Zinc Alloy or Stainless Steel Concealed Hinge: How to Choose

Updated 2026-11-09 · RAYEN 雷茵

What should you decide first?

• Door weight. Above 100kg, only stainless is listed.
• Where the door is: a dry room, a bathroom, or near the sea.
• The finish the customer has chosen.
• How much you need from the listing before you cut: door thickness, routing and adjustment.

Zinc alloy and 304 models: the EDA series

The EDA series is named three-dimensionally adjustable and is sold by overall length.

• Zinc alloy at 40kg: EDA-08A at 106mm, EDA-36 at 110mm, EDA-37 at 115mm, EDA-08 at 130mm.
• Zinc alloy at 50kg to 100kg: EDA-38B 50kg, EDA-09 60kg, EDA-06D and EDA-34 80kg, EDA-11 100kg at 190mm.
• 304 stainless: EDA-39 120kg at 160mm, EDA-40 200kg at 240mm.

The clearest comparison is length for length. EDA-06D in zinc alloy and EDA-39 in 304 stainless are both 160mm long, and the stainless one carries 120kg against 80kg.

Stainless 304/316L: the R and RY series

These are listed in 304/316L, from 30kg on R-CS30 to 200kg on R-CC200, R-CC200J and R-CC300. Each also prints the thinnest door it fits, the cutter and pocket, and on most RY and R-CC models the adjustment range. The R-CS models list no adjustment.

Which finishes come with each?

Finish is often where zinc alloy wins.

• EDA-06D: White, Matt Black, Brushed Black Nickel, Antique Bronze, PVD, Polished Chrome and Brushed Nickel.
• EDA-09: the same list without Brushed Nickel.
• Most other EDA models: Matt Black or Silver.
• R and RY series: Sandblasted and Brushed, Matt Black, Green Antique Bronze, PVD High-gloss Gold, Gunmetal Grey and PVD Gold.

A white or polished chrome hidden hinge comes from the zinc alloy list, and a brushed stainless look from the R-series.

What about damp and coastal sites?

Write the grade on the order. On the R and RY series, ask for 316L when the door is near the sea or in a wet room. For zinc alloy, tell us the site before you choose, because the finish then has to do the protecting. The hinge materials guide covers grades across the range.

Two worked examples

A wardrobe and bedroom door package

Doors of 35kg to 55kg, white finish, dry rooms. EDA-09 carries 60kg on two hinges and comes in White, so one model can cover the run. Ask us for its door thickness and routing, which are on the drawing.

A seaside hotel bathroom door

A 45mm door at 70kg, matt black. R-CS80 carries 80kg on two, needs a 36mm door, comes in Matt Black, and is listed in 304/316L. Write 316L on the order. If you also want adjustment, RY100 carries 100kg on a 33mm door with ±3.0mm up and down.

Does a longer hinge always carry more?

Not on its own. EDA-08 at 130mm carries 40kg, while EDA-09 at 135mm carries 60kg, and EDA-38B at 129.8mm carries 50kg. Read the load, not the length, and compare models at the door weight you actually have.

What about self-closing hidden hinges?

If the door must also close itself, zinc alloy is the usual body. JL607, JL608, JL609, EDA-09C and EDA-20 are zinc alloy. RY8001 and RY8002 combine zinc alloy with aviation aluminium, and RY8004 adds 304 stainless. None of the self-closing hidden hinges is listed in stainless alone. See hydraulic hinge types.

What is the next step?

Send the door weight, thickness, finish and site to [email protected], and we propose one zinc alloy and one stainless option with their drawings. To ask quickly about a finish, WhatsApp the factory owner. The number is on the contact page.

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