serve different high requirement areas. The heavy duty hex nuts standard we listed below are most ASTM A194/A563 and ANSI/ASME B18.2.2 heavy hex nuts. Compare to finished hex nuts, the heavy hex nut carry higher grade and slightly wider and thicker diameters to meet the greater length of thread engagement and better resistance to stretching or widening. Contact DT Fastener, a professional nuts and bolts manufacturing company, for more info now!

Heavy Hex vs Hex The first thing to declare is that both heavy hex nuts and finished hex nuts belong to the hexagon nut classification. Simply put, the difference between them is that heavy hex nuts have larger widths across the flats and heights of the same nominal size. This gives heavy hex nuts higher load retention and tensile strength. This also explains why heavy hex nuts can be heat treated to achieve higher hardness.

There are two production processes for Datian Fastener's Heavy hexagon nuts - cold heading and hot heading.

The cold heading machine of Datian Fastener has the ability to form the nut from raw material to finished product at one time. Our cold heading machine integrates the rolling thread machine and the cold heading machine to maximize efficiency, ensure the customer's delivery requirements, and minimize the labor cost, which makes the price of our heavy hexagonal nut competitive all over the world.

Hot forming: Generally, hot forming is selected for larger fasteners, and the diameter range are generally 1''~4''~(M30~M100) or even larger. The material used in the hot heading machine is generally round steel, without cold drawing and pickling. The production step is to cut the material first, and then upsetting by the punch. The surface of the semi-finished product of red punching is rougher than that of cold heading. After tapping, the two sides of the nut are chamfered with a CNC machine, and finally it is completed after heat treatment and surface treatment.

Cold heading and hot heading are roughly divided into the following steps: Cold heading: wire drawing - cold heading - (heat treatment) - tapping - surface treatment

Hot forming: cutting material - red punching - chamfering - turning - (heat treatment) - tapping - surface treatment Or cutting material - upsetting ball - annealing, phosphating - forming - punching - (heat treatment) - tapping - surface treatment.

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Heavy Hex Bolt

The nearly 20 years that DATIAN (DT) Fasteners has specialized in the production of heavy hex bolts. Many customers need to purchase by sets. Our loyal customers usually need to source hex bolts / heavy hex head bolts together with hex nuts. As a professional heavy hex bolt factory, DT provides complete heavy hex bolt supply chain services. we are able to produce A307 B heavy hex cap screws, A193 B7 heavy hex bolts, A325 heavy hex screws, etc.

Heavy Hex Head Bolt Applications High-strength hexagon bolts are mechanical properties of grade 8.8 or above, and they are all bolts that require heat treatment

Bolts made of high-strength steel, or bolts that require a large pre-tightening force, can be called high-strength bolts. High-strength bolts are mostly used for the connection of bridges, rails, high-voltage, and ultra-high-voltage equipment. The fracture of this kind of bolt is a mostly brittle fracture. High-strength bolts applied to ultra-high pressure equipment need to be prestressed to ensure the sealing of the container.

Application areas of high-strength bolts: Steel Fabrication, Construction of Railroad Systems, Pumps, and Water treatment, Construction of Modular Buildings, and Renewable and Alternative Energy.

Heavy Hex Head Bolt Manufacturing Process Steps Include: Usually, the forming of the bolt head is processed by cold heading. The cold heading forming process includes cutting and forming, single-station single-click, double-click cold heading and multi-station automatic cold heading. An automatic cold heading machine performs multi-station processes such as stamping, heading forging, extrusion and diameter reduction in several forming dies.

(1) Use a semi-closed cutting tool to cut the blank, the easiest way is to use a sleeve type cutting tool.

(2) During the transfer of short-sized blanks from the previous station to the next forming station, the metal fasteners with complex structures are processed to improve the accuracy of the parts.

(3) Each forming station should be equipped with a punch return device, and the die should be equipped with a sleeve-type ejector device.

(4) The structure of the main slider guide rail and process components can ensure the positioning accuracy of the punch and the die during the effective use period.

(5) The terminal limit switch must be installed on the baffle that controls the material selection, and attention must be paid to the control of the upsetting force.

Heat Treatment Of High-Strength Heavy Hex Screw: High-strength nuts and bolts must be quenched and tempered according to technical requirements. The purpose of heat treatment and tempering is to improve the comprehensive mechanical properties of the heavy hex bolt to meet the specified tensile strength value and yield ratio of the product. The heat treatment process has a crucial impact on high-strength fasteners, especially their intrinsic quality. Therefore, in order to produce high-quality heavy hex head bolts, advanced heat treatment technology and equipment must be available.

As one of the leading heavy hex bolt manufacturers in China, DT Fastener possesses a complete production line of heavy hex cap screws. Feel free to contact us for more details!

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GB/T 923 Acorn Nuts

GB/T 923 acorn hex nut introduction:

GB/T 923 acorn hex nut is a nut with a cap, whose function is to prevent foreign impurities and moisture from invading the interior and cause corrosion and rust. At the same time, in places where some industrial machinery often comes into contact with the human body, the GB/T 923 acorn nuts and bolts are often selected as bolt capping to reduce the damage to the human body by the machinery.

The purpose of the acorn nuts bolts is the same as that of the hex nuts for sale. Its characteristic is that it is not easy to slip the main nut with a wrench during assembly and disassembly. dismantle. Mainly used for rough and simple parts.

