Starwdh

Self Drilling Screws
Self-drilling screws can be identified by the drill bit shaped point of the screw and are designed for a variety of applications such as fastening metal to metal and metal to wood. Self-drilling screws do not require a pilot hole, which accelerates installation time and lowers the cost and need of additional drill bits. This extra functionality and cost saving feature makes self-drilling screws the clear choice for metal building construction. The drill points are numbers #1 through #5 and the amount of steel they can drill through increases as the numbered point increases. Typically, self-drilling screws are used in light gauge applications but a #5 drill point can drill through and fasten up 1/2" of steel. During installation, self-drilling screws will also tap threads to a degree.

High Tensile Hex Bolt, Fasteners and Fixings
For fasteners and fixings, high tensile steel is some of the best material on offer – and can be found in a number of homes and auto manufacturing. Screws and bolts made from high tensile steel can withstand high levels of strain without losing their strength or structure.

8.8 hex bolt is often referred to as the structural grade for bolts. It is the most common form of high tensile material and is usually stocked in plain finish or zinc. It can be plated in many other coatings.For 8.8 hex bolt, a torque wrench will be required for the tightening of said product. These products are built to last and work optimally under harsh usage and should be easily identifiable via a permanent marking on the head to allow the customer to differentiate them.

5mm Hex Bolt - STARWDH | 8.8 hex bolt 10.9 hex bolt 12.9 hex bolt High tensile hex bolt ans screw made from high tensile steel can withstand high levels of strain without losing their strength or structure. STARWDH Strive for products to meet customer needs.

castle nut
The Heat-Treated Castle Nut screws onto the AR15/M4 lower receiver extension (buffer tube) and keeps the receiver extension and lower receiver end plate secured in place. The large notches allow for positive engagement with a castle nut wrench for proper installation and torque. The smaller notches provide a location for the end user to stake the castle nut to prevent accidental loosening. Finished in a Mil-spec manganese phosphate.

metric castle nuts metric castle nuts Most of our fasteners have a light zinc plating over steel giving a more rust resistant finish

Fl**ge Nut
Material: Carbon Steel, Alloy Steel, Stainless Steel
Standard: IFI-145; DIN6923; ISO4161; ASME/ANSI B18.2; ASME/ANSI B18.16;JIS B1190
Measurement system: INCH, Metrica
Size: #6-3/4''; M5-M20
Grade / Class: SAE J995 Gr.2, 5,8; CL4, 5, 6, 8, 10, 12
Thread: M, UNC, UNF
Finish: Black Oxide, Zinc Plated(Clear/Blue/Yellow/Black),H.D.G , Y.Z.P ,Plain, Nickel, Chrome

Metric Fl**ge Nuts - STARWDH | OEM/ODM welcome | Fast delivery Fl**ge nut is a nut that has a wide fl**ge at one end that acts as an integrated washer. This serves to distribute the pressure.

Stainless steel hexagon socket screwsr
The stainless steel hexagon socket head screw, the national standard code is GB70.1/ DIN912, can also be called the stainless steel hexagon socket screw (but the first "stainless steel cylindrical head hexagon socket screw" is the most standard). Regarding the materials of stainless steel hexagon socket screws, there are nothing more than two kinds, one is SUS304, the other is SUS316, and in fact, there is another stainless steel material of SUS316L. There is a lot of information on the production materials of these kinds of stainless steel hexagon socket screws on the Internet, and we will not analyze their element components one by one. Mainly look at the production technical standards of different specifications of stainless steel hexagon socket screws and the size control range of the tolerances.

Stainless steel hexagon socket screws - STARWDH Stainless steel hexagon socket screws the national standard code is GB70.1, can also be called the Stainless Steel Cylinder Head Hexagon Screw

Hot Dip Galvanized hexagon Nuts
The national standard Hot Dip Galvanized hexagon Nuts is also called the national standard hot-dip galvanized nut. The two treatment methods are actually the same, but the names are different. Why is it called the national standard Hot Dip Galvanized hexagon Nuts? This is because the production standards of hot-dip zinc nuts are produced and processed in accordance with the national standards of GB/T6170 and GB/T52. Among them, the GB/T6170 national standard hot-dip galvanized nuts are grade 8 while the GB/T52 national standard Hot Dip Galvanized hexagon Nuts are grade 4, and the two materials are different.

