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Front View: Closed Rear View: Closed
Front View: Closed Rear View: Closed
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 SUT from Suntek in 2017.

Cam faceThe SUT is 116 mm. tall, 80 mm. wide, 39 mm. thick, and weighs 160 g. The ascender shell is a subtriangular orange anodized aluminum stamping 3.75 mm. thick. The rope channel is formed by bending the right side of the ascender into a U. The rope channel is 15 mm. wide. The main sling attachment point is located below the cam and behind the rope channel. A second attachment point is located above the cam and also behind the rope channel. The shell is bent backwards at both points to provide clearance between the attachment slings and the main rope. This accounts for the rather large thickness of this ascender. The lower attachment point measures 27.2 by 19.0 mm. and the upper 23.8 by 17.3 mm. The left end of the shell is bent on an inclined axis to form another U. A hole drilled through both sides of the U accepts a semi-tubular rivet. The cam, cam spring, and a spacer washer are mounted on this rivet. The head of the rivet sits into a stamped depression on the back of the cam, while the roll is exposed on the open side. The pivot is centered 43 mm. from the inside of the rope channel. There is a cam stop punched in the shell above the cam, but it is placed where it does not touch the cam when the ascender is off rope.

The cam is a skeletonized casting covered with black paint. The cam radius increases from 37 to 57 mm. over an angle of 40°, giving a 31° cam angle. The cam has number of small conical teeth, all of which have their axes sloping slightly downward with respect to the cam face. The tooth pattern is (3)(4.H)^2(3.H)^2(3.2.2) where an "H" represents a mud relief hole. A spring-loaded manual safety bar is mounted on the bottom of the cam. The normal action of the spring holds the safety against the cam. When the cam is opened, the shell interferes with the safety bar, thus preventing opening the cam. If the safety bar is moved away from the cam (opposing the spring), it will clear the shell and the cam will open. At full open the safety can be released and the spring will hold the safety against the back of the shell. This provides a means of locking the cam open. A bent tab on the safety bar assists in operating the safety mechanism.

The front is printed with an up-pointing arrow, "UP," "MAX 4kN, the SUT logo, and anchor-over-a-"Z" logo, "HN" between two filled semicircles, "CE 1019," "EN 567," and "ROPE 10≤Ø≤13MM."


I feel that this is a well made ascender. All sharp edges have been removed. The cam teeth are rather well done, though not quite as well as some of my older Petzl’s. I don't like the black paint on the cam. The cam stop is useless in practice; its only role is to inflate the strength of the ascender in the artificial tests prescribed by various standards.

The SUT is essentially the same as the NewDoar Version B.

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