# Hex key Proline 4 mm — Proline 48522, single metric Allen key

**URL:** https://aio.lv/en/product--proline-48522--11819316
**Data updated:** 2026-03-09 11:07 (EET)
**Category:** Wrenches & Adjustable Wrenches
**Manufacturer:** Proline
**Manufacturer code:** 48522
**EAN:** 5903755485229
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 5.99 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 4.95 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--proline-48522--11819316

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 08.07.2026 | free |
| Pickup points | 13.07.2026 | 1.99 EUR |
| Courier delivery to door | 13.07.2026 | 4.99 EUR |

## Summary description

Proline 48522 is a single metric hex (Allen) key with a 4 mm tip size. Designed for driving hexagonal socket screws, this compact hand tool suits assembly, maintenance and repair tasks on furniture, bicycles, machinery and equipment that require a 4 mm hex. Durable construction provides precise fit and torque transfer for routine workshop and household use.

## Long description

Proline 4 mm hex key (Allen key) is a single metric hand tool designed for driving screws with a 4 mm hexagonal socket. The compact, straight L-shaped tool provides a precise fit for 4 mm fasteners and is intended for routine assembly, maintenance and repair tasks in workshops and around the home. Its simple construction ensures reliable torque transfer and controlled handling when tightening or loosening hex bolts.
Advantages
The solid steel construction and accurately machined tip provide a snug engagement with 4 mm hex sockets, reducing wear on both tool and fastener. Its compact length makes it easy to carry in a toolbox or pocket and convenient for use in confined spaces. The long arm gives additional leverage when higher torque is required, while the short arm allows quick turning in tight areas. The straightforward design requires no additional adjustments or accessories.
Suitable for (tasks / use cases)
Assembling and tightening furniture fasteners with 4 mm hex heads
Bicycle maintenance where 4 mm Allen keys are specified
Small machinery and equipment servicing that uses 4 mm hex screws
General household repairs involving 4 mm hex bolts
Key specifications
Tip size: 4 mm hex
Tool type: single metric hex (Allen) key
Shape: L-shaped (short and long arm)
Material: hardened steel (solid construction for torque transfer)
Finish: corrosion-resistant surface treatment
How to use
Select the 4 mm end and insert it fully into the hex socket of the fastener to ensure correct engagement. Use the short arm for rapid turning and the long arm to apply greater torque when loosening or tightening. Maintain a straight alignment between the key and the fastener to avoid rounding the socket. After use, wipe the tool clean and store it in a dry place to preserve the surface treatment and prevent corrosion.
Usage recommendations
Use only the exact 4 mm hex key for 4 mm fasteners to avoid damaging screw heads. Do not use cheater bars or excessive force beyond typical hand torque; for high-torque applications, consider a dedicated tool designed for greater leverage or impact drivers specified for hex fasteners.

## Specifications

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

## FAQ

### How much does the Hex key Proline 48522 — 4 mm cost, and is it available for purchase?

The price is 5.99 € (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 08.07.2026 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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