Loft Blocks

Loft Blocks

Underhung loft block, with notched side plate for mounting to a single beam. Cast iron or nylon sheaves; 8″ and 12″ diameter.

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19 Series

  • Underhung style, supported by a single structural beam
  • Nylon or ASTM Class 30 grey iron sheaves
  • Sealed precision ball bearings (Single line 8" nominal sheave only) or tapered roller bearings
  • 10 gauge side plates.
  • 3/4" drawbolt and steel clip allow a 4" grip adjustment to accommodate a range of beam sizes.
  • A minimum of three spacers between the side plates; to prevent cables from escaping the sheave grooves.

55, 56 & 59 Series

  • May be mounted upright or underhung.
  • May be supported by I-beams, grid wells, or Unistrutâ„¢.
  • Nylon or ASTM Class 30 grey iron sheaves are available. Nylon sheaves are quieter, have a higher capacity, lower weight, and lower cost than blocks with cast iron sheaves.
  • 8" blocks have a 24" base angle with a continuous pattern of holes and slots for universal mounting for a grip range up to 20". Multi-line block base angles have a series of mounting holes.
  • 8-Line blocks have the base angles turned in, requiring different upright and underhung models.
  • A clip package is available for single line blocks with a combination of J-bolts and clips for both underhung, and upright mounting options.
  • Sealed precision ball bearings (Single line, 8" nominal sheave only) or tapered roller bearings
  • Side plates fully enclose sheave.
  • Five spacer between the side plates, three of which prevent cables from escaping the sheave grooves
  • Pivot adapters (070-PIVOT) are available for single line 8" blocks used in applications where the mounting surface is sloped.
  • Underhung loft blocks may need to be welded to loft beams after final alignment - consult the factory for specific information.

Loft Block Idlers

  • Idlers may be added to underhung loft blocks to carry the weight of the cables and prevent rubbing against adjacent block side plates. They are not intended to carry line loads or to act as deflector or mule blocks.
  • Idler assemblies consist of one or two 3-1/2 inch diameter, 3 line Nylon sheaves mounted on the side of the loft block in a steel housing.
  • Idler sheaves have 1/4 inch cable grooves with a 3/8-inch shaft in a 12-gauge steel housing with two 1/4 inch bolts and pipe spacers to mount the housing and captivate the cables in the grooves.
  • When using idler pulleys, the loft block closest to the head block should be a full size multi-line block with grooves for all of the lift lines. This ensures that fleet angle and other alignment stresses are not transferred to the idler pulleys.

Loft Block Pivot Bracket

      • Pivot Brackets are required for mounting on loft beams with more than 1-1/2° of slope.
      • Use for beams 4" - 8-1/2" wide for single line 55 series blocks).
      • Mounting clips are included, please specify beam flange thickness

Pivot brackets must be welded to loft beams after final alignment - consult the factory for specific information

Custom Blocks

  • We can design custom blocks to meet your specific requirements.
  • Nylon, steel, or ASTM Class 30 grey iron sheaves are available.
  • Blocks may contain one or more sheaves. Sheaves can be mounted on a single axle or mounted in a tandem configuration for use in upgrading historic theaters and for use with drum hoists that must be mounted close to the head blocks.
  • Base angles or other mounting methods to meet your requirements.

Multi-Sheave Blocks

  • Blocks may be mounted upright or underhung.
  • Blocks with three or more sheaves are constructed with the base angle legs turned in to allow close mounting centers. Base angles are notched to clear ropes and cables.
  • Nylon or ASTM Class 30 grey iron sheaves.
  • 17mm sealed precision ball bearings.
  • 12 gauge side plates located outside and between sheaves.

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