〔 TECHNICAL DATA 〕 FIT SELECTION BASICS / DIMENSIONAL TOLERANCE AND FITS EXCERPT FROM USAGE OF JIS SERIES MANUAL FOR DESIGNING (PRECISION VER.) REFERENCE: JIS B 0401 (2016)
〔 TECHNICAL DATA 〕 DIMENSIONAL TOLERANCES OF COMMONLY USED FITS REFERENCE: JIS B 0401–1 (2016)
Dimensional tolerances used in the shaft of a regular fits Classification of basic size (mm)
H6 H7 H8 H9
Applicable part
Functional classification
Application example
Tolerance zone class of shaft
Unit μm
Functionally, the part that requires large clear- ance space. Expands. Positional error is large. Length of fit is long. For reducing the cost. Production cost Maintenance cost
c9 The moving part that allows a particularly large clearance space or requires clearance space. The part where the clearance is increased to make assembly easier. The part that requires adequate clearance space even at high temperatures.
Piston ring and ring groove Loose safety pin fit
Over Or less b9 c9 d8 d9 e7 e8 e9 f6 f7 f8 g5 g6 h5 h6 h7 h8 h9 js5 js6 js7 k5 k6 m5 m6 n5 ＊ n6 p6 r6 s6 t6 u6 x6
+ 4 0 + 6 + 1 + 7 + 1
+ 6 0 + 9 + 1
+ 6 + 2 + 9 + 4
+ 8 + 2
+ 8 + 4
+ 10 + 4 + 16 + 8 + 19 + 10
+ 12 + 6 + 20 + 12 + 24 + 15
+ 16 + 10 + 23 + 15 + 28 + 19
+ 20 + 14 + 27 + 19 + 32 + 23
+ 24 + 18 + 31 + 23 + 37 + 28
+ 26 + 20 + 36 + 28 + 43 + 34 + 51 + 40 + 56 + 45 + 67 + 54 + 77 + 64
–140 –165 –140 –170 –150 –186
–60 –85
–20 –34 –30 –48 –40 –62
–20 –45 –30 –60 –40 –76
–14 –24 –20 –32 –25 –40
–14 –28 –20 –38 –25 –47
–14 –39 –20 –50 –25 –61
–6 –12 –10 –18 –13 –22
–6 –16 –10 –22 –13 –28
–6 –20 –10 –28 –13 –35
–2 –6 –4 –9
–2 –8
0 –4 0 –5 0 –6
0 –6 0 –8 0 –9
0 –10 0 –12 0 –15
0 –14 0 –18 0 –22
0 –25 0 –30 0 –36
± 2
± 3
± 5
– 3
–
Crank web and pin bearing (Side surface) Exhaust valve cage and traveling part of spring sheet Piston ring and ring groove
+ 12 + 4 + 15 + 6
+ 13 + 8 + 16 + 10
–70 –100 –80 –116
–4 –12 –5 –14
d9 d9 The part that allows a large clearance space or needs clearance space.
± 2.5 ± 4
± 6
3 6
–
+ 10 + 1
+ 12 + 6
–5 –11
± 3
± 4.5 ± 7.5
6 10
–
The moving part that allows a slightly large clearance space or requires clearance space. The bearing part which has a slightly large clearance space and good lubrication. The bearing part that works under high temperature, high speed and high load (high grade force–feed lubrication).
Fit of exhaust valve seat Main bearing for crankshaft
Shoulder Bolts MSB (e9) Stopper Bolts STBG (e9) Puller Bolts PBTN (e9)
The general rotating or traveling part. (Good lubrication is required)
e7 e8 e9
10 14
+ 20 + 12
+ 23 + 12
+ 29 + 18
+ 34 + 23
+ 39 + 28
+ 44 + 33
+ 9 + 1
+ 12 + 1
+ 15 + 7
+ 18 + 7
–150 –193
–95 –138
–50 –77
–50 –93
–32 –50
–32 –59
–32 –75
–16 –27
–16 –34
–16 –43
–6 –14
–6 –17
0 –8
0 –11
0 –18
0 –27
0 –43
General traveling part
± 4
± 5.5 ± 9
–
14 18
Insertion part of cooling exhaust valve cage Return Pins (f6) General shaft and bushing Runner Lock Pins (f6) Lever for link system and bushing Pin for link system and lever Key and key groove Valve stem of precision control valve Pusher Pins PSP (g6)
Ordinary fit parts. (Disassembling is often done)
f7 f8
Fit which can be mobile due to proper clearance space (high grade fit). The general grease or oil lubricated room temperature bearing part.
