Hole Shaft Tolerances Online Calculator HOLE Tolerance

SHAFT Tolerance

Easy PDF Chart from 7-24mm for hole and shaft base :

•  Look at the tolerance type chart above and pick a tolerance, let say we pick Close Clearance and the drill bit is 20mm
•  Now we know we must use the H8/f7 (hole / shaft)
•   Input H8,20mm into the "Hole Tolerance" calc and we see we must drill a hole between 20.000-20.0330 to be in tolerance of Close Clearance
• Now go to to the SHAFT Tolerance calc and input f7 ,20mm and we see the shaft must lie between 19.9590-19.9800 to stay in tolerance of Close Clearance
• ALTERNATIVELY we may have chosen the shaft to be the nominal diam of 20mm (say we have a 20mm rod as our basis and need to know what size hole we should be aiming for wheras before we started with a 20mm hole and wanted to know what rod size to insert into it). This would mean we must use F8/h7, which would have resulted in HOLE: 20.0200-20.0530 SHAFT: 19.9870-20.0000

Free Running       

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This type of tolerance can be usable where any special requirements for accuracy in not essential, but good for wide temperature variation, heavy journal pressures and high running speeds. Some of the applications: Multiple fits of shafts of production and piston machines, parts rotating very rarely or only swinging.. Some of the selected Preferred fits: H9/d9, D9/h9, H9/C9, H9/d10, D9/h8, H8/d9, H8/d8, D10/h9, Loose Running       

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Fits For wide commercial tolerances/clearances or allowances with parts on external members. Some of the applications: Fits of parts exposed to corrosive effects, pivots, latches, contamination with dust and thermal or mechanical deformations. Some of the selected Preferred fits: H11/c11, H11/a11, C11/h11, H11/c9, D11/h11, H11/d11, A11/h11, Easy Running       

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This is tuning fits with smaller clearances with general requirements for fit accuracy. Some of the applications: Main fits of machine tools. General fits of shafts, regulator bearings, machine tool spindles, sliding rods. Some of the selected Preferred fits: H8/f8, H9/f8, F8/h6, F8/h7, H8/f7, H7/f7, Sliding/Running Fit      

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This fit does not provide freely running. This running/sliding tolerance fits with very small clearances for accurate guiding of shafts. This kind of tolerance helps the parts to move and turn freely and locate accurately. Some of the applications: sliding gears and clutch disks, parts of machine tools, pistons of hydraulic machines, rods sliding in bearings, grinding machine spindles, crankshaft journals. Some of the selected Preferred fits: H7/g6, H8/g7, G7/h6, Close Clearance ( Spigots and Locations)       

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This fit is for accurate location at moderate speeds and journal pressures, and running on accurate machine parts. Running fits with smaller clearances with general requirements for fit accuracy. Some of the applications: General fits of shafts, machine tool spindles, main fits of machine tools, regulator bearings, sliding rods. Some of the selected Preferred fits: H8/f7, F8/h7, F8/h6, H9/f8, H8/f8, H7/f7, Locational Clearance       

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For locating stationary parts, it provides snug fit. It provides freely assemble and disassemble. This fit helps for precise guiding and centering of parts and mounting by sliding on without use of any great force, after lubrication the parts can be turned and slid by hand. Some of the applications: Roller guides. precise guiding of machines and preparations, exchangeable wheels. Some of the selected Preferred fits: H7/h6, H8/h7, H8/h9, H8/h8, Location- slight interference       

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This type of fit compromise between interference and clearance for accurate location. With this fit, the parts can be assemble or disassemble without great force using a rubber mallet. Some of the applications: Clutches, demountable fits of hubs of gears and pulleys, manual wheels, brake disks. Some of the selected Preferred fits: H7/k6, H8/k7, K7/h6, K8/h7, Location/Transition       

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This fit for accurate location where greater interference permissible. It is fixed fits with small interferences or negligible clearances. Mounting of fits using pressing and light force. Some of the applications: Armatures of electric motors on shafts, gear rims, fixed plugs, driven bushings, flushed bolts. Some of the selected Preferred fits: H7/n6, H8/n7, H8/p7, H7/m6, H8/m7, M8/h6, N7/h6, N8/h7, Location/Interference       

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This type of fit where the assembled parts requiring rigidity and great alignment with prime accuracy of location. Press fit which can be separated, pressed fits with guaranteed interference. Assembly of the parts can be carried out using cold pressing. Some of the applications: Bearing bushings, Hubs of clutch disks. Some of the selected Preferred fits: H7/p6, H7/r6, H8/r7, P7/h6, R7/h6, Medium Drive Fit       

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This fit for shrink fit on light section or ordinary steel parts. Pressed fits with medium interference, assembly of parts using hot pressing, assembly using cold pressing only with use of large forces. the tightest tolerance usable for cast iron. Some of the applications: Permanent coupling of gears with shafts, bearing bushings. Some of the selected Preferred fits: H7/s6, H8/s7, H7/t6, H8/t7, S7/h6, T7/h6, Force Fit       

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This fit suitable for parts which can be highly stressed. Pressed fits with big interferences, assembly using pressing and great forces under different temperatures of the parts. This fit for shrink fits where the heavy pressing forces required are impractical. Some of the applications: Permanent couplings of gears with shafts, flanges. Some of the selected Preferred fits: H7/u6, H8/u7, H8/u8, H8/x8, U7/h6, U8/h7,