Machinery's Handbook, 31st Edition
Dowel Pins 1883 Table 2. American National Standard Hardened Ground Production Dowel Pins ANSI/ASME B18.8.2-2000 (R2010)
L
A
R
R
Suggested Hole Diameter c
Nominal Size a or Nominal Pin Diameter
Single Shear Load, Calculated, lb
Pin Diameter, A
Corner Radius, R
Range of Preferred Lengths, b L
Basic Max.
Min.
Max.
Min.
Max.
Min.
1 ∕ 16 0.0625 0.0627 0.0628 0.0626 0.020 0.010 3 ∕ 32 0.0938 0.0939 0.0940 0.0938 0.020 0.010 7 ∕ 64 0.1094 0.1095 0.1096 0.1094 0.020 0.010 1 ∕ 8 0.1250 0.1252 0.1253 0.1251 0.020 0.010 5 ∕ 32 0.1562 0.1564 0.1565 0.1563 0.020 0.010 3 ∕ 16 0.1875 0.1877 0.1878 0.1876 0.020 0.010 7 ∕ 32 0.2188 0.2189 0.2190 0.2188 0.020 0.010
395 0.0625 0.0620 700 0.0937 0.0932 950 0.1094 0.1089 1,300 0.1250 0.1245 2,050 0.1562 0.1557 2,950 0.1875 0.1870 3,800 0.2188 0.2183 5,000 0.2500 0.2495 8,000 0.3125 0.3120
3 ∕ 16-1 3 ∕ 16 -2 3 ∕ 16 -2 3 ∕ 16 -2 3 ∕ 16 -2 3 ∕ 16 -2
1 ∕ 4 -2
1 ∕ 4 0.2500 0.2502 0.2503 0.2501 0.020 0.010 1 ∕ 4 -1 1 ∕ 2 , 1 3 ∕ 4 , 2-2 1 ∕ 2 5 ∕ 16 0.3125 0.3127 0.3128 0.3126 0.020 0.010 5 ∕ 16 -1 1 ∕ 2 , 1 3 ∕ 4 , 2-2 1 ∕ 2
3 ∕ 8 0.3750 0.3752 0.3753 0.3751 0.020 0.010 11,500 0.3750 0.3745 a Where specifying nominal pin size in decimals, zeros preceding decimal and in the fourth decimal place are omitted. b Lengths increase in 1 ⁄ 16 -inch steps up to 1 inch, in 1 ⁄ 8 -inch steps from 1 inch to 2 inches; and then are 2 1 ⁄ 4 , 2 1 ⁄ 2 , and 3 inches. 3 ∕ 8 -1 1 ∕ 2 , 1 3 ∕ 4 , 2-3 c These hole sizes have been commonly used for press fitting production dowel pins into materials such as mild steels and cast iron. In soft materials such as aluminum or zinc die castings, hole size limits are usually decreased by 0.0005 inch to increase the press fit. All dimensions are in inches. American National Standard Unhardened Ground Dowel Pins.— Unhardened ground dowel pins are normally produced by grinding the outside diameter of commercial wire or rod material to size. Consequently, the maximum diameters of the pins, as specified in Table 3 , are below the minimum commercial stock sizes by graduated amounts from 0.0005 inch on the 1 ∕ 16 -inch nominal pin size to 0.0028 inch on the 1-inch nominal pin size. Preferred Lengths and Sizes: The preferred lengths and sizes in which unhardened ground pins are normally available are given in Table 3 . Other sizes and lengths are pro duced as required by the purchaser. Shear Strength: These pins must have a single shear strength of 64,000 psi minimum for pins made from steel and 40,000 psi minimum for pins made from brass and must be capa ble of withstanding the minimum double shear loads given in Table 3 when tested in accor dance with the procedure outlined in ANSI/ASME B18.8.2-2000 (R2010), Appendix B. Designation: These pins are designated by the following data in the order shown: Prod uct name (noun first), nominal pin diameter (fraction or decimal equivalent), length (frac tion or decimal equivalent), material, and protective finish, if required. Examples: Pins, Unhardened Ground Dowel, 1 ∕ 8 × 3 ∕ 4 , Steel Pins, Unhardened Ground Dowel, 0.250 × 2.500, Steel, Zinc Plated
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