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  • What Is a Flag Hinge?

    A flag hinge is a piece of hardware used to allow movement of two pieces of material. They are commonly used on various types of doors to facilitate directional movement; the flag hinge itself is usually mounted on a vertical plane, thereby allowing horizontal movement of a door or other piece of ma


    ACCESS CONTROL SYSTEMS Are classified under the same classifications as the doorhardware in/on which they are integrated .This means thatthe access control systems supplied by GBM Solutions isclassified according to EN1303 –cylinder for locks ,DINEN 18252 –locking cylinder for door locks

  • Acceptable Quality Limit(AQL) Standard

    Quality StandardsWe use the internationally recognized Acceptable Quality Limit (AQL) standard for all product inspections. For each inspection, this allows the client to set their acceptable quality tolerance levels.Acceptable Quality Limit (AQL)D&D Inspectors exclusively use ISO 2859 tables to mea



  • Composition Effects on The Magnetic Permeability of Austenitic Stainless Steels

    IntroductionAustenitic stainless steels are generally non-magnetic with magnetic permeabilities of around 1.0. Permeabilities above 1.0 are associated with the amount of either ferrite or martensite phases present in the 'austenitic' steel and so depend on:chemical composition· cold work

  • How to Clean Brass Hinges

    Keeping brass hinges shiny and clean is very important. But over time, they might acquire a bit of grime or tarnish. Do you want to clean brass hinges by yourself? Now there are six ways which can help you clean them. 1. Wipe the brass hinge with soapy water.Mix hot water with a few drops of liquid

  • Door Hinges for Door System First

    Door hardware has a very important position in the modern complex function construction project. Door hinges for door system first.Now let's talk about what problems we should pay attention to in the process of installing the hinge.1. Simply understand the structure of the hingeThe most popular and

  • Stainless Steel Materials

    The principle material used in D&D Hardware products is Stainless Steel. Other material such as brass, zinc alloy or other material are also used for specific site requirements or aesthetic reasons.D&D products are manufactured from a high corrosion resistant Chrome-Nickel Stainless Steel combinatio

  • Frequency of Door Usage and Standard for Lock

    Guidelines for frequency of door usage and standard for lock
    Build type
    Daily usage
    Yearly usageStandard for lock
    High frequency & Heavy weight door
    Large department store entrance

    ANSI standard
    Hospital corridor and surgical

  • How to identify Stainless Steel 304 Grade or 316 Grade?

    When selecting stainless steel hardware, it is important to understand the differences between the variety of grades and finishes available so you can choose the products that will work most safely and effectively for your purposes. It’s difficult to distinguish between these two types of steel visually, but significant differences between the two steel types do exist and are important to understand.Below is a basic guide to the similarities and differences of 304 grade and 316 grade stainless steel.1. CompositionThe first key difference between 304 grade stainless steel and 316 grade stainless steel relates to composition. Steels are classified in part based on chromium and alloy content and crystalline structure. Austenitic steel – also known as 300 series steel – contains 18% chromium and 8% nickel. This type of steel is incredibly common; about 70% of stainless steel products are composed of austenitic steel. 304 grade stainless steel is considered to be austenitic, while 316 grade

  • Is stainless steel 304 non-magnetic?

    It is commonly stated that “stainless steel is non-magnetic”. This is not strictly true and the real situation is rather more complicated. The degree of magnetic response or magnetic permeability is derived from the microstructure of the steel. A totally non-magnetic material has a relative magnetic

  • How to Select Stainless Steel?

    Selection of Stainless Steel Suitable for Environment

  • Global Door Handle Market

    The report is mainly discussed the Global Door Handle Market for taking the export and import data as well as the present industry chain & growth and development of supply and demand of Door Handle into consideration. It estimates the manufacture capacity, properties of demand and supply, detail ana

  • Global Door Hinge Market Report 2017

    Door Hinge MarketReport provides complete information about manufacturers, suppliers, distributors, traders, customers, investors and major types as well as applications. Door Hinge Market is segmented based on type, application, and region. The Door Hinge Market report provides an in-depth overview

  • Global Door Closer Market 2017-2021

    The door closer market has been witnessing growth across regions due to the increasing awareness of high-tech security systems among various end-users and easy operations of such equipment. Also, there has been an impact in the market due to the deployment of smart solutions in the developed and dev

  • How Fire Rated Door Hardware protect Human Safety?

    we know that there is not a door hardware products are working alone, only the cooperation of each product to make the fire door work smoothly, and make comprehensive fire safety solutions for construction of buildings to prevent the happening of the tragedy at the most extent.

