DOWEL PIN SIZES CHART

Dowel pin sizes for inch size hardened ground machine dowel pins according to ASME B18.8.2. Standard series have basic diameters 0.0002 in. over the nominal diameter, intended for initial installations. Oversize Series have basic diameters 0.001 in. over the nominal diameter, intended for replacement use.

Dowel Pin Sizes

All dimensions are given in inches.

Nominal
Size		 Nominal
Pin
Dia.		 Pin Diameter (A) Point
Diameter
(B)		 Crown
Height
(C)		 Crown
Radius
(R)
Standard Series Oversize Series Max. Min. Max. Min.
Basic Max. Min. Basic. Max. Min.
1/16 0.0625 0.0627 0.0628 0.0626 0.0635 0.0636 0.0634 0.058 0.048 0.020 0.008
5/64 0.0781 0.0783 0.0784 0.0782 0.0791 0.0792 0.0790 0.074 0.064 0.026 0.010
3/32 0.0938 0.0940 0.0941 0.0939 0.0948 0.0949 0.0947 0.089 0.079 0.031 0.012
1/8 0.1250 0.1252 0.1253 0.1251 0.1260 0.1261 0.1259 0.120 0.110 0.041 0.016
5/32 0.1562 0.1564 0.1565 0.1563 0.1572 0.1573 0.1571 0.150 0.140 0.052 0.020
3/16 0.1875 0.1877 0.1878 0.1876 0.1885 0.1886 0.1884 0.180 0.170 0.062 0.023
1/4 0.2500 0.2502 0.2503 0.2501 0.2510 0.2511 0.2509 0.240 0.230 0.083 0.031
Nominal
Size		 Nominal
Pin
Dia.		 Pin Diameter (A) Point
Diameter
(B)		 Crown
Height
(C)		 Crown
Radius
(R)
Standard Series Oversize Series Max. Min. Max. Min.
Basic Max. Min. Basic. Max. Min.
5/16 0.3125 0.3127 0.3128 0.3126 0.3135 0.3136 0.3134 0.302 0.290 0.104 0.039
3/8 0.3750 0.3752 0.3753 0.3751 0.3760 0.3761 0.3759 0.365 0.350 0.125 0.047
7/16 0.4375 0.4377 0.4378 0.4376 0.4385 0.4386 0.4384 0.424 0.409 0.146 0.055
1/2 0.5000 0.5002 0.5003 0.5001 0.5010 0.5011 0.5009 0.486 0.471 0.167 0.063
5/8 0.6250 0.6252 0.6253 0.6251 0.6260 0.6261 0.6259 0.611 0.595 0.208 0.078
3/4 0.7500 0.7502 0.7503 0.7501 0.7510 0.7511 0.7509 0.735 0.715 0.250 0.094
7/8 0.8750 0.8752 0.8753 0.8751 0.8760 0.8761 0.8759 0.860 0.840 0.293 0.109
1 1.0000 1.0002 1.0003 1.0001 1.0010 1.0011 1.0009 0.980 0.960 0.333 0.125

Preferred sizes and lengths of hardened ground machine dowel pins are given in the following table.

Nominal Length Nominal Size
1/16 3/32 1/8 3/16 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1
3/16                          
1/4                          
5/16                          
3/8                          
1/2                          
5/8                          
3/4                          
7/8                          
1                          
1 1/4                          
1 1/2                          
1 3/4                          
2                          
2 1/4                          
2 1/2                          
3                          
3 1/2                          
4                          
4 1/2                          
5                          
5 1/2                          
6                          

Supplements:

Reference:

  • ASME B18.8.2-2000, Taper Pins, Dowel Pins, Straight Pins, Grooved Pins, and Spring Pins(Inch Series)
  • Oberg.E , Jones.D.J., Holbrook L.H, Ryffel H.H., (2012) . Machinery's Handbook. 29th edition.  Industrial Press Inc. , pp 1749
  • Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) . Machinery's Handbook . 30th edition.  Industrial Press Inc. , pp 1800