Design, Manufacture and Installation of Theatrical Equipment Worldwide

Head Blocks, Underhung - 59 Series

Underhung Head Block
Underhung Head Block
100-61259C25

  • Underhung style, normally supported by two structural I-beams.
  • ASTM Class 30 grey iron or nylon sheave.
  • Equal pitch diameter on rope and cable grooves for smooth operation.
  • Tapered roller bearings.
  • Base angle legs turned in to allow close mounting centers.
  • 10 gauge side plates fully enclose sheave; 16" blocks have 7 gauge side plates.
  • Side plates are bolted and welded to the base angles for extra strength.
  • Six spacers between the side plates, three prevent cables from escaping the sheave grooves.
  • Base angles punched with alternating slots and holes for simple easy installations.
  • Mounting clips available, please provide steel dimensions.
  • Underhung blocks may need to be welded to head beams after final alignment. Clip angles are recommended for double beam mounting. Mounting with clips or to single beams will require welding. Consult the factory for specific information.
  • Head block capacities are affected significantly by mounting conditions, see the “More Info” tab for tables of capacities

Ordering Information
Sheave Rope
Diam.
Lines Bearing Cast Iron
Prod. Code
Wt. Nylon
Prod. Code
Wt. RWL (capacity)
Single Purchase
8" 3/4" 6 @ 1/4" 1" 100-60859C25 46 lb table
8" 3/4" 8 @ 1/4" 1" 100-80859C25 52 lb table
12" 3/4" 6 @ 1/4" 1" 100-61259C25 72 lb 100-61259N25 40 lb table
12" 3/4" 8 @ 1/4" 1" 100-81259C25 79 lb 100-81259N25 41 lb table
12" 3/4" 10 @ 1/4" 1" 100-101259C25 86 lb table
16"
1" 6 @ 3/8" 1-1/2" 100-61659C381 139 lb table
16" 1" 8 @ 3/8" 1-1/2" 100-81659C381 147 lb table
Double Purchase
12" 3/4" 6 @ 1/4" 1" 1CD-61259R 72 lb 1ND-61259R 40 lb table
12" 3/4" 8 @ 1/4" 1" 1CD-81259R 79 lb 1ND-81259R 41 lb table

Wire Guide Blocks: Change the "R" suffix to "W" in the part number for blocks with tieoffs for arbor wire guides.
 
Tieoffs: Tieoffs for wire guided clews are also available.
 
RWL: The recommended working load (RWL) is maximum load that can be applied to a block which is in "like new" condition and has been properly installed, maintained and operated. The mounting of the head block has a major effect on the RWL, as shown in the tables. There are separate tables for beam angles, beam clips, and welding the block to the head beams.
 
 
 
 
 
7041 Interstate Island Road | Syracuse, NY USA 13209-9713 | Phone: 315-451-3440 | Toll Free: 800-836-1885
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