# Chuck key Proline 6/8/10 mm 12-tooth model 31388

**URL:** https://aio.lv/en/product--proline-31388--11876603
**Data updated:** 2026-03-09 20:41 (EET)
**Category:** Power Tools Accessories
**Manufacturer:** Proline
**Manufacturer code:** 31388
**EAN:** 5903755313881
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 5.99 €
**Prices and availability valid until:** 2026-07-30 23:59
**Price without VAT (21%):** 4.95 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--proline-31388--11876603

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 17.07.2026 | free |
| Pickup points | 22.07.2026 | 1.89 EUR |
| Courier delivery to door | 22.07.2026 | 4.99 EUR |

## Summary description

Proline chuck key 31388 is a manual tool for tightening and loosening drill chucks with 12 teeth, compatible with 6 mm, 8 mm and 10 mm chuck sizes. It provides mechanical engagement via the 12-tooth gear for secure grip on drill bits and accessories. Suitable for workshop, maintenance and DIY tasks requiring reliable chuck adjustment.

## Long description

Proline chuck key model 31388 is a manual accessory designed for tightening and loosening 12-tooth drill chucks with compatible jaw sizes of 6 mm, 8 mm and 10 mm. The tool provides positive mechanical engagement through its 12-tooth gear, enabling secure clamping and release of drill bits and accessories in handheld and bench drills. Constructed for routine workshop, maintenance and DIY use, the chuck key is straightforward to operate and intended to deliver consistent chuck adjustments when precise bit retention is required.
Advantages
The 12-tooth gear profile ensures accurate meshing with compatible chucks for reliable torque transmission during tightening and loosening. Compact and lightweight, the chuck key is easy to store in toolboxes or attach to a drill stand for quick access. Its compatibility with three common chuck jaw sizes (6 mm, 8 mm, 10 mm) reduces the need for multiple keys and simplifies tool management. The simple mechanical design offers durability and minimal maintenance.
Suitable for
Tightening and loosening drill chucks in handheld drills
Workshop and maintenance tasks requiring frequent bit changes
DIY projects at home where standard 6/8/10 mm chucks are used
Light industrial applications with manual chuck adjustment
Key specifications
Tooth count: 12-tooth gear for mechanical engagement
Compatible chuck jaw sizes: 6 mm, 8 mm, 10 mm
Function: manual tightening and loosening of drill chucks
Use environment: workshop, maintenance, DIY, light industrial
How to use
Insert the key's gear into the matching 12-tooth recess on the drill chuck and rotate clockwise to tighten or counterclockwise to loosen the jaws. Hold the drill body or spindle steady while operating the key to prevent slippage and ensure even engagement of the jaws around the bit. Verify that the bit is centered and securely clamped before starting the drill; repeat tightening if necessary to achieve firm retention.
Usage recommendations
Use the chuck key only with chucks that match the 12-tooth profile and the supported jaw sizes (6 mm, 8 mm, 10 mm). Avoid excessive force when tightening to prevent damage to the chuck or key. Keep the key clean and free of debris, and store it in a dry place to reduce wear. For repetitive high-torque or production use, consider a keyed or keyed chuck maintenance schedule to check for wear.

## FAQ

### How much does the Proline chuck key 31388 6/8/10 mm 12-tooth 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 — 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 17.07.2026 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/11876603/67293500_large.webp