---
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: "C$54565"
currency: NIO
in_stock: true
reviews_count: 1
url: https://www.desertcart.ni/products/116732737-3-pack-4-5-heavy-duty-adjustable-hydraulic-self-closing
store_origin: NI
region: Nicaragua
---

# Fully adjustable force & speed 2-in-1 hinge + closer 1,000,000 cycle durability 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:** C$54565
**Availability:** ✅ In Stock

## Summary

> 🚪 Elevate your door game with precision and power!

## 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?** C$54565 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/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

- • **Built to Last:** Stainless steel, weather-resistant design tested for over 1 million cycles ensures maintenance-free reliability.
- • **Precision Control:** Customize closing speed and force to fit your exact door needs—no more slams or slow shuts.
- • **Dual-Function Powerhouse:** Combines heavy-duty hinge and hydraulic door closer in one sleek unit for seamless operation.
- • **Versatile Fit for Every Door:** Supports up to 440 lbs and fits fire-rated metal, wood, glass, and gate doors—interior or exterior.
- • **Certified Safety & Compliance:** Meets ADA standards and UL Listed for peace of mind in professional and commercial spaces.

## Overview

The Waterson Heavy Duty Commercial Hydraulic Self-Closing Door Hinges 3-Pack offers a robust 2-in-1 hinge and door closer solution. Crafted from stainless steel with no hydraulic leaks, it delivers fully adjustable closing force and speed, supports doors up to 440 lbs, and is tested for 1,000,000 cycles. Ideal for a wide range of door types, it meets ADA and UL safety standards, making it the ultimate choice for professional-grade, maintenance-free door control.

## Description

WatersonHeavy Duty Commercial Fully Adjustable Hydraulic Self-Closing Door Hinges 3-Pack 4.5" x 4.5" w/o Hold Open – K51M-450-B3 (DS,HA,SA1)-Black

## 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 |
|---------------|-------|
| Material | Stainless Steel |
| Brand | Waterson |
| Product Dimensions | 4.5"L x 4.5"W |
| Finish Type | Unfinished |
| Mounting Type | Door Mount |
| Weight Limit | 440 Pounds |
| Unit Count | 3.0 Count |
| Manufacturer | Waterson |
| UPC | 755874934219 |
| Part Number | K51M-450-B3-SQ-US19-304 |
| Item Weight | 4.8 pounds |
| Country of Origin | Taiwan |
| Item model number | K51M-450-B3-SQ-US19-304 |
| Is Discontinued By Manufacturer | No |
| Size | Leaf 4.5"x4.5" Barrel ∅ 25.5 |
| Color | Black |
| Style | Auto,Adjustable |
| Finish | Unfinished |
| Item Package Quantity | 1 |
| Number Of Pieces | 3 |
| Maximum Weight Capacity | 440 Pounds |
| 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) |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Material:** Stainless Steel
- **Brand:** Waterson
- **Product Dimensions:** 4.5"L x 4.5"W
- **Finish Type:** Unfinished
- **Mounting Type:** Door Mount
- **Weight Limit:** 440 Pounds
- **Unit Count:** 3.0 Count
- **Manufacturer:** Waterson
- **UPC:** 755874934219

## 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)

## 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.

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**Shop now:** [https://www.desertcart.ni/products/116732737-3-pack-4-5-heavy-duty-adjustable-hydraulic-self-closing](https://www.desertcart.ni/products/116732737-3-pack-4-5-heavy-duty-adjustable-hydraulic-self-closing)

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*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-03-16*