Strip-Resistant Screws for Sheet Metal And Locking Nuts

What do you know about the locking method of industrial structure connection to prevent loosening?

Loosening of threaded connection is a common form of failure; once the threaded connection is loosened, the torque and axial force attenuation are also larger after the attenuation of the axial force can't guarantee the reliable threaded connection, and even accompanied by the connecting part slipping and bolt fracture.

On the one hand, the measures for loosening a threaded connection are to increase the assembly torque and preload through the design and effective resistance to external load; on the other hand, to use effective anti-loosening measures to improve the safety coefficient of the connecting part. Many anti-loosening methods can be used, such as glue anti-loosening, part structure anti-loosening, destroying the threaded sub anti-loosening, etc. Then what are the main ways to prevent loosening of part structure anti-loosening?

High-Strength Metric Steel Serrated-Flange Hex Head Screws

Choose these steel screws for high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are about 10% stronger than medium-strength steel screws. Serrations under the head grip the material surface for mild vibration resistance, and the flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer. The black-oxide finish provides mild corrosion resistance in dry environments. Head height includes the flange.

These Class 8.8 screws are suitable for fastening most machinery and equipment. Serrations under the head grip the material surface for mild vibration resistance, and the flange distributes pressure where the screw meets the surface, eliminating the need for a separate washer. The zinc plating provides corrosion resistance in wet environments. Dimensions meet DIN 6921 specifications.

Hexagonal flange hexagonal bolt head down anti-slip teeth and gasket anti-slip teeth is a kind of anti-loosening design; the principle is that the gasket anti-slip teeth are embedded in the aluminum alloy of the connected parts, and the bolt head down and the gasket rotational friction occurs. The anti-slip teeth under the bolt head and the anti-slip teeth of the gasket should be higher, and the hardness of the anti-slip teeth of the gasket should be at least 40HV higher than that of the connected part to ensure that the anti-slip teeth of the gasket are effectively embedded in the connected part. This method increases the friction between the anti-slip teeth under the head of the bolt and the gasket so that loosening does not quickly occur after the threaded connection. It should be noted that the hardness of the bolt and the gasket should be close to each other; when the deviation is significant, it will lead to the anti-slip teeth under the head of the bolt embedded in the gasket, and the friction surface occurs between the anti-slip teeth of the gasket and the connected part, resulting in the gasket following the turn and the connection abnormality.

DIN7500 Hexalobular Socket Pan Head Thread Rolling Screws

Metric Thread-Forming Screws for Soft Metal

These screws have a triangular shank that presses tightly as it forms threads, so screws resist loosening in soft metals such as brass, aluminum, and copper.

Screws with a Torx-Plus drive allow you to apply extra force with less slippage or damage to the recess.

Screws that meet DIN 7500 adhere to international standards for thread-forming screw dimensions.

18-8 Stainless Steel Rounded Head Blunt Screws for Sheet Metal

Super-Corrosion-Resistant 316 Stainless Steel Rounded Head Blunt Screws for Sheet Metal

High-Strength 410 Stainless Steel Phillips Flat Head Screws for Sheet Metal

Hex Head Blunt Screws for Sheet Metal

Strip-Resistant Screws for Sheet Metal

Stainless Steel Hex Head Thread-Cutting Screws for Metal

Steel Rounded Head Thread-Cutting Screws for Metal

Thread-Forming Screws for Metal

Metric Thread-Forming Screws for Soft Metal are used for tightening on light metal alloys, which generally have low hardness and strength. Compared to regular bolts, Metric Thread-Forming Screws for Soft Metal have a triangular shape in terms of the cross-section of the bolt, which allows the thread to be forced through the base of the light hole and then tightened when mating with the light hole. This thread is usually an interference fit when connecting, which has better anti-loosening performance and saves the cost of prefabricated threaded holes.

Serrated Flange Nuts

Serrations bite into material for mild vibration resistance, while the flange eliminates the need for a separate washer. These nuts are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. You can use them again and again without sacrificing strength. However, the serrations may mar the surface of your material. They are also known as collar nuts.

Medium-Strength Steel Serrated Flange Nuts

Rated Grade 5, Grade F, or Class 8, these nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Zinc-Yellow-Chromate-Plated Steel—With a more durable finish than clear zinc plating, these nuts are suitable for most wet and outdoor environments. However, they won't withstand the harsh chemicals that stainless steel can.

Black-Oxide Steel—Typically chosen for their appearance, these nuts have a dark, matte coating that creates a finished look. They offer minimal corrosion resistance, so they're best for dry environments.

Steel—Best for dry environments since moisture will cause these nuts to rust.