Hot Dip Galvanized hexagon Nuts is also called the national standard The national standard Hot Dip Galvanized hexagon Nuts is also called the national standard hot-dip galvanized nut. The two treatment methods ......

How to maintain the screw
Screws used widely in machinery and equipment, for the performance of the mechanical equipment use also have close relations, suddenly get damaged in use process, if the screw and can cause severe damage to the equipment, lead to can’t normal operation, so we in the process of using screw, best for both maintenance and maintenance, so as to the use of more secure.

How to maintain the screw - STARWDH How to maintain the screw Screws used widely in machinery and equipment, for the performance of the mechanical equipment use also have close relations.

Starwdh updated their information in their About section.

Socket Screws

Already in the warehouse, ready to be shipped!
Cost-effective,
superior in quality,
Small MOQ,
Complete categories
Head: Cap/ Allen, Button, Flat/Countersunk
Drive: Hex Socket
D: M2.5-M48
L: 4mm-500mm
Customized welcome!

Please contact our sales representative to learn more!
www.starwdh.com
[email protected]

Self-tapping screw surface treatment
Surface treatment of self – tapping screws: most self – tapping screws are coated with zinc or zinc phosphate.Cadmium plating is rarely used because of its high cost and toxicity. If appearance is very important, nickel or chromium plating can be selected.

Self-tapping screw surface treatment - STARWDH STARWDH Surface treatment will not only increase the size , but also different surface treatment will affect the relationship between torque,

Special Alloy Fasteners:

Material: Hastelloy, Inconel, Monel

Size: 1/4”-4”, M5-M100

Customization is Welcome

Minimum Order Quantity

Contact with our team, [email protected]

www.starwdh.com

Self Drilling Screw
Self-drilling screws can be identified by the drill bit shaped point of the screw and are designed for a variety of applications such as fastening metal to metal and metal to wood. Self-drilling screws do not require a pilot hole, which accelerates installation time and lowers the cost and need of additional drill bits. This extra functionality and cost saving feature makes self-drilling screws the clear choice for metal building construction. The drill points are numbers #1 through #5 and the amount of steel they can drill through increases as the numbered point increases. Typically, self-drilling screws are used in light gauge applications but a #5 drill point can drill through and fasten up 1/2" of steel. During installation, self-drilling screws will also tap threads to a degree.
www.starwdh.com
[email protected]

"Quality is our culture."
Welcome know more about Drywall screws！
We are pleased to announce that in order to thank new and old customers, drywall screws will be sold at a discount.
Size (only): 3.5x25 or .
Discount period: March 12, 2021 to March 30, 2021.
Packing: 25kg/Bag
Total weight: 200 Tons.
[email protected]
www.starwdh.com

Tapping screws are commonly used for connections between thin metal plates.When connecting, first make a screw in the bottom hole of the connector, and then screw the self-tapping screw into the bottom hole of the connector.

Carbon steel tapping screws should be carburized, stainless steel tapping screws should be solution hardening.Self-tapping screws meet the standard requirements of mechanical properties and performance.Still have is the product surface treatment, generally for electroplating treatment.

How much do you know about self tapping screws? - STARWDH Tapping screws are commonly used for connections between thin metal plates.When connecting, first make a screw in the bottom hole of the connector.

What are the performance characteristics of self - tapping screws?
Self-tapping screw is mainly used in the steel structure of the color steel tile fixation, can also be used for simple building sheet fixation.

Self-tapping screws are often exposed to the outdoors and have strong corrosion resistance.

The rubber sealing ring can ensure that the screw is impermeable and has good corrosion resistance.

What are the performance characteristics of self - tapping screws? - Self-tapping screw is a kind of screw with drill bit. The hexagon socket bolt is constructed by special power tools, drilling, tapping.

What are the reasons for the fracture of stainless steel screws?
Stainless steel screws usually refer to steel screws that have the ability to resist corrosion from air, water, acid, alkali salt or other media.

According to the different alloy components, the focus is on rust resistance and acid resistance.

