Type I cross recessed flat countersunk trim head tapping screws with Type AB thread forming are a widely specified fastener combining a shallow, smaller‑diameter countersunk head with the industry’s most commonly used thread‑forming point design. The trim head profile sits nearly flush with the workpiece surface but uses a smaller head diameter and lower head height than a standard flat countersunk head, making it the fastener of choice when clearance is tight or a lower‑profile appearance is required — typically in hinges, drawer slides, strike plates, latches, and thin‑gauge hardware assemblies.
The Type AB thread form, defined in ASME B18.6.4‑1998 (R2005), combines the sharp gimlet point of Type A with the finer thread pitch of Type B. This gives the screw excellent starting and driving characteristics in thin sheet metal, plastics, plywood, and fiberglass, while providing higher stripping resistance than the older Type A design. The cross recess drive (Type I recess) centers the driver bit and accommodates both manual and power installation.
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