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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 FN3 Class 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		 +50.0
+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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