What are the key factors in selecting hinges or moving parts for foldable outdoor benches?

When selecting hinges and moving parts for foldable outdoor benches, several critical factors determine both functionality and longevity. Material compatibility stands as the primary consideration - stainless steel, aluminum, and galvanized hardware offer superior corrosion resistance against rain, humidity, and temperature fluctuations. The weight capacity must exceed expected loads by at least 25% to prevent premature failure, while self-lubricating bushings reduce maintenance needs in dusty or sandy environments. Weatherproofing features like sealed bearings and waterproof lubricants protect internal components from moisture infiltration. The folding mechanism's design should incorporate safety locks to prevent accidental collapse and smooth operation for user convenience. Additionally, UV-resistant coatings prevent plastic components from degrading under direct sunlight. Properly engineered clearance between moving parts accommodates natural wood expansion during humidity changes, while reinforced connection points distribute stress evenly across the bench structure. Regular maintenance intervals and easy access to replacement parts further extend the product's outdoor service life, making these engineering considerations fundamental to creating durable, reliable outdoor folding furniture.