Products Category


 : +86-750-3652251 / 3856396

: +86-750-3856395 / 3856397




  • What is Surface Vertical Rod Exit Devices and what applications can it be used?

    The surface vertical rod exit device mounts to the surface of the door. A top and a bottom rod extend the full height of the door and are attached to latch-bolt assemblies. The top latch-bolt assembly engages a strike that can be either surface-applied or mortised into the soffit of the frame. The bottom latch-bolt assembly can latch into a surface-applied or mortise strike in the floor. A latch-track threshold can also serve as a strike to secure the bottom latch-bolt assembly. Similar to rim exit devices, the operating trim extends through the door thickness and engages the lock case of the exit device.
    The clearance between the door bottom and the finished floor is an important dimension that needs to be addressed. Depending on the design of the latch-bolt assembly and the strike, the doors may have to be ordered with a non-standard undercut to ensure the latch-bolt can properly engage the strike.

  • How to choose a Door hinge?

    The product we are presenting today is the door hinge, an important component for safety and security, which is used to connect various doors. In this article, we will describe the functions and types of door hinges, as well as some advice on how to choose them.

  • The common types of Door hardware.

    With the development of metalworking technology, the use of door hardware is becoming more and more widespread. door hardware is an extremely important type of everyday metalwork in people's daily lives, and it is used in wooden doors, glass doors, sectional doors and other metal devices made by man

  • Where are Door Closers required?

    A ​door closer is an adjustable and spring-loaded mechanical arm that closes a door automatically after it has been opened. Door closers are usually filled with hydraulic fluid, which dampens the door swing and controls its operation. Installing a door closer adds a level of control to your door's safety and security.

  • What is the different between Panic Hardware & Fire Exit Hardware?

    An exit device is a piece of hardware mounted on the push side of a door. It is designed to release a latching mechanism in the event of panic. Exit devices are intended to operate without prior knowledge or training when pressure is applied to horizontal bar or push pad mounted to the door.
    Because of their direct effect upon life safety, exit devices are one of the most important hardware items in a building.
    Panic Hardware and Fire Exit Hardware are two different types of exit devices, and the proper selection is determined by code requirements.

  • How to choose the appropriate door hinge?

    Door 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 lowest frictional resistance.
    The hinges come in a variety of materials, including zinc alloy, steel, plastic, and stainless steel. Different materials determine the scope of use of the hinge. The choice of hinges has a very large impact on the use of the door. If an improper hinge is installed on the door, it is not only difficult to play the role of the door, but serious circumstances may endanger life safety. In order for the door to maximize door hanging and gating, it is important to choose the appropriate hinge.

  • Why your products could face shipping delays in China?

    These days , Chinese Factories are experiencing unexpected delays in productions and even closing theirs door for a couple of weeks. The reason is because Beijing is sending inspectors to make sure factories are complying with state environment rules in fighting the country’s war on pollution.
    The central government of China has sent an army of inspection teams into the financial hub of Shanghai and Guangdong to monitor and inspect air pollution in the regions, to make sure the environment stays clean and it’s safe for the people in the region. Most of the factories, especially in Jiangmen and Zhongshan areas, have temporary closed for 7-20 days, causing delays in finishing orders in this already super rushed and busy season.

  • How to identify Factory or Trading Company?

    In today's international business, more and more customers prefer to do business directly with factories, because factories always give better price and professionalism,So more and more trading companies pretend to be a factory.

  • How to choose Door Scheduling (1) ?

    The door scheduling is suitable to the design which is belong to designer. The designers must have concept of design, and then find the door hardwares which meet the design's requirement of designers.

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

    Fire rated 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 role of normal opening and closing of the fire door in the event of fire, the fire door hinge must be certified to install the fire door. Some people may question "Why must we have a fireproof hinge to be installed on fire door? Why can't a general stainless steel hinge was installed on fire door?"

