ST4.8 self-tapping screws
sheet-metal (ISO 1478)
5 documented uses, taken from manufacturer catalogs, service manuals and teardowns.
Pilot hole
4.1-4.4 mm in 1.0-2.5 mm steel
Too tight and the head snaps or the boss splits; too loose and the thread strips on the first removal.
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Watch out for
- Drill point length must exceed total material thickness to prevent 'jacking'.
- Most TV, appliance, HVAC and power-tool service documents list only a driver type or a part number, never a thread size - so a screw kit sold as 'fits brand X' is usually a seller's guess, not an OEM spec. Measure the old screw before buying.
Where ST4.8 is used
Lindab Rainline Gutter System
Securing gutter brackets to fascia boards
35-38 mm · confirmed · gutters
View sourceEJOT DABO Roof Screw
Fixing roofing membranes to steel substructures
60-120 mm · confirmed · metal brackets
View sourceESSVE Sheet Metal Screw
Mounting sheet metal indoors and light structural work
38 mm · confirmed · metal brackets
View sourceStorage Shed (SS16326GR)
Wall panel and roof panel assembly
16-25 mm · confirmed · cabinets
View sourceFord F-150 Assist Handle
Securing A-pillar assist handle to chassis
30 mm · confirmed · car interior trim
View source