+ 54 + 41 + 61 + 48 + 76 + 60 + 86 + 70
f6 f7
18 24
–
+ 11 + 2
+ 15 + 2
+ 17 + 8
+ 21 + 8
+ 24 + 15
+ 28 + 15
+ 35 + 22
+ 41 + 28
+ 48 + 35
–160 –212
–110 –162
–65 –98
–65 –117
–40 –61
–40 –73
–40 –92
–20 –33
–20 –41
–20 –53
–7 –16
–7 –20
0 –9
0 –13
0 –21
0 –33
0 –52
± 4.5 ± 6.5 ± 10.5
+ 54 + 41 + 64 + 48 + 70 + 54 + 85 + 66 + 94 + 75
24 30
The continuous rotary part of light load precision machine. Fit which can be mobile in spite of small clearance space (spigot and positioning). Precision traveling part. h9 Fit which can be moved manually using a lubricator (high grade positioning). Special precision traveling part. Stationary part which is not of great importance. Mounting part which is given a little interference. High–precision positioning with mutual immobility during use. Fit which can be assembled and disassembled by wood or lead hammer. Fit which can be assembled and disassembled by an iron hammer or hand press (Key or such items are required to prevent other components from rotating). High–precision positioning.
The part which requires precision movement without any slack.
–170 –232 –180 –242 –190 –264 –200 –274 –220 –307 –240 –327 –260 –360 –280 –380 –310 –410 –340 –455 –380 –495 –420 –535 –480 –610 –540 –670 –600 –740 –680 –820 –760 –915 –840 –995
–120 –182 –80 –119
g5 g6
30 40
+ 13 + 2
+ 18 + 2
+ 20 + 9
+ 25 + 9
+ 28 + 17
+ 33 + 17
+ 42 + 26
+ 50 + 34
+ 59 + 43
–80 –142
–50 –75
–50 –89
–50 –112
–25 –41
–25 –50
–25 –64
–9 –20
–9 –25
0 –11
0 –16
0 –25
0 –39
0 –62
± 5.5 ± 8 ± 12.5
–
–130 –192
40 50
Fit of rim and boss Fit of toothed gear of precision gear mechanism Dowel Pins MSTH (h7) Sprue Bushings (h6)
h7 h8
+ 60 + 41 + 62 + 43 + 73 + 51 + 76 + 54 + 88 + 63 + 90 + 65 + 93 + 68
+ 72 + 53 + 78 + 59 + 93 + 71
+ 106 + 87 + 121 + 102 + 146 + 124 + 166 + 144
–140 –214 –100 –146
h5 h6
50 65
+ 15 + 2
+ 21 + 2
+ 24 + 11
+ 30 + 11
+ 33 + 20
+ 39 + 20
+ 51 + 32
–100 –174
–60 –90
–60 –106
–60 –134
–30 –49
–30 –60
–30 –76
–10 –23
–10 –29
0 –13
0 –19
0 –30
0 –46
0 –74
± 6.5 ± 9.5 ± 15
–
–150 –224
65 80
Fit between joint flanges Governor way and pin Fit of rim of toothed gear and boss
h5 h6
+ 113 + 91 + 126 + 104 + 147 + 122 + 159 + 134 + 171 + 146
–170 –257 –120 –174
js6
80 100
+ 18 + 3
+ 25 + 3
+ 28 + 13
+ 35 + 13
+ 38 + 23
+ 45 + 23
+ 59 + 37
Transmission of power cannot be done by only junction power of fit.
