What’s on the ISO Fits poster
A 6-row table: Fit · Example · Behaviour.
Hole basis: the hole is H, and the shaft letter sets the fit.
- Loose running — H9/d9 — Wide clearance, dirt tolerant
- Close running — H8/f7 — Oil film, general bearings
- Sliding — H7/g6 — Slides freely, still locates
- Locational — H7/h6 — Assembles by hand
- Transition — H7/k6 — Light tap, accurate location
- Interference — H7/p6 or s6 — Needs press force or heat
A smaller IT grade number means a tighter tolerance and a higher cost. Hole basis is the usual default.
Questions about the ISO Fits poster
- What’s on the ISO Fits poster?
- A 6-row table: Fit · Example · Behaviour. Hole basis: the hole is H, and the shaft letter sets the fit. Loose running — H9/d9 — Wide clearance, dirt tolerant; Close running — H8/f7 — Oil film, general bearings; Sliding — H7/g6 — Slides freely, still locates; Locational — H7/h6 — Assembles by hand; Transition — H7/k6 — Light tap, accurate location; Interference — H7/p6 or s6 — Needs press force or heat. A smaller IT grade number means a tighter tolerance and a higher cost. Hole basis is the usual default.
- Who is the ISO Fits poster for?
- ISO Fits 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 ISO Fits poster?
- Detailing a shaft and hole pair: bearing seats, dowels, bushes, pins. A wall chart earns its place by being glanceable from where the work is happening, so ISO Fits belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
- What other posters go with ISO Fits?
- Shafts, Keys & Retention, Bearing Life and Choosing a Bearing sit alongside ISO Fits 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.Shafts, Keys & RetentionBearing LifeChoosing a Bearing
- Is the ISO Fits poster free to download and print?
- Yes. ISO Fits 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 ISO Fits poster print at?
- ISO Fits 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 ISO Fits loses nothing.Printing guide
Related posters
Charts that sit alongside ISO Fits on the same wall.
Browse every Mechanical Engineering poster, or start from the full catalogue.