  • How to choose the appropriate door hinge?

    Material selection the hingeDoor hinge is the most common door fitting device that connects the door frame to the door leaf and allows rotation between the two. The hinge can withstand the weight of the door without sagging the door, and allows the door to rotate freely for a long time under the low

  • How to choose the Hinge?

    How to Choose the Hinge?
    The appropriate specification and correct selection of hinges is crucial to their performance and depends on the following factors;
    1. Is it a fire, smoke or emergency escape door?
    2. How heavy is the door and what are the door dimension(height, width and thickness)?

  • How to choose the fire rated door hardware?

    Fire has always been a hidden danger in our lives, so now many public places and families will be equipped with stainless steel fire doors, so that in the event of fire, we can better ensure the safety of our lives. Now let's get to know the characteristics of metal fire door and the selection guide

  • Fire Rated Door Hardware Specification Configuration Principle

    As we all know, fire rated hardware is the heart of a fire rated door. The normal open and close of the door is inseparable from the tacit cooperation of each fire rated hardware accessory. If a fire rated door is not used with a complete door system, it cannot pay a role as a door. We will explain

  • What is the difference between non fire rated and fire rated door hardware?

    There can be confusion in the marketing of door hardware when it comes to products that are "fire rated". When you scan through a suppliers catalog you will often find the notation that the hardware is "fire rated". But non fire rated door Hardware and fire rated door Hardware are two different types of door device.

  • 240 minute / 4 hour fire rated door hardware

    Fire rated doors are required in numerous areas of a commercial buildings. Metal fire doors can attain ratings up to 3 hours where wood fire doors can be rated up minutes. Not all doors in a commercial building need to be fire rated. Fire rated door requirements are typically determined by the fire

  • 2 hours fire rated door

    1 Hour Fire Door and 2 Hour Fire Door TestingThe performance of 1 hour or 2 hour fire doors is assessed by stress testing them in conditions specified in British Standards 476 part 22:1987. These tests are made on fire door assemblies and frame which is fixed onto a wall. The test consists of a full

  • 3 hours fire rated door hardware

    A fire can be devastating to company property, but it doesn’t have to be if you take into account fire-rated wood doors. With the right products, a fire can be controlled to minimize damage and provide safety to employees and customers.

  • 90 minutes fire rated door hardware

    The fire rating classification of the wall into
    which the door is installed dictates the required
    fire rating of the door. The location of the wall in
    the building and prevailing building code establish
    the wall’s fire rating. The associated door
    ratings are shown in table 1 below.

  • Fire Rated Door Hardware Installation

    Fire doors are an important part of a building's passive fire protection system, and doors in a means of egress provide life safety by allowing people to exit quickly when necessary. So you need fire rated door hardware which can protect life safety with fire rated door.

  • What are the fire rated door hardware requirements and specifications?

    Fire doors can help compartmentalize a building, prevent the spread of smoke and flames, and protect egress routes to allow for safe escape. However, they must be properly specified, installed, and maintained to provide the necessary protection. As a professional door hardware manufacturer in China, we provide customers various quality fire rated door hardware.

  • Fire Rated Double Door Hardware

    D&D Hardware Manufacture of high quality hardware for Fire Rated Doors, Wooden Doors, Metal Doors, Escape Doors, Single Fire Rated Flush Doors, Double Doors, Security Doors, Louver Steel Doors etc.Our products which include Panic Exit Device, Lever Handles, Mortise Locks, Lock Cylinder, Door Hinges,

  • UL Fire Rated Door Hardware

    UL is an acronym for Underwriters Laboratories Inc. which is an independent product safety certification organizations. UL develops standards by which they test door hardware to verify that it meets certain safety requirements during use, or in the event of a fire or other circumstances.

  • Fire Rated Exit Door Hardware

    Fire-rated exit devices, on the other hand, are constructed of flame resistant materials. They are composed of metals and other materials which will not melt or break under extreme heat for at least 1-3 hours. All components, including screws, must be heat and flame resistant.These devices tend to

  • Fire Rated Sliding Door Hardware

    Fire rated for use on single doors the Marathon Fire Door Kit is a system developed as part of a half hour sliding fire door assembly to BS 476: Part 22: 1987, and should be installed on the non-fire risk side of an aperture. The assembly must be fitted with a solid core FD30, or FD60, timber based

  • What are the Requirements for Fire Door Hinges?

    Fire doors are a very important safety feature of any building. Fire door require the use of high-quality fire protection hinge. So what are the requirements for high-quality fire-proof Hinges? 1.Heat ResistanceFire doors are generally heavy enough to provide the proper fire protection, and to ensur

  • How to Designed Fire Door Hardware to Save Lives?

