--- product_id: 116732737 title: "3 Pack 4.5\" Heavy Duty Adjustable Hydraulic Self Closing Door Hinges, Fire Rated, Full Mortise, Black - K51M-450-B3 | Waterson Hinges" brand: "waterson" price: "β‚©1209455" currency: KRW in_stock: true reviews_count: 1 category: "Waterson" url: https://www.desertcart.kr/products/116732737-3-pack-4-5-heavy-duty-adjustable-hydraulic-self-closing store_origin: KR region: South Korea --- # Fire rated & UL listed Fully adjustable force & speed 2-in-1 hinge + closer 3 Pack 4.5" Heavy Duty Adjustable Hydraulic Self Closing Door Hinges, Fire Rated, Full Mortise, Black - K51M-450-B3 | Waterson Hinges **Brand:** waterson **Price:** β‚©1209455 **Availability:** βœ… In Stock ## Summary > πŸšͺ Elevate your door game with the ultimate self-closing hinge innovation! ## Quick Answers - **What is this?** 3 Pack 4.5" Heavy Duty Adjustable Hydraulic Self Closing Door Hinges, Fire Rated, Full Mortise, Black - K51M-450-B3 | Waterson Hinges by waterson - **How much does it cost?** β‚©1209455 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/116732737-3-pack-4-5-heavy-duty-adjustable-hydraulic-self-closing) ## Best For - waterson enthusiasts ## Why This Product - Trusted waterson brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Dual-Function Engineering:** Combines heavy-duty hinge and hydraulic self-closing in one sleek unit for seamless door control. - β€’ **Precision Closing Control:** Customize closing speed and force effortlessly to match your exact door operation needs. - β€’ **Versatile Fit for Any Door:** Supports fire-rated metal, wood, glass, and gates up to 440 lbsβ€”perfect for any professional space. - β€’ **Certified Safety & Compliance:** Meets ADA, UL R26997, and ANSI/BHMA Grade 1 standards for trusted, code-compliant installations. - β€’ **Built to Last a Million Cycles:** Stainless steel, oil-free hydraulic design ensures weather resistance and maintenance-free durability. ## Overview The Waterson 3 Pack 4.5" Heavy Duty Adjustable Hydraulic Self Closing Door Hinges combine a robust hinge and hydraulic door closer in one, offering fully adjustable closing speed and force. Crafted from stainless steel with no leaking hydraulics, these fire-rated, UL-listed hinges support doors up to 440 lbs and are tested for 1,000,000 cycles, ensuring long-lasting, maintenance-free performance across diverse door types. ## Description 3 Pack 4.5" Heavy Duty Adjustable Hydraulic Self Closing Door Hinges, Fire Rated, Full Mortise, Black - K51M-450-B3 | Waterson Hinges - desertcart.com Review: Excellent solution - I have a door with an arched top and could not use a conventional door closer unless we had a special mounting bracket fabricated, which would detract from the aesthetics of the door and frame. This solution was very simple to install and is barely noticeable (the hinge knuckles are considerably larger than a conventional hinge). However, I did find that adjusting the swing and closing speeds was difficult to do because I found the enclosed instructions very confusing. ## Features - 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 440 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. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07JPZDMNS | | Best Sellers Rank | #451,718 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,986 in Door Hinges | | Brand | Waterson | | Brand Name | Waterson | | Color | Black | | Customer Reviews | 4.7 out of 5 stars 4 Reviews | | Finish Type | Unfinished | | Finish Types | Unfinished | | Hole Count | 4 | | Included Components | 3mm & 5mm hex wrench, For wood door - Crosshead self-tapping screws (SUS#12-24 UNC-1/2"L), For metal door - Crosshead machine screws (SUS#12x1-1/4"(31.75mm)L) | | Item Dimensions L x W | 4.5"L x 4.5"W | | Item Weight | 4.8 Pounds | | Manufacturer | Waterson | | Manufacturer Part Number | K51M-450-B3-SQ-US19-304 | | Material | Stainless Steel | | Material Type | Stainless Steel | | Maximum Weight Capacity | 440 Pounds | | Model Number | K51M-450-B3-SQ-US19-304 | | Mounting Type | Door Mount | | Product Dimensions | 4.5"L x 4.5"W | | UPC | 755874934219 | | Unit Count | 3.0 Count | ## Product Details - **Brand:** Waterson - **Color:** Black - **Finish Type:** Unfinished - **Hole Count:** 4 - **Material:** Stainless Steel - **Mounting Type:** Door Mount - **Number of Items:** 3 - **Product Dimensions:** 4.5"L x 4.5"W - **Unit Count:** 3.0 Count - **Weight Limit:** 440 Pounds ## Images ![3 Pack 4.5" Heavy Duty Adjustable Hydraulic Self Closing Door Hinges, Fire Rated, Full Mortise, Black - K51M-450-B3 | Waterson Hinges - Image 1](https://m.media-amazon.com/images/I/61U0nGwt-GL.jpg) ![3 Pack 4.5" Heavy Duty Adjustable Hydraulic Self Closing Door Hinges, Fire Rated, Full Mortise, Black - K51M-450-B3 | Waterson Hinges - Image 2](https://m.media-amazon.com/images/I/412M1KqI7oL.jpg) ![3 Pack 4.5" Heavy Duty Adjustable Hydraulic Self Closing Door Hinges, Fire Rated, Full Mortise, Black - K51M-450-B3 | Waterson Hinges - Image 3](https://m.media-amazon.com/images/I/61skuF-239L.jpg) ![3 Pack 4.5" Heavy Duty Adjustable Hydraulic Self Closing Door Hinges, Fire Rated, Full Mortise, Black - K51M-450-B3 | Waterson Hinges - Image 4](https://m.media-amazon.com/images/I/51+YS9+GwGL.jpg) ![3 Pack 4.5" Heavy Duty Adjustable Hydraulic Self Closing Door Hinges, Fire Rated, Full Mortise, Black - K51M-450-B3 | Waterson Hinges - Image 5](https://m.media-amazon.com/images/I/71702HwWPJL.jpg) ## Available Options This product comes in different **Color** options. ## Customer Reviews ### ⭐⭐⭐⭐ Excellent solution *by K***S on September 16, 2022* I have a door with an arched top and could not use a conventional door closer unless we had a special mounting bracket fabricated, which would detract from the aesthetics of the door and frame. This solution was very simple to install and is barely noticeable (the hinge knuckles are considerably larger than a conventional hinge). However, I did find that adjusting the swing and closing speeds was difficult to do because I found the enclosed instructions very confusing. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.kr/products/116732737-3-pack-4-5-heavy-duty-adjustable-hydraulic-self-closing](https://www.desertcart.kr/products/116732737-3-pack-4-5-heavy-duty-adjustable-hydraulic-self-closing) --- *Product available on Desertcart South Korea* *Store origin: KR* *Last updated: 2026-08-19*