can it be used to connect copper pipes?

So long as the tubing wall thickness is enough, it should be fine. Will it hold full pressure the fitting is rated at? Probably not due to the softer copper. But I've used this sort of fitting on parflex without issue, just keep the pressure desired in mind.

what size are the hex nut?

The size of the nut depends on the size of the pipe you are using it on..3/4 3/8 1/4 pipe

Is this suitable for regular steel fuel line?

It is specially used to connect hard pipes, not limited to fuel pipes, including gas pipes, oil pipes and water pipes. When using, it is necessary to keep the cross section of pipes vertical.

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Beduan 304 Stainless Steel Compression Tube Fitting, 1/2" x 1/2" Tube OD, Straight Connect, Double-Ferrule Adapter

Product ID: 162984678

Details

Size
0.5 Inch
Material
Stainless
Brand
beduan
Color
Stainless
Connector Type
Union
Thread Type
NPT

🔩1/2" OD

🛠️Double-Ferrule

🛡️Corrosion Resistant

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VT5090

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Description

🔧 Connect with Confidence!

LEAK PROOF DESIGN - Double ferrule fitting minimizes the risk of leaks.
UNMATCHED DURABILITY - Crafted from premium 304 stainless steel for superior strength.
COMPACT LIGHTWEIGHT - Weighs only 0.08 kg, perfect for tight spaces.
PRECISION ENGINEERING - Designed for a perfect fit with a 1/2" tube OD.
VERSATILE CONNECTIVITY - Easily connects pipes and fittings of various types.

The Beduan 304 Stainless Steel Compression Tube Fitting is a high-quality, durable adapter designed for seamless connections between pipes and fittings. Made from chemically hardened 304 stainless steel, it offers exceptional strength and corrosion resistance, ensuring long-lasting performance. With a double-ferrule design, this fitting significantly reduces the risk of leaks, making it an essential component for any plumbing or piping project.

Specifications

Size	0.5 Inch
Material	Stainless Steel
Brand	beduan
Color	Stainless Steel
Connector Type	Union
Thread Type	NPT
Item Weight	0.08 Kilograms
Number of Pieces	1
Manufacturer	Beduan
Part Number	1kl-08900-PUINCH
Item Weight	2.89 ounces
Package Dimensions	2.13 x 1.5 x 1.1 inches
Item model number	1kl-08900-PUINCH
Shape	adapter
Measurement System	inch
Batteries Included?	No
Batteries Required?	No

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VT5090

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

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