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Screw Sizes Screw sizes are designated by a number that indicates the diameter and the length of the screw in inches (Table 10-2). The smallest diameter screw is 0, and the largest commonly available is 24. For bench work, the most useful sizes are 4 through 12. Of those sizes, 6, 8, and 10 are probably used more than any others. Head TypesSteel Sheet Metal Screw, Zinc Plated, Hex Washer Head, Slotted Drive, Type AB, 6-20 Thread Size, 3/8" Length. 5.01 5.01 - 119.95 119.95. FREE Shipping on eligible orders. Some colors are Prime eligible. 3.5 out of 5 stars 16. 1/4''-14 x 1'' Hex Washer Head Self-Drilling Tek Screw Zinc Plated Steel for Attaches Sheet Metal .