Door hardware consists of core components that ensure door installation, opening/closing, safety, and sealing. Classified by function, it falls into four major categories: Basic Structural Accessories, Safety Lock Systems, Auxiliary Functional Accessories, and Installation & Fastening Accessories, covering the full range of needs from installation to daily use. Below is a detailed breakdown and description of core accessories:
I. Basic Structural Accessories (Core Load-Bearing & Opening/Closing Functions)
Responsible for door fixation, support, and smooth operation, serving as the "skeleton" of the door:

Hinges:Core function: Connect the door leaf to the frame, enabling rotational opening/closing;
Common types: Butt hinges (universal for wooden/steel doors), spring hinges (automatic door closing), hydraulic hinges (buffered and silent), heavy-duty hinges (load capacity ≥50kg, suitable for security doors/industrial doors);
Materials: 304 stainless steel (rust-resistant), zinc alloy (cost-effective), brass (high-end scenarios).
Sliding Rails/Guidance Rails:Core function: Adapt to sliding doors and folding doors, ensuring smooth translational movement;
Common types: Load-bearing sliding rails (industrial doors/heavy-duty sliding doors), silent sliding rails (household wooden doors), concealed sliding rails (aesthetic requirements);
Applicable scenarios: Wardrobe doors, kitchen sliding doors, industrial workshop sliding doors.
Door Stops/Floor Stops:Core function: Fix the door leaf, preventing 晃动 and wall collisions caused by wind or impact;
Types: Wall-mounted stops (installed on walls), floor-mounted stops (installed on the ground for door sides without adjacent walls).
Door Supports/Limiters:Core function: Restrict the door opening angle (usually 90°/180°), avoiding hinge or wall damage from over-opening;
Applicable scenarios: Security doors, balcony doors, glass doors.
II. Safety Lock Systems (Anti-Theft & Convenient Operation)
The safety core of the door, balancing anti-theft performance and user-friendliness:

Lock Bodies:Core function: The executive component of the lock, controlling bolt extension/retraction;
Common types: Mechanical lock bodies (traditional doors), smart lock bodies (compatible with fingerprint/password locks), anti-theft lock bodies (multi-bolt design, pry-resistant).
Lock Cylinders:Core function: Control lock activation, a key anti-theft component;
Security grades: Grade C (industry highest standard, resistant to technical picking for ≥270 minutes), Grade B (≥5 minutes), Grade A (obsolete, ≤1 minute);
Material: Copper core (corrosion-resistant and wear-resistant).
Door Handles/Knobs:Core function: Operate lock opening/closing, balancing feel and aesthetics;
Types: Mechanical handles (paired with traditional locks), smart handles (integrated with fingerprint/password), hidden handles (specialized for security doors, pry-resistant);
Materials: Stainless steel, aluminum alloy, zinc alloy (electrophoresis/spray coating for rust resistance).
Top & Bottom Bolts:Core function: Enhance door sealing and anti-theft performance, with bidirectional locking (bolts extending from top and bottom of the door);
Applicable scenarios: Security doors, fire doors, industrial doors.
Anti-Theft Latches/Safety Chains:Core function: Auxiliary anti-theft, limiting door opening width (e.g., 10cm) when open to prevent forced entry;
Applicable scenarios: Entry doors, hotel doors.
III. Auxiliary Functional Accessories (Sealing, Silence & Convenience)
Improve user experience by addressing sealing, noise reduction, and automatic closing needs:

Door Closers:Core function: Control automatic door closing, adjust closing speed, and prevent door collisions;
Types: Hydraulic door closers (silent and buffered), spring door closers (simple scenarios);
Applicable scenarios: Office doors, fire doors, public area doors.
Door Sequencers:Core function: Adapt to double doors, ensuring they close in a fixed order (secondary door first, main door second) to avoid collisions or sealing failure;
Applicable scenarios: Fire doors, security doors, large double doors.
Sealing Strips:Core function: Fill gaps between the door and frame/floor, achieving sealing (sound insulation, heat insulation, dustproofing, waterproofing);
Types: Rubber sealing strips (universal), silicone sealing strips (high/low temperature resistant), wool felt strips (for door gaps).
Door Viewers (Peepholes):Core function: Allow indoor viewing of outdoor conditions, preventing peeping and theft;
Types: Ordinary optical viewers, electronic viewers (with display/night vision).
Dust Strips/Anti-Collision Strips:Core function: Reduce friction noise during door operation and protect door edges from wear;
Applicable scenarios: Wooden doors, aluminum alloy doors.
IV. Installation & Fastening Accessories (Fixation & Assembly)
Basic accessories for door installation, ensuring structural stability:

Expansion Bolts/Screws:Core function: Fix frames, hinges, lock bodies, and other components to walls or door panels;
Materials: Stainless steel (rust-resistant), carbon steel (galvanized for corrosion protection);
Types: Expansion bolts (fix frames to walls), self-tapping screws (fix hinges/handles to door panels).
Angle Brackets/Connectors:Core function: Enhance the strength of frame and door leaf joints, preventing deformation;
Applicable scenarios: Frame assembly for aluminum alloy doors and PVC doors.
Mounting Plates/Reinforcement Plates:Core function: Add reinforcement to thin or soft door panel areas (e.g., hinge/lock installation points) to improve load-bearing capacity and stability;
Applicable scenarios: Wooden doors, light steel doors.
Supplementary Notes (Purchasing/Selection Reference)
Door Type Adaptation:Wooden doors: Prioritize silence (hydraulic hinges, silent sliding rails) and aesthetics (brass/aluminum alloy handles);
Security doors: Prioritize anti-theft performance (Grade C lock cylinders, top & bottom bolts, heavy-duty hinges);
Industrial doors: Emphasize load-bearing capacity (heavy-duty sliding rails, thickened hinges) and durability (304 stainless steel);
Smart doors: Match with smart lock bodies, electronic handles, and linked door closers.
Quality Selection Key Points:Prefer materials like 304 stainless steel (humid environments) and zinc alloy (cost-effectiveness);
Locks must comply with national standards (GB/T 32248-2015 "Door Hinges", GA/T 73-2015 "Mechanical Anti-Theft Locks");
Core accessories (hinges, lock cylinders, sliding rails) are recommended to be sourced from origin factories with quality guarantees (e.g., 3-5 year warranty).