# Self-drilling Phosphate Screws for Metal Profiles Koelner/Rawlplug WS 3.5 x 25, phosphate coated, single unit

**URL:** https://aio.lv/en/product--koelnerrawlplug-r-ws-3525--12326762
**Data updated:** 2026-04-26 18:50 (EEST)
**Category:** Miscellaneous repair tools
**Manufacturer:** Koelner/Rawlplug
**Manufacturer code:** R-WS-3525
**EAN:** 5906675174969
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 20.99 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 17.35 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--koelnerrawlplug-r-ws-3525--12326762

## 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

Self-drilling phosphate-coated screws Koelner/Rawlplug WS 3.5 x 25 designed for fastening metal profiles and thin-sheet assemblies. The WS type includes an integrated drill point for drilling and tapping without pre-drilling, a phosphate surface finish for corrosion resistance and improved lubrication during installation. Supplied as a single-piece unit for repair or small assembly jobs.

## Long description

Self-drilling phosphate screws Koelner/Rawlplug WS 3.5 x 25 are designed for direct fastening of thin metal profiles and light-gauge sheet metal assemblies. The WS variant integrates a drill point that allows drilling and tapping in one operation without pre-drilling in many thin-metal applications. The phosphate coating provides basic corrosion resistance and improves lubricity during driving, making these screws suitable for repair tasks and small installation jobs where individual fasteners are needed.
Advantages
These screws combine a self-drilling tip with a phosphate finish to reduce installation time and improve thread engagement in thin metal. The integrated drill point eliminates the need for a separate drilling step in many cases, while the phosphate coating reduces friction and gives moderate protection against corrosion. Supplied as single units, they are convenient for one-off repairs or situations where bulk packaging is unnecessary.
Suitable for
 Fastening metal profiles to light-gauge steel or thin-sheet substrates
 Installation of framing, channels, and small metal assemblies
 Repair and maintenance where individual screws are needed
 Applications requiring drilling and tapping in one operation
When it may not be suitable
These screws are intended for thin metal and light-gauge profile work; they are not suitable for structural connections that require high shear or tensile strength. For thicker steel, concrete, masonry, or heavy-duty load-bearing applications, specialized fasteners or pre-drilling with appropriate anchors should be used. The phosphate coating offers limited corrosion protection and is not a substitute for stainless or fully galvanized fasteners in highly corrosive environments.
Key specifications
 Thread type: self-drilling, designed for metal-to-metal fastening
 Diameter: 3.5 mm
 Length: 25 mm
 Tip: integrated drill point for drilling and tapping without pre-drilling in thin materials
 Surface finish: phosphate coating for reduced friction and moderate corrosion resistance
 Drive type: compatible with common screwdrivers or bits used for metal screws
 Package quantity: single unit, suitable for repairs and small jobs
How to use
Select a suitable screwdriver or bit that matches the screw head profile and place the screw perpendicular to the metal surface. Apply steady pressure and drive at moderate speed so the integrated drill point can bore into the thin metal and form threads. Avoid excessive torque settings on power tools to prevent stripping the head or over-driving the screw. For optimal results in coated or thicker materials, check compatibility first and consider pilot holes or alternate fasteners if the screw does not advance smoothly.
What to consider before purchase
 Intended substrate: appropriate for thin-gauge metal profiles, not for thick structural steel or masonry
 Corrosion requirements: phosphate coating provides limited protection; choose stainless or galvanized fasteners for aggressive environments
 Load demands: assess whether a self-drilling screw of this size meets shear and tensile requirements for your application
 Quantity needs: sold as a single unit—order sufficient quantity for larger jobs
Usage recommendations
Use a compatible screwdriver bit and moderate torque. For repetitive installations, test on scrap material to confirm drilling and thread formation. Store in a dry place to preserve the phosphate finish and inspect each screw before use if corrosion resistance is critical.

## FAQ

### How much does the Koelner/Rawlplug WS 3.5 x 25 self-drilling screws cost, and is it available for purchase?

The price is 20.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 254 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/Rawlplug 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/Rawlplug 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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