Which factor primarily determines the twists per inch when using safety wire?

• A. Safety wire diameter
• B. Bolt length
• C. Ambient temperature
• D. Bolt head width

Answer: (A)

Twists per inch is set mainly by the wire diameter. A thinner wire can be twisted into more turns per inch, while a thicker wire cannot be compacted as tightly, giving fewer twists per inch. Bolt length, ambient temperature, or bolt head width don’t determine how many twists fit in a one‑inch span; they may affect fit or tension, but the inherent twist count comes from the wire’s thickness. In practice, you choose the wire size and follow the standard twist per inch guidelines for that size to ensure a secure, uniform wrap.