How Do I Properly Tighten the Screw Pin on an Anchor Shackle?
How Do I Properly Tighten the Screw Pin on an Anchor Shackle?
May 12, 2020
mazzellacompanies.com
Ever seen what happens when a shackle takes a side load it wasn’t built for? We tested a 3/4” Oceanside bolt pin shackle—rated at 9,500 lbs working load with a 6:1 design factor—and cranked it sideways until failure at just 48,700 lbs, way below its expected straight-pull strength. The body warps, the pin bends, and it all gives way in a tense, metal-twisting spectacle. This is the hidden risk in rigging: Side loading slashes capacity and turns solid gear into hazards. In the field, alignment is
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According to ASME B30.26 Rigging Practices section, it is required that screw pin threads are fully engaged and tight, and the pin shoulder is in contact with the shackle body. The old practice of tightening a screw pin shackle, so it is hand-tight and then backing it off an eighth to a quarter of a turn is not allowed per the ASME B30.26 standard. Nor does it comply with the shackle manufacturer's recommendations. This will definitely ruffle some feathers out there as many if not most, riggers
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