# Drill bit Proline 5.1 mm (length 86 mm) model 77851K — 1 pc

**URL:** https://aio.lv/en/product--proline-77851k--11719834
**Data updated:** 2026-03-08 11:22 (EET)
**Category:** Drill Bits
**Manufacturer:** Proline
**Manufacturer code:** 77851K
**EAN:** 5903755154415
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 4.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 4.12 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--proline-77851k--11719834

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Pickup points | 08.07.2026 | 1.99 EUR |
| Courier delivery to door | 08.07.2026 | 4.99 EUR |

## Summary description

Single metal drill bit Proline 77851K with a 5.1 mm diameter and 86 mm overall length. Designed for drilling metal, this solid drill bit is supplied as one piece and suits general metalworking tasks, repairs and installation work where a medium-diameter twist bit is required.

## Long description

Single metal drill bit Proline 77851K with a 5.1 mm diameter and 86 mm overall length. This solid twist drill is engineered for drilling steel and other metals; its full-length precision grinding and titanium nitride coating improve wear resistance and hole finish. The 135° point angle with chamfering support enables fast centring and reduced walking during marking and starts, making it suitable for general metalworking, repairs and installation tasks where a medium-diameter metal drill is required.
Advantages
The drill is manufactured entirely by grinding to ensure concentricity and cutting geometry accuracy. A titanium nitride surface coating increases tool life and reduces friction for smoother penetration and improved hole quality. The 135° point angle with chamfer adjustment helps achieve quick, accurate starts and reduces the need for pilot holes in many metal applications. Supplied as a single piece in a blister pack that protects the cutting edge during storage and transport.
Suitable for
Drilling holes in steel, cast iron and non-ferrous metals
General metal fabrication and workshop repairs
Assembly and installation where precise medium-diameter holes are required
Maintenance tasks and retrofit drilling in mechanical components
Key specifications
Drill type: solid twist drill for metal
Diameter: 5.1 mm
Overall length: 86 mm
Point angle: 135° with chamfering adjustment
Manufacturing: full-length precision grinding
Coating: titanium nitride (TiN) for increased wear resistance
Packaging: single piece in a protective blister pack
How to use
Secure the workpiece and select an appropriate clamp or vise to prevent movement. Mark the hole position and, if needed for thin or hard materials, use a centre punch to create a starting dimple. Fit the 5.1 mm drill bit into the drill chuck and tighten securely. Use a steady feed and moderate speed appropriate to the metal type; apply cutting fluid or lubricant for improved cooling and chip evacuation. Withdraw the bit periodically to clear chips and prevent clogging. After drilling, deburr the hole as required.
Usage recommendations
For best performance, use recommended cutting speeds for the specific metal being drilled and apply cutting fluid when working with steel or alloyed materials. Start with a pilot hole if drilling in very hard or thick sections, and ensure the drill chuck is properly tightened to avoid runout.

## Specifications

| Feature | Value |
|---|---|
| Length | 86 mm |
| Metal drill bits diameter | 5.1 |
| Number of drill bits | 1 pc(s) |

## FAQ

### How much does the Proline drill bit 77851K 5.1 mm, 86 mm cost, and is it available for purchase?

The price is 4.99 € (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 03.07.2026 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

https://aio.lv/img/cache/product/11719834/67194694_large.webp