H6 H7 H8 H9 Applicable part Functional classification Application example The part which allows a large clearance space or the part requires Functionally, the part which requires large clearance space Piston ring and piston ring groove c9 clearance space. The part which can be enlarged to make clearance Expanse. Positioning error is large. space to make assembly easier. Fit of loosening safety pin Length of fit is long. Loose fit The part which requires proper clearance space in the high temperature. For reducing Crank web and pin bearingSide surface) ( The part which allows a large clearance space or d9 d9 Production cost Exhaust valve cage and traveling part of spring sheet the part requires clearance space. Safety cost Piston ring and piston ring groove The part which allows a slight clearance space or the part requires clearance space high grade fit) ( . Fit of exhaust valve seat Shoulder Bolts MSB(e9) The bearing part which has slight clearance space and good lubrication. Light rolling fit e7 e8 e9 The general rotating or traveling part. Main bearing for crankshaft Stopper Bolts STBG(e9) The bearing part which is working under the condition of high temperature, (The condition of good lubrication is required.) high speed and high load high grade pressure feed lubrication) ( . General traveling part Puller Bolts PBNT(e9) Clearance fit ’TECHNICAL DATA» f7 Fit which can be mobile due to proper clearance space high grade fit) Ordinary fit parts. ( . Insertion part of cooling exhaust valve cage Return Pins(f6) f6 f7 General shaft and bushing Runner Lock Pins(f6) Can be moved relatively (Disassembling is often done.) f8 The general cold bearing part of grease or oil lubrication. Lever for link system and bushing Rolling fit The continuous rotary part of light load precision machine. The part which requires precision Pin for link system and lever g5 g6 Fit which can be mobile in spite of small clearance space Key and key groove movement without any slack. . Valve stem of precision control valve Pusher Pins PSP(g6) Precision (spigot and positioning) Precision traveling part. FIT SELECTION BASICS h7 Fit which can be moved manually with using a lubricator high grade positioning) ( . Fit of rim and boss h5 h6 h9 Special precision traveling part. Fit of toothed gear of precision gear mechanism h8 Lubricated fit rolling fit Stationary part which is not of great importance. Dowel Pins MSTH(h7)Sprue Bushings(h6) Mounting part which is given a little leeway. Capable of Fit between joint flanges h5 assembling and js6 High-precision positioning where both are unmobile. Transmission of Governor way and pin h6 Push fit Fit which can be assembled and disassembled by wood or lead hammer. disas-sembling power cannot be Fit of rim of toothed gear and boss without done by only Fit which can be assembled and disassembled by an iron hammer or hand press . Fixation of gear pump shaft and casing damaging junction power of js5 k6 (Key or such items are required to prevent other components from rotating). Reamer bolt Press-fit Section of Tapered Pin Sets(k6) components. fit. High-precision positioning. Transition fit Reamer bolt Dowel Pins MSTM(m6) Driving fit Same as the above for assembling and disassembling Fixation of piston of hydraulic system and shaft Ball Buttons BBT(k5) k5 m6 High-precision positioning which does not tolerate any clearance space. Fit of joint flange and shaft Fit which requires considerable power for assembling and disassembling. Flexible plate coupling and gear passive side) ( m5 n6 High-precision fixed mounting. Precision fit Leader Pins & Bushings(m5) Small power can MANUAL FOR DESIGNING Insertion of valve guide for inlet valve Angular Pins(m5) Light press fit (Key or such items are required for large torque transmission.) be transmitted by Fit which requires much power for assembling and disassembling.(Key or such items are required junction power of Insertion of valve guide for inlet valve Dowel Pins MST(p6) n5 p6 for large torque transmission.) However, when non-ferrous components are fitted together, press fit. Fixation of gear and shaft small torque)Stopper Pins STPN(p6) ( n6 fit power will be activated.Standard press fit fixing between iron and iron or between bronze and copper. Flexible plate coupling and gear active side) Cannot be moved relatively ( Press fit Same as the above for assembling and disassembling p5 r6 Joint and shaft Shrinkage fit, cooling fit and strong press fit for large dimension compo-nents. Hard to EXCERPT FROM¤USAGE OF JIS SERIES" disassemble (PRECISION VER.) r5 s6 without Fixation of bushing for bearing Considerable damaging Insertion of valve guide for inlet valve t6 Fixed firmly together, so that permanent assembling can be sought with power can be Interference fit components. shrinkage fit, cooling fit and strong press fit for assembling. Press fit for light alloy. transmitted by Fixation of joint flange and shaft(large torque) u6 junction power of fit. Fixation of driving gear and boss Strong press fitCShrinkage fitCCooling fit x6 Fixation of bushing for bearing Printed in red are listed with applicable examples of mold parts.1.1 Commonly used hole-basis fits 2.1 Commonly used shaft-basis system of fits Basic Tolerance zone class of shaft Tolerance zone class of hole hole Basic shaft Clearance fit Transition fit Interference fit 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 * F6 G6 H6 JS6 K6 M6 N6 P6 * h6 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 h7 f7 h7 F8 H8 H8 e8 f8 h8 D8 E8 F8 H8 h8 d9 e9 D9 E9 H9 d8 e8 h8 D8 E8 H8 H9 c9 d9 e9 h9 h9 C9 D9 E9 H9 ’TECHNICAL DATA» H10 b9 c9 d9 B10 C10 D10Notice*Fits will make exceptions according to the size steps. Notice*Fits will make exceptions according to the size steps.1.2 Mutual relations of tolerance zone in commonly used hole-basis system of fits 2.2 Mutual relations of tolerance zone in commonly used shaft-basis system of fits Basic hole H6 H7 H8 H9 H10 Basic shaft h5 h6 h7 h8 h9 Clearance fit Transition fit Interference fit Clearance fit Clearance Transition Clearance Clearance Clearance Transition Interference Clearance Clearance Clearance fit Fit Fit fit fit fit fit fit fit fit fit fit fit Press fit Clearance fit Rolling fit Driving fit Transition Interference fit Interference fit Shrinkage fit Loose rolling fit Strong press fit Light rolling fit Lubricated fit Tolerance range class of shaft 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 Tolerance range class of shaft 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 50 200 H10 H9 H7 H8 H6 0 150 -50 100 Variation of tolerance Variation of tolerance(Om) (Om) -100 50 DIMENSIONAL TOLERANCE AND FITS EXCERPT FROM -150 0 h5 h6 h6 h7 h8 h9 -200 -50 JIS B 0401(1986)*This table shows the case when basic size is over 18mm to 30mm. *This table shows the case when basic size is over 18mm to 30mm.