Grade 80 Two-Leg Chain Sling with Oblong Link Ends — Type DOO

Grade 80 two-leg chain sling made up with an oblong master link at the top and an oblong link at the end of each of the two legs. The chain and every fitting are Grade 80 alloy steel, quenched and tempered, and matched in size so that no component is the weak point.

What DOO means

Chain sling make-ups are named by a letter code read from the top down: D = double leg; O = oblong master link; O = oblong link. So a DOO sling is a double leg sling with an oblong master link at the top and an oblong link at the end of each of its two legs.

Sizes and ratings

21 chain sizes, 4 mm to 50 mm. Working load limit 0.7 to 109.9 t with the legs up to 45° from vertical, and 0.5 to 78.5 t between 45° and 60°, at a 4:1 design factor. Each size has its own Indus part number below.

Reading the two WLL columns

The rating of a multi-leg sling depends on how far the legs spread. The table heads its columns by the angle between opposite legs: "up to 90°" means each leg is no more than 45° from vertical, and "90–120°" means each leg is between 45° and 60° from vertical. A chain sling is never used with its legs more than 60° from vertical. The ratings assume the load is shared evenly between the legs.

Choosing this make-up

A plain oblong link at the working end is for shackling to a lifting lug or for coupling to another fitting on site.

Identification and certificate

Each sling carries a permanent tag with its serial number, chain size, grade, reach and working load limit, and ships with the manufacturer's test certificate. The rating on the tag and certificate is the one that governs the sling in service.

Ordering

Slings are made up to length. Quote the Indus part number for the chain size and the reach you need, measured from the bearing point of the top fitting to the bearing point of the bottom link, or send the load, the number of lifting points and the headroom and we will size the sling for you.