Boltspan: Joint Design
Preload, torque and fatigue
$3.99 · Designed for iPad. Not verified for macOS.
A transparent bolted-joint calculator for preload scatter, torque, joint stiffness, load fraction, separation, proof margin, fatigue, and tightening sequences.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Robert Corbin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Robert Corbin
- Size
- 219.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Age Rating
4+
- 4+
- Copyright
- © 2026 Robert Corbin
