Line Blind  Manufacturers, Traders, Suppliers

Qingdao Singho Industrial Co.,Ltd. (Est.in 1999) is a leading company in OEM/ODM services for US and European customers. With in-house casting foundry, CNC machining workshop, assembly line and quality testing lab, we have built long-term partnerships with 200+ customers in 20+ countries.
Material covered
• Carbon steel (e.g. AISI 1015/1045/1080) [0.1-80kg]
• Alloy steel (e.g. AISI 4140/4340/8620) [0.1-80kg]
• Stainless steel (e.g. 300 series, 400 series, 17-4PH, 15-5PH) [0.1-80kg]
• Complex alloy (e.g. G22NiMoCr5-6) [0.1-80kg]
• Gray Iron [0.1-1000kg]
• Ductile Iron (Spheroidal Graphite Iron) [0.1-1000kg]
• Aluminum Bronze [0.1-80kg]
Production Process
• Reverse engineering
• Quick prototyping (with 3D printing and casting simulation)
• Casting (investment casting, shell casting, resin sand casting, green sand casting)
• Machining
• Surface treatment (polishing, anodizing, priming, painting, rubber coating)
• Assembly
QC Test (to be performed as requested with official reports)
• Dimensional checks
• Mechanical property
• Chemical composition
• NDE tests (VT, PT, MT, UT, RT)
• Hydraulic pressure tests (for pressurized parts)
• Pump performance curve tests

NINGBO HENTO METAL PRODUCTS CO.,LTD. is a a leading manufacturer specializing in precision metal parts production ,Located in Ningbo, Zhejiang Province,China. With 15 years development ,HENTO METAL have grown up a comprehensive international manufacturer and trade platform integrate,production, product development and international trade.
Why choose HENTO METAL :
Expertise in Industrial Metal Components: 15+ years of experience producing CNC-machined parts, stampings, castings, and custom assemblies for global clients in automotive, machinery, and engineering sectors.
✅ ISO 9001-Certified Quality: Rigorous quality control from raw material selection to final inspection, ensuring compliance with DIN/EN/ISO standards.
✅ Cost-Effective Solutions: Competitive pricing with streamlined production in Ningbo, China, coupled with flexible MOQs for prototype or bulk orders.
✅ Agile Lead Times: 30% faster turnaround than industry averages, supported by in-house tooling and vertical integration
Our main products include :
stainless steel precision parts （froging/cnc/precision casting)）
Aluminum alloy precision parts (die casting /cnc/forging /gravity casting/high presure casting）
Zinc alloy precision parts（die casting/cnc machining/cnc turning）
Copper parts : brass, lead-free copper (casting/cnc machining/forging parts )
Alloy steel precision parts
Iron precision parts(casting/cnc )
Sheet metal stamping,welding and drawing precision parts
The products are widely applied in mechanical industries such as healthcare,petroleum, electricity, automobiles, food, chemicals, railways, mines, steel, shipbuilding, etc;
Quality Control
Scientific and Efficient Quality Control Methods in Metal Processing
Modern metal processing employs advanced quality control systems integrating cutting-edge technologies and data-driven methodologies:
1.Automated Dimensional Inspection
Laser scanners/CMMs (Coordinate Measuring Machines) for micron-level precision
In-process gauging with CNC machine feedback loops

AECA is a privately owned, focusing on the processing and production of precision parts. We are ISO9001:2015 Quality Management System.
IATF16949:2016 Automotive Quality Management Systems certified and are certifying ISO13485:2016 Quality Management System for Medical Device Manufacturing. State of the art precision machining facility is continually evolving as we strive to stay at the forefront of machining and manufacturing.