When a trim panel clip mount calls for a specific metric hex head sems — M4.2 with a 12mm washer for one application, 20mm for another — grabbing the wrong washer diameter is how a panel ends up loose or cracked at the clip housing. This 165-piece assortment covers the most common OEM-spec metric trim screws for GM and Ford applications, pre-sorted in a 6-hole labeled small plastic drawer.

What's Included

M4.2-1.41 x 20 hex head sems, 12mm washer O.D. — 30 pieces (GM style)
M4.2-1.41 x 20 hex head sems, 16mm washer O.D. — 30 pieces (GM style)
M4.2-1.41 x 20 hex head sems, 12mm washer O.D., tek point — 30 pieces
M4.2-1 x 20 hex head sems, 20mm washer O.D. — 30 pieces (GM style)
M4.2-1.41 x 20 hex head sems, 17mm washer O.D., tek point — 30 pieces
M6.3-1.81 x 16 hex head sems, 16mm washer O.D. — 15 pieces (Ford style)
6-hole small plastic drawer — pre-sorted and labeled by size
165 pieces total

Specifications

Screw type	Hex head sems (captive washer) — OEM metric trim style
Primary size	M4.2 x 20 in multiple washer O.D. configurations
Additional size	M6.3 x 16 (Ford flange style)
Washer O.D. range	12mm, 16mm, 17mm, 20mm
Drive	Hex head
Total pieces	165
Storage included	Yes — 6-hole small plastic drawer
SKU	ASST6TRIMSCR

Best For

Auto body shops — OEM-spec metric trim screws for door panels, dash trim, quarter panels, and interior clip mounts on GM and Ford platforms
Fleet maintenance technicians — interior and exterior trim repair on commercial vehicles where metric hex sems are the OEM fastener
Detailers and trim specialists — panel removal and reinstallation requiring specific washer diameters to avoid cracking or deforming plastic clip housings
Independent repair shops — keeping a complete range of metric trim screws on hand without sourcing individual OEM part numbers for every job

About These Trim Screws

Metric hex head sems screws are captive-washer fasteners — the washer is captured under the head and spins freely. This design lets the washer seat flat against a mounting surface as the screw is driven, spreading the clamping load without marring or cracking plastic trim components.

The washer outer diameter is the critical dimension for automotive trim applications. OEM specifications call out specific O.D. values — a 12mm washer where a clip mount calls for 20mm lets the panel shift; a 20mm washer in a tight recess may not seat at all. This assortment covers the most common O.D. configurations for GM and Ford platforms in a single organized drawer, so the right size is always at hand before the panel goes back on.

The tek point variants in this kit feature a self-drilling tip for applications where the screw needs to pierce a mounting tab or thin bracket directly, without a pre-drilled pilot hole.

Shipping & Ordering

Ships within 1–2 business days from our warehouse
Volume pricing available — save up to 20% when ordering 3 or more kits
B2B accounts: Auto body shops, fleet facilities, and dealership service departments can apply for a business account with custom pricing and a dedicated rep — contact us to get started

Screw Assortments

165 Piece Trim Screw Assortment Starter Kit