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Author: Site Editor Publish Time: 2025-07-23 Origin: Site
Understanding bi metal screw specifications is very important for people in construction or industry. You need these screws to keep things safe and strong in tough places. Bi metal screws have stainless steel heads and threads that do not rust and stay strong. The hard carbon steel drill point lets you connect things fast, so you work better. Jiaxing Haina Fastener Co., Ltd. makes good fasteners that people trust for building jobs, so you always have the right tools.
Bi-metal screws have a strong carbon steel core. They also have a stainless steel body that does not rust. This makes them great for hard and outdoor work.
Picking the right size, head type, and rust protection is important. It helps your screws hold things tight and last longer in bad weather.
Self-drilling bi-metal screws save time because they drill and fasten at once. They are great for metal roofs and building jobs.
Bi-metal screws follow strict world rules. This means you can trust their strength, safety, and how long they last.
Using the right tools and ways to install stops damage. It also helps your fasteners last longer and keeps your project safe.
Sometimes, you need a fastener that is strong and tough. A bi-metal screw helps with this. It is made from two metals. The inside is carbon steel, which gives it strength for big jobs. The outside is stainless steel, so it does not rust or get damaged by water or chemicals. You can use bi-metal screws where other fasteners might not work. They are good for marine, industrial, or outdoor building projects.
Tip: Picking a bi metal screw means you get both strength and protection together.
Bi-metal screws are special because of how they are made and how they work. Here are some main things that make them different:
They use two materials: a strong carbon steel core and a stainless steel outside that stops rust.
They are very strong, so you can use them for heavy things and tough jobs.
They last a long time, so you do not need to fix or change them often.
You can use them with metal, wood, or other materials.
They save money because you get good rust protection and a strong core for less.
New ideas have made bi-metal screws even better. The Ultra S.S. Anti-Corrosion Screw uses a new way to make it. This way does not need welding and makes screws faster. It also costs less, up to 50% cheaper, and is better for the planet. These screws last longer and do not rust for up to 30 years, even in hard places like near the sea or in solar projects.
Property | Ultra S.S. Anti-Corrosion Screw | Conventional Bi-metal Screws | Stainless Steel SUS 410 |
|---|---|---|---|
Surface Hardness (HV) | 550-650 | 210-250 | 561-578 |
Core Hardness (HV) | 520-550 | N/A | 561-578 |
Tensile Strength (kgf/cm²) | 173 | 70.7 | 145-147 |
Corrosion Resistance (hours) | Over 3,000 | 240-1,000 (with treatment) | Below 50 |
Acid Rain Resistance (cycles) | Over 30 | N/A | Below 5 |
You get better results with the right materials and structure. The core is hardened carbon steel, often called SUS420. This makes the drill point strong and helps it go through tough stuff. The body is stainless steel, like SUS304 or SUS316. This stops rust and keeps the screw safe from water. Using two metals lets you use the screw in hard places, like near the sea or in factories.
The way these screws are made uses new technology. Tests like Vickers digital hardness, torque, and tensile tests check how strong the screw is. Salt spray tests show how well it fights rust. 3D tools make sure every screw is the right size. Surface coatings like zinc plating or Ruspert help stop rust even more. This makes the screw last longer in tough places.
You must pick the right size and diameter for your job. Bi-metal screws come in sizes from #10 to #14. Their lengths are between 19 mm and 60 mm. For example, a 5.5/6x25 mm screw works for sheet metal or steel. These sizes fit most building and factory jobs, so you can find what you need.
Standard diameters: #10, #12, #14
Lengths: 19 mm, 25 mm, 32 mm, 38 mm, 50 mm, 60 mm
Example: 5.5/6x25 mm screw as3566
You can pick from many head and drive types. The right choice makes your work faster and safer. Here is a table with the most common types:
Head Type | Description and Application | Drive Types Commonly Used |
|---|---|---|
Flat Head (conical, 82°-100°) | Sits flat in countersunk holes; used in metal parts and machines | Phillips, Torx, Hex socket |
Wafer Head | Low and flat; good for thin metal and panels | Phillips |
Pancake Head | Very flat; used where space is tight, like ducts | Phillips |
Self-Drilling Flat Head | Drills and fastens at once; good for metal jobs | Phillips, Hex socket |
Hex Head | Six sides for strong turning; used in big machines | Hex socket, wrench drive |
Pan Head | Round top spreads force; used in metal work | Phillips, Slotted |
Truss Head | Wide and flat; used for sheet metal and planes | Phillips, Slotted |
Hex-head bi-metal screws are common in HVAC and heavy jobs. Phillips, Torx, and hex socket drives are easy to use and hold tight.
