Sofa Bed Hardware & Parts: Conversion Kits, Folding Mechanisms, Replacement

When a sofa bed stops working, it’s rarely the whole sofa — it’s one hinge, one mechanism, one spring. This page is for the buyers sourcing the parts: conversion kits, folding mechanisms, replacement hinges, and the assorted hardware that makes a sofa bed actually fold.

We’re Xiongfa, and our Sofa Hinges range covers the hardware side of sofa beds — pull-out mechanisms, hinges, plates and spring hinges, all iron with galvanization or black. If you need a replacement or a kit, here’s what we make and how to match it.

What counts as “sofa bed hardware”

• Pull-out mechanisms — the slide/track system that extends the bed (our 301 dual wheel, 302 single wheel, 303 drawer).
• Folding hinges — the pivot that folds the bed section (304 large, 305 plate).
• Spring hinges — return-action hinges (306 small, 307 medium, 309 split spring).
• Conversion kits / replacement parts — the specific hinge or mechanism you swap into an existing frame.

Matching a replacement part

This is where people go wrong, so the rule is simple: match the actual part, not the name.

• Get the original hinge or mechanism, or clear photos from several angles.
• Note length, material thickness, mounting-hole positions, and whether it’s a spring type.
• Confirm whether it’s a pull-out mechanism (301–303) or a hinge (304–309).

Our “large / small / medium” labels are official names, not dimensions — so the size still needs confirming. If the model’s unknown, send photos plus the key dimensions and we’ll identify it.

Conversion kits

A “sofa bed conversion kit” usually means swapping a manual fold for a mechanism, or refreshing an old bed’s hardware. Because frames differ, we confirm the mechanism type and dimensions before quoting — a kit isn’t one universal box. Send the frame details or the original part and we’ll tell you what fits.

Heavy-duty and hidden options

Buyers sometimes ask for “heavy duty” or “hidden” sofa bed hinges. Our iron range is the standard-duty line; if your frame needs a heavier section or a concealed mount, that’s an OEM job — send the drawing or sample and we’ll confirm whether a catalog model covers it or we make to spec.

What to send for a quote

Part type (mechanism / hinge / spring), model if known, photo or drawing, dimensions, quantity, finish. The more you give, the fewer wrong parts ship. Once sorted, send it through our Request a Quote page. The Sofa Hinges category lists every model with photos.

FAQ

What is a sofa bed conversion kit?

Usually the hardware to convert or refresh a sofa bed — a mechanism or hinge swap. It’s matched to the frame, not one universal kit, so confirm the type first.

Can I buy just a replacement hinge?

Yes — match the model by dimensions (304–309 for hinges/springs, 301–303 for pull-out). Send photos if the model’s unknown.

Do you make heavy-duty sofa bed hinges?

Our iron range is standard duty. Heavier or concealed mounts are an OEM job — send the spec and we’ll confirm.

How do I avoid the wrong replacement part?

Match the actual part by dimensions and type, not the name. Photos from several angles plus length and hole positions get us there fastest.