# Twist drill bit Irwin 10502549 — 4.2 mm, single piece

**URL:** https://aio.lv/en/product--irwin-10502549--11718203
**Data updated:** 2026-03-08 11:19 (EET)
**Category:** Drill Bits
**Manufacturer:** Irwin
**Manufacturer code:** 10502549
**EAN:** 05709131282976
**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--irwin-10502549--11718203

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

Irwin twist drill bit model 10502549 with a 4.2 mm diameter, supplied as a single piece. Designed for general drilling tasks in compatible materials using hand drills or drill presses. The straight-shank twist design provides efficient chip removal and stable drilling for preparatory, repair and installation work requiring precise 4.2 mm holes.

## Long description

Irwin twist drill bit model 10502549 with a 4.2 mm diameter is a single-piece HSS cobalt twist drill designed for precision drilling in a range of metals. The bit features a 135° split point and a cylindrical shank suitable for use in hand drills and drill presses. Manufactured to DIN 338 standards and produced with 5% cobalt content, this 4.2 mm drill bit is intended for demanding metalworking tasks where improved heat and abrasion resistance is required.
Advantages
The 5% cobalt composition increases heat and wear resistance compared with standard high-speed steel, helping maintain cutting performance at higher temperatures. The heavy-duty web construction improves strength and reduces the risk of breakage during heavy use. The 135° split point reduces bit walking at the start of drilling and enables quicker penetration, while the straight-twist geometry facilitates efficient chip evacuation for stable drilling and clean hole quality.
Suitable for
 Drilling holes in alloyed steel and other metals
 Work on stainless steel where greater abrasion resistance is needed
 Preparation, repair and installation tasks requiring a precise 4.2 mm hole
Key specifications
 Drill type: twist drill bit (single piece)
 Diameter: 4.2 mm
 Overall length: 75 mm
 Material: high-speed steel with 5% cobalt
 Point angle and style: 135° split point
 Shank type: cylindrical
 Standards: manufactured to DIN 338
 Suitable materials: alloyed steel, metal, stainless steel
How to use
Secure the twist drill bit in the chuck of a compatible hand drill or drill press, ensuring the cylindrical shank is fully gripped. Select an appropriate rotational speed and feed rate for the target material; lower speeds are recommended for hardened or stainless steels to reduce heat build-up. Use cutting fluid or coolant when drilling tougher or heat-sensitive metals to extend tool life and improve chip evacuation. Apply steady, even pressure and allow the split point to start the hole before increasing feed to avoid deflection.
Usage recommendations
Use cutting fluid for prolonged drilling in stainless or heat-treated steels, monitor bit temperature during extended operation, and replace the bit if signs of wear or chipping appear to maintain hole accuracy and safety.

## Specifications

| Feature | Value |
|---|---|
| Length | 75 mm |
| Proper use | Drill |
| Carrying case | Yes |
| Working length | 43 mm |
| Suitable for materials | Alloyed steel, Metal, Stainless steel |
| Drill bit diameter | 4.2 mm |
| Shank shape | Cylindrical shank |
| DIN compliance | 338 |
| Point angle | 135 ° |
| Drill bit material | High-Speed Steel (HSS) |
| Number of drill bits | 1 pc(s) |
| Drill bit type | Twist drill bit |

## FAQ

### How much does the Twist drill bit Irwin 10502549 — 4.2 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 — 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 07.07.2026 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 Irwin 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 Irwin 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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