---
product_id: 116732388
title: "3 Pack 4.5 Inch Heavy Duty Commercial Self Closing Door Hinge, UL Listed Fire Rated, Stainless Steel, Satin Brushed - K51M-450-A3 | Waterson Hinges"
brand: "waterson"
price: "4038 Lei"
currency: RON
in_stock: true
reviews_count: 3
url: https://www.desertcart.ro/products/116732388-3-pack-4-5-inch-heavy-duty-commercial-self-closing
store_origin: RO
region: Romania
---

# Adjustable Closing Force & Speed Weather-Resistant Stainless Steel UL Listed Fire Rated Grade 1 3 Pack 4.5 Inch Heavy Duty Commercial Self Closing Door Hinge, UL Listed Fire Rated, Stainless Steel, Satin Brushed - K51M-450-A3 | Waterson Hinges

**Brand:** waterson
**Price:** 4038 Lei
**Availability:** ✅ In Stock

## Summary

> 🚪 Elevate your entryway with precision-engineered, fire-rated hinges that mean business.

## Quick Answers

- **What is this?** 3 Pack 4.5 Inch Heavy Duty Commercial Self Closing Door Hinge, UL Listed Fire Rated, Stainless Steel, Satin Brushed - K51M-450-A3 | Waterson Hinges by waterson
- **How much does it cost?** 4038 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/116732388-3-pack-4-5-inch-heavy-duty-commercial-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:** Heavy-duty, weather-resistant stainless steel construction designed for enduring commercial use.
- • **Precision Control:** Digital panel tension locking ensures consistent, reliable door operation every time.
- • **Tailored Performance:** Fully adjustable closing force and speed to perfectly suit your environment’s needs.
- • **Integrated Smart Engineering:** Combines door closer, spring hinge, and optional hold-open in one sleek, unobtrusive unit.
- • **Certified Safety & Compliance:** UL Listed and ADA compliant for peace of mind in any commercial setting.

## Overview

This 3-pack of 4.5-inch heavy-duty commercial self-closing door hinges by Waterson features UL Listed fire-rated Grade 1 certification, ADA compliance, and a satin brushed stainless steel finish. Designed for durability and precision, these hinges offer fully adjustable closing force and speed, digital tension locking, and weather-resistant construction, making them ideal for demanding commercial environments.

## Description

Full description not available

## Features

- CERTIFICATION | ADA, UL compliant Grade 1
- ADVANCED ENGINEERING | Combining door closers, spring hinges and an optional hold open feature into one attractive & unobtrusive component.
- FULLY ADJUSTABLE | Closing force and speed adjustable according to environment needs.
- PRECISION | Digital panel tension locking capability.
- DURABLE | Fully weather resistant stainless steel construction -- purely mechanical, NO LEAKING.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material | Stainless Steel |
| Brand | Waterson |
| Product Dimensions | 4.5"L x 4.5"W |
| Finish Type | Brushed |
| Mounting Type | Door Mount |
| Weight Limit | 2.6E+2 Pounds |
| Unit Count | 3.0 Count |
| Color | Satin Brushed |
| Manufacturer | Waterson |
| UPC | 755874933649 |
| Part Number | K51M-450-A3-SQ-US32D-304 |
| Item Weight | 4.8 pounds |
| Item model number | K51M-450-A3-SQ-US32D-304 |
| Is Discontinued By Manufacturer | No |
| Size | 4.5"x4.5" |
| Style | Auto |
| Finish | Brushed |
| Pattern | SA + SA + SA1 (without hold-open function) |
| Number Of Pieces | 3 |
| Maximum Weight Capacity | 2.6E+2 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:** Brushed
- **Mounting Type:** Door Mount
- **Weight Limit:** 2.6E+2 Pounds
- **Unit Count:** 3.0 Count
- **Color:** Satin Brushed
- **Manufacturer:** Waterson
- **UPC:** 755874933649

## Images

![3 Pack 4.5 Inch Heavy Duty Commercial Self Closing Door Hinge, UL Listed Fire Rated, Stainless Steel, Satin Brushed - K51M-450-A3 | Waterson Hinges - Image 1](https://m.media-amazon.com/images/I/61X4A9u7uSL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Please let me know what model #'s these are? I maybe interested in 2 sets**
A: Dear sir, these are model #K51M-450-630. Welcome to contact us for detailed specifications.  https://watersonusa.com/contact-us. Thank you. :)

**Q: Are these hinges strong enough to slow the door to a reasonable speed if someone tries to slam it shut out of anger?**
A: I believe so, they are very sturdy.  We purchased them for a school so that preschool student fingers would not be injured from the door shutting too fast.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great!!!
*by G***Y on February 19, 2020*

Great product! Used them on a heavy gate and they worked perfectly.

### ⭐⭐⭐⭐ Work well, seem temperature sensitive.
*by O***P on November 8, 2022*

I have an arched door that my contractor said couldn’t have a door closure attached. After some research, he came back with a $1500. solution of a door closure that has an adapter that allows it to mount near the crest of the arch. But it was still big and kinda funky for this door. Plus, that’s crazy high for a door closure.I tried Bommer hinges but they were not adjustable and closed too hard.These are adjustable for the open tension and the closing resistance.These are also adjustable for the closing pressure for the last 20degrees of the door closing.I would have given it 5 stars after spending an hour getting it perfectly adjusted. I was amazed and wondered why my contractor and architect didn’t know about these.But they lost a star because if found that when the temperature changes (which it does frequently) the tension changes.They still work great, but I’d like to set it and not worry about the temp change.

### ⭐⭐ Not heavy duty commercial material, maybe commercial
*by M***S on May 25, 2022*

This set of (3) hinges were installed on a 3 point lock system door where a door closer on the inside doesn’t allow the door to fully open and a closet on the outside would look bad. After replacing all hinges with this set the door didn’t close and I already told the customer this product was going to solve both issues, functionality and looks. Now I ordered a dumper closer device that cost me 125 each to make the doors close as I’m not removing the hinges to install a closer outside and give my customer the opposite of promised.

## Frequently Bought Together

- Waterson Heavy Duty Commercial Fully Adjustable Self-Closing Door Hinges 3-Pack 4.5" x 4.5" – K51M-450 (SA,SA,SA1) -Satin Brushed
- Amazon Basics Self-Closing Door Hinge, 3.5 Inch x 3.5 Inch, 1 Piece, Oil Rubbed Bronze
- HOSOM Self Closing Door Hinge, Spring Hinge, 4 Inch, Adjustable Tension for Garage, Front Door, Back Door, UL Listed, for Left and Right Hand Door, 5/8'' Radius Corners, Brushed Nickel, 4 Pack

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-26*