기능

• Dimensions are plain washers conforming to JIS B 1256-1963.
• The nominal diameter is the diameter of the external screw used, and the inner diameter of the washer has a slightly larger hole.
• Material is steel with black zinc chromate plating (blackish color) to improve corrosion resistance.
• It is used to distribute the surface pressure when fastening with bolts, small screws, nuts, etc., to prevent damage to the mating member, and to prevent caving when the bottom hole is large.
• It is more corrosion resistant than the fabric and is black, so it is convenient to match the color with the other member.