–120 –207
–72 –107
–72 –126
–72 –159
–36 –58
–36 –71
–36 –90
–12 –27
–12 –34
0 –15
0 –22
0 –35
0 –54
0 –87
± 7.5 ± 11 ± 17.5
–
+ 101 + 79 + 117 + 92 + 125 + 100 + 133 + 108 + 151 + 122 + 159 + 130 + 169 + 140
–180 –267 –200 –300 –210 –310 –230 –330 –240 –355 –260 –375 –280 –395
Capable of assembling and disassembling without damaging components.
100 120
Fixing of gear pump shaft and casing Reamer bolt
js5 k6
120 140
Press–fit Section of Tapered Pin Sets (k6)
+ 21 + 3
+ 28 + 3
+ 33 + 15
+ 40 + 15
+ 52 + 27
+ 68 + 43
–145 –208
–145 –245
–85 –125
–85 –148
–85 –185
–43 –68
–43 –83
–43 –106
–14 –32
–14 –39
0 –18
0 –25
0 –40
0 –63
0 –100
± 9 ± 12.5 ± 20
140 160
–
–
–
Reamer bolt Dowel Pins MSTM (m6) Fixing of piston of hydraulic system and shaft Ball Buttons BBT (k5) Fit of joint flange and shaft
Same as above for assembling and disassembling. High–precision positioning which does not allow any clearance space.
k5 m6
160 180
+ 106 + 77 + 109 + 80 + 113 + 84 + 126 + 94 + 130 + 98 + 144 + 108 + 150 + 114 + 166 + 126 + 172 + 132
180 200
Fit which requires considerable power for assembling and disassembling. High–precision fixed mounting (Key or such items are required for large torque transmission). Fit which requires much power for assembling and disassembling. (Key or such items are required for large torque trans- mission). However, when non–ferrous components are fitted together, press fit power will be at the level of light press fit. Standard press fit fixing between iron and iron or between bronze and copper.
Flexible shaft coupling and gear (passive side) High precision fit
m5 n6
Guide pins & bushings (m5)
+ 24 + 4
+ 33 + 4
+ 37 + 17
+ 46 + 17
+ 60 + 31
+ 79 + 50
–170 –242
–170 –285
–100 –146
–100 –172
–100 –215
–50 –79
–50 –96
–50 –122
–15 –35
–15 –44
0 –20
0 –29
0 –46
0 –72
0 –115
± 10 ± 14.5 ± 23
200 225
–
–
–
–
Inlet valve, valve guide insertion
Angular Pins (m5)
Small power can be transmitted by junction power of fit.
225 250
Inlet valve, valve guide insertion Dowel Pins MST (p6) Fixing of gear and shaft (small torque) Stopper Pins STPN (p6) Flexible shaft coupling and gear (active side)
n5 n6
p6
–300 –430 –190 –271
250 280
+ 27 + 4
+ 36 + 4
+ 43 + 20
+ 52 + 20
+ 66 + 34
+ 88 + 56
–190 –320
–110 –162
–110 –191
–110 –240
–56 –88
–56 –108
–56 –137
–17 –40
–17 –49
0 –23
0 –32
0 –52
0 –81
0 –130
± 11.5 ± 16 ± 26
–
–
–
–
–
–330 –460
280 315
Same as above for assembling and disassembling. Shrinkage fit, cooling fit and strong press fit for large dimension components.
p5 r6
Joint and shaft
–360 –500 –210 –299
315 355
Hard to disassemble without damaging components.
+ 29 + 4
+ 40 + 4
+ 46 + 21
+ 57 + 21
+ 73 + 37
+ 98 + 62
–210 –350
–125 –182
–125 –214
–125 –265
–62 –98
–62 –119
–62 –151
–18 –43
–18 –54
0 –25
0 –36
0 –57
0 –89
0 –140
± 12.5 ± 18 ± 28.5
–
–
–
–
–
–400 –540
Insertion and fixing of bearing bush
s6
355 400
Considerable power can be transmitted by junction power of fit.
–440 –595 –230 –327
Inlet valve, valve seat insertion Fixing of joint flange and shaft (large torque)
t6
400 450
Fixed firmly together, so that permanent assembling can be sought with shrinkage fit, cooling fit and strong press fit for assembling. Press fit for light alloy.
