I. Product Function
1. Detachable sealing and locking fasteners for various flanges, composite pipe fittings, and stainless steel pipelines, enabling pipeline disassembly, assembly, and maintenance;
2. Supporting connectors for municipal water supply, sewage treatment, chemical desulfurization, seawater desalination, and marine corrosion-resistant pipeline flange systems;
3. Special fastening accessories for complete anti-corrosion pipeline systems, including overlay-welded composite steel pipes, lined composite pipe fittings, and marine single-sided and double-sided panels;
4. Salt-spray-resistant and acid-alkali-resistant locking components for offshore platforms, storage tanks, pressure vessels, and inlet and outlet equipment.
II. Specification, Standard and Material Parameter Table
Parameter Category | Detailed Parameters |
Bolt Category | Hex socket cylindrical head / flat head / button head bolts, external hex bolts, hex flange bolts, double-end stud bolts, carriage bolts, wood screws, and construction bolts |
General Applicable Standards | GB/T Chinese standards, DIN German standards, ISO international standards, ASME American standards, JIS Japanese standards, EN European standards, IFI, and AS Australian standards |
Metric Cold-Forged Size Range | M3–M36 |
Metric Hot-Forged Size Range | M39–M64 |
Imperial Cold-Forged Size Range | 5#–1-3/8" |
Imperial Hot-Forged Size Range | 1-1/4"–2-1/4" |
Standard Lengths of Cold-Forged External Hex Bolts | M3–M4: 5–65mm; M5: 6–130mm; M6: 8–300mm; M8: 10–300mm; M10: 14–280mm; M12: 16–300mm; M14: 20–280mm; M16: 20–300mm; M18–M20: 30–300mm; M24: 35–280mm; M27: 50–300mm; M30–M36: 60–280mm |
Unified Hot-Forged Length Range | From M16, 60–500mm |
Available Matching Materials | 304, 316L, and 2205 duplex stainless steel |
III. Material Application Scenarios
1. 304 stainless steel: a general economical option, suitable for indoor water supply and drainage, ventilation systems, and standard flange fastening under non-corrosive conditions;
2. 316L stainless steel: resistant to chloride ions, seawater, and salt spray corrosion, suitable for marine pipelines, coastal sewage systems, and desulfurization pipelines;
3. 2205 duplex stainless steel: high strength and strong resistance to acids and alkalis, suitable for offshore drilling platforms and high-temperature heavily corrosive process equipment.
IV. Product Advantages
1. Formed through both cold forging and hot forging processes, with precise and smooth threads, uniform locking force, and resistance to thread stripping or loosening under long-term working conditions;
2. Covers multiple national and international industry standards, and can be matched with carbon steel flanges, stainless steel flanges, overlay-welded composite flanges, and full ranges of marine panels;
3. Comprehensive length specifications are available, suitable for flanges with different wall thicknesses, bulkheads, and equipment installation spaces;
4. The stainless steel body provides full rust and corrosion resistance, matches composite anti-corrosion pipeline materials, and avoids hidden risks of local rusting and leakage;
5. Excellent vibration and impact resistance ensures strong sealing stability in shipbuilding and continuous industrial operation scenarios.