What factors should be considered when choosing a Stainless Steel Flange Bolt?

1. Material and corrosion resistance
Material type: Common ones include austenitic stainless steel such as 304, 316, martensitic stainless steel and ferritic stainless steel. 304 stainless steel has good corrosion resistance and processability, and is suitable for general industry and food industry. 316 stainless steel has better corrosion resistance, atmospheric corrosion resistance and high temperature strength due to the addition of molybdenum, and is often used in harsh corrosive environments such as marine equipment and chemical industry.
Working environment: If the bolt is in a corrosive medium such as moisture, acid and alkali, or is exposed to the atmosphere for a long time outdoors, a stainless steel material with strong corrosion resistance should be selected, such as 316L and other low-carbon stainless steel, to prevent the bolt from rusting and corroding, affecting the reliability of the connection and the service life of the equipment.
2. Mechanical properties
Strength grade: Select the appropriate strength grade according to the load size of the connection part, such as A2-70, A4-70, etc. Conventional strength grade bolts can be used for the connection of general equipment, while for important structural connections that bear large tension, pressure or shear force, high strength grade bolts, such as 8.8, 10.9 or higher grades, need to be selected to ensure the safety of the connection.
Hardness and toughness: The hardness should be moderate. Too hard may cause the bolts to break easily during installation or use, while too soft may not meet the tightening requirements of the connection. At the same time, the bolts should also have a certain toughness to withstand impact and vibration without breaking.
3. Size and specifications
Bolt diameter: Determine the bolt diameter based on factors such as the aperture of the flange and the thickness of the connecting parts to ensure that the bolts can fit tightly with the flange hole and have sufficient bearing area.
Bolt length: The length of the bolt should be determined based on factors such as the total thickness of the connecting parts, the thickness of the gasket, and the thickness of the nut. Generally, the threaded part of the bolt should be exposed 2-3 pitches of the nut to ensure the tightness of the connection.
4. Installation and use requirements
Installation method: If it is manual installation, you can choose ordinary hexagonal flange bolts; if it is automated installation, you may need to choose bolts with head shapes suitable for automatic tightening tool operation, such as hexagonal flange bolts, etc.
Anti-loosening requirements: For bolts used on equipment or structures with large vibrations, their anti-loosening performance needs to be considered. You can choose stainless steel flange bolts with anti-loosening devices, such as nylon insert self-locking nuts, slotted locking nuts, etc., or use anti-loosening washers.
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