Rigging Hardware

A rig is only as strong as its weakest fitting. Match component ratings through the whole chain of connections: the master link, the sling, the shackle, the lifting point on the load. One undersized connector sets the limit for the whole lift, whatever the sling tag says.

Collared (shoulder) lifting eye bolts with metric thread, rated for a straight in-line pull.

Manufacturer's published figures for collared lifting eye bolts (Beaver). These are straight-pull numbers. Any angle on the pull cuts them hard, so check the maker's angle table before lifting off-axis, and treat an unmarked eye bolt as not rated.

A plain eye bolt, no. Straight in-line pulls only. A collared eye bolt can, at a heavily reduced working load limit the manufacturer publishes. For repeated angled or rotating loads, use a swivel lifting point instead.

An eye bolt is a fixed eye on a thread. A lifting point is a rated fitting designed for lifting from the outset, usually able to swivel or pivot toward the pull, so the load comes on the fitting the way it was designed to.

Only if it's a rated one with a marked working load limit. Commercial turnbuckles are for tensioning wire and staying put, not for suspended loads.

Clean, undamaged threads of the right size, screwed in to full engagement, with the collar seated square and flush on a flat bearing surface, shimmed if the surface isn't flat. Line the plane of the eye up with the direction of pull, and check the WLL for the angle you're pulling at, not just the straight-line figure.