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ANSI BHMA Grade 1 SS304 4BB Fire Rated Butt Door Hinge
- Product Information
SSS
PSS
MB
ANSI BHMA Grade 1 SS304 4BB Fire Rated Butt Door Hinge
ANSI/BHMA Grade 1 SS304 4‑BB four ball‑bearing 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. SS304 stainless steel main material, five‑knuckle full mortise square corner hinge, multiple standard sizes available. Optional NRP non‑removable pin for security upgrade. WINGTEC is reliable China Manufacture, China Factory and China Supplier for ANSI fire rated hinges.
Product Specification
Technical Parameter
| Item | Parameter |
|---|
Application Scenarios
Heavy‑Duty Fire‑Rated Door Assembly
Meets NFPA 80 requirement, certified for high‑traffic fire‑rated wood and hollow‑metal door openings.
Extra‑Heavy Load Commercial Premises
4‑BB four ball‑bearing design, preferred for hospitals, schools, facilities with heavy‑weight, frequently operated 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
4‑BB four ball‑bearing structure for enhanced load‑bearing capacity, quieter and longer‑life heavy‑door operation
SS304 as primary material; 201 / 316 stainless steel available as alternative options
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
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 4‑BB four ball‑bearing Grade 1 hinge?
4‑BB means four ball‑bearing assemblies inside knuckle. Compared with standard 2‑BB hinge, it delivers higher load‑bearing capacity, smoother movement and extended service life for heavy‑weight, high‑frequency commercial doors. ANSI Grade 1 is the highest commercial hinge grade validated by 2,500,000‑cycle test.
Can I choose different stainless steel grades and NRP pin?
Yes, SS304 is standard, 201 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 SS304 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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