Cable pulley is the finest trolley for the ropes course and zip line industry.
The Robertson SR-71 Tandem Zip Pulley Trolley is a cable pulley that represents the most advanced design work using state of the art engineering techniques to build the safest and finest trolley for the ropes course industry. The 304 stainless steel frame is .101 thick for superior strength and trouble free use. It is assembled using machined 304 stainless axles which gives it unparalleled structural integrity. The SR-71 uses an additional back-up axle for safety, producing superior stability. The sheaves are 2" in diameter and case hardened to 56-58 Rockwell and ride on sealed ball bearings to provide excellent wear characteristics in challenging outdoor environments. Built for 3/8" and 1/2" diameter cable. Independent test rated to 19,000 lbs /84kn
Exceeds A.N.S.I., OSHA, and NFPA class G standards
The Robertson SR-71 Tandem Zip Pulley Trolley is a cable pulley that represents the most advanced design work using state of the art engineering techniques to build the safest and finest trolley for the ropes course industry. The 304 stainless steel frame is .101 thick for superior strength and trouble free use. It is assembled using machined 304 stainless axles which gives it unparalleled structural integrity. The SR-71 uses an additional back-up axle for safety, producing superior stability. The sheaves are 2" in diameter and case hardened to 56-58 Rockwell and ride on sealed ball bearings to provide excellent wear characteristics in challenging outdoor environments. Built for 3/8" and 1/2" diameter cable. Independent test rated to 19,000 lbs /84kn
Exceeds A.N.S.I., OSHA, and NFPA class G standards