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4 inch Self Close Spring Loaded Hinge, 3 Pack, Fire Rated, Full Mortise, Satin Brushed, K51M-400-A3 | Waterson Hinges
Brand: Waterson
Condition: Used
$27622
$39959
-31% Save $12337
Updated: 2 days ago
Description
ADVANCED ENGINEERING - 2 products in 1. Combines a heavy duty hinge and door closer in 1 product.
FULLY ADJUSTABLE - Complete adjustability of closing force and closing speed. Set it to close exactly how you need.
DURABLE - Stainless steel construction, no hydraulics, no leaking oil. Fully weather resistant. 1,000,000 cycles tested to provide many years of maintenance free operation.
VERSATILE - Suitable for fire-rated metal doors, interior wood doors, frameless glass openings and gate applications. Maximum loading up to 260 pounds ( 200kg). Fitting for concealed doors, interior and exterior swing doors of all kinds.
COMPLIANT - ADA, UL Listed R26997, ANSI/BHMA A156.17 Grade 1.
WATERSON Auto Door-Closer Hinge
The Waterson hinge is a hybrid conventional door closer & spring hinge. It has a built-in tension adjuster with speed control, so no more slams!
Suitable for interior & exterior openings. Easy installation with subtle balance between aesthetics & functionality. We guard your privacy behind doors, soothe the noises of slamming, & guarantee a comfortable dwelling environment.
What’s the Difference Between Hydraulic & Mechanical Hinge Types?
The difference between the two types defines how your door closes:
Hydraulic (soft-closing) type: Soft-closing; the door specifically slows down in the hydraulic zone.
Mechanical (self-closing) type: Self-closing; closing speed remains mostly average from swing to latch.
Choosing The Right Hinge Type
Scenarios where hydraulic & mechanical hinges are needed:
Hydraulic: Room is mildly windy & you don’t want your door constantly slamming. Examples: Storefront , luxury apartment, high-end villa.
Mechanical: Latching & self-closing are the only priority. No special speed adjustment needed; rapid temperature/humidity changes like outdoor environment. Examples: Five-star hotel.
Why Should I Use A Closer Hinge?
Our hinges are tested & proven. Over 1,000,000 cycles tested to provide the most durable hinge on the market, with over 20,000 installed. While there are other types of spring loaded & self closing hinges, Waterson is the only one that meets ADA requirements for pressure, speed, & latching, ensuring your door closes smoothly & safely, every time. Fewer pieces to install = less labor & lower total cost. Waterson Hinges are aesthetically appealing & less cluttered. Easier to install than concealed pivots & closers. Our hinges are great for all your door closing needs!
The Waterson hinge is a hybrid conventional door closer & spring hinge. It has a built-in tension adjuster with speed control, so no more slams!
Suitable for interior & exterior openings. Easy installation with subtle balance between aesthetics & functionality. We guard your privacy behind doors, soothe the noises of slamming, & guarantee a comfortable dwelling environment.
What’s the Difference Between Hydraulic & Mechanical Hinge Types?
The difference between the two types defines how your door closes:
Hydraulic (soft-closing) type: Soft-closing; the door specifically slows down in the hydraulic zone.
Mechanical (self-closing) type: Self-closing; closing speed remains mostly average from swing to latch.
Choosing The Right Hinge Type
Scenarios where hydraulic & mechanical hinges are needed:
Hydraulic: Room is mildly windy & you don’t want your door constantly slamming. Examples: Storefront , luxury apartment, high-end villa.
Mechanical: Latching & self-closing are the only priority. No special speed adjustment needed; rapid temperature/humidity changes like outdoor environment. Examples: Five-star hotel.
Why Should I Use A Closer Hinge?
Our hinges are tested & proven. Over 1,000,000 cycles tested to provide the most durable hinge on the market, with over 20,000 installed. While there are other types of spring loaded & self closing hinges, Waterson is the only one that meets ADA requirements for pressure, speed, & latching, ensuring your door closes smoothly & safely, every time. Fewer pieces to install = less labor & lower total cost. Waterson Hinges are aesthetically appealing & less cluttered. Easier to install than concealed pivots & closers. Our hinges are great for all your door closing needs!
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Product Details
- SKU:
- awhd-us-b07jnlfcjr
- Model:
- K51M-400-A3-SQ-US32D-304
- Country:
- US
- ASIN:
- B07JNLFCJR
- UPC:
- 755874933854
Shopping Smarter
Common questions about buying open-box and refurbished.
Why buy refurbished or open-box?
Refurbished and open-box products offer the same performance as new at a fraction of the price. You're already saving $123 on this listing. They've been inspected, tested, and are ready to use — the only difference is the price tag. Buying refurbished also reduces electronic waste, extending product life cycles and keeping functional devices out of landfills.
What's the difference between open-box and refurbished?
Open-box products are customer returns that have been inspected and confirmed functional. They may show little to no use — often the item was returned simply because the buyer changed their mind. Refurbished products have been professionally repaired or restored by technicians, tested to meet or exceed manufacturer specifications, and sometimes come with a warranty. Both are a smart alternative to buying new.
Why use OpenBoxFox?
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Yes. Products listed on OpenBoxFox come from established retailers like Amazon, Reebelo, and Dyson — not unknown third-party sellers. Each retailer has buyer protection policies, return windows, and in some cases warranties. You get the price advantage of used goods with the purchase security of a known retailer.
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