Boltspan: Joint Design

About Boltspan: Joint Design

Boltspan: Joint Design is a focused, fully on-device app. A transparent bolted-joint calculator for preload scatter, torque, joint stiffness, load fraction, separation, proof margin, fatigue, and tightening sequences.

KEY FEATURES
- Metric thread stress-area library
- Torque-preload scatter envelope
- Bolt/joint stiffness model
- Separation and proof margins
- Sequence and inspection worksheet
- Editable complete sample and local project persistence
- CSV input plus local PDF and data export
- Fifty-two original offline reference plates

ONE-TIME AND PRIVATE
- One paid download; no subscription or in-app purchase
- No account, advertising, analytics, tracking, or developer-operated backend
- Core features and bundled content work offline
- Work remains on device unless you deliberately share or export it through an Apple system interface

Engineering screening only. Confirm material, lubrication, thread engagement, embedment, temperature and governing code.