Parameters
Advanced head styles · Pro — see plans
Specialty drives · Pro — see plans
Long threaded taper with a cutting edge — fast start in thin sheet and wood without a separate drill section.
Type
Countersunk Screw
Designation
ST5.5 × 1.8 – 50
Head
Countersunk · Ø11 × 3.16 mm · 82° included
Countersink
82° included cone (ISO 10642) — head height 3.16 mm follows from head Ø and angle
Drive
Torx · 5 mm key
Recess depth
1.58 mm · auto · gauge limits t 1.26–1.9 mm · ISO 10664
Thread
32.00/50 mm · P1.8 · ST sheet-metal (ISO 1478) · plain shoulder 18.0 mm
Major Ø (as built)
5.30 mm
Point
Fast Point (JF) · 9.35 mm
Service class
C3 · Outdoor urban · coating under-rated — use dip-spin ceramic coating
Est. install torque
≈ 3.9 N·m (indicative — verify by test)
Est. pull-out
≈ 3.6 kN from 2 mm steel sheet (indicative)
Manufacturing mode
FDM 3D print · +0.2 mm thread offset
Notes
ITB-KOT-2020/1057 · Carbon steel · T25 drive.
Export & Download
manufacturing simCNC mode, .STEP export & PDF datasheets are Pro features — see plans