Machinery's Handbook, 31st Edition
Dowel Pins 1881 American National Standard Hardened Ground Machine Dowel Pins.— Hardened ground machine dowel pins are furnished in two diameter series: Standard Series having basic diameters 0.0002 inch over the nominal diameter, intended for initial installations; and Oversize Series having basic diameters 0.001 inch over the nominal diameter, in - tended for replacement use. Preferred Lengths and Sizes: The preferred lengths and sizes in which these pins are normally available are given in Table 1 . Other sizes and lengths are produced as required by the purchaser. Effective Length: The effective length, L e , must not be less than 75 percent of the overall length of the pin. Shear Strength: Single shear strength values are listed in Table 1 . Prior versions of ANSI/ ASME B18.8.2-2000 (R2010) had listed double shear load minimum values and had specified a minimum single shear strength of 130,000 psi. See ANSI/ASME B18.8.2- 2000 (R2010), Appendix B for a description of the double shear test. Designation: These pins are designated by the following data in the sequence shown: Product name (noun first), including pin series, nominal pin diameter (fraction or decimal equivalent), length (fraction or decimal equivalent), material, and protective finish, if required. Examples: Pins, Hardened Ground Machine Dowel.—Standard Series, 3 ∕ 8 × 1 1 ∕ 2 , Steel, Phosphate Coated. Pins, Hardened Ground Machine Dowel.—Oversize Series, 0.625 × 2.500, Steel Installation Precaution: Pins should not be installed by striking or hammering and when installing with a press, a shield should be used and safety glasses worn. American National Standard Hardened Ground Production Dowel Pins.— Hardened ground production dowel pins have basic diameters that are 0.0002 inch over the nominal pin diameter. Preferred Lengths and Sizes: The preferred lengths and sizes in which these pins are available are given in Table 2 . Other sizes and lengths are produced as required by the purchaser. Shear Strength: Single shear strength values are listed in Table 2 . Prior versions of ANSI/ ASME B18.8.2-2000 (R2010) had listed double shear load minimum values and had specified a minimum single shear strength of 102,000 psi. See ANSI/ASME B18.8.2- 2000 (R2010), Appendix B for a description of the double shear test. Ductility: These standard pins are sufficiently ductile to withstand being pressed into holes 0.0005 inch smaller than the nominal pin diameter in hardened steel without crack ing or shattering. Designation: These pins are designated by the following data in the sequence shown: Product name (noun first), nominal pin diameter (fraction or decimal equivalent), length (fraction or decimal equivalent), material, and protective finish, if required. Examples: Pins, Hardened Ground Production Dowel, 1 ∕ 8 × 3 ∕ 4 , Steel, Phosphate Coated Pins, Hardened Ground Production Dowel, 0.375 × 1.500, Steel
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