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

We have full-range stock of double-end threaded studs, specifications from M3 to M30 with length ranging from 8mm to 500mm.

Main Products: Flange Bolts, Hexagon Head Bolts, Sems Bolts, Hexagon Socket Head Cap Screws, Hexagon Socket Countersunk Head Screws and Various Non-standard Fasteners & Special-shaped Parts

Open End Blind Rivet, Peel Type Blind Rivet, Closed End Rivet, Unigrip Type Rivet, Multi-grip Type Rivet, Hem-Luk Rivet, Lock-Luk Rivet, Grooved Type Rivet

Our main products include: galvanized wire rods, hot-dip galvanized wire rods, double threaded rods, threaded rods, threaded rods, DIN976, DIN975, British, American, 8.8, 10.9, and 12.9 grades

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High-carbon steel and low-carbon steel wire rods undergo pickling surface treatment and wire drawing.