Sheet Metal Screw — Type AB Pan & Hex Washer
Sheet metal screws are a workhorse for thin-gauge sheet steel and aluminum. Type AB point (sharp gimlet with machine-thread profile) is now standard, having replaced the older Type A. Pan head with Phillips drive for general use; hex washer head when over-driving must be avoided.
Specifications
| Point | Type AB (most common modern), Type A (older), Type B (blunt point, thicker sheet) |
|---|---|
| Head | Pan, Hex washer, Round, Truss, Wafer |
| Diameter | #4 – #14 (M3 – M6.3) |
| Surface Finish | Zinc plated, Yellow zinc, Stainless |
Frequently Asked Questions
Sheet metal screw vs self-drilling screw — when to use which?
Sheet metal screws need a pre-drilled hole; self-drilling screws drill their own hole. For thin sheet (under ~1.6 mm) and aluminum, both work but sheet metal screws are cheaper. For thicker steel, self-drilling screws save the pre-drill step. For volume production, self-drilling typically wins on total assembly time.
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