You get better results when you match the thread and flute to your material. Self-drilling screws have a tip like a drill, so you do not need to make a hole first. This saves time and makes work easier. The threads are made to be strong and hold tight, so they do not come loose. Some screws as3566 have wings or ribs for thick steel. These help make the hole bigger and keep the screw in place.
Thread shape, like how deep or wide it is, helps the screw as3566 cut and hold in steel. Big, deep threads make it easier to go into thick steel. Drill-like tips let the screw as3566 make its own hole, which is fast and easy. Longer drill points can go through thicker steel, but you may need more force. Bi-metal screws have a stainless steel body and a hard drill point, so they fight rust and go through tough stuff.
You need corrosion resistance for outdoor or tough jobs. The stainless steel body of a bi-metal screw as3566 keeps out rust, chemicals, and bad weather. Coatings like zinc or Ruspert add more protection. Salt spray tests show some screws as3566 can last up to 2000 hours without rusting, depending on the coating. This means you can trust these screws as3566 for long jobs in places like the sea, factories, or solar panels.
Tip: Always check the corrosion resistance rating of your screw as3566 before you start. This keeps your project safe and strong for a long time.
You should always pick screws as3566 that meet world standards. These rules make sure the screws are safe and work well. Here are some important standards and certifications for bi-metal screws:
Aspect | Description |
|---|---|
Standard Name | ISO 3506-1 |
Scope | Rules for strong, rust-proof stainless steel bolts, screws, and nuts |
Stainless Steel Types Covered | Austenitic (like 304, 316), Martensitic (like 410), Duplex (like 2205) |
Key Requirements | What metals are used, how strong they are, how they look, and markings |
Testing Methods | Pulling tests, hardness tests, rust tests |
Quality Assurance | Sets the lowest strength, smoothness, defect limits, and clear markings |
Application Areas | Building, cars, chemical plants |
Purpose | Makes sure fasteners like bi-metal screws resist rust and work well |
You also see certifications like ISO 9001, ICC, SGS, and ETA. These show the maker follows strict rules and meets world standards. When you buy a screw as3566 from Jiaxing Haina Fastener Co., Ltd., you get screws that pass all these tests. This helps you feel sure your project is safe and meets all the rules.
Note: Always check that your screw as3566 meets the as3566 standard and other needed certifications before you use it. This step helps you avoid problems and keeps your project strong for a long time.
When you choose bi metal screws, you find several types designed for different jobs. Each type gives you unique features and benefits. You can see the main differences in the table below:
Screw Type | Key Functional Difference | Typical Applications |
|---|---|---|
Self-Tapping | Needs a predrilled hole; forms threads as you drive it | Fastening thin metal to wood, metal, or plastic; HVAC, construction, automotive |
Self-Drilling | Drills its own hole and taps threads at the same time | Thicker or stronger materials; metal roofing, cladding, steel framing, general construction |
Specialty Bi-Metal | Custom features for unique needs | Specialized industrial or construction projects |
You use self-drilling bi-metal screws when you want to save time and effort. These screws have a drill bit-shaped tip. You do not need to make a hole first. The screw drills and fastens in one step. This type works well for metal roofing, cladding, steel framing, and general construction. You find them in hex head, pan head, and flat head styles. The stainless steel body resists rust, while the hardened carbon steel tip drills through tough materials. You often see these screws in HVAC, automotive, and electrical work.
Tip: Self-drilling bi-metal screws come in different drill point sizes. Choose the right size for the thickness of your material.
You use self-tapping bi-metal screws when you need to fasten thin metal, plastic, or wood. These screws require a predrilled hole. As you drive the screw, it forms its own threads. You see this type in HVAC, construction, and automotive industries. The screw holds parts together tightly and resists corrosion. You find point styles like Type AB, which has a pencil-like tip. This type works best for thin gauge sheet metal, aluminum, and plastic housings.
Self-tapping screws cannot drill holes.
They create strong threads in soft or thin materials.
You may need specialty bi-metal screws for unique or demanding projects. These screws offer custom features, such as special coatings or unique head shapes. You use them in projects that need extra strength, weather resistance, or special installation methods. Specialty types help you solve problems in challenging environments, such as marine or solar panel installations.
