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Clearance Fit Spec Table
Clearance Fit KS Specifications — 4 sizes
KS B 0401
A clearance fit where a gap always exists between shaft and hole, applied where rotation or sliding motion is needed.
Practical Notes
- Minimum clearance must exceed lubricant film thickness even in clearance fits. Too-small clearance breaks the oil film, causing seizure.
Selection Guide
Always maintains clearance for free rotation or sliding. Common fits: H7/f6 (sliding), H7/g6 (precision running), H11/d11 (loose). Used for bearing outer ring to housing, sliding guides, piston-cylinder. Provides space for lubricant film formation.
KSClearance Fit
4 sizesClearance values are for the φ18–30 nominal size range (ISO 286); other ranges differ.
| Fit | Hole Tol | Shaft Tol | Type | Clearance | Use |
|---|---|---|---|---|---|
| H7/g6 | H7 | g6 | Clearance | 0.007~0.041 | , PrecisionPositioning |
| H7/h6 | H7 | h6 | Clearance | 0.000~0.034 | Positioning, Easy Assembly |
| G7/h6 | G7 | h6 | Clearance | 0.007~0.041 | Sliding Part |
| H7/h6 | H7 | h6 | Clearance | 0.000~0.034 | PrecisionPositioning |
Key Features
- Shaft tolerance zones e–h + hole zones E–H; always guarantees positive clearance
- Representative fits: H7/f6 (sliding), H7/g6 (precision running), H11/d11 (loose running)
- Provides space for lubricant film; allows movement without seizure during thermal expansion
Key Applications
Sliding bearing shafts, hydraulic cylinder pistons, gearbox floating shafts, linear guide rails, pulley bores
FAQ
Difference between H7/g6 and H7/f6?
H7/g6 (precision running) has smaller clearance for precise sliding. H7/f6 (sliding fit) has larger clearance for rotating motion requiring adequate lubrication.