  • 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 codes. For example, a lower position for the deadlock is possible, when intended usage by small children or handicapped persons necessitates require positioning the user handled items in other than these recommended standard locations.

  • Hardware Selection for Hollow Metal Doors

    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 provide the operational features, aesthetics, and quality desired, such as the use of electrical hardware, pivots or anchor hinges, concealed closers, concealed vertical rod devices, separate deadlocks, preassembled locks, and other architectural hardware.

  • How to choose hinges for different functions?

    The stainless steel hinge is a metal connector that is seen on the door every day so that the door can be mounted on the door frame and can be freely rotated. The hinges can be seen in any place with a door, but it is often overlooked and used without a professional choice.

  • How to Choose the Right European Mortise Lock?

    The mortise lock is generally used on the security door, suitable for general commercial and heavy industrial use. The D&D range of architectural locks is manufactured to the highest engineering standards and designed to offer a high price/performance ratio. They have been successfully type tested to all the requirements of BS EN12209. The following describes the various types of European mortise locks and the safety features that should be considered.

  • 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.

  • 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.

  • 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 entrances or pipe wells, requiring smoke and fire isolation.
    Fire doors not only have the function of ordinary doors, but also have the function of preventing the spread of fire and smoke. They can prevent the spread of fire in a certain time and ensure the evacuation of people.

  • How to Select Stainless Steel?

    Stainless steel is short for stainless acid-resistant steel. Weak corrosive media such as air, steam, water or the steel with rust resistance is called stainless steel.
    Each stainless steel has good properties in its specific application fields. The key to success is first to clarify the usage, and then to determine the correct steel grade.

  • 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.

  • How To Select And Install the Door Hinge Properly?

    Door hinges, one of the hardware accessories, are used to connect or rotate the device so that the door can be freely opened and closed by hinges. There are many types of door hinges, such as fire rated door hinges, metal door hinges, European door hinges, etc. In general, the hinge is composed of a pair of metal leaves, the distance between hinge and door can be adjusted when installing .One of the characteristics of door hinge is that it can be used according to the space and the opening angle of the door, so that various doors have corresponding extension. Different doors need to pay attention to their size when using hinges.

  • 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.

  • 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.

  • Is there a difference between interior and exterior door hinges?

    A door, a building entrance or exit, or a device that can be opened and closed at the entrance and exit, is an entity that divides a limited space and can connect and block the entrance and exit of two or more spaces. Doors can be classified into interior doors and exterior doors. Functionally speaking, interior doors generally refer to bedroom doors and office doors, and exterior doors generally refer to security doors and fire doors.

  • What are Metal Door Hardwares?

    Metal doors, most commonly used in Education, Healthcare, Hotel, Government and Commercial buildings. The greatest feature of metal doors is durability, because they are made of stainless steel or steel. It has strong anti-theft and anti-wear properties.

  • Why Chinese New Year Affect your Business?

    Chinese New Year”, Also called the “Spring Festival”, is the most important festival in Mainland China , Hong Kong , Macao , Taiwan and Singapore . It’s the Christmas or Ramadan or Diwali of China only on a bigger bigger scale. The date is decided based on the lunar calendar , So the exact date varies each year but usually falls between mid-Jan to end of Feb.

  • How to choose Door Scheduling (2) ?

    we learn about the factors, steps and Successive sequence of door scheduling. Now we continue to learn to choose Door Scheduling.

  • How does a mortise lock work?

    The mortise lock is a very popular and ancient design that has stood the test of time. They are sturdy and reliable. Their structures are also relatively diverse. Modern mortise locks are a popular lock often used in the security industry of commercial locksmiths. Its rugged design has stood the test of time. Mortise locks can be used for decades. In fact, these mortises exist in old houses and buildings and are resistant to bad weather and time.
    The mortise lock has a long life, so understanding the structure and principle of the mortise lock can provide great help for installation and maintenance.

