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A D-ring used to secure cargo in a utility trailer (A) D-ring (shown in isometric view) (B) Weld-on pivot link; note the incorrect fillet weld call-out (bottom-right). The correct method of securing a weld-on pivot link is a [t weld] which consists of a perpendicular vee butt joint secured to the billet using a butt weld or fusion weld.
This is particularly important for light, modern anchors designed to bury in the bottom, where scopes of 5:1 to 7:1 are common, whereas heavy anchors and moorings can use a scope of 3:1, or less. Some modern anchors, such as the Ultra holds with a scope of 3:1; [ citation needed ] but, unless the anchorage is crowded, a longer scope always ...
The harness is fitted with several heavy duty D-rings, fixed to the webbing in such a way that the full weight of the diver and all their equipment can be safely supported. A minimum strength for a safe working load of 500 kgf is recommended or required by some codes of practice.
The heavy harbour moorings have three chains extending out radially along the seabed from a central ring, each terminating in a large anchor. Most harbours have a soft seabed, and it is usual to lay down moorings by settling anchors in the mud, clay or sand, but this could not be done in Gibraltar harbour where the seabed is hard rock. [5]
Hex head fasteners: Known for their high torque capacity, hex head fasteners are easily driven with a spanner or wrench, ideal for heavy-duty applications. Square head fasteners: Offering increased wrenching area and reduced risk of rounding off, square head fasteners are used in high torque applications.
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