The widely referenced ANSI/BHMA A156.17 standard for self-closing hinges and pivots, for example, specifies testing with three hinges. That works well for typical commercial doors. But what happens when your project calls for an oversized door — say, 4 feet wide, 8 feet tall, weighing over 300 pounds — and that door also needs to be fire-rated?
That’s exactly the gray area Waterson decided to address head-on.
But First, What ANSI/BHMA A156.17 Grade 1 Actually Means
ANSI/BHMA A156.17 is the industry standard for self-closing hinges and pivots. Grade 1 is the highest performance classification, designed for the most demanding commercial and institutional applications. To achieve it, a hinge must pass a rigorous battery of tests, including:
- 1,000,000-Cycle Endurance: Simulate years of heavy daily use
- Closing Force: Confirm the door self-closes reliably every time
- Latch Test (Single-Acting Doors): Verify proper latching under real conditions
- Static Load: Prove the hinge holds under sustained weight and pressure
- Vertical & Lateral Wear: Check that the hinge stays stable and precise over time
Waterson’s Series K51M-450 spring-loaded door hinges passed all five of these tests, as verified by UL Solutions (UL Taiwan Co., Ltd.) in a test conducted from February to May 2024
Results
| Clause | Description | Grade | Test result |
|---|---|---|---|
| 5.5 | Vertical and Lateral Wear | 1 | Compliant |
| 6.1 | Closing Force Test | 1 | Compliant |
| 6.2 | Cycle Test-1,000,000 cycles for Grade 1 | 1 | Compliant |
| 6.3 | Latch Test for Single Acting Doors | 1 | Compliant |
| 6.4 | Static Load Test | 1 | Compliant |
satin bronze / hinge finish
Beyond the Standard: The 4-Hinge, 8-Foot Door Test
The ANSI/BHMA A156.17 standard only covers 3-hinge doors up to 7 ft. Meanwhile, most manufacturers stop there, leaving oversized fire doors in a gray area.
NFPA 80 addresses this gap with one line: consult the manufacturer.
However, Waterson did what most don’t, and brought UL Solutions in to verify every result.
| Door Size | Weight | Higes Tested | Verified by | Outcome |
|---|---|---|---|---|
| 4 ft × 8 ft | 264.6 lb (120 kg) | 4 (DS, HS, SA, SA1) | UL Solutions | All Compliant |
Usually, that “consult the manufacturer” clause goes unanswered. In this case, Waterson has the documented data to back it up.
Read the Waterson 8ft K51M-450 BHMA Certification for further information.
Waterson UL Certifired Self Closing Door Hinges
Waterson UL certified door hinges combine the function of an overhead closer and a hinge into a single, sleek component—complete with optional hold-open and door-stop features. Designed for commercial openings, gates, and glass doors, these hinges are easy to install and adjust to meet ADA and ICC A117.1 standards for opening force, while ensuring quiet and secure closure. Crafted from durable stainless steel, they are NFPA 80 compliant, UL 3-hour fire-rated, and built to perform reliably in both interior and all-weather exterior environments. See all our features.
In addition to these performance advantages, Waterson offers custom hinge services. As a direct manufacturer, we can tailor hinge sizes, finishes, and especially hinge leaf designs to meet the specific structural needs of your doors. This makes our hinges an ideal solution for door manufacturers seeking custom options that integrate seamlessly with their existing frames.
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Please note that Waterson Closer Hinges start from a size of 4″x4″. If you’re in need of smaller self-closing hinges, we’d recommend checking out some other resources! Also, we only provide single acting closer hinges. Thank you.
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