Abstract: A surface marked threaded fastener comprising an elongated and threaded shaft and a head at one end of the elongated and threaded shaft; said head comprising on a surface contacting face a readable matrix comprising a dot pattern, said dot pattern defining a tightening specification.

Abstract: A surface marked threaded fastener comprising an elongated and threaded shaft and a head at one end of the elongated and threaded shaft; said head comprising on a surface contacting face a readable matrix comprising a dot pattern, said dot pattern defining a tightening specification.

Abstract: A surface marked threaded fastener comprising an elongated and threaded shaft and a head at one end of the elongated and threaded shaft; said head comprising on a surface contacting face a readable matrix comprising a dot pattern, said dot pattern defining a tightening specification.

Abstract: A sensor device for detecting static modulus of elasticity in situ comprising: top and bottom frame end plates, said top and bottom frame end plates connected by at least two frame side bars; a dry cavity connected to said top frame end plate comprising a piston, precompression mechanism, and piston transfer plate; a displacement measurement gauge extending from said dry cavity along a longitudinal axis of said sensor device having a first end in contact with said piston transfer plate and a second end in contact with a bottom inner face of said bottom frame end plate; and a top inner face connected to said piston transfer plate, wherein a portion of elastomeric material is positioned on said bottom and top inner faces, said elastomeric material positioned to prevent contact with either bottom or top inner faces except for a portion along the longitudinal axis of the displacement measurement gauge.