Stainless steel flange M5 anti-slip screws, hexagon with nut and washer, ship accessories

Application Scenarios (Specific Products) & Characteristics of Flange Anti-Slip Screws in Shipbuilding Industry

1. Application Scenarios in Shipbuilding Industry (Specific Products)

1.1 Hull Structure & Deck Systems

• Hull plating & bulkhead assembly: Hexagon flange bolts (DIN6921 / GB5787) for hull sections and cabin partitions. Flange distributes stress; serrations resist vibration from waves and hull motion.
• Deck equipment foundations: Windlasses, winches, bollards, lifeboat davits. Usually A4-80 stainless steel flange screws, corrosion-resistant to seawater and anti-loosening under strong vibration.
• Hatch covers & watertight doors: Flange face bolt-and-nut assemblies to ensure watertightness and structural rigidity under frequent operation and wave loads.

1.2 Power & Propulsion Systems

• Main/auxiliary engine flanges: Cylinder blocks, exhaust pipes, turbocharger flanges of marine engines. High-strength alloy steel flange screws to withstand high temperature, high-frequency vibration and explosive pressure.
• Gearbox & shafting: Flange bolts for couplings and bearing housings to maintain transmission accuracy and prevent loosening.
• Propeller shaft & stern tube: Duplex stainless steel (2205/2507) flange bolts, resistant to chloride ion corrosion and fatigue in seawater.

1.3 Piping & Valve Systems

• Seawater, fuel, steam pipelines: Flange face bolts (PN16/PN25) for valves, filters, heat exchangers, ensuring reliable sealing and anti-loosening.
• Ballast water & fire-fighting systems: Stainless steel flange screws suitable for humid, salt-spray environments.

1.4 Interior & Electrical Systems

• Sanitary units: Flange screws for marine vacuum toilets, with serrated locking to avoid leakage under vibration.
• Electrical cabinets & consoles: Hexagon socket flange screws for stable fixing of PCBs and equipment.
• Furniture & fixtures: Flange nuts (DIN6923) to prevent shifting during navigation.

2. Core Characteristics

1. Integral flange, no washers needed: Replaces flat and spring washers, simplifies installation, improves stress distribution.
2. Anti-slip serrations, excellent locking performance: Radial knurling under flange embeds into the mating surface, providing reliable anti-loosening under vibration.
3. High strength & corrosion resistance: Available in 8.8/10.9 alloy steel, A4-80, 2205/2507 stainless steel, with passivation or PTFE coating for seawater/salt-fog resistance.
4. Space-saving: Compact design ideal for confined spaces on board.
5. High sealing performance: Ensures watertight and airtight connections.

3. Advantages of Cold Heading vs. Machining

1. Mechanical properties

    

   Cold heading preserves continuous metal fiber flow and refines grains, improving tensile strength by 15–20% and fatigue life. Machining cuts off metal fibers, weakening structural strength.
    
2. Material utilization

    

   Cold heading is near-net-shape with 90–98% material yield. Machining produces heavy chips, only 40–70% utilization.
    
3. Production efficiency

    

   Cold heading supports high-speed automatic mass production. Machining is single-piece cutting with much lower efficiency.
    
4. Dimensional consistency

    

   Cold heading provides stable precision via dies. Machining has larger variation and requires extra finishing.
    
5. Surface quality

    

   Cold heading gives smooth surface, good for coating. Machining leaves tool marks and may cause stress concentration.
    
6. Overall cost

    

   Cold heading reduces total cost by 30–50% compared with machining, suitable for large-scale marine fastener supply.

    

We have introduced advanced equipment and technology from Japan and Germany (CNC 5-axis and 6-axis machines) to better serve our customers' needs.

Our maximum processing outer diameter is 60, and the minimum control tolerance is 0.001. We have Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment, and various process equipment, which can effectively provide customers with the best technical solutions.

Our company has a total of 300 employees, including 20 technicians, 10 engineers, and 15 quality control personnel. We have over 300 pieces of equipment.

Our company implements 8S management and has passed ISO9001 and TS16949 automotive certifications.

Our customers include Siemens, bo-sch, Foxconn, Panasonic Motors, Husqvarna, Shimano, NVIDIA, DJI Drones, Siegenia, and Cater-pillar.