The threads on sheet metal screws are designed to pull 2 materials tightly together. When attaching metal to wood, it is especially important to pre-drill a hole. Use a smaller drill size than screw when pre-drilling a hole.
- Size: 5/16 in.-18 x 1-1/2 in.
- Flat head, Phillips drive
- Use with nuts or pre-threaded holes of the same diameter and thread size
- Often used in machinery and appliances
- Nuts and washers not included
- Thread type: coarse, thread class: UNC-2A, point style: blunt
- Specification(s) met: ASME B18.6.3 and SAE J82












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