# Hex Bit Wera 840/4 IMP 4 mm diamond coated alloy tool steel

**URL:** https://aio.lv/en/product--wera-05073944001--1970292
**Data updated:** 2026-02-12 09:46 (EET)
**Category:** Screwdriver Bits
**Manufacturer:** Wera
**Manufacturer code:** 05073944001
**EAN:** 4013288158451
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 23.99 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 19.83 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--wera-05073944001--1970292

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

Wera Hex Bit 840/4 IMP is a 4 mm hex bit made of alloy tool steel with a diamond coating for improved grip in screwed fasteners. Designed for use with impact drivers and bit holders, it provides increased slip resistance and durability for assembly, maintenance, and repair tasks. Suitable for professional and hobby use where a secure bit-to-fastener interface is required.

## Long description

Wera Hex Bit 840/4 IMP 4 mm diamond coated alloy tool steel is a hexagonal screwdriver bit engineered for use with impact drivers and bit holders. Machined from alloy tool steel and finished with a diamond coating, this 4 mm hex bit is intended to improve contact with screw heads and reduce cam-out during high-torque fastening operations. The bit’s construction balances hardness and toughness for repeated assembly, maintenance, and repair tasks in workshop and field environments.
Advantages
The diamond coating increases surface friction between the bit and fastener, improving slip resistance and reducing the likelihood of rounding screw heads. Alloy tool steel provides enhanced wear resistance and impact strength compared with standard tool steels, extending service life under frequent use. The bit is sized precisely to fit 4 mm hex sockets, ensuring a secure fit in compatible fasteners and minimizing wobble during operation. Designed for impact applications, the geometry and material combination deliver consistent performance when used with impact drivers and compatible bit holders.
Подходит для
Монтажные и разборочные работы с 4 мм шестигранными крепежными элементами
Техническое обслуживание и ремонт в мастерских и на выездных объектах
Использование с ударными шуруповёртами и держателями бит
Профессиональные и любительские проекты, требующие повышенной стойкости к срыву
Key specifications
Bit type: 4 mm hex (internal hexagon)
Material: alloy tool steel
Surface finish: diamond coating for improved grip
Intended use: impact driver compatible
Application area: assembly, maintenance, repair
Design: precision-machined tip for secure fastener engagement
How to use
Insert the 4 mm hex bit into a compatible bit holder or directly into the chuck/drive of an impact driver. Ensure the bit seats fully and locks in the holder to avoid axial play. Select an appropriate torque and speed setting on the impact driver suited to the fastener and material to prevent over-torquing. Apply steady pressure aligned with the fastener axis while driving or loosening screws. After use, wipe the bit clean of debris and store it in a dry, secure place to protect the diamond coating and maintain fit accuracy.
Usage recommendations
Use the bit with impact-rated holders and tools to match its design. Avoid using damaged or heavily worn bits on high-value fasteners to prevent damage to screw heads. Periodically inspect the diamond coating and tip geometry; replace the bit if excessive wear or deformation is observed to preserve fastening quality.

## FAQ

### How much does the Hex Bit Wera 840/4 IMP 4 mm cost, and is it available for purchase?

The price is 23.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 20 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 23.07.2026 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. 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 Wera 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 Wera 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

https://aio.lv/img/cache/product/1970292/47537137_large.webp