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The required pressure for Force fit to assemble cylindrical parts not only depends on allowance but also the surface fitted area. Based on surface area the fitted pressure will increase in proportion to the distance that the inner surface bore/hub is pressed in. The approximate ultimate pressure (in tons) can be determined by using following formulae;


P = Required ultimate pressure, in tons,
A = Contacted surface area between Hole/bore and Shaft.
F = Pressure Factor
a = Total allowance, in inches


Shaft Diameter (Inches)Pressure Factor (F) Shaft Diameter(Inches)Pressure Factor (F)
1.005005.2586
1.253955.5082
1.503255.7578
1.752756.075
2.002406.2572
2.252126.5069
2.501896.7566
2.751707.0064
3.001557.2561
3.251457.5059
3.501317.7557
3.751228.0055
4.001158.5052
4.251089.0048.8
4.501009.5046.0
4.759610.0043.5
5.009110.5041.3

Force and Shrink Limits and Fits For Cylindirical Parts [(ANSI B4.1-1967,R1987)]


All limits shown in chart below are in thousandths of an inches. Symbols H6,H7,s6, etc. are Shaft and Hole designations used in American-British-Canadian System (ABC). Limits for Shaft and Hole are applied algebraically to the Nominal (basic) size to obtain the limits of the size for the parts. All data given in bold in the chart below are in accordance with ABC agreements. The values given under the "Clearance Limits Column" represent min and max amounts of clearance resulting from application of standard tolerance limits.