The bearing surface of Serrated Flange Nuts is uniformly distributed with a certain angle of “serrated” or arc-shaped teeth, and the compression force generated during the tightening process causes the teeth to be embedded in the surface of the connecting surface, thus increasing the friction of the bearing surface and playing a good role in preventing loosening. Usually, when the nut tightening method is the torque corner method, the final tightening torque compared to the non-toothed nut, a significant increase in the tightening torque is high, making the loosening torque also high, thus effectively preventing loosening.

Nylon-Insert Flange Nuts

A nylon insert grips the screw for a stronger hold than a serrated flange without damaging threads or marring the surface of your material. However, the insert may become brittle if exposed to high temperatures. These nuts have a flange that distributes pressure evenly across the mounting surface, so you don't need a separate washer. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. You can reuse them a handful of times, but their holding power will decrease with each use. They are also known as collar nuts.

Medium-Strength Steel Nylon-Insert Flange Nuts

Rated Grade 5, Grade F, or Class 8,10, these nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

High-Strength Steel Nylon-Insert Flange Nuts

Rated Grade 8, Grade G, or Class 10, these are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten valves, pumps, and motor components. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Nylon-insert flange Nuts are a prevalent type of self-locking nut with many applications. The structure is the nylon ring embedded in the head of the nut. Its working principle is a non-metallic insert nut in the screw, and the bolt threads will be naturally extruded in the nylon ring into a thread so that it and the bolt threads form a close fit and in the nylon elasticity under the action of frictional resistance, to achieve the purpose of anti-loosening. Nylon-Insert Flange Nuts screwing torque can not be too high, too high will lead to torque converted into a preload value is reduced, can not be effectively clamped. It cannot be clamped effectively. Nylon inserts as engineering plastics, compared to metal, the hardness is softer, therefore, the screw-in torque is easier to control, tightening torque in the nylon inserts will not consume too much.

Spring-Stop Locknuts

These locknuts withstand heavy vibration, similar to distorted-thread nuts, and they can be used repeatedly. The prongs at the top bend when tightened to create tension for a secure hold. As you remove the locknut, the prongs spring back to their original shape, so you can install the nut again without losing holding power.

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these locknuts are about half as strong as medium-strength steel nuts. Use them with screws that have a similar strength rating to avoid stripping threads during installation.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

Flex-Top Locknuts for Heavy Vibration

The top section of these nuts expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. They're often used in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Steel

These locknuts have equivalent strength to Grade 8 and Class 10 steel nuts. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

The working principle of Spring-Stop Locknuts is to achieve the purpose of anti-loosening through the amount of deformation of the threaded bottom hole or the amount of deformation of the threaded teeth to produce an interference fit relationship between the threads when mating with the bolts, thus increasing the friction between the threads. Compared with nylon insert self-locking nuts, Spring-Stop Locknuts are more heat resistant and, therefore, more suitable for use in higher temperatures and larger changes in the connection position to prevent loosening.

Distorted-Thread Flange Nuts

The strongest hold of all the flange nuts we offer, these have irregularly shaped threads that grip the screw to resist loosening. The threads prevent the nut from backing out due to high vibration but also increase the effort to install and remove. To get these nuts off, you may need special tools, such as an impact wrench or propane torch, so they are not reusable. Nuts have a flange that evenly distributes pressure across the mounting surface without a separate washer. They are ideal for securing screws in oversized or irregularly shaped holes since the flange covers a larger area than standard nuts. They are also known as collar nuts.

Medium-Strength Steel

Rated Grade 5, Grade F, or Class 8, these nuts are your go-to for fastening most machinery and equipment. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

High-Strength Steel Distorted-Thread Flange Nuts

Rated Grade 8, Grade G, or Class 10, these are about 25% stronger than medium-strength steel nuts. They are commonly used to fasten valves, pumps, and motor components. To avoid stripped threads during installation, make sure your screw has a comparable strength rating.

Distorted-Thread Flange Nuts have an innovative self-locking female thread profile with a unique 30° wedge-shaped bevel at the thread's root. Due to the change in the angle of the tooth shape, the normal force generated on the contact surface between the threads forms an angle of 60° with the bolt axis, which allows the axial clamping force to be transmitted to the threaded contact area of the bolt and the nut to generate a much greater friction force than ordinary threads, thus effectively improving the anti-loosening performance.

Flex-Top Locknuts for Heavy Vibration

The top section of these nuts expands to grip the screw on all sides for a stronger hold than both nylon-insert and distorted-thread locknuts. They're often used in equipment with constant, vigorous vibration, such as engines. These locknuts are reusable a handful of times, but the holding power decreases with each use.

Locknuts with External-Tooth Lock Washer

To save on assembly time, these locknuts combine a hex nut with a free-spinning lock washer so that you can twist them into place by hand. Once the nut is against your material surface, tighten it with a wrench or socket to get the teeth to bite. Although these nuts install more quickly than nylon-insert locknuts, they don't hold up as well against vibration and can mar your material. As long as the washer stays intact, you can reuse them. You are also known as Keps and K-lock nuts.

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