Spring band bolt for T30 / T90 fire doors Total length: 160 mm Diameter: 19 mm Spring band adjustment The spring bolts must be tensioned so that the door closes independently from an opening angle > 30°. Suitable for: Hörmann H8-5, Quadro and MZ Teckentrup HT8-D, T30 FSA-42, T30 FSA-62 and T90 FSA-62. Spring Band Bolt Diameter 19 mm for Fire Doors Spring band bolt for fire doors T30 and T90.