1.1 This specification covers the requirements for quenched and tempered alloy steel socket-set screws (SSS) 0.060 through 2.000-in. sizes having hardnesses 45 to 53 HRC.1.2 These set screws are intended for compression applications only and are This specification covers the requirements for quenched and tempered alloy steel socket-set screws (SSS). The screws shall be fabricated from alloy steel made to fine grain practice. The screws may be forged, formed, extruded, machined, or ground to me