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  • Heavy‑duty concealed bottom pivot and floor spring with 304 stainless finish and center‑pivot mounting baseDiagram showing three closing zones—85°–70° fixed, 70°–25° adjustable, 25°–0° adjustable—with assisted hold at 90° and 270°

    Heavy‑Duty Concealed Bottom Pivot + Floor Spring Set | Center Pivot | 2D Adjustable Base | 90°/270° Hold | 360° Max Opening | Up to 400 kg | APS2039

    • Materials: steel main body with 304 stainless finish; forged bearing‑steel camshaft
    • Geometry: center‑pivot placement; 2D adjustable base (radial + axial)
    • Operation: assisted hold at 90° and 270°; 360° maximum opening; small‑angle latching force
    • Closing control:
      • 85° → 70° fixed (non‑adjustable)
      • 70° → 25° adjustable (valve 1)
      • 25° → 0° adjustable (valve 2)
    • Door compatibility: double‑acting wood or metal doors; minimum thickness ≥60 mm
    • Capacities (by option):
      • Up to 300 kg, reach ≤1200 mm, EN5 closing torque
      • Up to 400 kg, reach ≤1350 mm, EN6 closing torque
    • Reference dimensions (bottom unit): body length approx. 270–310 mm; base length ~160 + 103 mm; body width ~40–45 mm; base height ~26 mm
    • Optional: heavy‑duty adjustable top pivot/upper seat (304 stainless, forward/inverted install, left/right + in/out micro‑adjust, concealed wire hole, 15 mm precision‑cast shaft)
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