    How to Choose Fire Hardware for Fire Rated Metal Door?

  • Why need to do the fire rated door building inspection?

    The building inspection services help identify critical fire, life safety and security building improvements needed to achieve code compliance with the ultimate goal of achieving fire, life safety and security of the building. During everyday use, a fire door seems just like any other door. But when

  • Basic Fire Door Requirement-Check list

    Fire door can meet the requirements of fire stability, integrity and heat insulation in a certain period of time.Fire Doors serve four main purposes:1. To serve as a regular door at all times; 2. To provide ready egress during a fire; 3. To keep fire from spreading throughout the building;4. To prot

  • When do you need a fire rated door?

    Fire rated doors serve a purpose. They are manufactured in a way that is to help reduce the spread of fire and smoke. Fire rated doors allow occupants time to safely exit the structure during a fire or to allow for an area of refuge within the building that protects them until fire service can arrive. These doors are also part of the building's design and serve to protect fire service personnel during fire suppression. When the door is not properly latched in its frame it loses its effectiveness. When they are not properly maintained they are of no value during a fire making the design and purpose of the door obsolete.

  • What kind of door hardware is suitable for fire rated doors?

    Fire rated doors meet the requirements of fire resistance stability, integrity and insulation for a certain period of time. With more and more modern high-rise buildings, fire doors that can greatly protect the lives of people play a vital role. .Fire doors have three main functions:1. When the fire

  • What are requirements for a fire rated door hardware?

    Fire rated doors can meet fire resistance stability, integrity and insulation for a certain period of time. It is a fireproof partition with certain fire resistance, such as in fire compartments, evacuation stairwells, and vertical shafts.

    In addition to the function of ordinary doors, fire doors have the function of preventing the spread of fire and the spread of smoke, which can prevent the spread of fire for a certain period of time and ensure the evacuation of personnel.

  • What are the requirements for the hinge of fire door?

    Fire doors are doors that meet the requirements for fire resistance stability, integrity and insulation for a certain period of time. The use of matching door hardware can maximize the effectiveness of the fire door. So we need door hardware that also has a fireproof effect. In order to play the rol

  • International Standards of Fire Rated Door

    Fire rated door refers to the door that can meet the requirements of fire stability, integrity and thermal insulation in a certain period of time, together with the frame. Fire door is one of the measures for building fire prevention separation. They are usually used on fire walls, stairwell entranc

  • The Structure Classification of Steel Door

    There are four structures classification of steel door in the article. We can learn about the form welding, paper card honeycomb, stiffened door and solid core.

  • The Types of Steel Door

    When you buy Door Hardware, you should know your door. Here is different types of steel door.

  • The Components of Steel Door

    The passage mainly tells you the components of steel door from four aspects. There are infill, door leaf, door frame and finish. Hoping you can get knowledge about steel door in here.

  • How To Choose The Right Metal Door Hardware Solution-D&D Hardware

    How do you choose Metal door hardware? Many people are confused with the choice of metal door ironmongery. Metal door hardware includes Door Hinges,Lever Handles, Mortise Locks, Pull plates,Door Closers,Panic Exit Devices, Flush Bolts, Door Stoppers, Sealing Strips and so on. The ironmongery for met

  • Don't let inferior quality hardware hurt your door!

    Interior doors is anywhere in our daily life, they are used as building materials frequently, so the door hardware must strictly pass quality test. Consumers should pay more attention to the concept of green environmental protection, because there are many people choose and buy the aluminum alloy in

  • How to choose suitable door handles?

    hoose door handles according to local conditions

  • Architecture Hardware for Metal Door

    Metal doors, most commonly used in buildings, have changed from being used outdoors to being used indoors (instead of wooden doors).

    Hardware is the most important determinant of Metal Door Quality.

    Let's introduce the hardware commonly used for Metal Doors.

  • Hardware Selection for Hollow Metal Doors

    The hardware used not only determines how well a door functions, but is also an important factor in the working life of the opening. Among the many benefits of custom hollow metal is the virtually unlimited choice of hardware that can be used. The architect is free to select those items which will p

  • Recommended Hardware Locations for Hollow Metal Doors

    These standards are recommended by the Hollow Metal Manufacturers Association as representing the long accepted usual preferences of both architects and users under normal conditions of use. Under some circumstances these standard locations are inadvisable for certain items based on accessibility co

  • What are Metal Door Hardwares?

    Why Metal Doors need Special Hardware Matching?


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: +86-750- 3856396

 : sales@dndhardware.com 

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