Page 1654 - MiSUMi 2025

[Technical Data]
Basis of Fitting Selection / Dimensional Tolerances and Fitting

Drawing Manual in JIS (How To Use) Series Excerpted and edited from JIS B 0401-1, -2 (1998)

H6 H7 H8 H9 Applicable Part Functional Classification Application Example
Loose Fit c9 Part which accommodates a wide gap or moving part which needs a gap. Part whose structure needs a gap. The fit between the active ring and
Part which accommodates a wide gap to facilitate assembling.
Inflates. Large position error
groove with the fastening pin.
{ Fitting length is long.
Part which needs an appropriate gap even at a high temperature.
Cost needs to be reduced. Fixed position of crank arm and pin shaft (side view)
Can be Moved Relatively Clearance Fit Light Roll Fit Roll Fit f6 e7 e8 e9 Part which accommodates a wide gap or needs a gap. Regular Rotary or Sliding Part Fitting of the Exhaust Valve Box
Manufacturing Cost
Part which accommodates or needs a gap.
d9
d9
Exhaust valve housing and sliding components
{ Maintenance Cost
Piston ring and ring groove
Fairly wide gap, well greased bearing.
Main Bearing for the Crank Shaft
(Must be well greased.)
Bearing subjected to a high temperature, high speed and heavy load (high-degree forced lubrication).
Regular Sliding Part

Fitting so as to provide an appropriate gap to permit movement
Part in which a cooled exhaust valve box is inserted.
Regular Fitting
f7
Regular Shaft and Bushing
(high-quality fitting).
f7
(Often comes apart.)
Pin and rod of the connecting device
Continuously revolving part of a precision machine under a light load.
Fine Roll Fit g5 g6 f8 Regular normal temperature bearing lubricated with grease or oil. Part required to make a precision Link Device Lever and Bushing
Fitting with a narrow gap so as to permit movement (spigot and positioning).
Key and keyway
motion with virtually no play.
Precision control valve rod
Precision sliding part.
Sliding Fit h5 h6 h7 h9 Fitting so as to permit movement by hand, with a lubricant applied. (high-quality positioning) Fitting a Rim and a Boss together
Fitting the Gear of a Precision Gear
Special High Precision Sliding Part
h8
device
Unimportant Stationary Part
Push Fit h5 js6 Fitting which accommodates a light gap. Can be Force cannot be Fitting Coupling Flanges together
Governor Path and Pin
Precision fitting which locks both parts while the unit is used.
h6
Fitting a Gear Rim and a Boss together
Fitting which allows assembling and disassembling with a wooden or lead hammer.
transmitted by the
Clearance Fit Driving Fit js5 m6 Fitting which requires an iron hammer or hand press for assembling, disassembling disassembled, fitting force alone. Fixing the Shaft of a Gear Pump and a Casing
reassembled
(a key or the like is necessary to prevent inter-part shaft rotation).
k6
together
Precision positioning.
Reamer Bolts
without damaging
component parts.
Reamer Bolts
Cannot be Moved Relatively Press Fit Light Press Fit m5 n6 Precision positioning which allows no gap. Slight force can be Fitting a Coupling Flange and a Shaft together
Same as the above for assembling and disassembling.
k5
Fixing the piston of hydraulic equipment and a Shaft together
Fitting which requires considerable force for assembling, disassembling.
Shaft of a Flexible Coupling and Gear (Passive Side)
Precision Fitting
Precision stationary fitting (a key or the like is necessary for high torque
transmission purposes)
Insertion of a Suction Valve and Valve Guide
transmitted by the Insertion of a Suction Valve and Valve Guide
Fitting which requires much force for assembling, disassembling (a key or the like is necessary for high
n5
fitting force alone.
p6
torque transmission). Light press fitting or the like is necessary for non-ferrous component parts.
Fixing a Gear and a Shaft together (Low Torque)
n6
Shaft of a Flexible Coupling and a Gear (Drive Side)
Standard press fitting is required for iron component parts and a bronze part and a copper part.
Interference Fit Strong Press Fit, Shrinkage Fit, Freeze Fit p5 s6 Same as the above for assembling and disassembling Hard to Considerable force Coupling and Shaft
r6
Shrinkage press fitting, cold press fitting or forced press fitting is
required for large component parts.
disassemble
Attaching and Fixing a Bearing Bushing
without damaging
component parts.
Insertion of a Suction Valve and Valve Box
Firmly coupled together and requires shrinkage press fitting, cold
can be transmitted
t6
Fixing a Coupling Flange and a Shaft together
press fitting or forced press fitting. Permanent assembly, which
by the fitting force
r5
(High Torque)
cannot come apart.
alone.
u6
Press fitting or the like is required for light alloy members.
Fixing the Rim of a Drive Gear and a Boss together
Attaching and Fixing a Bearing Bushing
x6
1.1 Fitting, with Regularly Used Hole Adopted as Reference 2.1 Fitting, with Regularly Used Shaft Adopted as Reference
Reference Class of Tolerance Range for Shafts Reference Class of Tolerance Range for Holes
Hole Clearance Fit Transition Fit Interference Fit Shaft Clearance Fit Transition Fit Interference Fit
g5 h5 js5 k5 m5 h5 H6 JS6 K6 M6 N6 * P6
H6
f6 g6 h6 js6 k6 m6 n6 * p6 * h6 F6 G6 H6 JS6 K6 M6 N6 P6 *
f6 g6 h6 js6 k6 m6 n6 p6 * r6 * s6 t6 u6 x6 F7 G7 H7 JS7 K7 M7 N7 P7 * R7 S7 T7 U7 X7
H7
e7 f7 h7 js7 E7 F7 H7
f7 h7 h7 F8 H8
H8 e8 f8 h8 D8 E8 F8 H8
d9 e9 h8 D9 E9 H9
d8 e8 h8 D8 E8 H8
H9 c9 d9 e9 h9 h9 C9 D9 E9 H9
H10 b9 c9 d9 B10 C10 D10
[Note]*An exception may arise according to the dimensional sectioning scheme. [Note]*An exception may arise according to the dimensional sectioning scheme.
1.2 Interrelation between Tolerance Ranges-Fitting with Regularly Used Hole Adopted as Reference 2.2 Interrelation between Tolerance Ranges-Fitting with Regularly Used Shaft Adopted as Reference
H8
H7
Reference Hole H6 Clearance Fit Transition Fit Interference Fit Clearance Fit H9 H10 Reference Shaft h5 h6 h7 h8 h9
Clearance Fit Transition Fit Interference Fit Sliding Fit Driving Fit Press Fit Strong Press Fit Shrinkage Fit Loose Fit Light Roll Fit Roll Fit Clearance Fit Clearance Fit Clearance Fit Transition Fit Interference Fit Clearance Fit Fit Interference Fit Clearance Fit Clearance Fit Clearance Fit
Fitting Fitting Transition
Class of Tolerance Range for Shafts f6 g5 g6 h5 h6 js5 js6 k5 k6 m5m6 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 Class of Tolerance Range for Holes H6 JS6 K5 M6 N6 P6 F6 F7 G6 G7 H6 H7 JS6JS7 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
50 200
H10
H9
H6 H7 H8
0 150
Dimension Tolerance －50 Dimension Tolerance 100
－100 50
(Om) (Om)
－150 0 h5 h6 h6 h7
h8
h9
－200 －50
B-009
*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.