TorqueWise Support

What is TorqueWise?

A bolt torque and preload calculator for iPhone, iPad, and the web. Pick the bolt (size, head, grade, finish, and thread condition), the joint (through bolt or tapped hole, clamped material, grip, washer, and nut), and the preload target and tool. TorqueWise gives the tightening torque, the preload and its expected range, checks of bearing pressure, thread engagement, bolt length, corrosion, and lock nuts, and the tightening sequence for the bolt pattern. A 3D view shows the bolt in a cut-away of the joint. The web app is at torquewise.journeyon.co.

Which standards does TorqueWise follow?

The torque and preload follow VDI 2230 Part 1 (2015). The grades’ strengths come from their material standards, such as ISO 898-1 and SAE J429, and the dimensions of bolts, nuts, washers, and holes from their product standards. The structural targets follow the RCSC Specification and EN 1090-2, and the gasket flange target and the cross-pattern tightening sequence follow ASME PCC-1. Sources and method in TorqueWise lists every source and how each one is used.

How accurate are the results?

The calculation is checked against published values: VDI 2230 Table A1, Fastenal clamp-load tables, RCSC Table 5.2, EN 1090-2 preload values, and ISO 2320. Sources and method runs these 27 checks each time you open it and shows each result. The largest uncertainty in a real joint is friction: the same torque gives a different preload when the friction changes, and friction varies with the finish, the lubricant and how it is applied, the batch, and the tool. TorqueWise shows the expected preload range for the tool you choose. Where preload matters, measure the friction of your parts (ISO 16047) and enter it, or measure the preload directly. The Terms of Use list what the calculation leaves out.

Why does the torque differ from a torque chart?

A chart is worked out for one friction value or nut factor, one preload target, and one kind of head and washer. TorqueWise works the torque out from the finish, the thread condition, the head, the washer, and the preload target you choose. To compare with a chart, set the same thread condition and preload target as the chart, for example Standard at 75 % of proof load.

The manufacturer gives a different torque. Which one do I use?

The manufacturer’s. Where the maker of the equipment, vehicle, or fastener specifies a torque, a tightening procedure, or that a bolt must be replaced, follow their specification. For joints whose failure could hurt someone, the joint and its tightening are a qualified engineer’s decision, under the code or standard that applies (Terms of Use, section 4).

Which units does TorqueWise use?

Metric bolts give the torque in N·m and the preload in kN. Inch bolts give the torque in ft·lb, or in in·lb for small torques, and the preload in lbf. Under the main torque, TorqueWise also shows it in the other system’s unit.

Where are my saved joints stored?

On your device only. In the web app they are stored in your browser, so they are not shared with other browsers or devices. In the iPhone and iPad app they are stored in the app and included in iCloud and computer backups of your device. TorqueWise has no account and does not sync saved joints between devices.

How do I delete my saved joints?

Open Saved, tap Delete next to a joint, then tap Confirm. To delete everything in the web app, clear this website’s data in your browser’s settings. To delete everything in the app, delete the app.

Does TorqueWise work offline?

Yes. The iPhone and iPad app never needs a connection. The web app needs one for your first visit; after that your browser keeps a copy, and it opens without a connection.

Can I add the web app to my Home Screen?

Yes. In Safari on iPhone or iPad, tap the Share button, then Add to Home Screen. In Chrome or Edge on a computer, choose Install in the address bar or in the browser’s menu. The web app then opens in its own window.

Are the app and the web app the same?

Yes. They have the same calculations, options, and screens. The app also keeps a copy of your saved joints in its own preferences, so that they are kept if iOS clears the app’s web storage, and it gives a light vibration when you pick an option.

What does TorqueWise do with my information?

Nothing leaves your device. TorqueWise collects no personal information and has no account, no ads, and no analytics. The Privacy Policy has the details.