Standard Bonnell Spring Units
Standard Bonnell Spring Units are most widely used spring interior for mattresses in the world.
RED Springs manufacures a wide variety of options. All Standard Bonnell Spring Units are heat-treated under controlled conditions for better resistance and durability. This ensures that each component part of the unit-helicals as well as springs are stress-relived and strengthened, thereby eliminating sag or set of springs.
Units can be supplied unframed fitted with a frame options, hardened and tempered flat steel strip.
Standard Bonnell Spring Units are also available in variety of specification use as box springs.
Advantage

Bonnell spring diameter Ø | 82-94 mm | 2.20 mm |
Bonnell spring diameter Ø | 83-94 mm | 2.30 mm |
Bonnell spring diameter Ø | 83-94mm | 2.40 mm |
Bonnell spring height 4 turns | 85-110 mm | 2.20 mm / 2.30 mm / 2.40 mm |
Bonnell spring height 5 turns | 125-145 mm | 2.20 mm |
Bonnell spring height 5 turns | 125-135 mm | 2.30 mm / 2.40 mm |
Bonnell spring unit Frame specification |
8x1.4 mm; 10x1.4 mm | |
Top; Top/Bottom; | ||
Available without frame |
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Bonnell spring unit packaging R | Roll packed (5-10 units in a roll) |
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Helical wire Ø | 1.30 mm | |
Coils per m2 | 100-120 | |
Felt – optiona | 500 gr2-800 gr2 |