High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers
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Product Highlights
- Bi-Metal Construction: Carbon steel core with stainless steel exterior for strength and corrosion resistance.
- Customized Surface Treatment: Options include Zinc Plated, Ruspert, Dacromet, and other customized coatings.
- Wide Size Range: Diameter 2.9mm-10mm and length up to 400mm, with non-standard sizes available.
- Ideal for Solar Applications: Perfect for securing rails, brackets, and frames in solar power systems and roofing.
- High Torque Resistance: Heat-treated for toughness, resisting stripping and breaking under high torque.
- Multiple Coating Standards: Class 2, 3, and 4 options with salt spray resistance up to 2000 hours.
- Full Customization Support: Accepts ODM/OEM, flexible customization from designs or samples.
- Multiple Certifications: ISO9001, BSCI, and compliance with ANSI, DIN, GB, GOST, JIS standards.
Product Attributes
- Customization
- Available
- Drive Type
- Hex
- Grade
- Bi Metal
- Model NO.
- UN-02
- Material
- Stainless Steel + Carbon Steel
- Standard
- DIN, GB, ANSI, BSW, JIS, GOST
- Drill Point
- Drilling Screws
- Surface Treatment
- Zinc Plated, Ruspert, Dacromet, Customized
- Delivery
- Sea Freight, Air, Train, Express
- Certification
- Eta, ISO9001, BSCI
- Sample
- Yes
- ODM/OEM
- Accept
- Type
- Hexagon Head With Flange
- Groove
- Hexagon
- Head Style
- Hexagonal
- Connection
- Drilling
- Transport Package
- Carton Boxes + Pallets
- Specification
- 4.8-16x25
- Trademark
- UN
- Origin
- China
- HS Code
- 7318151001
- Production Capacity
- 700tons/Month
Shipping
- Shipping Cost:
- Contact the supplier about freight and estimated delivery time.
Online Trading Protection
- Payment Guarantee
-
Platform-protected payments with refund support for eligible order issues.
- Platform Logistics
- Clearer shipment tracking with platform-supported logistics.
- Inspection Service
- Optional pre-shipment inspection for quality and quantity checks.
- After-Sales & Dispute Handling
- Platform-assisted dispute resolution, including refunds or returns when applicable.
Only orders placed and paid through Made-in-China.com Secured Trading are eligible for payment protection and the corresponding platform services.
Product Images of High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers
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High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers -
High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers -
High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers -
High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers -
High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers -
High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers -
High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers
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Product Description
| Union Hex Head With Flange Stainless Steel Self-Drilling Screw |
| Name |
| Bi-metal Self-Drilling Screw |
| Material |
| Bi-metal |
| Surface Treatment |
| Customized Coating |
| Size |
| ST3.5-ST6.3 or non-standard as request&design |
| Length |
| Diameter2.9mm-10mm, max length up to 400mm or non-standard as request&design |
| Quality |
| Sample Testing Or Third-party Inspection |
| Price |
| Customized Production With Big Discount |
| Lead Time |
| Based on quantity |
Bi-metal screws sometimes referred to as twin-fast screws, are made of two separate metals joined together. They have a carbon steel core and stainless steel exterior. Carbon steel provides strength while stainless steel provides corrosion resistance. This makes bi-metal screws ideal for use in outdoor applications like solar power systems and roofing.
Bi-metal screws are hardened through heat treatment to maximize their toughness and resistance to stripping and breaking. They can withstand high torque and grip well into materials like wood and metal. Their unique composition gives them excellent resistance to rust and corrosion compared to regular carbon steel screws.
Uses for Solar Mounting
For solar panel installations, bi-metal screws are commonly used to secure:
- Rails and brackets to the roof surface
- Frames that hold panels together
- Junction boxes and conduits
- Panels to racks and frames
Their threading grips tightly, while their stainless steel exteriors eliminate rust stains on the roofing materials. Bi-metal screws also hold up well to thermal expansion and contraction of the roof.
The combination of strength and corrosion resistance makes bi-metal screws well-suited for roofing needs. They help roofs stand up to sun, rain, snow, and wind. Their versatility allows use with many roofing materials like asphalt shingles, slate, metal sheeting, and more.
Corrosion Resistance
Stainless steel combined with a carbon steel core gives bi-metal screws excellent resistance to rust and corrosion. The stainless steel exterior protects against oxidation, allowing long-term outdoor use.
