Which hook angles are standard for most bars, except where specified?

Which hook angles are standard for most bars, except where specified?

• A. 180 degree and 90 degree
• B. 135 degree and 90 degree
• C. 180 degree and 135 degree
• D. 90 degree and 60 degree

Answer: (A)

Hook angles are chosen to anchor bars securely in concrete and prevent withdrawal. For most bars, the standard hooks are a full 180-degree turn and a right-angle (90-degree) bend. The 180-degree hook turns back toward the embedded length, creating a strong anchorage and helping develop bond between steel and concrete. The 90-degree hook provides a compact, effective anchorage that fits into tighter spaces or around forms while still preventing movement. When a project calls for a different configuration, it’s specified in the drawings or specs, such as 135 degrees or 60 degrees. So, the usual default is 180-degree and 90-degree hooks.

Hook angles are chosen to anchor bars securely in concrete and prevent withdrawal. For most bars, the standard hooks are a full 180-degree turn and a right-angle (90-degree) bend. The 180-degree hook turns back toward the embedded length, creating a strong anchorage and helping develop bond between steel and concrete. The 90-degree hook provides a compact, effective anchorage that fits into tighter spaces or around forms while still preventing movement. When a project calls for a different configuration, it’s specified in the drawings or specs, such as 135 degrees or 60 degrees. So, the usual default is 180-degree and 90-degree hooks.