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Sizing calculator

Pick diameter and material; hole size, torque, engagement and warnings update in seconds.

Selected combination

ST 3.5 × 25

DIN 7981 · 1,5 mm sac

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Cross-section view

Dimensions update live as you change inputs

Outputs

What this tool provides

Two calculation modes; each returns 6 technical values, status messages and a drawing.

Sheet metal screw (ST)

  • Pilot hole diameter (mm)
  • Thread pitch
  • Head diameter
  • Max. sheet thickness
  • Engagement depth
  • Min. screw length

ST 2.9 — 6.3

Metric bolt (M)

  • Hole diameter Ø (mm)
  • Thread pitch
  • Allen key size (s)
  • Recommended torque (N·m)
  • Engagement depth
  • Min. bolt length

M3 — M12

Shared

  • Warning boxes
  • Live SVG cross-section
  • Automatic calculation
  • No server required
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