Workshop · ISO 286

Limits & Fits

Hole and shaft limits to 0.001 mm. Preferred hole-basis fits, zone diagram, shop card.

Basic size

Ømm

Band 30–50 mm

System

Hole H7

Shaft g6

Ø50 H7/g6

Clearance fit

Min clearance
+9.0 µm
Max clearance
+50 µm
Hole process
Grind, ream, or fine turn
Shaft process
Fine grind

Hole H7

50.025 / 50.000mm

+25 / 0 µm

GO 50.000 · NO-GO 50.025

Shaft g6

49.991 / 49.975mm

-9 / -25 µm

GO 49.991 · NO-GO 49.975

Tolerance zone

Clearance

0Hole H7+25 / 0Shaft g6-9 / -25

End view

Zones exaggerated

Hole H7max 50.025min 50.000Shaft g6max 49.991min 49.975

Clearance · millimetres at 20 °C.

Assembles by hand. Shaft always smaller than the hole.