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Testing Center
Testing Center

Quality assurance is based on the perfect quality management system.
Zhanmei has gathered a number of professional elites who are engaged in product quality inspection and research and development. Our commitment is based on the product quality, with the business philosophy of "excellence and superior quality", to continuously improve the product quality and service, and lead Zhanmei to continuously grow and develop.
Zhanmei has the physical and chemical testing equipment valued more than 2 million Yuan, three Germany-imported spectral analyzers, sclerometer, tensile tester and chemical laboratories, as well as professional and experienced quality engineering and technical personnel, and rigorous work and professionalism, which provide the reliable quality assurance for the products of Zhanmei.

Shape Basic size Diameter tolerance Tolerance of roundness (not greater than) Bending degree (no greater than) (mm) Length deviation(mm)
polishing Drawing Extrusion polishing Drawing Extrusion
Round bar ≥2-8 0-0.018 0-0.035 0.0025 0.005 1 ±10
>8-15 0-0.025 0-0.04 0-0.15 0.003 0.007 1 ±10
>15-25 0-0.07 0-0.18 0.010 1.5 ±10
>25-36 0-0.12 0-0.21 0.015 1.5 ±10
hexagonal and special-shaped bars ≥4-8 0-0.03 0-0.15 0.005 1.5 ±10
>8-13 0-0.04 0-0.18 0.007 1.5 ±10
>13-21 0-0.07 0-0.18 0.010 3 ±10
>21-26 0-0.12 0-0.21 0.015



Note: The enterprise standard of Zhanmei is in line with GB4425-84 standard, and its polishing and drawing accuracy can fully meet the processing needs of high-end imported CNC machines and automatic lathes, to develop the delivery tolerances and grade accuracy according to the actual needs of customers.

variety Specifications Japan Main characteristics and Applications
name grade state grade Code
free cutting lead brass Hpb59-2 drawing
C3604 C3604BDS The superior cutting performance is available for bolts, nuts, small screws, shafts, gears, valves and components for watches, carburetors, IT industry and precision instruments. The GD high-precision hexagonal brass rod can be used for the imported high-precision CNC machine tools to process and produce the high-precision components.
cold riveting lead brass Hpb63-3 drawing
C3560 C3560BDS The superior cutting performance with excellent extension is available for the components that are subject to both cutting processing and cold riveting processing, and is mainly used for electrical switching components and enrichment valve piston of carburetor.
forged lead brass Hpb59-1 drawing
3771 C3771BD
The excellent hot forging performance and processing performance are available for air-conditioning valve, valve core, automotive valve and other complex high-precision parts, as well as high-grade plumbing equipment, case, strap, luxury hardware jewelry, locks, handles and so on.