ST1.9 self-tapping screws

sheet-metal (ISO 1478)

3 documented uses, taken from manufacturer catalogs, service manuals and teardowns.

Pilot hole

1.5-1.6 mm in 0.5-1.0 mm steel

Too tight and the head snaps or the boss splits; too loose and the thread strips on the first removal.

Affiliate links — they cost you nothing extra and keep this database free.

Extremely fragile; prone to head snap if over-torqued in steel.
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.

Xiaomi Redmi Note 14 Pro

Internal shield and PCB fastening

3-5 mm · confirmed · electronics

Tabco Optical Frames

Lens and temple securing

9.6 mm · confirmed · optical

Smartphone Camera Module

Securing lens housing to sensor bracket

2.5 mm · high · electronics