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ISO SYMBOL |
DESCRIPTION |
APPLICATIONS |
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Hole
Basis |
Shaft Basis |
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| Parts can move relative to each other |
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| Clearance fits |
H11/c11 |
C11/h11 |
Loose running fit for wide commercial tolerances or allowances on
external members. |
Pivots, latches, fits of parts exposed to corrosive effects,
contamination with dust and thermal or mechanical deformations. |
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| H9/d9 |
D9/h9 |
Free running fit not for use where accuracy is essential, but good for
large temperature variations, high running speeds, or heavy journal
pressures. |
Multiple fits of shafts of production and piston machines, parts
rotating very rarely or only swinging. |
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| H8/f7 |
F8/h7 |
Close running fit for running on accurate machines and for accurate
moderate speeds and journal pressures. |
Main fits of machine tools. General fits of shafts, regulator
bearings, machine tool spindles, sliding rods. |
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| H7/g6 |
G7/h6 |
Sliding fit
not intended to run freely, but to move and turn freely and locate
accurately. |
Sliding gears and clutch disks, parts of machine tools, pistons
of hydraulic machines, rods sliding in bearings, grinding machine spindles,
crankshaft journals. |
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| H7/h6 |
H7/h6 |
Locational clearance fit provides snug fit for locating stationary parts; but
can be freely assembled and disassembled. |
Roller guides, precise guiding of machines and
preparations, exchangeable wheels. |
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| Parts cannot move relative to each other |
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| Transition fits |
H7/k6 |
K7/h6 |
Locational transition fit
for accurate location, a compromise between clearance and interference. |
Clutches,
demountable fits of hubs of gears and pulleys, manual wheels, brake
disks. |
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| H7/n6 |
N7/h6 |
Locational transition fit for more accurate location where greater interference
is permissible. |
Armatures of electric motors on shafts, gear rims, fixed plugs,
driven bushings, flushed bolts. |
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| Interference fits |
H7/p6 |
P7/h6 |
Locational interference fit for parts requiring rigidity and alignment with prime
accuracy of location but without special bore pressure requirements. |
Bearing bushings, Hubs of clutch disks. |
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| H7/s6 |
S7/h6 |
Medium drive fit for ordinary steel parts or shrink fits on light
sections, the tightest fit usable with cast iron. |
Permanent coupling of gears with shafts, bearing bushings. |
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| H7/u6 |
U7/h6 |
Force fit
suitable for parts which can be highly stressed or for shrink fits where the
heavy pressing forces required are impractical. |
Permanent couplings of gears with shafts, flanges. |
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http://www.teleingeniero.com/?p=158 |
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