Machinery's Handbook, 31st Edition
1884
Dowel Pins Table 3. American National Standard Unhardened Ground Dowel Pins ANSI/ASME B18.8.2-2000 (R2010) L 25°
C
A
Contour of chamfer surface optional
Double Shear Load Min., lb.
Pin Diameter, A
Chamfer Length, C
Suggested Hole Diameter c
Range of Preferred Lengths, b L
Nominal Size a or Basic Pin Diameter
Carbon Steel
Max. Min.
Max. Min.
Max.
Min.
Brass
0.0595 0.0580
350
220
1 ∕ 16 0.0625 0.0600 0.0595 0.025 0.005
1 ∕ 4 -1
3 ∕ 32 0.0938 0.0912 0.0907 0.025 0.005
0.0907 0.0892
820
510
1 ∕ 4 -1 1 ∕ 2
d7 ∕ 64 0.1094 0.1068 0.1063 0.025 0.005
… 0.1062 0.1047 1,130
710
0.1217 0.1202 1,490
930
1 ∕ 8 0.1250 0.1223 0.1218 0.025 0.005
1 ∕ 4 -2
0.1528 0.1513 2,350 1,470
5 ∕ 32 0.1562 0.1535 0.1530 0.025 0.005
1 ∕ 4 -2
0.1840 0.1825 3,410 2,130
3 ∕ 16 0.1875 0.1847 0.1842 0.025 0.005
1 ∕ 4 -2
0.2151 0.2136 4,660 2,910
7 ∕ 32 0.2188 0.2159 0.2154 0.025 0.005
1 ∕ 4 -2
1 ∕ 4 -1 1 ∕ 2 , 1 3 ∕ 4 , 2-2 1 ∕ 2 5 ∕ 16 -1 1 ∕ 2 , 1 3 ∕ 4 , 2-2 1 ∕ 2 3 ∕ 8 -1 1 ∕ 2 , 1 3 ∕ 4 , 2-2 1 ∕ 2
1 ∕ 4 0.2500 0.2470 0.2465 0.025 0.005
0.2462 0.2447 6,120 3,810
5 ∕ 16 0.3125 0.3094 0.3089 0.040 0.020
0.3085 0.3070 9,590 5,990
3 ∕ 8 0.3750 0.3717 0.3712 0.040 0.020
0.3708 0.3693 13,850 8,650
7 ∕ 16 - 5 ∕ 8 , 3 ∕ 4 , 7 ∕ 8 -1 1 ∕ 2 , 1 3 ∕ 4 , 2-2 1 ∕ 2
7 ∕ 16 0.4375 0.4341 0.4336 0.040 0.020
0.4331 0.4316 18,900 11,810
1 ∕ 2 , 5 ∕ 8 , 3 ∕ 4 , 7 ∕ 8 , 1-1 1 ∕ 2 , 1 3 ∕ 4 , 2-3 0.4954 0.4939 24,720 15,450
1 ∕ 2 0.5000 0.4964 0.4959 0.040 0.020
5 ∕ 8 , 3 ∕ 4 , 7 ∕ 8 , 1-1 1 ∕ 2 , 1 3 ∕ 4 , 2, 2 1 ∕ 2 -4
5 ∕ 8 0.6250 0.6211 0.6206 0.055 0.035
0.6200 0.6185 38,710 24,190
3 ∕ 4 , 7 ∕ 8 , 1, 1 1 ∕ 4 , 1 1 ∕ 2 , 1 3 ∕ 4 , 2, 2 1 ∕ 2 -4 0.7446 0.7431 55,840 34,900
3 ∕ 4 0.7500 0.7458 0.7453 0.055 0.035
7 ∕ 8 , 1, 1 1 ∕ 4 , 1 1 ∕ 2 , 1 3 ∕ 4 , 2, 2 1 ∕ 2 -4
7 ∕ 8 0.8750 0.8705 0.8700 0.070 0.050
0.8692 0.8677 76,090 47,550
1 1.0000 0.9952 0.9947 0.070 0.050 1, 1 1 ∕ 4 , 1 1 ∕ 2 , 1 3 ∕ 4 , 2, 2 1 ∕ 2 -4 0.9938 0.9923 99,460 62,160 a Where specifying pin size in decimals, zeros preceding decimal and in the fourth decimal place are omitted. b Lengths increase in 1 ⁄ 16 -inch increments from 1 ⁄ 4 to 1 inch, in 1 ⁄ 8 -inch increments from 1 inch to 2 inches, and in 1 ⁄ 4 -inch increments from 2 to 2 1 ⁄ 2 inches, and in 1 ⁄ 2 -inch increments from 2 1 ⁄ 2 to 4 inches. c These hole sizes have been found to be satisfactory for press fitting pins into mild steel and cast and malleable irons. In soft materials such as aluminum alloys or zinc die castings, hole size limits
are usually decreased by 0.0005 inch to increase the press fit. d Nonpreferred size, not recommended for use in new designs. All dimensions are in inches.
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