VALUES SHOWN BELOW ARE IN THOUSANDTHS OF AN INCHES
Nominal (Basic) Size
Renges (Inches)
Class FN1 Class FN2 Class FN3Class FN4Class FN5
I
n
t
e
r
f
e
r
e
n
c
e
Limits
Standard Tolerance Limits I
n
t
e
r
f
e
r
e
n
c
e
Limits
Standard Tolerance Limits I
n
t
e
r
f
e
r
e
n
c
e
Limits
Standard Tolerance Limits I
n
t
e
r
f
e
r
e
n
c
e
Limits
Standard Tolerance Limits I
n
t
e
r
f
e
r
e
n
c
e
Limits
Standard Tolerance Limits
OverToHole
H6
Shaft
Hole
H7
Shaft
s6
Hole
H7
Shaft
t6
Hole
H7
Shaft
u6
Hole
H8
Shaft
x7
00.120.05
0.5
+0.25
0
+0.5
+0.3
0.2
0.85
+0.4
0
+0.85
+0.6
0.3
0.95
+.04
0
+0.95
+0.7
0.3
1.3
+0.6
0
+1.3
+0.9
0.120.240.1
0.6
+0.3
0
+0.6
+0.4
0.2
0.1
+0.5
0
+1.0
+0.7
0.4
1.2
+0.5
0
+1.2
+0.9
0.5
1.7
+0.7
0
+1.7
+1.2
0.240.400.1
0.75
+0.4
0
+0.75
+0.5
0.4
1.4
+0.6
0
+1.4
+1.0
0.6
1.6
+0.6
0
+1.6
+1.2
0.5
2.0
+0.9
0
+2.0
+1.4
0.400.560.1
0.8
+0.4
0
+0.8
+0.5
0.5
1.6
+0.7
0
+1.6
+1.2
0.7
1.8
+0.7
0
+1.8
+1.4
0.6
2.3
+1.0
0
+2.3
+1.6
0.560.710.2
0.9
+0.4
0
+0.9
+0.6
0.5
1.6
+0.7
0
+1.6
+1.2
0.7
1.8
+0.7
0
+1.8
+1.4
0.8
2.5
+1.0
0
+2.5
+1.8
0.710.950.2
1.1
+0.5
0
+1.1
+0.7
.06
1.9
+0.8
0
+1.9
+1.4
0.8
2.1
+0.8
+2.1
+1.6
1.0
3.0
+1.2
0
+3.0
+2.2
0.951.190.3
1.2
+0.5
0
+1.2
+0.8
0.6
1.9
+0.8
0
+1.9
+1.4
0.8
2.1
+0.8
0
+2.1
+1.6
1.0
2.3
+0.8
0
+2.3
+1.8
1.3
3.3
+1.2
0
+3.3
+2.5
1.191.580.3
1.3
+0.6
0
+1.3
+0.9
0.8
2.4
+1.0
0
+2.4
+1.8
1.0
2.6
+1.0
0
+2.6
+2.0
1.5
3.1
+1.0
0
+3.1
+2.5
1.4
4.0
+1.6
0
+4.0
+3.0
1.581.970.4
1.4
+0.6
0
+1.4
+1.0
0.8
2.4
+1.0
0
+2.4
+1.8
1.2
2.8
+1.0
0
+2.8
+2.2
1.8
3.4
+1.0
+3.4
+2.8
2.4
5.0
+1.6
+5.0
+4.0
1.972.560.6
1.8
+0.7
0
+1.8
+1.3
0.8
2.7
+1.2
0
+2.7
+2.0
1.3
3.2
+1.2
0
+3.2
+2.5
2.3
4.2
+1.2
0
+4.2
+3.5
3.2
6.2
+1.8
0
+6.2
+5.0
2.563.150.7
1.9
+0.7
0
+1.9
+1.4
1.0
2.9
+1.2
0
+2.9
+2.2
1.8
3.7
+1.2
0
+3.7
+3.0
2.8
4.7
+1.
0
+4.7
+4.0
4.2
7.2
+1.8
0
+7.2
+6.0
3.153.940.9
2.4
+0.9
0
+2.4
+1.8
1.4
3.7
+1.4
0
+3.7
+2.8
2.1
4.4
+1.4
0
+4.4
+3.5
3.6
5.9
+1.4
0
+5.9
+5.0
4.8
8.4
+2.2
0
+8.4
-7.0
3.944.731.1
2.6
+0.9
0
+2.6
+2.0
1.6
3.9
+1.
0
+3.9
+3.0
2.6
4.9
+1.4
0
+4.9
4.0
4.6
6.9
+1.4
0
+6.9
+8.0
5.8
9.4
+2.2
0
+9.4
+8.0
4.735.521.2
2.9
+1.0
0
+2.9
+2.2
1.9
4.5
+1.6
0
+4.5
+3.5
3.4
6.0
+1.6
0
+6.0
+5.0
5.4
8.0
+1.6
0
+8.0
+7.0
7.5
11.6
+2.5
0
+11.6
+10.0
5.526.301.5
3.2
+1.0
0
+3.2
+2.5
2.4
5.0
+1.6
0
+5.0
+4.0
3.4
6.0
+1.6
0
+6.0
+5.0
5.4
8.0
+1.6
0
+8.0
+7.0
8.5
13.6
+2.5
0
+13.6
+12.0
6.307.091.8
3.5
+1.0
0
+3.5
+2.8
2.9
5.5
+1.6
0
+5.5
+4.5
4.4
7.0
+1.6
0
+7.0
+8.0
6.4
9.0
+1.6
0
+9.0
+8.0
9.5
13.6
+2.5
0
+13.6
+12.0
7.097.881.8
3.8
+1.2
0
+3.8
+3.0
3.2
6.2
+1.8
0
+6.2
+5.0
5.2
8.2
+1.8
0
+8.2
+7.0
7.2
10.2
+1.8
0
+10.2
+9.0
112.2
15.8
+2.8
0
+15.8
+14.0
7.888.862.3
4.3
+1.2
0
+4.3
+3.5
3.2
6.2
+1.8
0
+6.2
+5.0
5.2
8.2
+1.8
0
+8.2
+7.0
8.2
11.2
+1.8
0
+11.2
+10.0
13.2
17.8
+2.8
0
+17.8
+16.0
8.869.852.3
4.3
+1.2
0
+4.3
+3.5
4.2
7.2
+1.8
0
+7.2
+6.0
6.2
9.2
+1.8
0
+9.2
+8.0
10.2
13.2
+1.8
0
+13.2
+12.0
13.2
17.8
+2.8
0
+17.8
+16.0
9.8511.032.8
4.9
+1.2
0
+4.9
+4.0
4.0
7.2
+2.0
0
+7.2
+6.0
7.0
10.2
+2.0
0
+10.2
+9.0
10.0
13.2
+2.0
0
+13.2
+12.0
15.0
20.0
+3.0
0
+20.0
+18.0
11.0312.412.8
4.9
+1.2
0
+4.9
+4.0
5.0
