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  • Hinge for fire and escape doors

    When use in a fire-resisting door assembly, the door leaf should be hung on single-axis hinges in accordance with local and national regulations. Hinges fitted to fire-resisting doors should be able to achieve the intended fire rating, also the hinge should be able to allow the door closing device, when fitted to a fire-resisting door assembly, to close the door leaf reliably from any angle to which it has been opened, overcoming the resistance of a latch or any seals when fitted.

  • How to choose the Exit Device to provide Safety and Security

    Public buildings like most industrial and commercial premises are required to meet the conflicting need for both safety and security. Regulations relating to escape from buildings and general safety have made it desirable that doors at exits in public buildings, places of public entertainment, shops, etc, be fitted with ​panic exit devices. The main purpose of a panic exit device is to give safe and effective escape through a doorway with minimum effort and without prior knowledge of the device.

  • What are the functions of the American standard Mortise Lock?

    American mortise locks are the best choice for commercial building doors. The strength of the doors and the locks used will have a major impact on the safety of the building. In order to choose the American mortise lock with suitable requirements, we need to understand the following question: how to

  • Which are the most frequently used function of Exit device

    There are many operating functions available. The most frequently used are: Function Description number

  • How to Select Panic Exit Device for doors?

    Exit devices are available in two design styles

  • What is Silencer and where do we use it?

    Sometimes referred to as mutes, silencers are used to cushion the closing of a door in a wood or metal frame, thus quieting the closing of the door. Door silencers are small rubber buttons, approximately 1/8” thick, with a projecting portion for insertion into holes prepared in the stop of frame.

  • What are Protective Plates?

    Protective plates are used on doors in all types of buildings. They are designed to protect doors from scratches, dents and other damage caused by moving equipment through openings.

  • BS EN 1935 CE Single Axis Door Hinges

    BS EN 1935 classifies door furniture door furniture by using an 8 digit coding system. A similar classification applies to all building hardware product standards so that complementry items of hardware can be specified to, for instance, a common level of corrosion resistace, category, category of use, etc. each digit refers to a particular feature of the product measured against the standard's performance requirements.

  • How to choose Hinge for Door?

    The door hinge is an important part of door, it can make open and close the door easily, can also make the door installation and removal easy. We have plated the surface of exterior and interior door hinges, it looks smooth and deepens the beauty of commercial building. Compared with single hinge, the door hinges hardware offers additional savings.

  • ANSI and EN Hinge Comparison

    American National Standard Institute (ANSI) ANSI 156.1 This Standard establishes requirements for butts and hinges. Cycle tests, lateral and vertical wear tests, friction tests, strength tests, finish tests, and material and dimensional requirements are included.

  • What is surface mounted door closer and how to mount it?

    Surface mounted door closers are the most efficient and economical means of controlling doors and are thus, the most commonly used type of closers. But, because they are exposed to view, there are some installations where a concealed door closer better suits the needs of the owners and users. On exterior openings, surface door closers should always be installed on the interior side of the openings to protect the closers from fluctuations in temperature. On interior openings, good practice dictates that surface door closers be installed on the room side of the openings, out of the corridor.

  • What is a door coordinator and what does it do?

    Door coordinators are used to control the closing sequence of a pair of doors when both leaves are furnished with latching hardware and one leaf latches into the other of has an overlapping astragal. Typically, these openings will have a vertical rod exit device or automatic flush bolts installed on

  • What's the Door Lock?

    Locks are one of the world's oldest inventions, with a wide variety and thousands of years of development. The door lock is one of the locks that are indispensable for any occasion in our lives. The importance of door locks is particularly evident. Today we will combine the definition and characteristics of door locks with a brief summary and analysis of door locks.

  • 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


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