Bonnell spring systems are the most traditional type of innerspring used for mattress.
The Bonnell coil has an hour glass shape ( wider at the bottom and the top than the middle )
And is interconnected with a mesh of metal to make the spring system.
Specifications:
Helical wire diameter 1.30mm-1.50mm.
Coils per m : 100-225 unit.
Bonnell spring end ring : 62mm- 95mm.
Bonnell spring wire diameter 1.80mm-2.40mm.
Bonnell spring turns: 4-7 turns.
Bonnell spring height 70-21mm.
Frame : round wire 4.5mm-5.00mm.
Packing : Press packed (with frame, 15-25 unit per pallet pack ).
Or roll packed ( without frame, 5-15 unit per roll ).
