This key has a ball at one end that allows angular tightening. Use this key for 1/4-20 Socket Head and 5/16-18 Button Head Screws. This is also the key you will need for the EF-015 – 15 Series End Fasteners. (product image is inacurate)
AA 6063-T6 is an aluminium alloy, with magnesium and silicon as the alloying elements. The standard controlling its composition is maintained by The Aluminum Association. It has generally good mechanical properties and is heat treatable and weldable. It is NOT recommended to weld anodized aluminum.
Tensile strength (σt): 30,000 psi
Density (ρ): 0.10 lbs/in3
Melting temperature (Tm): 615 °C (1,139 °F)
Thermal conductivity (k): 201-218 W/m*K
Linear thermal expansion coefficient (α): 2.34*10−5 K−1