Page 968 - MiSUMi FA Mechanical Components Economy Series
P. 968

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

              Drawing Manual in JIS (How To Use) Series   Excerpted and edited from JIS B0401-1, -2 (1998)



                  H6  H7  H8  H9         Applicable Part        Functional Classifi cation  Application Example
                Loose Fit  c9  Part which accommodates a wide gap or moving part which needs a gap. Part whose structure needs a gap.  Piston Ring and the Ring Groove
                             Part which accommodates a wide gap to facilitate assembling.
                                                                Infl ates. Large position error
                                                                                Fitting by means of a loose set pin.
                                                               { Fitting length is long.
                             Part which needs an appropriate gap even at a high temperature.
                                                             Cost needs to be reduced.  Crank Web and Pin Bearing(Side)
            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
                        d9
                           d9
                             Part which accommodates or needs a gap.
                                                                                Exhaust Valve Box and the Sliding Part of a Spring Bearing
                                                               { Maintenance Cost
                                                                                Piston Ring and the 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

                                                                                Part in which a cooled exhaust valve box is inserted.
                             Fitting so as to provide an appropriate gap to permit movement(high-quality
                                                             Regular Fitting
                        f7
                                                                                Regular Shaft and Bushing
                             fi tting).
                     f7
                                                              (Often comes apart.)
                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
                             Continuously revolving part of a precision machine under a light load.
                                                                                Link Device Pin and Lever
                             Fitting with a narrow gap so as to permit movement(spigot and positioning).
                                                                                Key and its Groove
                                                             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
                             Unimportant Stationary Part
                                                                                device
                Push Fit  h5  js6  Fitting which accommodates a light gap.  Can be   Force cannot be   Fitting Coupling Flanges Together
                             Precision fi tting which locks both parts while the unit is used.
                                                                                Governor Path and Pin
                  h6
                             Fitting which allows assembling and disassembling with a wooden or lead hammer.
                                                                                Fitting a Gear Rim and a Boss Together
              Clearance Fit  Driving Fit  js5  m6  Fitting which requires an iron hammer or hand press for assembling, disassembling  disassembled,   fi tting force alone.  Fixing the Shaft of a Gear Pump and a Casing
                                                                      transmitted by the
                     k6
                                                                                Together
                                                             reassembled
                             (a key or the like is necessary to prevent inter-part shaft rotation).
                             Precision positioning.
                                                                                Reamer Bolts
                                                             without damaging
                                                             component parts.
             Cannot be Moved Relatively  Light Press Fit Press Fit  m5  n6  Precision positioning which allows no gap.  Slight force can be   Fitting a Coupling Flange and a Shaft Together
                                                                                Reamer Bolts
                             Same as the above for assembling and disassembling.
                                                                                Fixing the piston of hydraulic equipment and a shaft together
                  k5
                             Fitting which requires considerable force for assembling, disassembling.
                                                                                Shaft of a Flexible Coupling and Gear(Passive Side)
                             Precision stationary fi tting(a key or the like is necessary for high torque
                                                                                Precision Fitting
                                                                                Insertion of a Suction Valve and Valve Guide
                             transmission purposes)
                                                                      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
                                                                      fi tting force alone.
                                                                                Fixing a Gear and a Shaft Together(Low Torque)
                             torque transmission). Light press fi tting or the like is necessary for non-ferrous component parts.
                     p6
                  n6
                             Standard press fi tting is required for iron component parts and a bronze part and a copper part.
                                                                                Shaft of a Flexible Coupling and a Gear(Drive Side)
              Interference Fit  Strong Press Fit, Shrinkage Fit, Freeze Fit  p5  r6  Same as the above for assembling and disassembling  Hard to   Considerable force   Coupling and Shaft
                             Shrinkage press fi tting, cold press fi tting or forced press fi tting is required for large
                             component parts.
                                                             disassemble
                                                                                Attaching and Fixing a Bearing Bushing
                     s6
                                                             without damaging
                                                             component parts.
                                                                                Insertion of a Suction Valve and Valve Box
                             Firmly coupled together and requires shrinkage press fi tting, cold
                                                                      can be transmitted
                     t6
                             press fi tting or
                                                                                Fixing a Coupling Flange and a Shaft
                                                                      by the fi tting force
                  r5
                                                                                Together(High Torque)
                             forced press fi tting. Permanent assembly, which can not come apart.
                                                                      alone.
                     u6
                             Press fi tting or the like is required for light alloy members.
                                                                                Fixing the Rim of a Drive Gear and a Boss Together
                     x6
                                                                                Attaching and Fixing a Bearing Bushing
           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                      h7       E7 F7  H7
                        f7  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
           Reference Hole  H6  Clearance Fit Transition Fit Interference Fit Clearance Fit  H9  H10  Reference Shaft  h5  h6  h7  h8  h9
                                  H7
             Fitting  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  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 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
      965  *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.
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