Note: Always match the screw type to your project needs for the best results.
You use bi-metal screws for many building and factory jobs. These screws have a carbon steel center and a stainless steel outside. This makes them strong and stops rust. You use them for roofs, wall panels, and big building projects. In factories, on boats, and in electrical work, these screws work well.
You pick screw as3566 for roofs and wall panels because the stainless steel stops rust, even in bad weather.
You use screw as3566 on boats, where saltwater and wet air can hurt other fasteners.
You choose screw as3566 for factory work and electrical jobs because it is strong and does not break easily.
Bi-metal screws have a hard carbon steel tip joined to a stainless steel body. This makes them bend without breaking and keeps them from rusting. When you need to go through thick insulation, longer self-drilling screw as3566 helps with new building needs. The stainless steel layer helps stop heat from moving through, so buildings save energy. Extra coatings on screw as3566 help stop rust even more, so you can use them in hot or wet places.
Jiaxing Haina Fastener Co., Ltd. gives bi metal screws for big jobs all over the world. You see their screws in the Hong Kong-Zhuhai-Macao Bridge, Samsung’s Egypt factory, and the Temburong Marine Viaduct. These tough places show that screw as3566 is strong and lasts a long time in many jobs.
You need bi-metal screws for solar panels because these jobs need both strength and to last a long time. Solar panels are always in the sun, rain, and wind. The stainless steel body of screw as3566 stops rust, and the carbon steel tip holds tight to metal frames.
You use screw as3566 for solar panels for many reasons:
The as3566 standard makes sure each screw is strong and does not rust.
The self-drilling tip of screw as3566 saves time when you put in the screws.
Screw as3566 lasts a long time, so you do not need to fix things often, which is important for solar panels.
Jiaxing Haina Fastener Co., Ltd. makes bi-metal screws just for solar panels. Their screws, like hanger bolts and solar hooks, use the as3566 standard to work well outside. You can trust these screws to hold your solar panels for many years, even in hard weather.
Tip: Always pick screw as3566 with the right certification for your solar jobs. This keeps your project safe and working well for a long time.
When you start a project, you need to match the screw to your job. You must look at several factors to choose the right bi-metal screw. Each detail affects how well the screw works and how long it lasts.
Head style: Pick a head that spreads stress well. Hex washer heads work for heavy-duty jobs. Modified truss heads give a wider bearing surface.
Shank size: Thicker shanks give more strength. Use them for heavy-duty tasks.
Length: Match the screw length to the thickness of your materials. This ensures a secure grip.
Point type: Self-drilling tips come in sizes #2 to #5. Higher numbers drill through thicker metal.
Plating: The outer coating, such as zinc or ceramic, boosts corrosion resistance.
Material: Bi-metal screws use a carbon steel tip for drilling and a stainless steel body for rust protection.
Application factors: Think about the type of material, thickness, and exposure to weather or chemicals.
Other needs: Consider how many screws you need and if you want custom colors.
Tip: Always review your project’s needs before you select a screw. This step helps you avoid problems later.
You must consider the environment where you will use the screw. Humidity, temperature, and chemicals can affect metal fasteners. High temperatures and chemical exposure can speed up corrosion. Bi-metal screws resist these problems because they use stainless steel shanks and hardened steel tips. This design helps them keep their strength in tough places like marine or chemical plants. You can use them in saltwater, high humidity, or places with big temperature swings. Special coatings add even more protection, so your screws last longer in harsh conditions.
You need to check the load and the materials you plan to join. Bi-metal screws give you both strength and corrosion resistance. They work well with metal, wood, or composite panels. The carbon steel tip drills through tough materials, while the stainless steel body keeps the screw strong over time. You should match the screw’s size and type to the load it will carry. For heavy loads, pick a thicker shank and a longer screw. This ensures the screw holds tight and does not fail.
Material Type | Recommended Screw Feature | Reason |
|---|---|---|
Thin metal sheets | Fine threads, sharp tip | Easy penetration, tight hold |
Thick steel beams | Large drill point, thick shank | More strength, deeper reach |
Wood panels | Coarse threads, longer length | Better grip, secure fastening |
Remember: When you choose the right bi-metal screw, you get the best strength and performance for your applications.
When you compare bi-metal screws to traditional screws, you see clear differences in how they perform. Bi-metal screws use a hardened steel tip and a stainless steel shaft. This design lets you drill into tough materials while keeping the screw as3566 safe from rust. Traditional screws made from carbon steel can rust quickly in wet or salty places. Stainless steel screws resist rust but may not drill as well as a screw as3566.
