# Thread adapter BIG 1/4"–3/8" 9 mm model 428284 for tool fittings

**URL:** https://aio.lv/en/product--big-428284--1894910
**Data updated:** 2025-12-29 07:52 (EET)
**Category:** Tool kits and accessories
**Manufacturer:** BIG
**Manufacturer code:** 428284
**EAN:** 4741326404580
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 5.49 €
**Prices and availability valid until:** 2026-07-20 23:59
**Price without VAT (21%):** 4.54 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--big-428284--1894910

## 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

Thread adapter BIG model 428284 converts between 1/4" and 3/8" threads with a 9 mm body. It is designed for connecting tools and fittings with differing thread sizes, simplifying compatibility between air or hand tools and accessories. Compact and easy to install, it provides a secure threaded connection for workshop or professional use.

## Long description

Thread adapter BIG 1/4"–3/8" model 428284 with a 9 mm body converts between 1/4" and 3/8" threads. It is intended for joining tools, fittings and accessories that use different thread sizes, providing a compact and secure threaded connection for workshop and professional use.
Advantages
The adapter offers straightforward mechanical compatibility between 1/4" and 3/8" threaded components without additional tools. Its 9 mm body is compact for easy installation in tight spaces, and the sturdy threaded construction ensures reliable connection under typical workshop loads.
Suitable for
Connecting pneumatic hoses and fittings with 1/4" and 3/8" threads
Adapting hand tools and air tools to accessories with a different thread size
Workshop, maintenance, and professional repair tasks requiring mixed-thread connections
Key specifications
Brand: BIG
Model / MPN: 428284
EAN: 4741326404580
Thread sizes: 1/4" to 3/8"
Body diameter: 9 mm
How to use
Select the correct thread orientation for the component you are connecting, screw the adapter firmly by hand until seated, then tighten with an appropriate wrench if needed to ensure a secure connection. Avoid over-tightening to prevent thread damage. Inspect threads and sealing surfaces for cleanliness before assembly.
Usage recommendations
Use the adapter only with compatible thread types and within the pressure and torque limits of the connected tools and fittings; routinely inspect the adapter and threads for wear or damage and replace if any defects are found.

## FAQ

### How much does the Thread adapter BIG 1/4"–3/8" model 428284 cost, and is it available for purchase?

The price is 5.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 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 BIG 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 BIG 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/1894910/3908436_large.webp