Torsion Spring

indicative

Design standard

Calculation standard

Sets screening knobs for Indicative practice — not product type or catalog geometry

Standard SF / service factors for compression, extension, or torsion springs. Spring type stays free.

Target SF 1.50Service factor 1.10

Reference standards

Machinery's HandbookWahl / Spring Design Manual

Validate — verify what you entered

Auto-design runs a solver-backed sizing search, applies the best candidate, then runs the full validation check.

Torsion spring

Helical torsion spring — bending rate k = Ed⁴/(64·D·n), curvature-corrected coil stress.

Wire diameter (d)

Mean coil diameter (D)

Leg length

Deflection angle (deg)

Active coils (n)

Elastic modulus E

Wire grade (EN 10270 / ASTM)

Wire stock (EN 10270 / ASTM catalog)

EN 13906 fatigue screening

Continue workflow

Typical next steps after Torsion Springs

Design help & referenceShow

Reference documentation

Standards, catalogs, and technical write-ups relevant to this module.

Candidate strategy

Typical Auto-design directions for torsion springs.

Option	Basis	Pass	Tradeoff
Compact spring	Small envelope	Check stress	Higher stress
Balanced spring	Target rate	Pass expected	Moderate envelope
Long-life spring	Lower stress	High fatigue margin	Larger size