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<br /> <br /> <br /> <br /> <br />HILTI TECHNICAL BULLETIN <br /> <br />December 4, 2014 <br /> <br />Subject: Hilti KWIK HUS-EZ calculated yield stress and minor diameter <br /> <br />The following table 1 shows the calculated yield stress and minor diameter of the Hilti <br />KWIK HUS-EZ (KH-EZ) screw anchor. <br /> <br />Table 1 – Hilti KWIK HUS-EZ yield stress and minor diameter <br />KH-EZ nominal <br />diameter <br />Length Minimum yield <br />stress 1 <br />Minimum minor <br />diameter <br />in. psi (MPa) in. (mm) <br />1/4 all 95,700 0.240 <br />(660) (6.1) <br />3/8 1-7/8 to 2-1/8 56,550 0.327 <br />(390) (8.3) <br />3/8 3 to 5 95,700 0.327 <br />(660) (8.3) <br />1/2 all 88,450 0.449 <br />(610) (11.4) <br />5/8 all 63,075 0.581 <br />(435) (14.75) <br />3/4 all 50,025 0.703 <br />(345) (17.85) <br />1 Minimum yield stress calculated in accordance with ISO 898-1 using the lesser of the tensile <br />strength of the steel prior to manufacturing process or core hardness after production. <br /> <br />When calculating the bending moment of the KH-EZ for stand-off conditions (i.e. when <br />steel fixture is not directly bearing on concrete or grout-filled CMU surface) it is <br />suggested to refer to section 3.1.6.9 of the 2014 Hilti North America Product Technical <br />Guide, Volume 2: Anchor Fastening Technology Guide. Section 3.1.6.9 describes a <br />suggested calculation for bolt bending based on tests for post-installed fasteners <br />embedded in concrete and takes into account factors such as localized crushing of the <br />base material and rotational restraints. Other methods, such as using the above yield <br />stress and minor diameter, could be un-conservative since it does not take into account <br />these factors. <br /> <br />Please feel free to contact our Engineering Technical Services department for more <br />information or any questions. <br /> <br />Hilti Engineering Technical Services <br /> <br />United States Canada <br />(877) 749-6337 toll free (800) 363-4458 toll free <br />(918) 872-6337 CATechnicalServices@hilti.com <br />hnatechnicalservices@hilti.com <br />