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How often should screws be reinspected after storage?

The following comprehensive recommendations for screw storage reinspection cycles are compiled based on engineering machinery and automotive industry standards:

I. Standard Reinspection Cycles

Unused New Screws

Carbon steel screws: Inspect rust prevention status every 3 months; reduce to monthly in humid environments

Stainless steel screws: Inspect surface oxidation every 6 months

Used Screws

Critical load-bearing components (e.g., construction machinery chassis bolts): Re-inspect preload every 5,000 kilometers or 3 months.

Standard fasteners: Inspect thread integrity every 6 months.

II. Adjustments for Special Conditions

Environmental Factors

High humidity/salt spray environments: Reduce carbon steel bolt re-inspection cycles by 50%.

High-temperature environments: Inspect thread sealant aging (e.g., engine compartment bolts).

Material Differences

Iron screws: Mandatory replacement every 1-2 years

Stainless steel screws: Replacement every 3-5 years

III. Re-inspection Key Points

Inspection Items

Thread wear (detected using thread gauges)

Surface corrosion (carbon steel screws with corrosion depth >0.1mm require replacement)

Preload (verified using torque wrenches)

Maintenance Recommendations

Clean and reapply rust-preventive oil to screws after removal

Screws stored for over 1 year should undergo tensile strength testing