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ANSI BHMA Grade 1 4BB Heavy Duty Fire Rated Butt Door Hinge
- Product Information
SSS
PSS
MB
ANSI BHMA Grade 1 4BB Heavy‑Duty Fire Rated Butt Door Hinge
ANSI/BHMA Grade 1 heavy‑duty 4‑BB fire rated butt hinge, cycle‑tested to 2,500,000 cycles complying with ANSI/BHMA A156.1. UL Listed UL 10C, 3‑hour fire‑rated. Enhanced four‑ball‑bearing for extra heavy‑load high‑traffic doors. Five‑knuckle full mortise square corner hinge, optional NRP non‑removable pin. WINGTEC is reliable China Manufacture, China Factory and China Supplier for ANSI fire rated hinges.
Product Specification
Technical Parameter
| Item | Parameter |
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Application Scenarios
Heavy‑Duty Fire‑Rated Door Assembly
Meets NFPA 80 requirement, certified for extra heavy‑load fire‑rated wood and hollow‑metal door openings.
Extra‑High‑Traffic Institutional Premises
4‑BB reinforced bearing design, ideal for hospitals, schools and facilities with frequently operated heavy‑weight doors.
Institutional & Commercial Hardware Projects
Bulk wholesale supply for office buildings, multi‑family complexes and hardware contractors.
Product Characteristics
ANSI/BHMA A156.1 Grade 1 certified, heavy‑duty 2,500,000‑cycle performance test
UL Listed UL 10C 3‑Hours Fire Rated, UL File No. R42033
Reinforced 4‑BB four ball‑bearing construction for higher load‑bearing capacity, quieter and longer‑life performance for extra‑heavy‑weight doors
Five‑knuckle full mortise square‑corner template hinge; template hole layout fits wood & hollow‑metal door‑frames
Optional NRP non‑rising non‑removable pin for enhanced building security
Stainless steel 201 / 304 / 316 optional; available finishes SSS / PSS / MB
China factory direct supply, stable quality for high‑grade commercial architectural hardware projects
Warranty & Customization
Quality guarantee against manufacturing defects.
Custom finish, packaging and private label available for large‑volume orders.
Frequently Asked Questions
What is the difference between 4‑BB and 2‑BB hinge?
4‑BB stands for four ball‑bearing assemblies. Compared with standard 2‑BB hinges, it provides higher load‑bearing capacity, smoother movement and extended service life, specially recommended for extra‑heavy‑weight and very‑high‑frequency commercial doors.
Can I select different stainless steel grades and NRP pin for this hinge?
Yes, 201, 304 and 316 stainless steel are available alternatives. NRP non‑removable pin can be ordered as optional upgrade. Standard finishes include SSS, PSS and MB.
Can I buy these Grade 1 heavy‑duty 4‑BB fire‑rated butt hinges wholesale from WINGTEC?
Yes, WINGTEC is China Manufacture, China Factory and China Supplier for ANSI/BHMA fire rated door hinges and architectural door hardware.
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