When using anchor bolts with deformed ends, what is the required length of the bent leg?

The requirement for the length of the bent leg of anchor bolts with deformed ends is specified as four times their diameter. This length is essential for ensuring that the bolt achieves proper anchorage in the concrete, providing adequate bond strength to resist pull-out forces and shear loads.

When the bent leg of the anchor bolt is at least four times the diameter, it helps to engage a sufficient amount of concrete, allowing for better load distribution and enhancing the overall stability of the bolted connection. This guideline is adhered to in various industry standards and codes, where it ensures that the anchor can perform effectively under different loading conditions.

The other options suggest lengths that are not required or typical for this type of fastener in most applications, leading to unnecessary material use or ineffective anchorage configurations. Thus, the specification of four times the diameter is both practical and well-established in millwright practices.