Hinges
Full Mortise Hinge — 4 Ball Bearing
BH-FM-4BB
Full mortise, square-corner hinge with five knuckles and four ball bearings in 304 grade stainless steel, with a non-removable pin. UL-listed for 3-hour fire doors and ANSI/BHMA Grade 1.
Specifications
| Parameter | Value |
|---|---|
| Design | 5 knuckles · 4 ball bearings |
| Material | 304 Grade Premium Stainless Steel |
| Type | Full mortise, square corner |
| Pin | Non-removable (enhanced security) |
| Max load | Up to 120 kg |
| Standards | UL 10C (fire rating 3 hours) · NFPA 80 (fire safety) · ANSI/BHMA A156.18 (finishes) · ANSI/BHMA A156.1 Grade 1 (performance) |
| Sizes (H × W × T) | 4.0" × 4.0" × 3.4 mm · 4.5" × 4.0" × 3.4 mm · 4.5" × 4.5" × 3.4 mm |
| Finishes | Matt Chrome |
Technical Documents
Datasheets, CAD files and finish samples are available on request.
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