Although some steels are rust-proof, they are not necessarily acid-resistant, and acid-resistant steels are usually rust-proof.

What is the reason for the fracture of stainless steel screws?
The quality of the screws
The strength of the screw
The pre-tightening torque of the screw
The fatigue strength of the screw The material of the screw is unqualified, the heat treatment is unqualified, the product manufacturing process is unqualified,
The unreasonable selection of stainless steel screws will directly affect the harsh environment of use.

When these premises are standardized, most cases of stainless steel screw fracture are caused by loosening.

Because the situation of loosening and breaking of stainless steel screws is roughly the same as that of fatigue fracture, we can always find the reason from the fatigue strength.

What are the reasons for the fracture of stainless steel screws? - Stainless steel screws usually refer to steel screws that have the ability to resist corrosion from air, water, acid, alkali salt or other media.

How to choose the material when producing stainless steel screws?
The manufacture of stainless steel screws usually starts with the purchase of threaded wires, but for screws made of stainless steel, please purchase threaded wires of the same specifications and models first.

You also need to determine which type of stainless steel screws to produce.

Examples include stainless steel hexagon socket screws, grade 4.8 hexagon socket screws, grade 8.8 hexagon socket screws, and grade 12.9 hexagon socket screws.

These determine the thread material, whether to use iron or stainless steel, and determine the strength of carbon steel.

Then order the mold of the hexagon socket screw, start the machine head, scrape the thread, and then screw the hexagon socket screw into the stopper.

The hexagon socket screws made of stainless steel need to be washed and dried.

Certain passivating agents can passivate to increase the salt spray time.

Some hexagonal iron screws must be electroplated first, and then electroplating.

This is because customer requirements are put together and electroplated in different colors.

How to choose the material when producing stainless steel screws? - First, consider the mechanical properties of screw fasteners, especially the requirements of strength grade and tensile strength.

What is the difference between stainless steel screws and carbon steel screws?
Stainless steel screws and carbon steel screws are common screw fasteners, and they are also used in a lot of screw fasteners.

We know that stainless steel screws and carbon steel screws have their own characteristics.

STARWDH News Stainless steel screws and carbon steel screws are common screw fasteners, and they are also used in a lot of screw fasteners.

The screw is the use of the object’s beveled circular rotation and friction of physics and mathematical principles, step by step fastening tools. Screw is the general term of fasteners, the daily colloquial language.

Screw for the daily life of indispensable industrial needs of supplies: such as cameras, glasses, clocks, electronics and other use of small screws;

TV, electrical products, Musical Instruments, furniture, etc. So the screw manufacturer tells you how to reduce the loss of non-standard screws?

Screw manufacturers generally all screw out of the shape and color of the tail tip to judge, the tail pointed, with a little black is appropriate, in this case for the screw stability, the waste of material is very little, the service life of the tooth plate than the waste of iron s**t tooth plate more than 1/3 of the service life.

How do screw manufacturers reduce the loss of non-standard screw thread? The screw is the use of the object's beveled circular rotation and friction of physics and mathematical principles, step by step fastening tools. Screw is the general term of fasteners, the daily colloquial language.

Stainless steel screws usually refer to steel screws with resistance to corrosion of air, water, acid, alkali, salt or other media.

Stainless steel screws are generally not easy to rust, durable, can be used in environmental protection equipment, medical equipment, communication equipment and other fields.

Testing methods for stainless steel screws? - STARWDH Stainless steel screws are generally not easy to rust, durable, can be used in environmental protection equipment, medical equipment,.

Product|Fasteners| Quality assurance | OEM/ODM welcome - STARWDH Manufacturer and supplier.Fastener products: Bolts, Nuts, Screws, Washers, Thread rods. STARWDH welcome the customization of products.

How to choose a flat washer or a spring washer for the bolts?
In the process of bolt use, flat washer and spring washer each play an indispensable role, so how to choose?
How to choose a flat washer?