+ 32 + 5
+ 45 + 5
+ 50 + 23
+ 63 + 23
+ 80 + 40
+ 108 + 68
–230 –385
–135 –198
–135 –232
–135 –290
–68 –108
–68 –131
–68 –165
–20 –47
–20 –60
0 –27
0 –40
0 –63
0 –97
0 –155
± 13.5 ± 20 ± 31.5
r5
–
–
–
–
–
–480 –635
u6
450 500
Fixing of driving gear rim and boss Insertion and fixing of bearing bush
Dimensional tolerances of holes used in regular fits Classification of basic size (mm)
x6
Tolerance zone class of hole
Unit μm
E Printed in red are listed with applicable examples of plastic mold parts.
1.1 Commonly used hole–basis fits Basic hole
2.1 Commonly used shaft–basis fits Basic shaft
Tolerance zone class of shaft
Tolerance zone class of hole
Over Or less B10 C9 C10 D8 D9 D10 E7 E8 E9 F6 F7 F8 G6 G7 H6 H7 H8 H9 H10 JS6 JS7 K6 K7 M6 M7 N6 N7 P6 P7 R7 S7 T7 U7 X7
Clearance fit
Clearance fit
Transition fit
Interference fit
Transition fit
Interference fit
+ 180 + 140 + 188 + 140 + 208 + 150
+ 85 + 60
+ 100 + 60 + 118 + 70 + 138 + 80
+ 34 + 20 + 48 + 30 + 62 + 40
+ 45 + 20 + 60 + 30 + 76 + 40
+ 60 + 20 + 78 + 30 + 98 + 40
+ 24 + 14 + 32 + 20 + 40 + 25
+ 28 + 14 + 38 + 20 + 47 + 25
+ 39 + 14 + 50 + 20 + 61 + 25
+ 12 + 6 + 18 + 10 + 22 + 13
+ 16 + 6 + 22 + 10 + 28 + 13
+ 20 + 6 + 28 + 10 + 35 + 13
+ 8 + 2
+ 12 + 2 + 16 + 4 + 20 + 5
+ 6 0 + 8 0 + 9 0
+ 10 0 + 12 0 + 15 0
+ 14 0 + 18 0 + 22 0
+ 25 0 + 30 0 + 36 0
+ 40 0 + 48 0 + 58 0
0 –6
0 –10
–2 –8 –1 –9
–2 –12 0 –12 0 –15
–4 –10 –5 –13 –7 –16
–4 –14 –4 –16 –4 –19
–6 –12 –9 –17 –12 –21
–6 –16 –8 –20 –9 –24
–10 –20 –11 –23 –13 –28
–14 –24 –15 –27 –17 –32
–18 –28 –19 –31 –22 –37
–20 –30 –24 –36 –28 –43 –33 –51 –38 –56 –46 –67 –56 –77
± 3
± 5
H6 JS6 K6 M6 N6 ＊
– 3
–
h5
g5 h5 js5 k5 m5 f6 g6 h6 js6 k6 m6 n6 ＊ f6 g6 h6 js6 k6 m6 n6
P6
H6
p6 ＊ p6 ＊
P6 ＊ P7 ＊
F6 G6 H6 JS6 K6 M6 N6 F7 G7 H7 JS7 K7 M7 N7
+ 100 + 70 + 116 + 80
+ 12 + 4 + 14 + 5
+ 2 –6 + 2 –7
+ 3 –9
h6
± 4
± 6
3 6
–
r6 ＊
s6 t6 u6 x6
R7 S7 T7 U7 X7
H7
+ 5 –10
–3 –12
e7 f7
h7 js7
E7 F7
H7 H8 H8 H9 H8 H9
± 4.5 ± 7.5
–
6 10
h7
f7
h7 h8
F8
H8
e8 f8
D8 E8 F8
10 14
+ 220 + 150
+ 138 + 95
+ 165 + 95
+ 77 + 50
+ 93 + 50
+ 120 + 50
+ 50 + 32
+ 59 + 32
+ 75 + 32
+ 27 + 16
+ 34 + 16
+ 43 + 16
+ 17 + 6
+ 24 + 6
+ 11 0
+ 18 0
+ 27 0
+ 43 0
+ 70 0
+ 2 –9
+ 6 –12
h8
–4 –15
0 –18
–9 –20
–5 –23
–15 –26
–11 –29
–16 –34
–21 –39
–26 –44
± 5.5 ± 9
–
d9 e9 d8 e8
D9 E9 D8 E8
14 18
h8 h9
H9
h9
c9 d9 e9
C9 D9 E9
–33 –54 –40 –61 –51 –76 –61 –86
18 24
–
+ 244 + 160
+ 162 + 110
+ 194 + 110
+ 98 + 65
+ 117 + 65
+ 149 + 65
+ 61 + 40
+ 73 + 40
+ 92 + 40
+ 33 + 20
+ 41 + 20
+ 53 + 20
+ 20 + 7
+ 28 + 7
+ 13 0
+ 21 0
+ 33 0
+ 52 0
+ 84 0
+ 2 –11
+ 6 –15
H10 b9 c9 d9 [Note] ＊ There may be exceptions to these fits depending on the size classification.