8.2
+2.0
0
+8.2
+7.0
7.0
10.2
+2.0
0
+10.2
+9.0
12.0
15.2
+2.0
0
+15.2
+14.0
17.0
22.0
+3.0
0
+22.0
+20.0
12.4113.983.1
5.5
+1.4
0
+5.5
+4.5
5.8
9.4
+2.2
0
+9.4
+8.0
7.8
11.4
+2.2
0
+11.4
+10.0
13.8
17.4
+2.2
0
+17.4
+16.0
18.5
24.2
+3.5
0
+24.2
+22.0
13.9815.753.6
6.1
+1.4
0
+6.1
+5.0
5.8
9.4
+2.2
0
+9.4
8.0
9.8
13.4
+2.2
0
+13.4
+12.0
15.8
19.4
+2.2
0
+19.4
+18.0
21.5
27.2
+3.5
0
+27.2
+25.0
15.7517.724.4
7.0
+1.6
0
+7.0
+6.0
6.5
10.6
+2.5
0
+10.6
+9.0
9.5
13.6
+2.5
0
+13.6
+12.0
7.5
21.6
+2.5
0
+21.6
+20.0
24.0
30.5
+4.0
0
+30.5
+28.0
17.7219.694.4
7.0
+1.6
0
+7.0
+6.0
7.5
11.6
+2.5
0
+11.6
+10.0
11.5
15.6
+2.5
0
+15.6
+14.0
19.5
23.6
+2.5
0
+23.6
+22.0
26.0
32.5
+4.0
0
+32.5
+30.0
19.6924.346.0
9.2
+2.0
0
+9.2
+8.0
9.0
14.0
+3.0
0
+14.0
+12.0
15.0
20.0
+3.0
+20.0
+18.0
22.0
27.0
+3.0
0
+27.0
+25.0
30.0
38.0
+5.0
0
+38.0
+35.0
24.3430.097.0
10.2
+2.0
0
+10.2
+9.0
11.0
16.0
+3.0
0
+16.0
+14.0
17.0
22.0
+3.0
+22.0
+20.0
27.0
32.0
+3.0
0
+32.0
+30.0
35.0
43.0
+5.0
0
+43.0
+40.0
30.0935.477.5
11.6
+2.5
0
+11.6
+10.0
14.0
20.5
+4.0
+20.5
+18.0
21.0
27.5
+4.0
0
+27.5
+25.0
31.0
37.5
+4.0
0
+37.5
+35.0
44.0
54.0
+6.0
0
+54.0
+50.0
35.4741.499.5
13.6
+2.5
0
+13.6
+12.0
16.0
22.5
+4.0
0
+22.5
+20.0
24.0
30.5
+4.0
0
+30.5
+28.0
36.0
43.5
+4.0
0
+43.5
+40.0
54.0
64.0
+6.0
0
+64.0
+60.0
41..4948.2811.0
16.0
+3.0
0
+16.0
+14.0
17.0
25.0
+5.0
0
+25.0
+22.0
30.0
38.0
+5.0
0
+38.0
+35.0
45.0
53.0
+5.0
0
+53.0
+50.0
62.0
75.0
+8.0
0
+75.0
+70.0
48.2856.1913.0
18.0
+3.0
0
+18.0
+16.0
20.0
28.0
+5.0
0
+28.0
+25.0
35.0
43.0
+5.0
0
+43.0
+40.0
55.0
63.0
+5.0
0
+63.0
+60.0
72.0
85.0
+8.0
0
+85.0
+80.0
56.1965.5414.0
20.5
+4.0
0
+20.5
+18.0
24.0
34.0
+6.0
0
+34.0
+30.0
39.0
49.0
+6.0
0
+49.0
+45.0
64.0
74.0
+6.0
0
+74.0
70.0
90.0
106.0
+10.0
0
+106.0
+100.0
65.5476.3918.0
24.5
+4.0
0
+24.5
+22.0
29.0
39.0
+6.0
0
+39.0
+35.0
44.0
54.0
+6.0
0
+54.0
+50.0
74.0
84.0
+6.0
0
+84.0
+80.0
110
126
+10.0
0
+126.0
+120.0
76.3987.7920.0
28.0
+5.0
0
+28.0
+25.0
32.0
45.0
+8.0
0
+45.0
+40.0
52.0
65.0
+8.0
0
+65.0
+60.0
82.0
95.0
+8.0
0
+95.0
+90.0
128
148
+12.0
0
+148.0
+140.0
87.79100.923.0
31.0
+5.0
0
+31.0
+28.0
37.0
50.0
+8.0
0
+50.0
+45.0
62.0
75.0
+8.0
0
+75.0
+70.0
92.0
105
+8.0
0
+105
+100
148
168
+12.0
0
+168.0
+160.0
100.9115.324.0
34.0
+6.0
0
+34.0
+30.0
40.0
56.0
+10.0
0
+56.0
+50.0
70.0
86.0
+10.0
0
+86.0
+80.0
110
126
+10.0
0
+126
+120
164
190
+16.0
0
+190.0
+180.0
115.3131.929.0
39.0
+6.0
0
+39.0
+35.0
50.0
66.0
+10.0
0
+66.0
+60.0
80.0
96.0
+10.0
0
+96.0
+90.0
130
146
+10.0
0
+146
+140
184
210
+16.0
0
+210.0
+200.0
131.9152.237.0
50.0
+8.0
0
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+45.0
58.0
78.0
+12.0
0
+78.0
+70.0
88.0
108
+12.0
0
+108
+100
148
168
+12.0
0
+168
+160
200
232
+20.0
0
+232.0
+220.0
152.2171.942.0
55.0
+8.0
0
+55.0
+50.0
68.0
88.0
+12.0
0
+88.0
+80.0
108
128
+12.0
0
+128
+120
168
188
+12.0
0
+188
+180
230
262
+20.0
0
+262.0
+250.0
171.920050.0
66.0
+10.0
0
+66.0
+60.0
74.0
100
+16.0
0
+100
+90
124
150
+16.0
0
+150
+140
184
210
+16.0
0
+210
+200
275
316
+25.0
0
+316.0
+300.0

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