Generic 7 mm Trim Screws for GM - 25-Pack Black Phosphate, OEM-Fit for Interior & Exterior

These are factory-equivalent 7 mm indented-hex trim screws (thread #8 / M4.2-1.41), sold in a set of 25, designed to replace GM Part# 11503396 for interior and exterior trim, splash shields, and engine bay fastenings.

When you need reliable, exact-fit fasteners for GM vehicles, using the same screws the factory installs prevents fitment issues, stripped heads, and corrosion problems later. This kit contains 25 black phosphate finish screws with a 7 mm indented-hex head and a loose washer (12 mm OD), matching original equipment specifications for many Chevrolet, Buick, Oldsmobile, Pontiac, Cadillac and GMC Truck body styles.

Will these screws fit my GM part or panel?

These screws are a direct replacement for GM Part# 11503396 and match the factory thread, length, and head geometry used across numerous GM panels. If your original fastener uses a 7 mm indented-hex head and a #8 thread, this set will be compatible.

• Thread spec: #8 (M4.2-1.41) — matches OEM threading.
• Length: 3/4" (19 mm) — typical for trim and splash shield attachment.
• Head: 7 mm indented hex with 12 mm outside diameter loose washer — identical seating.
• Finish: black phosphate — same look and corrosion resistance as factory parts.

How are these screws different from generic hardware-store fasteners?

Generic screws often vary in thread pitch, head diameter, or washer fit and can lead to loose panels or damaged clips. These screws are manufactured to match the OEM tolerances used on the assembly line so they fasten precisely and hold as intended.

• OEM-matched thread pitch prevents cross-threading and strip-out.
• Proper head geometry ensures correct engagement with factory tools.
• Loose washer dimension matches original sealing and load distribution.
• Black phosphate finish gives consistent appearance and corrosion resistance.

Where on the vehicle are these typically used?

These screws secure a variety of trim and protective parts both inside and outside the car. Common uses include splash shields, inner fender liners, engine bay trim, bumper covers, and interior panels where a compact indented-hex head is required.

• Splash shields and wheel well liners — resists road debris and moisture exposure.
• Engine bay trim and brackets — holds components under heat and vibration.
• Bumper and exterior/underbody panels — low-profile finish for clean appearance.
• Interior trim attachments where OEM fasteners are specified.

How should I install and torque these screws for best results?

Use a matching 7 mm hex driver designed for indented or recessed heads to avoid cam-out. Tighten until snug and do not over-torque; these are sheet-metal fasteners intended to clamp trim, not as structural bolts.

• Driver: 7 mm indented-hex socket or bit for correct engagement.
• Tightening: hand or low-torque driver; stop when trim seats firmly.
• Replacement: use OEM-matched screw for any removed fasteners to retain factory fit.
• Storage: keep dry and sealed to preserve black phosphate finish.

Who is this for? Professional technicians restoring GM vehicles, DIY mechanics replacing worn or missing trim hardware, and restoration projects seeking exact-fit, assembly-line equivalent fasteners will benefit from this set. If you need reliable replacements that match GM Part# 11503396 in thread, length, head style, and finish, this 25-piece kit supplies the correct screws for interior and exterior trim, splash shields, engine bay fittings, and other commonly fastened panels.