# Koelner B-FS3535 Phosphate Coated Screws for Steel 3.5x35mm

**URL:** https://aio.lv/en/product--koelner-b-fs3535--12319071
**Data updated:** 2026-05-18 02:47 (EEST)
**Category:** Tool kits and accessories
**Manufacturer:** Koelner
**Manufacturer code:** B-FS3535
**EAN:** 5906675013145
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 6.99 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 5.78 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--koelner-b-fs3535--12319071

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

Koelner B-FS3535 phosphate coated screws are designed for reliable fastening in steel structures. With a size of 3.5x35mm, these screws feature a specialized phosphate coating that provides enhanced corrosion resistance and improved adhesion for subsequent finishes. Ideal for professional construction and assembly tasks, they ensure a secure hold in metal profiles and steel elements.

## Long description

The Koelner B-FS3535 phosphate coated screws are precision-engineered fasteners designed specifically for secure attachment to steel structures and metal profiles. Measuring 3.5x35mm, these screws feature a specialized phosphate coating that serves a dual purpose: it provides essential protection against corrosion and creates an ideal surface texture for the adhesion of paints, plasters, or other finishing materials. These screws are built to meet the demands of professional construction environments, ensuring consistent performance and structural integrity in various metal-to-metal or board-to-metal applications.
Advantages
The primary benefit of these screws lies in their high-quality phosphate finish, which significantly enhances resistance to environmental factors while ensuring that subsequent layers of finishing materials bond effectively to the surface. The sharp point and thread design allow for rapid penetration into steel elements, reducing the time required for installation. Furthermore, the robust construction of the steel material ensures that the screws maintain their shape and holding power under tension, providing a reliable solution for long-term assembly projects.
Suitable for
Fastening gypsum boards to metal profiles
Assembling light steel frame structures
General construction tasks involving thin-gauge steel
Interior finishing work requiring a secure metal-to-metal connection
When it may not be suitable
These screws are not intended for use in highly corrosive environments, such as marine or coastal areas, where stainless steel fasteners would be required. They are also not suitable for heavy-duty structural steel connections that require high-tensile bolts or specialized anchoring systems.
Key specifications
Dimensions: 3.5mm diameter by 35mm length
Material: Carbon steel with phosphate coating
Application: Steel profiles and metal structures
Finish: Phosphate for improved adhesion and corrosion resistance
How to use
To achieve the best results, use a power screwdriver with an adjustable depth control to prevent over-driving the screw into the material. Position the screw perpendicular to the surface of the metal profile and apply steady pressure while driving. Ensure the screw head is flush with the surface of the material being fastened to maintain structural stability. If working with thicker steel profiles, pre-drilling may be necessary to prevent damage to the screw thread or the metal surface.
What to consider before purchase
Verify the thickness of the metal profiles to ensure the 35mm length is appropriate for your specific application.
Check the compatibility of your power tool bits with the screw head type.
Ensure the environment is suitable for phosphate-coated steel to avoid premature oxidation.
Usage recommendations: Always wear appropriate personal protective equipment, including safety glasses, when driving screws into metal. Store the screws in a dry environment to maintain the integrity of the phosphate coating until the moment of installation.

## FAQ

### How much does the Koelner B-FS3535 Phosphate Coated Screws 3.5x35mm cost, and is it available for purchase?

The price is 6.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 14 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 06.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Koelner products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Koelner service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

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