–4 –17
0 –21
–11 –24
–7 –28
–18 –31
–14 –35
–20 –41
–27 –48
B10 C10 D10 [Note] ＊ There may be exceptions to these fits depending on the size classification.
± 6.5 ± 10.5
–33 –54 –39 –64 –45 –70 –55 –85 –64 –94
24 30
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
+ 270 + 170 + 280 + 180 + 310 + 190 + 320 + 200 + 360 + 220 + 380 + 240 + 420 + 260 + 440 + 280 + 470 + 310 + 525 + 340 + 565 + 380 + 605 + 420 + 690 + 480 + 750 + 540 + 830 + 600 + 910 + 680
+ 182 + 120 + 192 + 130 + 214 + 140 + 224 + 150 + 257 + 170 + 267 + 180 + 300 + 200 + 310 + 210 + 330 + 230 + 355 + 240 + 375 + 260 + 395 + 280 + 430 + 300 + 460 + 330 + 500 + 360 + 540 + 400 + 595 + 440 + 635 + 480
+ 220 + 120 + 119 + 80 + 260 + 140 + 146 + 100 + 230 + 130 + 310 + 170 + 174 + 120 + 270 + 150
30 40
Basic hole
H6
H7
H8
H9
H10
Basic shaft
h5
h6
h7
h8
h9
+ 3 –13
+ 7 –18
+ 142 + 80
+ 180 + 80
+ 75 + 50
+ 89 + 50
+ 112 + 50
+ 41 + 25
+ 50 + 25
+ 64 + 25
+ 25 + 9
+ 34 + 9
+ 16 0
+ 25 0
+ 39 0
+ 62 0
+ 100 0
–4 –20
0 –25
–12 –28
–8 –33
–21 –37
–17 –42
–25 –50
–34 –59
± 8 ± 12.5
–
Clearance fit Transition fit Interference fit
Clearance fit
40 50
Fit
Fit
–30 –60 –32 –62 –38 –73 –41 –76 –48 –88 –50 –90 –53 –93
–42 –72 –48 –78 –58 –93
–76 –106 –91 –121 –111 –146 –131 –166
50 65
+ 174 + 100
+ 220 + 100
+ 90 + 60
+ 106 + 60
+ 134 + 60
+ 49 + 30
+ 60 + 30
+ 76 + 30
+ 29 + 10
+ 40 + 10
+ 19 0
+ 30 0
+ 46 0
+ 74 0
+ 120 0
+ 4 –15
+ 9 –21
–5 –24
0 –30
–14 –33
–9 –39
–26 –45
–21 –51
± 9.5 ± 15
–
Tolerance zone 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 zone class of hole 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
65 80
–78 –113 –91 –126 –107 –147 –119 –159 –131 –171
80 100
+ 207 + 120
+ 260 + 120
+ 107 + 72
+ 126 + 72
+ 159 + 72
+ 58 + 36
+ 71 + 36
+ 90 + 36
+ 34 + 12
+ 47 + 12
+ 22 0
+ 35 0
+ 54 0
+ 87 0
+ 140 0
+ 4 –18
+ 10 –25
–6 –28
0 –35
–16 –38
–10 –45
–30 –52
–24 –59
± 11 ± 17.5
–
+ 320 + 180 + 360 + 200 + 370 + 210 + 390 + 230 + 425 + 240 + 445 + 260 + 465 + 280
–66 –101 –77 –117 –85 –125 –93 –133 –105 –151 –113 –159 –123 –169