  • How to fix blocked door locks?

    In general, as long as there are doors, locks are needed, and locks are an integral part of any place. A door lock can protect the personal belongings are not violated, so to ensure the integrity of the lock is important. However, as the years accumulate, dust accumulation, wear or rust will occur on the locks, so do you know how to fix the locked door lock?

  • Mortise Lock Components

    D&D Hardware Mortise Locks are meet EN12209,according to DIN 18250, 18251, suitable for commercial, industrial and prestigious residential projects and provide different functions to meet various applications.

  • Door Locks Standard

    American National Standard Institute(ANSI).European(EN).Australian Standard(AS).CNACL China Local Fire Test Beauer Certificate CANCL to be satisfied

  • Introduction Grade 3 Lever Handle

    D&D grade 3 level handle are suitable for high frequency of use by public or others with little incentive to exercise care and with a high chance of misuse , e.g.public office doors ,common area doors etc.

  • Different Product Rang of the Pinning Center

    The D&D pinning Center is staffed by factory trained technicians and is equipped with the latest computerized software and key cutting machinery.

  • 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 material. The hinge consists of two parts: a male end with a plate and a pin, and a female end with a plate and a receiving slot. The two parts are joined together once each plate is secured to a different piece of material.


    Are classified under the same classifications as the door hardware in/on which they are integrated. This means that the access control systems supplied by GBM Solutions is classified according to EN1303 – cylinder for locks, DIN EN 18252 – locking cylinder for door locks, DIN EN 1906-door handles and door konbs and DIN EN 179 apply for the equipment that we supply .

  • Acceptable Quality Limit(AQL) Standard

    D&D Inspectors exclusively use ISO 2859 tables to measure AQL. These tables are a United States standard with equivalents in all national and international standardization organizations (ANSI/ASQC Z1.4, NF06-022, BS 6001, DIN 40080).



  • Composition Effects on The Magnetic Permeability of Austenitic Stainless Steels

    Austenitic 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 and heat treatment conditions

  • 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.

  • 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.

  • Stainless Steel Materials

    Stainless steel's are divided into grades (and sub grades) which are determined by their specific constituent elements e.g Chromium and Nickel; these grades help identify whether that steel is more or less suitable for any given application and ,for example in guidance on the materials corrosion resistance, mechanical or thermal performance or machinability.

  • Frequency of Door Usage and Standard for Lock

    Guidelines for frequency of door usage and standard for lock

  • 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.

  • 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 permeability of 1. Austenitic structures are totally non-magnetic and so a 100% austenitic stainless steel would have a permeability of 1. In practice this is not achieved.

  • 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.

  • Global Door Hinge Market Report 2017

    Door Hinge Market is segmented based on type, application, and region. The Door Hinge Market report provides an in-depth overview of Product Specification, product type and production analysis considering major factors such as Revenue, Cost, Gross and Gross Margin.

  • 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 developing economies. Also, the major reason that drives the market is the increasing security concerns across regions, which is mandating the need for the installation of such high-security door closer systems at residential and commercial spaces.

  • 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)?
    3. What is the door's construction and are there any unusal features that could affect the hinges?
    4. Where is the door situated e.g internal or external; is it near the coast or in a swiming pool?
    5. What level of use/abuse will the door be subject to e.g office, hospital or school corridor?
    6. What other items of hardware are to be fitted, that may be affect the hinge performance, typically door closer or door stops?
    7. Any other unusal features involved e.g. door has radius top or the door is a bifold.

  • 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 of fire door hardware.

  • 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 rating of the wall and use of the door.


Contact Info

:+86-139 2903 7292   David Jian

: +86-750- 3856396


:  No.4 Bldg, Street 33, West Gaoxin Rd, High-tech Zone, Jianghai Dist. Jiangmen City, Guangdong, China 

©Copyright D&D HARDWARE INDUSTRIAL Co., Ltd. All Rights Reserved.