6. Size: #4-40 X 1-1/4 inchFlat head, Phillips driveUse with nuts or pre-threaded holes of the same diameter & thread sizeOften used in machinery & appliancesNuts and washers not includedThread Type: Coarse, Thread Class: UNC-2A, Point Style: BluntSpecification(s) Met: ASME B18.Machine Screw, Flat Head, Phillip Drive #4-40 X 1-1/4in Zinc Plated Steel 100PK They are frequently used in machinery and appliances.3 & SAE J82.