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Short answer
For a slip fit, draw both parts at the same nominal size and call out the ISO 286 H7/g6 fit on your drawing: H7 for the hole and g6 for the shaft. That way the parts slide and turn freely without losing their location.
PREMSA Industries team
3 min read
Updated: October 1, 2026
Category: Tolerances & quality
For a slip fit, draw both parts at the same nominal size and call out the ISO 286 H7/g6 fit on your drawing: H7 for the hole and g6 for the shaft. That way the parts slide and turn freely without losing their location.
Example for a 10 mm nominal diameter:
| Fit | Use | Hole | Shaft | Clearance |
|---|---|---|---|---|
| H7/h6 | Locational: snug, easy to assemble and disassemble | 10.000 to 10.015 mm | 9.991 to 10.000 mm | 0 to 0.024 mm |
| H7/g6 | Sliding: moves and turns with precise location | 10.000 to 10.015 mm | 9.986 to 9.995 mm | 0.005 to 0.029 mm |
| H8/f7 | Precise running at moderate speed and pressure | 10.000 to 10.022 mm | 9.972 to 9.987 mm | 0.013 to 0.050 mm |
| H9/d9 | Free running, tolerates temperature changes and high speed | 10.000 to 10.036 mm | 9.924 to 9.960 mm | 0.040 to 0.112 mm |
| H11/c11 | Loose clearance for external parts | 10.000 to 10.090 mm | 9.830 to 9.920 mm | 0.080 to 0.260 mm |
Limits change with diameter. For your size, use our Fit Clearance Calculator or the Fit Tolerance Chart.
If your part mates with an off-the-shelf part, such as a bearing, pin or bushing, call out on your drawing the fit recommended by that part’s manufacturer.
ISO fits apply to CNC machining. In 3D printing the clearance is drawn in your model: leave this gap between the two parts, per side:
| Fit | Use | Clearance per side |
|---|---|---|
| Snug | Tight lids, alignment pins | 0.10 to 0.20 mm |
| Sliding | Lids, drawers, telescoping parts | 0.20 to 0.30 mm |
| Loose | Hinges, rotating parts | 0.40 to 0.50 mm |
A press fit is not reliable in 3D printing: layers and dimensional variation make the interference hard to predict. To secure a pin or bearing, use inserts or bond the part. If you need a precise fit, it’s better to machine your part.
Note the fit you need in your part’s notes, or email us at ventas@premsaindustries.com and we’ll help you define it before manufacturing.
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