How to find the right Mounted Rigging Blocks AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Mounted Rigging Blocks
- Mount rating, not just block rating
- The fasteners and the mounting surface must carry the full resultant load, which is up to twice the line pull at a 180-degree wrap. Fixed-mount pulleys usually fail at the bolts or the structure, not at the sheave.
- Line angle relative to the mount
- Rigid mounts should take load in their designed direction. Use a swivel mount if the pull angle changes. Side loading a fixed bracket bends the sheave pin and side plates.
- Sheave and groove for the rope
- Match the groove to the rope diameter and type. Use steel for wire rope and smooth nylon or aluminium for fibre rope. A wrong groove destroys the rope quickly in fixed installations that see repeated cycles.
- Bearing and corrosion resistance
- Use sealed bearings and stainless or galvanised hardware for outdoor or marine mounts. Permanently mounted blocks are rarely maintained, so seized sheaves are common.
Brands that matter
- Crosby: Industrial blocks with published ratings.
- Harken: Marine blocks for fibre rope, including fixed-mount versions.
What to avoid
- Mounting into drywall or plasterboard, or into thin sheet metal, without a structural backer
- Wall or ceiling pulleys with no stated working load limit, used for overhead lifting