When using a blind hole eyebolt, what must the depth be in relation to the thread diameter?

When using a blind hole eyebolt, the depth must be 1.5 times the thread diameter to ensure that the eyebolt has adequate engagement with the material, providing necessary strength and safety during lifting operations. This specific depth helps to minimize the risk of the eyebolt pulling out of the hole under load, as it allows for sufficient thread engagement that can withstand the forces exerted during lifting.

Ensuring the blind hole is 1.5 times the diameter also accounts for variations in material conditions and helps in maintaining the integrity of the connection. By following this standard, riggers can adhere to safe practices that enhance stability and operational reliability.

In contrast, other depth ratios mentioned do not provide the same level of security and can result in inadequate support during lifting, which could lead to failures or dangerous situations. Thus, the specific requirement of 1.5 times the thread diameter is a critical safety measure in rigging operations.