The bending shackle is associated with which angle as listed in the reference?

The bending shackle is associated with which angle as listed in the reference?

• A. 28.4 deg
• B. 30 deg
• C. 45 deg
• D. 60 deg

Answer: (A)

The main idea here is how the bend angle through a shackle changes the load on the shackle pin. When a line passes through a shackle to lift or secure a load, the line forms an angle at the shackle, and that angle affects how the load is shared and how much stress acts on the pin. The standard rigging reference used for this exam specifies a bending shackle angle of 28.4 degrees. This exact value is used in their published load factors for shackles under bending, so it’s the correct angle to cite in calculations for this item. The other common angles (30, 45, 60 degrees) aren’t the value listed in that reference, even though they may appear in other contexts.

The main idea here is how the bend angle through a shackle changes the load on the shackle pin. When a line passes through a shackle to lift or secure a load, the line forms an angle at the shackle, and that angle affects how the load is shared and how much stress acts on the pin. The standard rigging reference used for this exam specifies a bending shackle angle of 28.4 degrees. This exact value is used in their published load factors for shackles under bending, so it’s the correct angle to cite in calculations for this item. The other common angles (30, 45, 60 degrees) aren’t the value listed in that reference, even though they may appear in other contexts.