Which fastener is specialized for safety wire applications due to its drilled head?

Which fastener is specialized for safety wire applications due to its drilled head?

• A. Clevis Bolt
• B. Eye Bolt
• C. Fillister
• D. Plain Washer

Answer: (C)

When you use safety wiring, you need a hole in the fastener head so the wire can pass through and be twisted with another fastener to prevent loosening from vibration. A fillister head fastener is the type that is designed with a drilled head for this purpose, making it the go-to choice for safety-wire applications. The other options don’t provide a head that’s meant to be drilled for safety wire, or aren’t the kinds of fasteners used with safety wiring (for example, a clevis bolt, an eye bolt, or a plain washer don’t center on a drilled head for this purpose). So the drilled-head fillister fastener best fits the requirement.

When you use safety wiring, you need a hole in the fastener head so the wire can pass through and be twisted with another fastener to prevent loosening from vibration. A fillister head fastener is the type that is designed with a drilled head for this purpose, making it the go-to choice for safety-wire applications. The other options don’t provide a head that’s meant to be drilled for safety wire, or aren’t the kinds of fasteners used with safety wiring (for example, a clevis bolt, an eye bolt, or a plain washer don’t center on a drilled head for this purpose). So the drilled-head fillister fastener best fits the requirement.