Flat washers are used as a part to prevent bolts and nuts from locking. Flat washers are used where fasteners are used. How to choose suitable flat washers? Flat washer is a kind of flat washer, which mainly serves to increase and tighten the contact area between screws and some large equipment. When using flat washers, it is often suitable for nuts and nuts to cooperate with each other. It must have the necessary important characteristics within the most effective sealing time:

1. In the case of a harsh environment, the flat gasket should be sealed. When a certain temperature and pressure are in operation, it is not easy to leak.

2. When the flat gasket is connected to the contact surface, it is necessary to better ensure the sealing performance, just like the good effect.

3. Under the influence of temperature when the flat washer receives pressure, the anti-wrinkle ability should be better, otherwise the screw will be damaged and hard gas leakage will occur.

4. Don't get infected when using flat washers.

5. The use of flat washers can be easily disassembled. This is the biggest effect of choosing flat washers.

6. Remember to ensure normal use at the relative temperature when using flat washers.

In order to better use flat washers, when choosing flat washers, try to choose flat washers made of anti-rust and anti-corrosion materials. This not only saves time and effort, but also the effect of flat washers can be played well.

When used with bolts and nuts, the selection criteria for flat washers:
1. When choosing flat gasket materials, you should pay attention to the problem of electrochemical corrosion when different metals are in contact. The material of the flat washer is generally the same as that of the connected parts, usually steel, alloy steel, stainless steel, aluminum alloy, etc. When electrical conductivity is required, copper and copper alloys can be used.

2. The inner diameter of the flat washer should be selected according to the larger value of the thread or screw diameter. The outer diameter of the connected material is soft (such as composite material) or matched with the spring washer. The larger value should be selected.

3. When choosing to place the W washer under the bolt or screw head, in order to avoid interference between the fillet under the head and the washer, a flat washer with a chamfered inner hole can be used.

4. Steel washers should be used for important bolts with larger diameters or in order to increase the ability to resist extrusion. Steel washers should be used for tension bolts or tension-shear composite bolt connections.

5. Special gaskets are used in special requirements. For electrical conductivity, copper gaskets can be used; sealing gaskets with air tightness requirements can be used.

The role of flat washers:
1. Increase the contact area between the screw and the machine.

2. Eliminate the damage to the surface of the machine when the spring pad is unloading the screw. It must be: spring washer + flat washer, the flat washer is next to the surface of the machine, and the spring is between the flat washer and the nut. The flat washer is to increase the force surface of the screw. In order to prevent the screws from loosening, the spring pads play a certain amount of buffer protection when stressed. Although flat washers can be used as sacrificial pads.

3. But more often it is used as a supplementary pad or flat pressure pad.

advantage:
①By increasing the contact area, parts can be protected from damage;

②By increasing the contact area, reducing the pressure between the nut and the device, so as to play a protective role.

Disadvantages:
①The flat washer cannot play the role of earthquake resistance;

②The flat washer does not prevent loosening.

The role of spring washers
1. The function of the spring washer is that after the nut is tightened, the spring washer gives the nut an elastic force to tighten the nut to make it not easy to fall off. The basic function of the spring is to give a force to the nut after the nut is tightened to increase the friction between the nut and the bolt.

2. Spring washers generally do not need flat washers (except for protecting the surface of the fastener and the mounting surface, consider using flat washers and spring washers).

3. Flat washers are generally used in connecting parts, one of which is soft and the other is hard and brittle. Its main function is to increase the contact area, disperse the pressure, and prevent the soft texture from being crushed.

advantage:
①The spring washer has a good anti-loosening effect;

②The spring washer has good seismic effect;

③Low manufacturing cost;

④The installation is very convenient.

Disadvantages:
Spring washers are greatly affected by the material and process. If the material is not good, the heat treatment is not well grasped, or other processes are not in place, it is easy to crack. Therefore, you must choose a reliable manufacturer.

When to use flat washers and when to use spring washers?

1. Under normal circumstances, only flat washers can be used when the load is relatively small and the vibration load is not applied.

2. In the case of relatively large load and vibration load, a combination of flat washers and elastic washers must be used.

3. Spring washers are basically not used alone, they are all used in combination.

In the actual use process, due to the different emphasis of flat washers and spring washers, in many occasions they are used in conjunction with each other, so as to protect the parts, prevent the nut from loosening, and reduce the advantages of vibration, which is great s Choice.

