256 TECHNICAL INFORMATION H8 H9 H10 h5 h6 h6 h7 h8 h9 Reference Shaft h5 h6 h7 h8 h9 Fitting Clearance Fit Transition Fit Interference Fit Clearance Fit Transition Fit Interference Fit Clearance Fit Clearance Fit Clearance Fit Class of Tolerance Range for Holes M6 JS6 K5 M6 N6 P6 F6 F7 G6 G7 H6 H7 JS6 JS7 K6 K7 M6 M7 N6 N7 P6 P7 R7 S7 T7 U7 X7 E7 F7 F8 H7 H8 D8 D9 E8 E9 F8 H8 H9 B10 C9 C10 D8 D9 D10 E8 E9 H8 H9 Reference Hole H6 H7 H8 H9 H10 Fitting Clearance Fit Transition Fit Interference Fit Clearance Fit Transition Fit Interference Fit Clearance Fit Clearance Fit Clearance Fit Class of Tolerance Range for Shafts f6 g5 g6 h5 h6 js5 js6 k5 k6 m5 m6 n6 p6 e7 f6 f7 g6 h6 h7 js6 js7 k6 m6 n6 p6 r6 s6 t6 u6 x6 d9 e8 e9 f7 f8 h7 h8 c9 d8 d9 g8 e9 h8 h9 b9 c9 d9 Driving Fit Press Fit Strong Press Fit Shrinkage Fit Loose Fit Light Roll Fit Roll Fit Sliding Fit 50 0 −50 −100 −150 −200 Dimension Tolerance H6 H7 200 150 100 50 0 −50 1.2 Interrelation among Tolerance Ranges for Generally Used Hole-basis System of Fits 2.2 Interrelation among Tolerance Ranges for Generally Used Shaft-basis System of Fits * Values in cases where the measurement exceeds the reference dimension 18 mm, but does not exceed 30 mm. * Values in cases where the measurement exceeds the reference dimension 18 mm, but does not exceed 30 mm. (μm) Dimension Tolerance (μm) H6 H7 H8 H9 Applicable Part Functional Classification Application Example Can be Moved Relatively Clearance Fit Loose Fit c9 Part which accommodates a wide gap or movable part which needs a gap. Part which accommodates a wide gap to facilitate assembling. Part which needs an appropriate gap even at a high temperature. Part whose structure needs a gap. Inflates. Large position error Fitting length is long. Cost needs to be reduced. Manufacturing Cost Maintenance Cost Piston Ring and the Ring Groove Fitting by means of a loose set pin. Light Roll Fit d9 d9 Part which accommodates or needs a gap. Crank Web and Pin Bearing(Side) Exhaust Valve Box and the Sliding Part of a Spring Bearing Piston Ring and the Ring Groove e7 e8 e9 Part which accommodates a wide gap or needs a gap. Fairly wide gap, well greased bearing. Bearing subjected to a high temperature, high speed and heavy load (high-degree forced lubrication). Regular Rotary or Sliding Part (Must be well greased.) Regular Fitting (Often comes apart.) Fitting of the Exhaust Valve Box Main Bearing for the Crank Shaft Regular Sliding Part Roll Fit f6 f7 f7 f8 Fitting so as to provide an appropriate gap to permit movement (high-quality fitting). Regular normal temperature bearing lubricated with grease or oil. Part in which a cooled exhaust valve box is inserted. Regular Shaft and Bushing Link Device Lever and Bushing Fine Roll Fit g5 g6 Continuously revolving part of a precision machine under a light load. Fitting with a narrow gap so as to permit movement (spigot and positioning). Precision sliding part. Part required to make a precision motion with virtually no play. Link Device Pin and Lever Key and its Groove Precision Control Valve Rod Cannot be Moved Relatively Transition Fit Sliding Fit h5 h6 h7 h8 h9 Fitting so as to permit movement by hand, with a lubricant applied. (high-quality positioning) Special High Precision Sliding Part Unimportant Stationary Part Can be disassembled, reassembled without damaging component parts. Force cannot be transmitted by the fitting force alone. Fitting a rim and a