# Wood construction screw Koelner TS-4020 4x20 mm countersunk head Torx drive

**URL:** https://aio.lv/en/product--koelner-ts-4020--11800872
**Data updated:** 2026-03-09 07:39 (EET)
**Category:** Miscellaneous repair tools
**Manufacturer:** Koelner
**Manufacturer code:** TS-4020
**EAN:** 5906675455143
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 11.49 €
**Prices and availability valid until:** 2026-07-19 23:59
**Price without VAT (21%):** 9.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--koelner-ts-4020--11800872

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 10.07.2026 | free |
| Pickup points | 15.07.2026 | 1.99 EUR |
| Courier delivery to door | 15.07.2026 | 4.99 EUR |

## Summary description

Koelner TS-4020 is a 4x20 mm wood construction screw with a countersunk (conical) head and Torx (TX) drive. Designed for joining timber and wood-based materials, it provides secure fastening with reduced splitting due to its dimensions and head type. Suitable for furniture assembly, carpentry, framing and general woodworking tasks where a flush finish is required.

## Long description

Koelner TS-4020 is a 4x20 mm wood construction screw with a countersunk (conical) head and Torx (TX) drive designed for joining timber and wood-based materials. Its 4 mm shank diameter and 20 mm length make it suitable for light- to medium-duty woodworking tasks where a flush surface is required. The countersunk head allows the fastener to sit level with or below the material surface for clean finishes in furniture assembly, trim work and general carpentry.
Advantages
The Torx drive provides improved torque transfer and reduces cam-out compared with slotted or Phillips drives, allowing faster and more controlled installation. The countersunk head design minimizes protrusion and helps prevent snags or interference with adjacent parts. Its dimensions and thread profile are selected to reduce splitting in typical timber and engineered wood panels while maintaining firm clamping force between joined elements.
Suitable for
Furniture assembly and fittings
Interior carpentry and trim
Framing of lightweight structures
Fixing wood-based panels and laminates
Key specifications
Diameter: 4 mm
Length: 20 mm
Head type: Countersunk (conical)
Drive type: Torx (TX)
Material: Steel (typical for wood construction screws)
Typical finish: Corrosion-resistant coating (dependent on variant)
How to use
Select an appropriate pilot hole size if working with dense hardwoods or near edges to further reduce splitting; for softer woods pilot drilling is often unnecessary. Use a matching Torx bit in a manual screwdriver or powered driver, apply steady pressure and drive at a controlled speed until the head is flush or slightly countersunk with the workpiece. Avoid over-torquing which can strip the drive or damage the material.
Usage recommendations
For best results, choose screw length so that at least two-thirds of the screw penetrates the receiving member. When installing into engineered boards, consider pre-drilling when close to board edges or ends. Use compatible Torx bits to preserve bit and drive life, and select a corrosion-resistant finish variant for any application exposed to humidity.

## FAQ

### How much does the Koelner TS-4020 wood screw 4x20 mm cost, and is it available for purchase?

The price is 11.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 98 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 10.07.2026 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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