Design, Manufacture and Installation of Theatrical Equipment Worldwide

Head Blocks, Upright - 55 Series

Upright Head Block
Upright Head Block
100-81255C25

  • Upright 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. Notches allow clear passage of all cables.
  • 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, four prevent cables from escaping the sheave grooves.
  • Base angles punched with alternating slots and holes for easy installations.
  • Mounting clips available, please provide steel dimensions.
  • 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" 100-60855C25 46 lb table
8" 3/4" 8 @ 1/4" 1" 100-80855C25 52 lb table
12" 3/4" 6 @ 1/4" 1" 100-61255C25 72 lb 100-61255N25 40 lb table
12" 3/4" 8 @ 1/4" 1" 100-81255C25 79 lb 100-81255N25 41 lb table
12" 3/4" 10@ 1/4" 1" 100-101255C25 86 lb table
16" 1" 6 @ 3/8" 1-1/2" 100-61655C381 139 lb     table
16" 1" 8 @ 3/8" 1-1/2" 100-81655C381 147 lb table
Double Purchase
12" 3/4" 6 @ 1/4" 1" 1CD-61255R 72 lb 1ND-61255R 40 lb table
12" 3/4" 8 @ 1/4" 1" 1CD-81255R 79 lb 1ND-81255R 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.
 
 
 
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