Product|Fasteners| Quality assurance | OEM/ODM welcome - STARWDH Manufacturer and supplier.Fastener products: Bolts, Nuts, Screws, Washers, Thread rods. STARWDH welcome the customization of products.

Tensile properties of high strength bolts
The practical application is indeed such, a small screw, its role is not to be ignored.

Especially for the installation and use of some high-strength bolts, there are strict requirements for the tensile strength of bolts.

When we calculate the tensile performance level of bolts, we should multiply the cross-sectional area of bolts by its original design value, and then judge whether it is within the allowable range.

If large equipment is to be secured, high-strength bolts and a cement foundation must be poured into an integral part to prevent the heavy machinery from working to produce strong vibration.
https://www.starwdh.com/tensile-properties-of-high-strength-bolts/.html

Tensile properties of high strength bolts - STARWDH Especially for the installation and use of some high-strength bolts, there are strict requirements for the tensile strength of bolts. When we calculate the tensile performance level of bolts, we should multiply the cross-sectional area of bolts by its original design value, and then judge whether it...

Environmental protection status of bolt industry
Bolt: Machine part, cylindrical threaded fastener with nut. A type of fastener consisting of a head and a screw (cylindrical body with external thread) to be fitted with a nut for fastening two parts with through holes.

This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection belongs to the detachable connection.

Environmental protection status of bolt industry - STARWDH Bolt: Machine part, cylindrical threaded fastener with nut. A type of fastener consisting of a head and a screw (cylindrical body with external thread) to be fitted with a nut for fastening two parts with through holes.

Hex nuts are one of the most common nuts available and are used with anchors, bolts, screws, studs, threaded rods and on any other fastener that has machine screw threads. Hex is short for hexagon, which means they have six sides. Hex nuts are also known as: finished hex nuts, hex full nuts.
Like metric nuts, m3 nut, m12 nut, 10mm nut, m16 nut, m14 nut, m20 nut, m8 nuts, m24 nut, etc., they are already in the warehouse and ready to ship.
Grade/Class: grade 8 nuts, 8.8 nut, f594c nut, 10.9 nut, etc.,
Consultation email: [email protected]

Although there has been some economic downturn, the global demand for bolts has been on the rise.

More and more bolt products produced by new materials are concerned and applied by some high-tech enterprises.

Under the premise of lightweight, standardization and high quality quantification of bolt materials, the traditional bolt production technology has faced challenges.

The bolt production of existing materials does not have any problems in the manufacturing process. No matter it is foreign or domestic, there is not much difference in the grasp of the bolt production technology.

The importance of bolt surface treatment - STARWDH The bolt production of existing materials does not have any problems in the manufacturing process.

Hastelloy C-276 Fastener is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments.
Hastelloy C-276 Fastener has a excellent resistance to localized corrosion, stress corrosion cracking, oxidizing and reducing media, which is suit for a wide variety of chemical process environments, including ferric and cupric chlorides, hot contaminated media (organic and inorganic), formic and acetic acids, seawater and brine solutions. Meanwhile, Hastelloy C276 is the few kinds of material that can withstand the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide.
Inquiry at [email protected] or visiting us at www.starwdh.com

Bugle head self drilling screw, usually used in gypsum board, wood, and plywood to steel applications.
STARWDH offers a variety of sizes in the warehouse. Ask us for the correct matching size that is convenient for your application.
drilling screws tapping screws
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www.starwdh.com

Hastelloy C-276 Fastener
Hastelloy C-276 Fastener is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments.
Hastelloy C-276 Fastener has a excellent resistance to localized corrosion, stress corrosion cracking, oxidizing and reducing media, which is suit for a wide variety of chemical process environments, including ferric and cupric chlorides, hot contaminated media (organic and inorganic), formic and acetic acids, seawater and brine solutions. Meanwhile, Hastelloy C276 is the few kinds of material that can withstand the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide.

www.starwdh.com
[email protected]

Common problems in use of stainless steel bolts

Common problems in use of stainless steel bolts - STARWDH Many customers in the purchase of inappropriate stainless steel screws or improper use of the case, will produce the phenomenon of screw loosening.