Biconcial Coil Spring
Biconcial Coil Spring
SKU:SB94
3 available now
- This item typically ships within 14 days when pre-ordered.
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Biconical (aka hourglass or coil) springs are placed inside a frame by secured onto jute webbing, rails or onto a wooden base. The top of the springs compressed and tied together with jute twine, &/or sewing onto hessian. Use a large curved needle for sewing jute webbing. Place a layer of felted spring pad on top of the springs, and under the stuffings. (webbing, twine, hessian, pad and stuffings sold separately).
What gauge of spring? Use 9g coil springs for seats, and 10g for backs.
What height spring? The height of the spring has many different factors, but here is a general rule of thumb -- measure the height of the side frame and add 10-12cm. For instance, if the frame is 8cm high, buy a spring about 18-20cm.
How much should I compress the spring? Press the spring down with your hand. When you feel the spring starting to resist, that is the height to tie it off at. Basically, you want to compress it enough to give you enough resistance on the top padding and fabric, but not so much that it starts to force the bottom out.
HANDY HINT: If a coil spring is worn out or broken, it must be replaced. A worn spring can be tested by setting the spring on a table and pressing it down with the flat of your hand. Replace the spring if it begins to sag to one side.
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Frequently Asked Questions
Order Processing
In-stock items: Our goal is to dispatch in-stock items within 2-5 working days, but our turnaround time is typically faster than that.
Backorder:Â This means its not in stock but we will order this in for you. The estimated dispatch time for the out-of-stock item is typically written on the product page.
Shipping Fees & Options
We ship to NZ and AUS. Most standard orders have calculated shipping fees at checkout.
Large or bulky orders may incur additional shipping fees, and we'll contact you to discuss options and extra costs.
Certain items are NZ only and/or pickup only due to size, hazard, or other delivery restrictions.
Not all delivery options are visible for every product to every locations.
Economy Courier:Â We will send your parcel by the cheapest courier to your location using either Castle Parcels, Post Haste, Aramex or NZ Post.
NZ Post:Â We will courier your parcel only via NZ Post.
Oversized order:Â Shipping surcharge may apply, in addition to amount already paid.
Oversized item:Â Shipping options and costs will be discussed with you, or item may need to be picked up.
Delivery Times
Our target delivery* estimates are:
- Auckland 1-3 working days
- North Island 2-4 working days
- South Island 3-6 working daysÂ
- Allow extra 1-4 working days for non-urban &/or rural deliveries
- Australia 1-3 weeks
*Delivery times may vary depending on your exact location. Delays can occur within the courier networks during peak times.
Change of Mind Returns
Eligible products can be returned within 30 days of the purchase.
View our Returns & Refunds policy for more details on change of mind returns.
Images, Sizing, Finishes, Manufacturing
Please note: screen colors may not accurately depict actual colors.
Screen images serve as a guide, and like-named colors or finishes may not be an exact shade match.
Please note that due to the nature of manufacturing processes, measuring instruments and measurement unit conversion, from time to time product sizing may vary slightly.
Common finish abbreviations:
AB:Antique Brass

AC:Antique Copper
AG:Antique Gold

AN:Antique Nickel

AS:Antique Silver
AT:Antique Tin

BAB:Brushed Antique Brass
BKN:Black Nickel
BN:Brushed Nickel

BP:Brass Plate

BR:Brown
CRYSTAL:Crystal
CP:Copper Plate

GBK:Gloss Black

GM:Gun Metal

GP:Gold Plate
MG:Matte Gold

MULTI-COLOR:Multi-Color
MBK:Matte Black
NM:Nickel Matte

NP:Nickel Plate

OEB:Old English Brass

RG:Rose Gold
RU:Rust

SB:Solid Brass

SP:Silver Plate

SS:Stainless Steel

ZP:Zinc Plate