DMM Large Impact Block

The DMM Large Impact Block is a rigging block built for the heavier end of arborist work, where big pieces and dynamic loads put real force on the redirect. It hangs from a sling on the anchor and gives the rigging line a smooth, efficient path to the lowering device.

Heavy rigging with the Impact Block

On big removals, the redirect point takes the most punishment. The block sees roughly twice the line load because the rope pulls from both sides, and a piece that drops before the catch adds more. A large block built for impact loading gives you margin where you need it most.

Pair it with rope inside DMM's listed diameter range, a sling rated for the load, and a lowering device sized to match. Keep drops short, let the rope run a little to soften the catch, and choose sound anchors. Check DMM's published ratings for the large size before planning a lift.

Larger blocks are heavier, so most climbers send them up on a line once the anchor sling is set rather than wearing them while climbing. Plan the setup before you go up so the block, sling, and lowering device are matched and ready.

Inspection

Before every job, check the side plates for cracks or bending, the axle and fasteners for looseness, and the sheave for smooth rotation and wear grooves. Retire it after a fall onto a hard surface or an overload. See other sizes in our rigging blocks.

Rigging forces are dynamic and can be several times the weight of the piece. Follow the manufacturer's ratings and ANSI Z133, inspect every component before the job, and keep rigging work to trained crews.