The SR-71 is a proven performer for zip line operations. The 2009 model is built from .101 thick 304 stainless steel. Unlike the competition it is assembled using machined axles which may cost more but give the SR-71 zip trolley unparalleled structural integrity. Safety is always a primary objective, and the SR-71 zip trolley uses an additional back up bolt should there ever be a catastrophic failure during use. The sheaves are case hardened to a 56-58 Rockwell and spin on ball bearings to provide excellent wear characteristics in challenging outdoor environments. Built to accept two carabiners at the attachment point for extra safety.

SR-71 Blackbird Zip Line Trolley

Breaking strength:             19,000 lbs.

Manufacturer:                    Robertson Mtn., Henderson, NV, USA

Date of manufacture:         12/2009

Overall length:                   5 ¾"

Height:                             5"

Width:                              1 ½" (bolt end to bolt end)

Max cable diameter:           ½"

Min cable diameter:            3/16" (not recommended)

Clearance between wheels:  1 ½"

Wheel diameter:                 1 ½"

Axel spacing:                     3 ½"

Max speed:                       60 mph (60 second max at that speed)

Weight:                             1 lb, 11 oz

Load opening:                    1 ½" x 1" (approx)

Available with or without 'ears' for a back up carabiner.