I. Product Function
1. Fully threaded fasteners specially used for flanges, pressure vessels, composite pipelines, and marine panels. The full-length threaded design is suitable for locking sealing components of different thicknesses;
2. Supporting connectors for corrosion-resistant pipeline flanges in seawater desalination, chemical desulfurization, municipal drinking water systems, and offshore platforms;
3. Complete fastening accessories for high-pressure sealing of overlay-welded composite flanges, lined composite pipe fittings, and storage tank inlet and outlet connections;
4. Suitable for equipment locking under high-temperature, high-salt-spray, acid, and alkali corrosion conditions, and adaptable to installation scenarios involving multiple gaskets and thick flanges.
II. Specification and Standard Parameter Table
Parameter Item | Production Range / Optional Type |
Applicable Standard | GB/T 898, GB/T 899, GB/T 900, GB/T 901 |
Metric Size Range | Cold forged: M5–M36; hot forged: M39–M56 |
Imperial Size Range | Cold forged: 10#–1-3/8"; hot forged: 1-1/4"–2" |
Forming Process | Precision thread rolling of stainless steel bars in one-piece forming |
Surface Treatment | Pickling and passivation, mirror polishing |
Available Materials | 304, 316L, 321, and 2205 duplex stainless steel |
Length Range | Hot-forged models from M16 are available in lengths of 60–500mm; other specifications can be customized according to standard length ranges |
III. Material Application Scenarios
1. 304 stainless steel: a general economical option, suitable for inland freshwater, ventilation, and non-corrosive normal-pressure pipeline flanges;
2. 316L stainless steel: resistant to chloride ions and salt spray, commonly used for ocean-going vessels, coastal sewage systems, and desulfurization pipelines;
3. 321 stainless steel: high-temperature resistant, suitable for sealing flanges in high-temperature steam and heat exchange equipment;
4. 2205 duplex stainless steel: high strength and strong corrosion resistance, suitable for offshore drilling platforms and high-pressure working conditions involving severe acid and alkali corrosion.
IV. Product Advantages
1. The full-length threaded structure allows flexible adjustment of the locking stroke and adapts to combinations of flanges and gaskets with different thicknesses;
2. Made entirely of stainless steel with pickling and passivation treatment, providing full corrosion resistance against rust, seawater, acids, and alkalis, and matching composite anti-corrosion piping materials;
3. Precision rolled threads feature a regular thread profile, enabling smooth nut tightening, resistance to thread stripping, and prevention of loosening under long-term vibration conditions;
4. The headless structure makes installation convenient in narrow cabins and enclosed equipment spaces, suitable for marine and pressure vessel assembly positions with limited space;
5. Matching stainless steel nuts, flat washers, and spring washers of the same material can be supplied as complete anti-corrosion fastening sets to prevent galvanic corrosion.