100 120
50
200
H10
120 140
H9
+ 54 + 14
+ 25 0
+ 40 0
+ 63 0
+ 100 0
+ 160 0
+ 4 –21
+ 12 –28
+ 208 + 145
+ 245 + 145
+ 305 + 145
+ 125 + 85
+ 148 + 85
+ 185 + 85
+ 68 + 43
+ 83 + 43
+ 106 + 43
+ 39 + 14
–8 –33
0 –40
–20 –45
–12 –52
–36 –61
–28 –68
H8
± 12.5 ± 20
140 160
–
–
H7
H6
0
150
160 180
–60 –106 –63 –109 –67 –113 –74 –126 –78 –130 –87 –144 –93 –150 –103 –166 –109 –172
180 200
–50
100
+ 242 + 170
+ 285 + 170
+ 355 + 170
+ 146 + 100
+ 172 + 100
+ 215 + 100
+ 79 + 50
+ 96 + 50
+ 122 + 50
+ 44 + 15
+ 61 + 15
+ 29 0
+ 46 0
+ 72 0
+ 115 0
+ 185 0
+ 5 –24
+ 13 –33
–8 –37
0 –46
–22 –51
–14 –60
–41 –70
–33 –79
± 14.5 ± 23
200 225
–
–
–
225 250
+ 510 + 300 + 271 + 190 + 590 + 360 + 299 + 210 + 540 + 330 + 690 + 440 + 327 + 230 + 630 + 400
–100
50
250 280
+ 320 + 190
+ 400 + 190
+ 162 + 110
+ 191 + 110
+ 240 + 110
+ 88 + 56
+ 108 + 56
+ 137 + 56
+ 49 + 17
+ 69 + 17
+ 32 0
+ 52 0
+ 81 0
+ 130 0
+ 210 0
+ 5 –27
+ 16 –36
–9 –41
0 –52
–25 –57
–14 –66
–47 –79
–36 –88
± 16 ± 26
–
–
–
–
280 315
–150
0
315 355
h5
h6
h6
+ 214 + 125
+ 265 + 125
+ 98 + 62
+ 119 + 62
+ 151 + 62
+ 54 + 18
+ 75 + 18
+ 36 0
+ 57 0
+ 89 0
+ 140 0
+ 230 0
+ 7 –29
+ 17 –40
+ 350 + 210
+ 440 + 210
+ 182 + 125
–10 –46
0 –57
–26 –62
–16 –73
–51 –87
–41 –98
h7
± 18 ± 28.5
–
–
–
–
h8
h9
355 400
+ 1010 + 760 + 1090 + 840
400 450
–200
–50
+ 385 + 230
+ 480 + 230
+ 198 + 135
+ 232 + 135
+ 290 + 135
+ 108 + 68
+ 131 + 68
+ 165 + 68
+ 60 + 20
+ 83 + 20
+ 40 0
+ 63 0
+ 97 0
+ 155 0
+ 250 0
+ 8 –32
+ 18 –45
–10 –50
0 –63
–27 –67
–17 –80
–55 –95
–45 –108
± 20 ± 31.5
–
–
–
–
+ 730 + 480
1217
1218
450 500
＊ The above table shows the case when basic size is over 18mm to 30mm.
＊ The above table shows the case when basic size is over 18mm to 30mm.
Note: This table shows that the upper figures are the upper dimensional tolerance and the lower figures are the lower dimensional tolerance. [Note] ＊ : n5 is an old JIS standard. It has been listed as it applies to many MISUMI products.
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