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In aerospace fastener industry, all materials used or being considered for fastener applications must meet specified minimum shear strength values tested via single-shear test and double-shear test. However, shear testing results are not as precise as tension and compression testing due to the introduction of friction and bending forces in the testing process, resulting in the difficulty in obtaining accurate test data. Previous study showed the various effects of coating tribology on fastener single and double shear strength. Experimental results, statistical analysis and finite element analysis all confirmed that surface tribology could significantly affect the shear strength test results. Comparing to un-coated or bare fasteners, confirmed that fasteners from the same lot exhibited significantly lower shear strength values after coating. This effect is well known in the Aerospace fastener industry.