GB/T 923 Acorn Hex Nut Specifications  GB /T 923 Acorn Nuts and Bolts GB /T 923 - 2009 Acorn Hex Nuts

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GB/T 889.2 Lockable Nut

GB/T 889.2 Lockable Nut GB/T 889.2 lockable nut has the following 3 advantages:

First, excellent anti-vibration performance: when the thread is tightened, the crest thread of the lockable nut and bolt tightly enters the 30° wedge-shaped slope of the nut and is clamped, and the normal force exerted on the wedge-shaped slope is the same as the bolt's normal force. The axis forms an included angle of 60° instead of 30°. Therefore, the normal force generated when the anti-loose nut is tightened is much larger than that of the ordinary standard nut, and it has a great anti-loose and anti-vibration ability.

Second, the wear resistance and shear resistance are strong: the 30° slope of the nut thread bottom can make the lockable nut locking force evenly distributed on the threads of all the teeth. Nuts can better solve the problems of thread wear and shear deformation.

Third, the repeated use performance is good: a lot of use shows that the locking force of the locking nuts and bolts will not decrease after repeated tightening and dismantling, and the original locking effect can be maintained.

GB/T 889.2 Lockable Nut Specifications  GB /T 889.2 Lockable Nut And Bolt GB /T 889.2 - 2016 Prevailing Torque Type Hexagon Nuts(With Non-Metallic Insert), Style 1-Fine Pitch Thread

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GB/T 12868 T Nuts

GB/T 12868 Black T Nuts Features: The principle of the inclined plane is adopted, the deformation of the inclined plane is integrated to form a thread, and then it is rotated into a parallel motion, the lead screw is rotated once, and the nut is moved to a pitch. GB/T 12868 black hex T nuts can effectively save time and effort.

GB/T 12868 Galvanized Black T Nuts Specifications  Heavy Duty T-Nuts GB /T 12868 GB /T 12868 - 1991 T-Slot Nut

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Railway Bolts And Nuts

Railway fasteners are widely used in urban rail construction.

In recent years, rail fasteners have been put into the field of railway and steel structures, and they are very popular and sought after.

Rail joints of railways are the source of vibration. In order to overcome this source of vibration and reduce the occurrence of rail joint diseases, the use of railroad track bolts and nuts is the best choice. They can eliminate the diseases of rail joints and increase the resistance of joints.

Although the construction of railways is inseparable from the role of railway fasteners, not all specifications and types of railway bolts and nuts are suitable for railway construction.

The strength of some ordinary railway fasteners cannot adapt to the vibration of high-speed rail, railway, and subway. All rail transportation requires high-strength railway fasteners.

As railway construction continues to increase, the demand for high-strength railway fasteners around the world will also rapidly increase. As one of the leading railway fastener factories in China, DT can provide you with quality railway fasteners at great prices. Feel free to contact at any time.

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Petrochemical Nuts And Bolts

The standard refers to the American ASTM or ASME standard with new and unique technical clauses added, which is suitable for a type of petrochemical fasteners used in high temperature and high-pressure environments, including bolts, studs, nuts, etc.

The mechanical properties and materials specified in GB/T3098/8 "Mechanical Properties of Carbon Steel Fasteners Part VIII Heat-resistant Threaded Connections" are suitable for fasteners that can withstand high temperature, alternating loads, and to a greater extent. Be sure to tighten the axial force.

High temperature and high-pressure petrochemical fasteners - commodity fasteners and special fasteners

Common Commodity wind energy fasteners: ●The type and size of hexagon head bolts meet the requirements of GB/T5782, A and B grades. The mechanical properties of these petrochemical fasteners refer to the performance grades of carbon steel bolts according to GB/T3098/1 standard: A2-50, A4-50, A2-70, A4-70;

●The nut type conforms to GB/T6170 I-type nut and special nut (pipe flange nut). Its mechanical properties refer to the performance grades of carbon steel according to the GB/T3098/2 standard: grades 6 and 8; the performance grades of stainless steel nuts of GB/T3098/15 are A2-50, A4-50, A2-70, A4-70 ;

Special Petrochemical Fasteners: ●In order to be suitable for the conditions of high-temperature resistance, low-temperature resistance, and environmental corrosion resistance, formulate suitable special fasteners, such as full-threaded studs for pipe flanges, in accordance with the provisions of GB/T901. The dimensions of hexagon head bolts and nuts shall be carried out according to national standards.

●Selected materials (grades) include medium carbon alloy steels: 35CrMo (applicable temperature +100-525℃); 25Cr2MoV (applicable temperature>-20--575℃); 42 CrMo (applicable temperature +100-525℃). The strength is between 690~890Mpa, that is to say, the medium carbon alloy steel is tempered at high temperature (550℃<=tempering temperature<=600℃) to obtain comprehensive mechanical properties to meet the service of high-temperature environment.

●Stainless steel materials selected are: 0Cr18Mi9 (applicable temperature -196--800 ℃); 0Cr17Mi12Mo2 (applicable temperature +196--800 ℃); the strength of stainless steel material obtained by solution treatment is between 690~890Mpa, and the performance level is A2- 70 A4-50 A4-80 grade.

●Using American standards, using stainless steel grades and materials: ASTM A193 B8 CL.2 (for temperature +196-525℃); A193 B8M CL.2 (for temperature +196-525℃); A453660 (for temperature +29- 525℃); also includes A320L7 suitable for low temperature and high-pressure environment (applicable temperature -100℃).

●Special grade nut material (grade) can choose medium carbon alloy steel: 30CrMo, 35CrMo; guaranteed load

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