You get better results with bi-metal screws in harsh environments. The as3566 standard ensures each screw as3566 meets strict rules for strength and corrosion resistance. You can use a screw as3566 on metal roofs, in factories, or near the sea. The stainless steel body resists pitting and weakening, even when exposed to chemicals or saltwater. You do not need to worry about the screw as3566 failing over time. This makes bi-metal screws the top choice for jobs that need both strength and protection.
Tip: Always check if your project needs the as3566 standard. This helps you pick the right screw as3566 for the job.
You might think bi-metal screws cost more at first. However, you save money over time. The as3566 standard gives you a screw as3566 that lasts much longer than traditional screws. In corrosive places, traditional screws often need replacing. Bi-metal screws, especially those with a 300 series stainless steel body, come with warranties that match or exceed the lifespan of metal roofing panels. This means you do not need to replace them as often.
You get more value from bi-metal screws because of their durability. The as3566 standard ensures each screw as3566 stands up to tough weather, chemicals, and heavy loads. You spend less on repairs and replacements. Over the life of your project, bi-metal screws help you save time and money.
Feature | Bi-Metal Screw as3566 | Traditional Screw |
|---|---|---|
Corrosion Resistance | Excellent (as3566) | Fair to Poor |
Drilling Ability | High | Varies |
Lifespan | 20+ years | 5-10 years |
Maintenance | Low | High |
Note: Choosing bi-metal screws with the as3566 standard gives you peace of mind and long-term savings.
You want your bi-metal screws to last and perform well. Follow these installation tips for bi-metal screws to get the best results:
Use a torque-adjustable screwgun. Set the speed to a maximum of 1800 RPM for large screws and 2500 RPM for smaller ones.
Choose the correct driver bit, such as a hex nut driver or Phillips bit, to fit the screw head.
Hold the screw straight and perpendicular to the work surface. This helps the screw seat properly.
Apply steady, even pressure during installation. Stop when the screw head sits snugly against the surface.
Control your speed. Avoid going too fast, which can burn the drill point or damage the screw.
Do not use impact drills. These can deform thin metal sheets.
Clean the surface before installation. Remove any rust, dust, or debris.
Keep proper spacing between screws. For aluminum, space screws at least three times the screw diameter apart and 1.5 times the diameter from the edge.
Make sure the unthreaded tip of the screw passes through the material before the threads engage.
Inspect your work after installation. Check for straightness, proper seating, and any damage.
Tip: Good installation practices prevent thread stripping, cracking, and early failure. You protect your project and extend the life of your fasteners.
You can avoid many problems by watching out for these common installation errors:
Overdriven screws compress washers too much. This can cause water to pool and lead to leaks.
Under driven screws do not hold panels tightly. This can cause panels to move or wear out early.
Screws installed at an angle do not seal well. Water can get in and cause rust or fastener failure.
Using the wrong screw type or one with poor corrosion resistance can lead to rust and screw back out.
Note: Always check your installation for proper alignment and tightness. Regular inspections help you catch issues early and keep your structure safe.
Knowing about bi metal screw specifications helps you keep things safe and working well.
Picking the right size and metal stops screws from getting loose or wearing out too soon.
Stainless steel or hardened steel screws do not rust easily and last a long time.
Checking your screws often keeps your projects safe.
When you pick a company to buy from, look for these things:
Good quality control
Quick shipping and enough stock
Easy-to-read test results and open production
If you have special needs, talk to experts or trusted companies like Jiaxing Haina Fastener Co., Ltd. to get the best outcome.
You get a carbon steel core for strength and a stainless steel body for corrosion resistance. This combination lets you use bi-metal screws in tough environments where regular screws might fail.
Yes, you can use bi-metal screws outdoors. The stainless steel body resists rust and weather damage. You can trust these screws for roofing, solar panels, and marine projects.
Check your material thickness and load requirements. Select a screw length that passes through both materials. Use the correct diameter for a secure fit. If unsure, consult the supplier’s size chart.
You do not need special tools. Use a standard screwgun or drill with the correct driver bit. Make sure you set the right speed and torque for best results.
Yes. Bi-metal screws from trusted suppliers like Jiaxing Haina Fastener Co., Ltd. meet international standards such as ISO 3506-1 and ISO 9001. You get reliable performance and peace of mind.
