9 gauge Zigzag Spring 25" / Each

9 Gauge Zigzag Upholstery Springs, No-Sag Sofa and Chair Seat Springs

Strong, Reliable Spring Support for Upholstered Seating

The 9 Gauge Zigzag Upholstery Springs provide resilient support for sofa seats, armchairs, dining chairs and other sprung upholstered furniture.

Also known as no-sag springs, sinuous springs or serpentine springs, these curved-wire furniture springs create a supportive seating foundation while allowing controlled movement under pressure.

Manufactured from 9-gauge (3.6mm) spring wire, they're suitable for replacing broken or weakened springs and for new furniture manufacture using compatible zigzag spring suspension systems.

Available in 12 lengths from 18" to 30", they can be purchased individually or in convenient packs of 25 or 50.

Features

• 9-gauge spring wire, 3.6mm diameter for supportive seat suspension.
• Zigzag / serpentine design, provides resilient support across upholstered seating frames.
• 12 available lengths, 18" to 30".
• Individual or bulk quantities, sold each or in packs of 25 and 50.
• Space-efficient suspension, suitable for shallow furniture seating frames.
• applications, sofas, armchairs, dining chairs, footstools and benches.
• Use it for repairs, replace damaged or weakened furniture springs.

What Are Zigzag or No-Sag Upholstery Springs?

Zigzag springs are continuous lengths of spring wire formed into repeated S-shaped curves.

They are normally fitted between the front and rear rails of an upholstered furniture frame using suitable spring-retaining clips.

Once installed under the correct tension, they form a flexible foundation beneath the seat upholstery or cushion.

The terms zigzag, sinuous, serpentine and no-sag springs generally describe this type of curved-wire upholstery suspension.

Compared with traditional hand-tied coil springs, zigzag systems require less installation depth and are widely used in modern furniture manufacture.

Suitable Upholstery Applications

These 9-gauge upholstery springs are commonly used in:

• Sofa and settee seats, replacing broken or weakened seat suspension.
• Armchairs and lounge chairs, restoring support to compatible sprung seating.
• Dining chairs, creating resilient upholstered seat foundations.
• Footstools and ottomans, supporting upholstered tops.
• Upholstered benches, suitable for compatible seating frames.
• Furniture manufacture, new upholstery requiring 9-gauge zigzag suspension.

When restoring existing furniture, always match the original spring gauge, profile, length and fixing arrangement.

Choosing the Correct Spring Length

The ready-cut 9-gauge zigzag springs are available in the following lengths:

Length	Approximate metric equivalent
18"	457mm
19"	483mm
20"	508mm
21"	533mm
22"	559mm
24"	610mm
25"	635mm
26"	660mm
27"	686mm
28"	711mm
29"	737mm
30"	762mm

How to measure: Remove an undamaged original spring, press it flat and measure along its length.

Do not measure only the distance between the furniture frame rails. Zigzag springs are installed under tension, so their correct length must account for the fixing arrangement and intended spring arc.

Spring Spacing and Seat Firmness

Correct installation is essential for comfortable, supportive upholstery.

Zigzag seat springs should generally be fitted under sufficient tension to remain almost flat, with only a slight arc.

The recommended spacing is approximately 2", 3" (50, 75mm) between neighbouring springs.

Closer spacing generally produces firmer, more evenly distributed support, while wider spacing creates a softer seating foundation.

For furniture repairs, follow the original manufacturer's spring arrangement wherever practical.

Don't Forget Your Spring Clips and Bracewire

A complete zigzag spring suspension system requires suitable fixings and, where specified, connecting bracewire or cord.

We recommend checking the following complementary products:

Plastic Covered Spring Clips

Secure compatible zigzag spring ends to the furniture frame while helping reduce metal-to-metal contact and unwanted squeaking.

Paper Wrapped Stakewire

Connect and brace neighbouring springs so they work together, helping distribute loading and maintain spring alignment.

BW C-Clips

Secure compatible bracewire to the springs. For professional fitting, use the matching C. S. Osborne No. 522 BW Clip Pliers.

Zigzag Spring Tension Hooks

Connect neighbouring zigzag springs in suitable furniture suspension systems.

Always check the compatibility of springs, clips and bracing components before ordering.

Cutting and Forming Zigzag Springs

For non-standard furniture dimensions, upholstery workshops may prefer continuous spring wire that can be cut to the required length.

5 and 9 gauge.

When cutting zigzag spring wire, the new end must be correctly formed so it engages securely with the spring-retaining clip.

The C. S. Osborne No. 404 Spring End Former is made for recreating formed ends on suitable cut upholstery springs.

This specialist tool is particularly useful for furniture manufacturers and professional upholsterers regularly replacing or modifying spring lengths.

Zigzag Seat Springs Versus Superloop Back Springs

While traditional zigzag springs are commonly used in sofa and chair seats, furniture backs often require a softer, more flexible suspension.

The 11 Gauge Superloop Upholstery Springs feature larger, deeper loops that provide greater flexibility for suitable sofa and chair backs.

Select the spring construction according to the furniture's intended use rather than assuming that all serpentine springs are interchangeable.

9 Gauge Zigzag Upholstery Springs (3.6mm) provide strong, resilient support for sofa and chair seats. Also known as no-sag, sinuous or serpentine springs, they're used for furniture repairs, restoration and new upholstery.

• 9-gauge (3.6mm) steel wire, supportive seat suspension.
• 12 lengths available, from 18" to 30".
• Sold individually or in packs of 25 or 50.
• Use it for sofas, armchairs, dining chairs, footstools and upholstered benches.
• Recommended spacing: Approximately 2", 3" apart, depending on the required firmness.
• Correct measurement: Press the spring flat and measure along its length.

Complete your spring installation: Don't forget the Plastic Covered Spring Clips, Paper Wrapped Stakewire and BW C-Clips for securing and bracing your springs.

Need to cut and form springs? see the C. S. Osborne No. 404 Spring End Former.