Blackening Treatment for Stainless Steel and Copper Materials (Fasteners, Rigging, Castings, Precision Machined Parts): High surface hardness: 6H grade. Strong adhesion: 5A grade. Clean, oil-free, and environmentally friendly, compliant with EU RoHS (SGS report available upon request). Thin coating (3-8 μm), minimally impacting thread acceptance with go/no-go gauges. Resistant to acids, alkalis, and seawater corrosion, verified by corrosion tests. Heat-resistant up to 400°C without peeling. Effectively prevents thread locking and provides lubrication, with a friction coefficient between 0.19 and 0.25. Excellent salt spray resistance: starting from 120 hours, up to 300 hours, and can achieve 1000 hours. UV-resistant, colorfast, and aging-resistant. Consistent color across multiple production batches. Contact: 18661897293 / 18653205193

The company adheres to the quality policy of 'striving for perfection and keeping pace with the times,' and is equipped with more than 250 precision spring manufacturing machines, including high-precision spring machines imported from Japan and MEC fully computerized intelligent control equipment, capable of precision processing in the wire diameter range of 0.008-10mm, with a minimum processed outer diameter of 0.08mm. Through the innovative K3 MES production management system and the independently developed 'Product Life Database,' each product has a fully traceable digital record. The complete supporting processing system, covering heat treatment, ultrasonic cleaning, precision processing, and more than 60 specialized processing machines, provides comprehensive assurance for product quality.

National standard expansion bolts, colored tape hole expansion bolts, chemical anchor bolts, mechanical anchor bolts, car repair gecko clips, internal gecko clips, three-piece gecko clips, four-piece gecko clips, sleeve gecko clips, hollow gecko clips, toothed strips, nuts, bolts, and other types of fastening components.

Liheng Company, founded in 2015, specializes in producing screws, including various non-standard parts, assemblies, oil plugs, flanges, and automotive fasteners. Its materials include iron 8.8+10.9+12.9+stainless steel 201+stainless steel 304

stainless steel washer, stamping parts, change ring, hardware, mechanical accessories,

Carbon Steel Wire、Alloy Steel Wire

Lock washer, clip, ring