Grade 100 Two-Leg Chain Sling with Sling Hooks — Type DOS

Grade 100 two-leg chain sling made up with an oblong master link at the top and a sling hook with safety latch on each of the two legs. The chain and every fitting are Grade 100 alloy steel, quenched and tempered, and matched in size so that no component is the weak point.

What DOS means

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

Sizes and ratings

11 chain sizes, 6 mm to 26 mm. Working load limit 2 to 37.5 t with the legs up to 45° from vertical, and 1.4 to 26.5 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.

Grade 100 against Grade 80

Grade 100 chain carries about 25% more than Grade 80 chain of the same diameter, so a given load can often be lifted on a sling one chain size smaller and lighter. The table gives the standard Grade 100 ratings, worked on the same method as EN 818-4. Chain above 26 mm is made to order and its rating is confirmed on the quotation.

Choosing this make-up

A sling hook is the general-purpose end fitting: the spring latch closes the throat so the hook cannot slip off a slack lifting point.

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 hook, or send the load, the number of lifting points and the headroom and we will size the sling for you.