boss together Fitting the gear of a precision gear device Push Fit h5 h6 js6 Fitting which accommodates a light gap. Precision fitting which locks both parts while the unit is used. Fitting which allows assembling and disassembling with a wooden or lead hammer. Fitting Coupling Flanges Together Governor Path and Pin Fitting a Gear Rim and a Boss Together Driving Fit js5 k6 Fitting which requires an iron hammer or hand press for assembling, disassembling (a key or the like is necessary to prevent inter-part shaft rotation). Precision positioning. Fixing the Shaft of a Gear Pump and a Casing Together Reamer Bolts k5 m6 Same as the above for assembling and disassembling. Precision positioning which allows no gap. Reamer Bolts Fixing the piston of hydraulic equipment and a shaft together Fitting a Coupling Flange and a Shaft Together Light Press Fit m5 n6 Fitting which requires considerable force for assembling, disassembling. Precision stationary fitting (a key or the like is necessary for high torque transmission purposes) Slight force can be transmitted by the fitting force alone. Shaft of a Flexible Coupling and Gear(Passive Side) Precision Fitting Insertion of a Suction Valve and Valve Guide Interference Fit Press Fit n5 n6 p6 Fitting which requires much force for assembling, disassembling(a key or the like is necessary for high torque transmission). Light press fitting or the like is necessary for non-ferrous component parts. Standard press fitting is required for iron component parts and a bronze part and a copper part. Hard to disassemble without damaging component parts. Insertion of a Suction Valve and Valve Guide Fixing a Gear and a Shaft Together(Low Torque) Shaft of a Flexible Coupling and a Gear(Drive Side) p5 r6 Same as the above for assembling and disassembling Shrinkage press fitting, cold press fitting or forced press fitting is required for large component parts. Coupling and Shaft Strong Press Fit, Shrinkage Fit, Freeze Fit Considerable force can be transmitted by the fitting force alone. r5 s6 t6 u6 x6 Firmly coupled together and requires shrinkage press fitting, cold press fitting or forced press fitting. Permanent assembly, which can not be disassembled any further. Press fitting or the like is required for light alloy members. Attaching and Fixing a Bearing Bushing Insertion of a Suction Valve and Valve Box Fixing a Coupling Flange and a Shaft Together(High Torque) Fixing the Rim of a Drive Gear and a Boss Together Attaching and Fixing a Bearing Bushing 1.1 Generally Used Hole-basis System of Fits Reference Hole Class of Tolerance Range for Shafts Clearance Fit Transition Fit Interference Fit H6 g5 h5 js5 k5 m5 f6 g6 h6 js6 k6 m6 n6* p6* H7 f6 g6 h6 js6 k6 m6 n6 p6* r6* s6 t6 u6 x6 e7 f7 h7 js7 H8 f7 h7 e8 f8 h8 d9 e9 H9 d8 e8 h8 c9 d9 e9 h9 H10 b9 c9 d9 [Note]* An exception may arise according to the dimensional sectioning scheme. 2.1 Generally Used Shaft-basis System of Fits Reference Shaft Class of Tolerance Range for Holes Clearance Fit Transition Fit Interference Fit h5 H6 JS6 K6 M6 N6* P6 h6 F6 G6 H6 JS6 K6 M6 N6 P6* F7 G7 H7 JS7 K7 M7 N7 P7* R7 S7 T7 U7 X7 h7 E7 F7 H7 F8 H8 h8 D8 E8 F8 H8 D9 E9 H9 h9 D8 E8 H8 C9 D9 E9 H9 B10 C10 D10 [Note]* An exception may arise according to the dimensional sectioning scheme. GeneralTechnical Information Basis of Fitting Selection / Dimensional Tolerances and Fitting
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