Factory Price Hidden Door Hinges Heavy Duty 3D Adjustable Invisible Concealed Door Hinges Stainless Steel

• Customization: Available
• After-sales Service: Yes
• Warranty: 3 Year
• Model NO.: QN-S320
• Type: 180°Hinge
• Finish: Powder Coating
• Material: Stainless Steel
• Color: Silver,Black as Customer Request
• Delivery Time: 5-7 Days
• Application: Suitable for Any Window and Door
• MOQ: 100
• Transport Package: Carton
• Specification: stainless steel
• Trademark: QINIU/ODM
• Origin: China(Mainland)
• Production Capacity: 5000
• Package Size: 11.00cm * 12.00cm * 10.00cm
• Package Gross Weight: 0.600kg

Product Description

high-performance hydraulic excavator 

Hinges are fundamental mechanical bearings that connect two solid objects, allowing them to rotate relative to each other, typically along a single fixed axis. Their primary function is to enable controlled rotation and swinging motion for doors, lids, panels, and other components.

Specification

Applications

Doors and Windows:

Building Doors/Windows: Mounted on door/window frames and the door/window itself, hinges are essential for opening, closing, and securing entry points in homes, offices, and buildings (butt hinges, continuous/piano hinges, concealed hinges).
Cabinet Doors: Enable doors on kitchen cabinets, wardrobes, and storage units to swing open for access (concealed hinges, cup hinges, overlay hinges, inset hinges).
Vehicle Doors: Allow car, truck, and aircraft doors to open and close.

Furniture:

Folding Tables/Chairs: Enable legs or tabletops to fold for storage (drop leaf table hinges, rule joint hinges).
Folding Partitions/Room Dividers: Connect panels to allow folding and unfolding.

Desk Organizers: Used on flip-up document holders, pencil trays, etc.
Gates and Fencing:

Gates: Heavy-duty hinges (strap hinges, tee hinges) support the weight and swinging motion of garden gates, property gates, and industrial gates.

Key Configurations

In essence, hinges are ubiquitous wherever controlled rotational movement is needed between two parts. They provide support, enable access, facilitate folding/storage, and are critical components in construction, furniture, vehicles, appliances, and countless other objects in daily life and industry.

Invisible hinges

Zinc alloy hinges

Gear hinges

Technical Specifications

(Custom configurations available upon request.)

Model	3D 40	3D 60	3D 80
Door	Wooden Door,steel door,profile door,folding door	Wooden Door,steel door,profile door,folding door	Wooden Door,steel door,profile door,folding door
Load capacity	40kg	60kg	80kg
Standard	DinEN1935:2016	DinEN1935:2016	DinEN1935:2016
Length	183.5mm	183.5mm	183.5mm
Min.Door thickness:	More than 38mm	More than 38mm	More than 38mm
Opening angle	Up to 180 degree	Up to 180 degree	Up to 180 degree
Continuously adjustableIn 3-dimensions	Side:  ±2mm Height :  ±3 mm Depth : ± 3 mm	Side:  ±2mm Height :  ±3 mm Depth : ± 3 mm	Side:  ±2mm Height :  ±3 mm Depth : ± 3 mm
Handed	No handed design	No handed design	No handed design
Material	ZINC ALLOY+SUS 304	ZINC ALLOY+SUS 304	ZINC ALLOY+SUS 304
Finish	SS,PS,AB,PVD	SS,PS,AB,PVD	SS,PS,AB,PVD
Quantity for single door	2pcs	2pcs	2pcs
Remark	The 3rd hinge willincrease 20%loadingPlease refer the instruction	The 3rd hinge willincrease 20%loadingPlease refer the instruction	The 3rd hinge willincrease 20%loadingPlease refer the instruction

Drawings & Dimensions

Detailed CAD drawings and dimensional diagrams are available for download here or upon inquiry. Our engineering team can provide tailored designs to meet specific project requirements.

After Sales Service

Standard Warranty: 12 months or 10,000 times (whichever comes first).
Extended Warranty: Optional coverage up to 36 months.
Global Support: 24/7 technical assistance and spare parts supply.
Training: On-site or remote operation/maintenance training.

Company Profile

HEBEI QINIU Machinery Equipment Co., Ltd.

Since the establishment of Hebei Qiniu Machinery Equipment Co., Ltd., the company has experienced significant growth and development. We focus on expanding our expertise in various industries, specializing in hardware locks, door control systems, all types of door and window hardware products, including machinery and equipment, auto parts, electronic products, electronic placement, hardware and daily necessities. Through continuous research and development efforts, we have been able to meet the changing market needs and provide innovative solutions.

Why Choose Us?

Other Products

OEM/ODM capabilities
Competitive pricing & bulk discounts
Fast shipping & customs clearance support
Turnkey project solutions

Smart lock
Electromagnetic lock
Access control
Door closer
Hinge

FAQ

Q: What’s the lead time for orders?
A: Standard models ship in 15–30 days; customized units require 30–45 days.

Q: Do you provide after-sales service overseas?
A: Yes, we have partnered service centers in key regions.

Q: Can I request a customized bucket size?
A: Absolutely! We offer tailored attachments.

Q: What documents do you provide for export?
A: Full export package (Commercial Invoice, Packing List, Bill of Lading, COC, etc.).

Q: How do I place an order?
A: Contact us via email/phone for a quote, then confirm with a PO.