I. Product Function
1. Dedicated fasteners for equipment molds, pressure vessels, composite pipeline flanges, marine components, and precision machinery sealing and fastening;
2. Suitable for assembly in narrow installation spaces. Locked with a hex socket wrench, they are widely used in chemical engineering, seawater desalination, photovoltaic systems, steel structures, and complete equipment sets;
3. Used as sealing connectors for lined / overlay-welded composite pipe fittings, stainless steel pipeline supports, valves, and storage tank inlet and outlet connections.
II. Specification and Standard Parameter Table
Parameter Item | Production Range / Optional Type |
Applicable Standard | DIN 912, GB/T 70.1, ISO 4762, ASME B18.3 Table 1 |
Metric Size Range | Cold forged: M4–M36; hot forged: M39–M42 |
Imperial Size Range | Cold forged: 8#–1-3/8"; hot forged: 1-1/4"–1-1/2" |
Forming Process | Cold heading, precision thread rolling, and one-step forming of the hex socket hole |
Surface Treatment | Stainless steel pickling and passivation, mirror polishing |
Available Materials | 304, 316L, 321, and 2205 duplex stainless steel |
Standard Length Range | M3–M4: 5–65mm; M5: 6–130mm; M6: 8–150mm; M8: 10–280mm; M10: 14–280mm; M12: 16–280mm; M14–M16: 20–300mm; M18–M20: 30–300mm; M24: 35–280mm; M27: 50–300mm; M30–M36: 60–260mm |
III. Material Application Scenarios
1. 304 stainless steel: suitable for indoor freshwater pipelines, general mechanical equipment, and non-corrosive normal-pressure working conditions;
2. 316L stainless steel: suitable for marine seawater pipelines, coastal desulfurization systems, and flange assembly in high-salt-spray corrosive environments;
3. 321 stainless steel: suitable for high-temperature heat exchange equipment and high-temperature fastening points of steam pipelines;
4. 2205 duplex stainless steel: suitable for offshore platforms and medium acid-alkali high-pressure corrosive equipment.
IV. Product Advantages
1. The cylindrical head with built-in hex socket structure occupies less installation space, making it suitable for narrow cavities and enclosed equipment assembly;
2. The hex socket wrench provides uniform force application and high locking torque, helping prevent loosening of high-pressure flanges and heavy equipment;
3. The stainless steel body resists acids, alkalis, and salt spray corrosion, and can be matched with composite anti-corrosion pipelines to avoid galvanic corrosion;
4. Precision rolled threads provide a complete thread profile and smooth engagement with nuts, preventing thread stripping under long-term vibration conditions;
5. Specifications cover full-size cold-forged and hot-forged ranges, and can be supplied as complete sets with flanges, composite pipe fittings, and pressure vessels.