Special Washer includes tab and keyed washers, counter sunk washers, and spring tension washers. This category is called what?

Special Washer includes tab and keyed washers, counter sunk washers, and spring tension washers. This category is called what?

• A. Lock Washer
• B. Special Washer
• C. Plain Washer
• D. Spring Washer

Answer: (B)

Washers are grouped by how they function in an assembly. Plain washers are just flat spacers, lock washers are designed to resist loosening, and spring washers provide a developing preload. The items described—tab and keyed washers, counter sunk washers, and washers that provide spring tension—have specialized features that go beyond the basic spacer or locking roles. Tab and keyed washers use a tab or a key to prevent rotation and to align parts precisely. Counter sunk washers are shaped to sit flush with a countersunk head or surface, ensuring proper seating and appearance. Spring tension washers are used to apply a controlled preload in the joint. Because these forms are tailored for particular applications and require specific geometries or functions, they’re categorized as Special Washers rather than the more general types.

Washers are grouped by how they function in an assembly. Plain washers are just flat spacers, lock washers are designed to resist loosening, and spring washers provide a developing preload. The items described—tab and keyed washers, counter sunk washers, and washers that provide spring tension—have specialized features that go beyond the basic spacer or locking roles. Tab and keyed washers use a tab or a key to prevent rotation and to align parts precisely. Counter sunk washers are shaped to sit flush with a countersunk head or surface, ensuring proper seating and appearance. Spring tension washers are used to apply a controlled preload in the joint. Because these forms are tailored for particular applications and require specific geometries or functions, they’re categorized as Special Washers rather than the more general types.