As a result, we deliver factory-direct pricing, consistent corrosion resistance, and fast delivery. Similarly, this applies to all your rooftop, ground-mount, and solar tracker projects.

In addition, we produce a complete range of solar mounting fasteners in A2 (304) and A4 (316) stainless steel. Meanwhile, our product line covers hanger bolts, T-bolts, rail clamps, mid clamps, end clamps, bi-metal screws, flange nuts, and sealing washers. Therefore, EPC contractors and PV mounting system brands rely on us as a one-stop source for their fastener requirements.

Solar PV Fasteners Series — Complete Product Range

To begin with, we manufacture a comprehensive range of photovoltaic fasteners. Specifically, the table below summarizes the main product types.

Material & Corrosion Resistance Specifications

• To begin with, we use A2 (304) stainless steel as the standard material for our solar PV fasteners. A2-70 grade is ideal for inland and mild climate applications.
• Moreover, we supply A4 (316) stainless steel for coastal and high-corrosion environments. A4-80 grade contains molybdenum to resist chloride attack from salt air.
• Additionally, our bi-metal screws combine a stainless steel body with a hardened carbon steel drill tip. This allows self-drilling through steel purlins without pre-drilling.
• Furthermore, our solar fasteners are salt spray tested to 1,000 hours. This ensures reliable long-term performance in outdoor PV installations.
• For special orders, we supply hot dip galvanized (HDG) T-bolts and ground screws for ground-mount systems.
• Finally, we offer OEM & ODM — we customize dimensions, thread types, materials, coatings, and packaging according to your drawings.

A2 vs A4 Stainless Steel — Material Selection for Solar Mounting Fasteners

In fact, material selection is critical for solar mounting fasteners exposed to outdoor environments. Furthermore, the choice between A2 and A4 stainless steel depends on your project location and exposure conditions.

Therefore, if your project is located inland, A2-70 solar fasteners provide adequate corrosion protection at competitive cost. However, if your project is within 500 meters of the coastline, we recommend A4-80 fasteners for superior salt resistance.

Standards & Compliance for Solar PV Fasteners

In addition, our solar PV fasteners comply with major international standards for dimensions, materials, and mechanical properties.

• First, our socket head cap screws meet DIN 912 dimensions. These are commonly used for rail-to-bracket connections.
• Second, our flange nuts meet DIN 6923 with serrated flange for locking performance.
• Third, our self-locking nuts meet DIN 985 for vibration-resistant joints.
• Fourth, our stainless steel fasteners meet ISO 898 for mechanical properties of A2-70 and A4-80 grades.
• Finally, our bi-metal screws meet DIN 7504 for self-drilling screw dimensions and performance.

About Our Factory — Direct Manufacturer of Solar PV Fasteners

In fact, Tarco Industry operates a modern manufacturing facility. Specifically, we dedicate it to the production of solar PV fasteners and photovoltaic mounting hardware.

Furthermore, we complete every step in our own factory. This includes wire drawing, cold heading, thread rolling, heat treatment, and surface finishing. Consequently, we do not outsource production. We do not act as a middleman.

In addition, we equip our factory with advanced multi-station cold forging machines and automated thread rolling lines. As a result, we produce high-strength solar fasteners with consistent dimensions and reliable mechanical properties.

Therefore, whether you need standard PV fasteners or custom configurations, Tarco Industry can produce them directly for you.

Factory Direct Advantages

• First, we are a Manufacturer, Not a Trader. You buy directly from Tarco Industry production lines, eliminating middleman markups.
• Second, we handle In-House Production. We produce bolts, screws, nuts, and washers all under one roof for full quality control.
• Third, we welcome OEM & ODM. We customize dimensions, thread types, materials, coatings, and packaging.
• Fourth, we maintain Bulk Production Capacity. We ensure stable output for large PV farm and rooftop projects.
• Finally, we provide Factory Price. We offer competitive direct pricing for EPC contractors, distributors, and OEM buyers.

Why Choose Our Solar PV Fasteners?

• For example, our fasteners offer A2/A4 Stainless Steel Construction. Reliable corrosion resistance for inland and coastal PV installations.
• In addition, they provide 1,000-Hour Salt Spray Performance. Tested to withstand the most demanding outdoor environments.
• Moreover, they feature Bi-Metal Self-Drilling Design. The hardened steel tip drills through steel purlins without pre-drilling.
• Furthermore, they ensure Full Standards Compliance. DIN 912, DIN 6923, DIN 985, and ISO 898 certified.
• As a result of their Complete Product Range, we cover every fastening point in a PV mounting system.
• Finally, we provide Direct Factory Support. Tarco Industry provides technical guidance, samples, and custom production.

How to Install Solar PV Fasteners

1. First, select the correct fastener. Choose the right material (A2 or A4) based on your project location and exposure.
2. Then, prepare the mounting surface. Ensure the rail or bracket surface is clean and free of debris.
3. Next, position the fastener. Insert the bolt or hanger bolt through the aligned holes in the mounting structure.
4. After that, tighten to the specified torque. Use a calibrated torque wrench to achieve the required clamping force.
5. Finally, verify the connection. Check that all fasteners are properly tightened and the sealing washers are compressed evenly.

Applications & Industries for Solar PV Fasteners

• For instance, in rooftop solar installations, our hanger bolts and bi-metal screws secure mounting rails to wooden beams and steel purlins.
• Also, in ground-mount PV systems, T-bolts and rail clamps connect modules to driven piles and concrete foundations.
• In addition, for solar trackers, our bolts and nuts provide reliable connections for single-axis and dual-axis tracking systems.
• Furthermore, in commercial and industrial buildings, our fasteners secure large-scale rooftop arrays on metal and sandwich panel roofs.
• Lastly, in coastal and offshore PV projects, our A4-80 stainless steel fasteners resist chloride corrosion for long-term reliability.

Quality Assurance & Certifications

Furthermore, Tarco Industry manufactures our Solar PV fasteners under strict quality control. Specifically, they comply with ISO 898 for mechanical properties, ISO 14555 for welding, and DIN standards for dimensions.

As a result, we perform dimensional inspection, tensile testing, salt spray testing, and material certification. Moreover, we test every production batch before shipment.

• Additionally, we offer certifications including ISO 9001, CE, and SGS.
• Similarly, our production capacity reaches 20 million pcs per month.
• Also, we set the MOQ at 50,000 pcs (negotiable for sample orders).
• In terms of packaging, we offer bulk cartons on pallets with custom marking.
• Finally, we deliver within 15–20 business days after order confirmation.