Simpson Strong-Tie 0.315" x 5-1/2" SDCF Timber-CF Flat Head Screw - E-Coat, Black, Qty. 50The Simpson Strong Tie SDCF8X140 R50 SDCF TIMBER CF screw by Simpson Strong Tie is built to meet the structural demands of mass timber construction, including cross laminated timber (CLT), glulam, and laminated veneer lumber (LVL). This fully threaded structural screw provides high strength connections for demanding wood to wood applications, no pre drilling required in most conditions. Key Features: Fully Threaded Design: Ensures even load