The heart of a tie-down and tow strap is its webbing and the webbing design must be specific to the job. The webbing used to lash a kayak to an automobile roof rack requires a different rated capacity, abrasion resistance and weave pattern than a heavy duty motorcycle/ATV tie-down. Likewise, a 10,000 lb. industrial ratchet tie-down has different requirements as well. Keeper’s commitment to providing only high quality, long lasting, value driven products requires that it design specific webbing to meet the demands for specific applications.
Keeper developed its HI-TEST webbing many years ago using 3 layers of high tenacity yarn to protect and provide strength. The face, back and edge layers provide the webbing with abrasion and weather protection and the center, or warp yarns, provide the strength. All HI-TEST webbing is tested for abrasion resistance using Federal Test Method #5309, required of all mil-spec webbing. The webbing is cycled over a steel hexagonal bar to simulate real life application. A tensile test is then conducted. All Keeper webbing passes an abrasion capacity requirement to ensure a long lasting product.
The strength of each component of an assembly. For example: A ratchet handle begins to fail at 13.00 lbs., the hook begins to fail at 10,000 lbs. and the webbing breaks in excess of 12,000 lbs.
Also known as "assembly capacity" or "break strength." This is the maximum load a complete assembly can withstand before failure in a laboratory pull test when the product is new.
The maximum weight of a load a tie-down should be subject to during normal use. To assist in making the proper tie-down for the job, Keeper, the Web Sling Association and the Federal D.O.T. required the working load limit to be 1/3 of the rated capacity.