I. Product Function
1. Used together with various bolts, studs, tie rods, and U-bolts. It engages with bolt threads to achieve locking and fastening, providing fixed sealing for flanges, steel structures, pipe supports, and equipment components;
2. Supporting fastener accessory for complete fastening systems in water supply and drainage, chemical desulfurization, seawater desalination, marine composite pipelines, and steel structure workshops;
3. Locking nut for tensioning and fixing pressure vessels, storage tanks, photovoltaic supports, curtain wall keels, and light steel purlins;
4. Suitable for sealing and fastening high-pressure flanges and lined / overlay-welded composite pipe fittings, covering all working conditions from normal pressure to high pressure and from indoor environments to marine corrosion environments.
II. Specification and Standard Parameter Table
Parameter Item | Production Range / Optional Type |
Applicable Standard | GB/T 6170, DIN 934, ISO 4032, ASME B18.2.2 |
Metric Size Range | M3–M64, covering the full range of matching sizes for cold-forged and hot-forged threaded rods |
Imperial Size Range | 5#–2-1/4" |
Forming Process | Cold forging and stamping, hot forging with quenching and tempering, and precision tapping of internal threads |
Surface Treatment | Zinc electroplating with blue-white zinc, hot-dip galvanizing, black oxide treatment, and stainless steel pickling and passivation |
Available Materials | Q235, grade 4.8 / 8.8 / 10.9 / 12.9 carbon steel; 304, 316L, and 2205 duplex stainless steel |
Matching Accessories | Matching bolts, fully threaded studs, double-end studs, U-bolts, and steel structure tie rods of the same specification |
III. Material and Surface Treatment Application Scenarios
1. Grade 4.8 / 8.8 zinc-plated carbon steel: suitable for indoor dry workshops, normal-pressure water supply and drainage systems, and indoor sections of photovoltaic supports;
2. Grade 10.9 / 12.9 quenched and tempered blackened carbon steel: suitable for high-temperature and high-pressure steam, oil and gas, and chemical pressure-bearing flanges;
3. Q235 hot-dip galvanized nuts: suitable for outdoor light steel workshops and coastal exposed steel structures requiring long-term rust protection;
4. 304 stainless steel nuts: suitable for exposed freshwater pipelines and non-corrosive municipal pipeline systems;
5. 316L stainless steel nuts: dedicated to ships, seawater desalination, and desulfurization pipelines containing saline corrosion;
6. 2205 duplex stainless steel nuts: suitable for offshore platforms and severe acid-alkali high-pressure corrosive working conditions.
IV. Product Advantages
1. Standard hexagonal shape provides sufficient wrench contact area, ensuring stable force application during installation and removal with reduced risk of slipping;
2. Precision-tapped internal threads feature complete and smooth thread profiles, ensuring tight engagement with threaded rods and resistance to loosening or thread stripping under long-term vibration;
3. Multiple materials and anti-corrosion processes are available and can be matched with corresponding bolts as complete sets to avoid galvanic corrosion between dissimilar metals;
4. Full specification coverage makes them suitable for complete fastening systems in pipelines, steel structures, pressure vessels, and ships;
5. Thickened pressure-bearing models can be used for high-pressure flange sealing, providing excellent tensile and fatigue resistance to ensure long-term leak-free pipeline operation.