Bi-Metal Coating
| Surface Treatment | ||||
| Types | Class2 | Class3 | Class4 | Dacromet |
| Coating Material | Mechanical Galvanized | Mechanical Galvanized | Mechanical Galvanized | Zinc and Aluminum |
| Salt Spray Test | 500Hours | 1000Hours | 2000Hours | 1000Hours |
Report Result
About the Supplier
This supplier has been audited by SGS. Verify the report on the official SGS website with ID "QIP-ASR2432432". Items marked "
" are certified.
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Company Profile
Established in the early 2000s, Union Hardware began as a manufacturer and distributor of fasteners and hardware tools. In 2023, we officially consolidated into a globally focused professional hardware exporter. Our expansive product range includes photovoltaic fasteners, stainless steel fasteners, highly corrosion-resistant carbon steel fasteners, and a wide selection of hand tools (Mechanic Tools, Fastening Tools, Measuring Tools, Storage Tools, Tool Sets, PTA Kits, etc. ). Our hardware solutions are trusted across the construction, machinery, automotive, and DIY sectors. With decades of expertise producing durable, reliable products, over 85% of our goods are exported internationally.
Strategically located in Hangzhou Xiaoshan Industrial Zone, we are part of a vibrant manufacturing hub that promotes clustering effects and supply chain efficiency. Our modern facilities and proximity to Shanghai Port allow for seamless production, inventory management, and timely delivery to global markets. Leveraging our hard-won reputation for integrity, dependability, and unparalleled quality, Union Hardware continues pioneering hardware distribution. We remain committed to delivering ideal products, services, and solutions at competitive costs for trade specialists and DIYers worldwide.
About Our Factory & Business Background
-
Business Type
- Trading Company
- Address
- Room 401-1, No.58, Xiangshan Road, Wenyan Street, Xiaoshan, Hangzhou, Zhejiang, China
-
Plant Area
- 100 square meters
-
Number of Employees
- 4
-
Terms of Payment
- LC, T/T, D/P, PayPal, Western Union, Small-amount payment
-
International Commercial Terms(Incoterms)
- FOB, CIF, CFR, EXW
-
Average Lead Time
-
Peak Season Lead Time: within 15 workdays, one month, 1-3 months
Off Season Lead Time: within 15 workdays, one month, 1-3 months -
Nearest Port
- Shanghai Port, Ningbo Port
-
Minimum Order Quantity
- 1000 pcs
-
Supply Chain Partners
- 56
Our Production Capability & Technical Expertise
-
Main Products
- Bit Holders, Bits, Sockets, Torque Wrench, Ratchet, Hex Keys, Tool Set, Pta Sets, Bi-Metal Screws, Stainless Steel Fasteners
-
Customization Options
- Full Customization, Minor Customization, Flexible customization, Customization from Designs, Customization from Samples
-
ODM Service Available
- Yes
-
R&D Engineers
- 1 people
Our Industry Experience & Global Business Record
-
Year of Establishment
- 2023-08-03
-
Export Year
- 1 year
-
Main Markets
- Europe, Africa, Domestic
-
Repeat Buyers Choice
- 50%~80%
-
Number of Foreign Trading Staff
- 2
-
Overseas Agent/Branch
- No
-
New Products Launched in Last year
- No
Our Certifications, Standards & Industry Recognition
-
Cooperated with Fortune 500
- No
FAQ
- What materials are used for the bi-metal screws?
- They are made of a carbon steel core for strength and a stainless steel exterior for corrosion resistance.
- What surface treatment options are available?
- Options include Zinc Plated, Ruspert, Dacromet, and customized coatings based on Class 2, 3, or 4 standards.
- Can the size and dimensions be customized?
- Yes, we offer standard sizes from ST3.5 to ST6.3 and can produce non-standard sizes as per your request and design.
- What is the minimum order quantity?
- The minimum order quantity is 1000 pieces.
- What are the lead times for production?
- Lead time varies by quantity and season, typically ranging from within 15 workdays to 1-3 months.
- Do you accept OEM and ODM orders?
- Yes, we accept full customization, minor customization, and flexible customization from designs or samples.
- What payment terms do you offer?
- We accept LC, T/T, D/P, PayPal, Western Union, and small-amount payments.
- Are samples available for testing?
- Yes, samples are available for testing or third-party inspection before bulk production.
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