With one flexural stress lap length, it should be equal to the construction length of the rcc structure or 30d, whichever is greater. In general, the lap length should be calculated as 41d, where d is the diameter of the rebar. For direct stress, the lap length should be twice the production length (2Ld or 30d).Metal Column Covers. PAC-CLAD’s line of round and square metal column covers offers architects superior design flexibility for structural beam applications, both interior and exterior. Utiliziuding aluminum in an unmatched range of standard and custom colors, anodized aluminum, aluminumposite, stainless Production Lapping. is a full service lapping and contract manufacturer, specializing in flat lapping, flat honing, CNC milling & turning and assembly. Production Lapping has been in the precision machining business for as long as we have b 1961. We currently manufacture and lap parts for the aerospace, medical ...The lap-shear test is illustrated in Fig. 3.13. It was originally made from two pie in width, bonded toge. These dimensions have now (in Europe) been replaced by the metric equivalents shown in the figure. This testpiece is loaded to failure in a normal tensile testing machine.