The Bonnell is the classic spring unit,and had,through the years,proven its worth.
This spring is hour glass shaped with knotted end rings at top and bottom front sides.
A round helical wire connects each single spring along a line either head to toe or side to side. A border wire support goes around the perimeter clipped to each spring on the outer edge of the unit.

Springs normally range form 100mm- 170 mm in height with 150mm being the average. 100mm springs are mainly used in sofa beds. The construction of the Bonnell spring unit shows a so-called progressive resiliency: when little weight is applied,the mattress with the tailed springs is softer because the resistance is still low. T
hen,when more weight is applied,the resistance to the body weight is higher and is increased with the degree of the compression. The number of springs is one of the key quality characteristics.

Bonnell spring units:

are a reasonably priced high quality spring system used in medium quality mattresses

provide excellent support and comfort

3-4 gauges of wire available

the original spring system and still one of the best.


Bonnell 312 Twin 36.5"x73" 5.25" 9X24 216 2.2mm 6gauge
Bonnell 312 Twin XL 36.5"x78" 5.25" 9X26 234 2.2mm 6gauge
Bonnell 312 Full 51.5"x73" 5.25" 13X24 312 2.2mm 6gauge
Bonnell 312 Full XL 51.5"x78" 5.25" 13X26 338 2.2mm 6gauge
Bonnell 312 Queen 58.5"x78" 5.25" 15X26 390 2.2mm 6gauge
Bonnell 312 King 74.5"x78" 5.25" 18X26 468 2.2mm 6gauge
Bonnell 312 CA. King 70.5"x82" 5.25" 17X27 459 2.2mm 6gauge

Bonnell 336 Twin 36.5"x73" 5.25" 10X24 240 2.3mm 6gauge
Bonnell 336 Twin XL 36.5"x78" 5.25" 10X26 260 2.3mm 6gauge
Bonnell 336 Full 51.5"x73" 5.25" 14X24 336 2.3mm 6gauge
Bonnell 336 Full XL 51.5"x78" 5.25" 14X26 364 2.3mm 6gauge
Bonnell 336 Queen 58.5"x78" 5.25" 16X26 416 2.3mm 6gauge
Bonnell 336 King 74.5"x78" 5.25" 20X26 520 2.3mm 6gauge
Bonnell 336 CA. King 70.5"x82" 5.25" 18X27 486 2.3mm 6gauge

Bonnell 364 Twin 36.5"x73" 5.25" 10X26 260 2.4mm 6gauge
Bonnell 364 Full 51.5"x73" 5.25" 14X26 364 2.4mm 6gauge
Bonnell 364 Queen 58.5"x78" 5.25" 16X28 448 2.4mm 6gauge
Bonnell 364 King 74.5"x78" 5.25" 20X28 560 2.4mm 6gauge