Bonnell coils are the oldest and most common. First adapted from buggy seat springs of the 19th century, they are still prevalent in less expensive mattresses. Bonnell coils are hourglass-shaped, and the ends of the wire are knotted or wrapped around the top and bottom circular portion of the coil and self-tied. Our Bonnell spring produced by automatic spring coiling machine, spring coils with stable quality, profestional design provide different firmness; spring coils with heat treated high carbon wire gives good surport to your mattress! Bonnell spring specifications required as below: A- head-diameter; (60 90mm) B- height; (80 120mm) C- wire thickness; (1.4 2.4mm) D- turns; (4 7turns) E- mid-diameter; (30-80mm) Bonnell spring spcecs range: wire standard: GB#70 wire thickness: 1.8mm 2.4mm; height: 8cm 18cm; head diameter: 60mm 90mm; middle diameter: 30mm 55mm; turns: 4 6turns Bonnell Spring has been presented above, want more similar products, please click mattress spring,Bonnell Spring,bed spring. Category: Bonnell Springs Related Category: Support Springs
