# Drill bit GRAPHITE 57H026 cobalt for metal cylindrical tip 4.2 mm

**URL:** https://aio.lv/en/product--graphite-57h026--12263123
**Data updated:** 2026-04-14 22:34 (EEST)
**Category:** Drill Bits
**Manufacturer:** GRAPHITE
**Manufacturer code:** 57H026
**EAN:** 5902062570260
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 4.49 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 3.71 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--graphite-57h026--12263123

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 02.07.2026 | free |
| Pickup points | 07.07.2026 | 1.99 EUR |
| Courier delivery to door | 07.07.2026 | 4.99 EUR |

## Summary description

Cobalt metal drill bit GRAPHITE 57H026 with a 4.2 mm cylindrical tip, designed for drilling hardened and stainless steels and other metals. The cobalt composition increases heat resistance and wear life, making it suitable for workshop and industrial use with hand drills and drill presses. Ideal for precise metalworking, repairs and fabrication tasks.

## Long description

GRAPHITE 57H026 cobalt drill bit for metal, 4.2 mm cylindrical tip, is designed for drilling hardened and stainless steels as well as other ferrous and non-ferrous metals. The cobalt-enriched high-speed steel composition improves heat resistance and extends tool life under continuous cutting loads. The cylindrical tip geometry provides precise centering and consistent chip evacuation when used with hand drills and drill presses in workshop or light industrial environments.
Advantages
The cobalt alloy increases hardness at elevated temperatures, reducing wear during drilling of tough metals. The 4.2 mm diameter and cylindrical tip permit accurate hole positioning and predictable hole size, while the robust shank ensures steady clamping in standard drill chucks. This drill bit is suitable for repeated use on hardened materials where ordinary high-speed steel bits would lose cutting performance more quickly.
Suitable for
Drilling hardened steels and stainless steel
Metal fabrication, repair and modification tasks
Workshop use with hand-held drills and drill presses
Pilot holes and precision metalworking where a 4.2 mm hole is required
When it may not be suitable
This cobalt drill bit is not intended for prolonged use on masonry, concrete, or wood; such materials require dedicated masonry or wood bits. For very soft metals or non-metal materials where extreme hardness is unnecessary, a standard high-speed steel bit may offer adequate performance at lower cost. Extremely high-volume automatic production may require specialized carbide tooling for maximum lifetime and cycle speed.
Key specifications
Material: cobalt-enriched high-speed steel
Tip type: cylindrical (straight) tip
Diameter: 4.2 mm
Intended materials: hardened steel, stainless steel, other metals
Shaft type: straight shank for standard chucks
How to use
Select an appropriate drilling speed and apply steady feed pressure; lower speeds are recommended when drilling stainless or hardened steel to reduce heat build-up. Use cutting fluid or coolant to improve chip evacuation and extend tool life. Secure the workpiece firmly in a vice or fixture and ensure the drill bit is properly centered before starting. Withdraw the bit periodically to clear chips when drilling deeper holes.
What to consider before purchase
Confirm 4.2 mm diameter suits your hole requirements and any fastener or pilot specifications
Ensure your drill or drill press can run at speeds appropriate for cobalt HSS bits and accepts a straight shank
Consider whether cobalt-enhanced bits are necessary for your material, or if standard HSS or carbide would be more cost-effective
Usage recommendations
Use cutting fluid and moderate speeds when drilling stainless or hardened steels, clamp the workpiece securely, and avoid excessive side loads to maximize the service life of the 4.2 mm cobalt drill bit.

## FAQ

### How much does the GRAPHITE 57H026 cobalt metal drill bit 4.2 mm cost, and is it available for purchase?

The price is 4.49 € (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 02.07.2026 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 GRAPHITE 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 GRAPHITE 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/12263123/68177274_large.webp