Shafts, Keys & RetentionHow torque gets into a shaft, and what actually limits the diameter.Mechanical EngineeringChoose the torque path first, then check what limits the section.Getting torque in and outParallel key in a keyway, the defaultSplines for high torque or slidingInterference fit, no stress raiserTaper lock bush, easy to removeShear pin: cheap, deliberate fuseWhat limits the shaftTorsional shear at the smallest diameterBending fatigue at every shoulderDeflection at the gear or pulleyCritical speed near running speedA keyway cuts strength by about a quarterGenerous fillet radii at shoulders buy more fatigue life than a strongersteel does, and cost nothing.Shafts, Keys & Retentionlearnposters.com
Shafts, Keys & Retention — printable engineering wall chart from LearnPosters. Free vector PDF, US Letter and A4.

What’s on the Shafts, Keys & Retention poster

10 entries in 2 groups.

Choose the torque path first, then check what limits the section.

Generous fillet radii at shoulders buy more fatigue life than a stronger steel does, and cost nothing.

Questions about the Shafts, Keys & Retention poster

What’s on the Shafts, Keys & Retention poster?
10 entries in 2 groups. Choose the torque path first, then check what limits the section. Getting torque in and out: Parallel key in a keyway, the default, Splines for high to…; What limits the shaft: Torsional shear at the smallest diameter, Bending fatigue at e…. Generous fillet radii at shoulders buy more fatigue life than a stronger steel does, and cost nothing.
Who is the Shafts, Keys & Retention poster for?
Shafts, Keys & Retention belongs to the Mechanical Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning machine design can pin it up — a beginner, a student mid-course, or someone revising years later.
When should you use the Shafts, Keys & Retention poster?
Detailing a shaft: keyways, shoulders, fillets and how the hub is held on. A wall chart earns its place by being glanceable from where the work is happening, so Shafts, Keys & Retention belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
What other posters go with Shafts, Keys & Retention?
ISO Fits, Bearing Life and Choosing a Bearing sit alongside Shafts, Keys & Retention in the Mechanical Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.ISO FitsBearing LifeChoosing a Bearing
Is the Shafts, Keys & Retention poster free to download and print?
Yes. Shafts, Keys & Retention downloads as a free PDF with no account, no email and no watermark, like everything else in the Mechanical Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
What size does the Shafts, Keys & Retention poster print at?
Shafts, Keys & Retention is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Shafts, Keys & Retention loses nothing.Printing guide

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