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Single Rope Technique A5 811 L

Version A Version B
Version A Version B

Overview


Version A
(A5 811 R)
(#736)

Front View Rear View
Front View Rear View
 
Front View: Open for Rigging Rear View: Open for Rigging
Front View: Open for Rigging Rear View: Open for Rigging

Technical Details

I acquired my Single Rope Technique A5 811 R in 2017 as part of Bob Thrun's collection.

My A5 811 R, Version A is 76 mm. long, 83 mm. wide, 26 mm. high, and weighs 229 g. The body is milled from an aluminum alloy extrusion and then soft anodized. The rope channel is 18 mm. wide. The cam radius increases from 41 to 61 mm. over an angle of 41°, giving a 29° cam angle. The tooth pattern is (4.5)^3(4.3)^2(4.F). A spring-loaded cam safety attached to the bottom tip of the cam doubles as a hold-open latch. The cam axle is a semi-tubular rivet.

The inside of the body is stamped with "AUSTRALIA," "SRT" inside a map of Australia, and "PATENTED," all inside a circle. The cam has a raised up-pointing arrow labeled "UP" in raised letters and a raised kangaroo icon.

Comments

Single Rope Technique makes four rope grabs, or as they call them, "fall arrest ascenders." This is the model A5 811 L, the left-hand model for ropes up to 11 mm. The A5 816 rope grabs handle ropes up to 16 mm. The Single Rope Technique rope grabs tend to be lighter than the others in my collection. They are similar to the Single Rope Technique A3 ascenders, but the placement of the attachment holes precludes their use as an efficient ascender. The frame rotates under load, putting a 90 degree bend in the rope (the inside of the rope channel is rounded so that the rope doesn't cut).


Version B
(A5 811 L)
(#736)

Front View Rear View Top View
Front View Rear View Top View
 
Front View: Open for Rigging Rear View: Open for Rigging
Front View: Open for Rigging Rear View: Open for Rigging

Technical Details

I acquired my Single Rope Technique A5 811 L from Single Rope Technique in 2000.

My A5 811 L is 76 mm. long, 83 mm. wide, 26 mm. high, and weighs 234 g. The body is milled from an aluminum alloy extrusion and then soft anodized. The rope channel is 18 mm. wide. The cam radius increases from 41 to 61 mm. over an angle of 41°, giving a 29° cam angle. The tooth pattern is (3.4)^2(5.4)^2(3.4)^2(F). A spring-loaded cam safety attached to the bottom tip of the cam doubles as a hold-open latch. The cam axle is a semi-tubular rivet.

The inside of the body is stamped with "AUSTRALIA," "SRT" inside a map of Australia, and "PATENTED," all inside a circle. The cam has a raised up-pointing arrow labeled "UP" in raised letters and "S R T" in raised letters.

Comments

Single Rope Technique made four rope grabs, or as they call them, "fall arrest ascenders." This is the model A5 811 L, the left-hand model for ropes up to 11 mm. The A5 816 rope grabs handle ropes up to 16 mm.

My A5 811 L has different cam markings than my A5 811 R, and the tooth pattern is different as well.

The Single Rope Technique rope grabs tend to be lighter than the others in my collection. They are similar to the Single Rope Technique A3 ascenders, but the placement of the attachment holes precludes their use as an efficient ascender. The frame rotates under load, putting a 90 degree bend in the rope (the inside of the rope channel is rounded so that the rope doesn't cut).