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Built for serious engineers.
20,000+ engineers read it, at SpaceX, Viasat, Meta, Yamaha and Tesla. One issue a month, on the details that decide whether a part can be made.
The reference is free, and readers see it first.
The GD&T cheat sheet, the tap and drill chart, the weld symbol chart: every one of them started as a question a reader asked, and every one of them is readable in full on the toolbox, whether you subscribe or not. Subscribers get them first.
Browse the chartsEvery issue explains one thing properly.
Each issue follows one idea the whole way through: what it is, how it gets drawn, and what it costs the person who has to make the part. It skips roundups, news and anything you already know, so you finish it able to do something you could not do before.
Read the explainers
Profile
Feature control frame: profile 0.75.
- Controls
- SizeFormOrientationLocation
- Datum reference
- Optional
- MMC or LMC
- No
Profile in GD&T defines a 3D tolerance zone around a surface, ensuring that every point along the surface conforms to the specified profile tolerance within a given tolerance. Profile can be used with or without a datum reference frame present.
Recommended install torque
523.06in·lb
59.10 N·m · preload 6,974 lb
New tools reach the list before they reach the site.
Calculators and Redliner changes go out to the list first, with the note explaining what the thing is for and where its numbers come from. The one running here is bolt torque, on the same formulas the real calculator uses.
Open the toolboxRead before you subscribe