The threads on sheet metal screws are designed to pull two materials tightly together.
3 & SAE J933.6.Sheet Metal Screw, S-Tap Pan Head Phil Dr #8 X 1-1/2in Zinc Pl Steel Black Head 25PK When attaching metal to wood, it is especially important to pre-drill a hole.Size: #8 X 1-1/2 inchPan Head, Phillips DriveUsed to attach sheet metal to other thin metal, wood or other materialSharp pointed tipPilot hole should be pre-drilledThread Type: Type A, Point Style: SharpSpecification(s) Met: ASME B18.