Before construction begins it is recommended that you consult with certified structural engineer for approval of our products within your application. We recommend tightening set screw in the side of the Screw Jack with a 6mm allen wrench prior to loading. This Galvanized Swivel Base Jacks is the standard screw leg for Cuplock and Ringlock Scaffolding. For maximum safe load capacity to be obtained, Ellis Screw Jack should be used with a 6圆 lumber cut to at least 5.5" long and subject to support straight loads only. The screw jack is used as a starting base for a scaffold where the supporting surface of the scaffold is on a slope. The telephone number for the Harbor Freight store in Norfolk (Store 109) is 1-75. Mondays through Saturdays, and from 9 a.m. This will insure that the threads of the acme nut will be used to support a heavy load. The Harbor Freight Tools store in Norfolk (Store 109) is located at 415 N Military Hwy, Ste 4, Norfolk, VA 23502. Do not extend the acme screw past the maximum adjustment of 6". *Caution, the acme screw of the 6圆 GALVANIZED Screw Jack will completely separate from the acme nut if screwed out too far. Learn More For any difficulty using this site with a screen reader or because of a disability, please contact us at 1-80 or. Do not extend screw past advertised adjustment range. Don't get scammed by emails or websites pretending to be Harbor Freight. Do not exceed recommended allowable safe load ratings in the above chart. Capacities include a standard 2.5/1 safety factor. Load capacity based on actual load test results Douglas Fur #1 6圆 dressed lumber (5.5" square).
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