# Drill bit Proline 78051K, solid metal drill, diameter 5.1 mm, length 86 mm, 1 pc

**URL:** https://aio.lv/en/product--proline-78051k--11720587
**Data updated:** 2026-03-08 11:23 (EET)
**Category:** Drill Bits
**Manufacturer:** Proline
**Manufacturer code:** 78051K
**EAN:** 5903755153975
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 5.99 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 4.95 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--proline-78051k--11720587

## 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

Single Proline 78051K drill bit designed for metalworking. Solid drill with 5.1 mm diameter and 86 mm length, supplied as one piece. Suitable for drilling steel and other metals with handheld drills or drill presses; useful for fabrication, repair, and installation tasks requiring a precise 5.1 mm hole.

## Long description

Proline 78051K is a single solid metal drill bit with a working diameter of 5.1 mm and an overall length of 86 mm, intended for metalworking tasks. Manufactured from high-class HSS steel with 5% cobalt and produced entirely by grinding, this drill bit offers accuracy and straightness for drilling precise 5.1 mm holes in a range of difficult-to-machine metals. The 135° point angle with chamfering adjustment facilitates fast centring and reduced walking, while the cobalt content and heat resistance make it suitable for demanding materials and repeated drilling operations.
Advantages
This Proline solid drill bit combines HSS with 5% cobalt for improved hardness and temperature resistance, enabling longer life when working with high-alloy and stainless steels. The fully ground geometry ensures high dimensional accuracy and rectilinearity of holes. The 135° point angle with chamfering adjustment reduces the need for re-marking and provides quicker penetration. Supplied as a single piece in blister packaging, the drill is balanced for use in both handheld drills and drill presses.
Suitable for
Drilling holes in stainless steel and acid-resistant alloys
Working with high-alloy, creep-resistant and titanium-containing steels
Fabrication, repair and installation tasks requiring precise 5.1 mm holes
Use with handheld power drills and bench drill presses
Key specifications
Diameter: 5.1 mm
Overall length: 86 mm
Material: high-speed steel (HSS) with 5% cobalt
Point geometry: 135° point angle with chamfering adjustment
Manufacturing: fully ground flute and cutting geometry for high accuracy
Suitable materials: high-alloy steels, stainless and acid-resistant steels, titanium alloys, cast iron and other hard-to-machine metals
How to use
Secure the Proline 78051K drill bit in the drill chuck ensuring correct centring and tight clamping. Select an appropriate speed and feed for the material being drilled — lower speeds for stainless and high-alloy steels to reduce heat buildup. Apply cutting fluid or coolant when drilling hard or heat-sensitive materials to extend tool life and improve chip evacuation. Use moderate, steady pressure and avoid excessive side loading to preserve the cutting edges and maintain hole straightness.
Usage recommendations
For best results when drilling stainless or high-alloy steels, pre-drill with the specified 5.1 mm diameter using cutting fluid, operate at reduced spindle speed, and periodically withdraw the drill to clear chips. When using handheld drills, ensure stable workpiece clamping and consider a pilot hole for very thick or particularly hard materials.

## Specifications

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

## FAQ

### How much does the Drill bit Proline 78051K — 5.1 mm, 86 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 — 100 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

https://aio.lv/img/cache/product/11720587/67193502_large.webp