1. Technical Specifications for Kitchen Fasteners

1. Standard Classification: Industrial standards divide kitchen fasteners into ISO (International Standard) and GB (Chinese National Standard) systems. Stainless steel screws in sizes M3-M6 are the most commonly used.
2. Material Requirements: Food-grade 304 or 316 stainless steel is mandatory. It must feature high-temperature resistance and corrosion resistance, operating within a temperature range of -20°C to 300°C.
3. Mechanical Performance: Premium fasteners meet strength class 8.8 or higher. Threads are formed by thread rolling to guarantee precise tolerances.

2. Selection Strategy for Functional Fasteners

1. Self-tapping screws: Suitable for sheet metal thinner than 1.5mm. The tapered lead angle reduces material stress concentration.
2. Machine thread screws: Used with pre-tapped holes, delivering high shear strength (≥400MPa).
3. Anti-loosening design: Structures such as nylon inserts and double nuts effectively prevent loosening under vibration.

3. Full Lifecycle Management Guidelines

1. Installation Specifications: Use a torque wrench to control preload. Recommended torque: 1.2–1.5 N·m for cast iron pots and 0.8–1.2 N·m for stainless steel cookware.
2. Maintenance Schedule: Inspect thread engagement every 6 months. Shorten the interval to 3 months for high-temperature working environments.
3. Failure Judgment: Replace the fastener immediately when visible thread wear or slot deformation exceeding 0.2mm occurs.

4. Solutions for Special Working Conditions

1. Enamel cookware: Choose flat head screws fitted with copper washers to avoid damage to the enamel coating.
2. Pressure cooker applications: Must use PED-certified pressure-bearing fasteners, with burst pressure at least 3 times the working pressure.
3. Induction cooker compatibility: Non-magnetic 316L stainless steel is adopted to prevent thread seizure caused by eddy current heating.

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