# Hex key Proline 4 mm — 1 pc (model 48444)

**URL:** https://aio.lv/en/product--proline-48444--11819016
**Data updated:** 2026-03-09 11:06 (EET)
**Category:** Wrenches & Adjustable Wrenches
**Manufacturer:** Proline
**Manufacturer code:** 48444
**EAN:** 5903755484444
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 3.49 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 2.88 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--proline-48444--11819016

## 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

Proline hex key, model 48444, single 4 mm metric hex key supplied as one piece. Designed for tightening and loosening hex (Allen) fasteners in furniture assembly, bicycle maintenance and general mechanical work. Compact hand tool made for use in confined spaces and for precision torque control on M4-size fasteners.

## Long description

Proline 4 mm hex key (single piece) is a compact hand tool designed for tightening and loosening metric M4 hex (Allen) fasteners. Manufactured from quenched and tempered steel with a polished chromium finish, this hex key combines strength and corrosion resistance while preserving a slim profile for access in confined spaces. The single 4 mm size offers precise torque control for assembly and maintenance tasks where M4 fasteners are specified.
Advantages
The hardened and tempered steel construction provides durability and resistance to bending under regular torque loads. Polished chromium finishing improves surface protection against corrosion and makes the tool easier to clean after use. Its compact, single-piece design ensures straightforward handling and storage while allowing access to tight or recessed fasteners. The accurate 4 mm tip geometry ensures a secure fit with hex socket heads to minimize rounding.
Suitable for
 Furniture assembly and disassembly using M4 hex fasteners
 Bicycle maintenance where 4 mm Allen keys are required
 Electronics and appliance maintenance with small metric hex screws
 General mechanical repairs and precision fastening tasks
Key specifications
 Size: 4 mm (metric)
 Quantity: single piece
 Material treatment: quenched and tempered steel
 Surface finish: polished chromium
 Tool type: straight hex (Allen) key
 Intended fastener: M4 hex socket heads
How to use
Insert the 4 mm hex key into the corresponding hex socket of the fastener, ensuring full engagement of the tip. Apply steady torque, using a longer lever arm where more torque is needed and the shorter end for confined spaces or finer control. Avoid excessive force beyond the recommended torque for M4 fasteners to prevent tool or fastener damage. After use, wipe the tool clean and store it in a dry place to maintain the polished chromium finish.
Usage recommendations
Use this 4 mm Proline hex key for repetitive tasks with M4 fasteners, and pair it with an appropriate torque specification or torque-limiting device when working on components sensitive to overtightening. Inspect the tip periodically for wear and replace the tool if the tip becomes rounded to ensure continued secure engagement.

## Specifications

| Feature | Value |
|---|---|
| Number of keys included | 1 pc(s) |
| Hex key sizes (metric) | 4 |

## FAQ

### How much does the Hex key Proline 48444 — 4 mm cost, and is it available for purchase?

The price is 3.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 200 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 Proline 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 Proline 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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