Machine Screws American Standard   Slotted Flat Countersunk Head IFI F-8 Cross Recess of Flat Countersunk Head IFI F-9   Slotted Flat Countersunk Head IFI F-18 Cross Recess of Oval Countersunk Head Screws IFI F-19   Slotted Flat Pan Head IFI F-24   Cross Recess of Pan Head IFI F-25 Slotted Fillister Head IFI F-26 Cross Recess of Fillister Head IFI F-27 Slotted Truss Head IFI F-28 Cross Recess of Truss Head IFI F-29 Slotted Binding Head IFI F-30 Cross Recess of Binding Head IFI F-31