Machinery's Handbook, 31st Edition
GROOVED PINS 1891 Materials: Grooved pins are normally made from cold drawn low carbon steel wire or rod. Where additional performance is required, carbon steel pins may be supplied surface hardened and heat treated to a hardness consistent with the performance requirements. Pins may also be made from alloy steel, corrosion resistant steel, brass, Monel and other nonferrous metals having chemical properties as agreed upon between manufacturer and purchaser. Performance Requirements: Grooved pins are required to withstand the minimum dou ble shear loads given in Table 7 for the respective materials shown, when tested in accor dance with the Double Shear Testing of Pins as set forth in ANSI/ASME B18.8.2-2000 (R2010), Appendix B. Hole Sizes: To obtain maximum product retention under average conditions, it is recom mended that holes for the installation of grooved pins be held as close as possible to the limits shown in Table 7 . The minimum limits correspond to the drill size, which is the same as the basic pin diameter. The maximum limits are generally suitable for length- diameter ratios of not less than 4 to 1 nor greater than 10 to 1. For smaller length-to- diameter ratios, the hole should be held closer to the minimum limits where retention is critical. Conversely for larger ratios where retention requirements are less important, it may be desirable to increase the hole diameters beyond the maximum limits shown. Designation: Grooved pins are designated by the following data in the sequence shown: Product name (noun first) including type designation, nominal size (number, fraction or decimal equivalent), length (fraction or decimal equivalent), material, including specification or heat treatment where necessary, protective finish, if required. Examples: Pin, Type A Grooved, 3 ∕ 32 × 3 ∕ 4 , Steel, Zinc Plated Pin, Type F Grooved, 0.250 × 1.500, Corrosion Resistant Steel American National Standard Grooved T-Head Cotter Pins and Round Head Grooved Drive Studs.— The cotter pins have a T-head and the studs a round head. Both pins and studs have three equally spaced longitudinal grooves and an expanded diameter over the crests of the raised ridges formed by the material displaced when the grooves are formed. Standard Sizes and Lengths: The standard sizes and range of standard lengths are given in Table 8 and Table 9. Material: Unless otherwise specified these pins are made from low carbon steel. Where so indicated by the purchaser they may be made from corrosion resistant steel, brass or other nonferrous alloys. Hole Sizes: To obtain optimum product retention under average conditions, it is recom mended that holes for the installation of grooved T-head cotter pins and grooved drive studs be held as close as possible to the limits tabulated. The minimum limits given corre spond to the drill size, which is equivalent to the basic shank diameter. The maximum limits shown are generally suitable for length-diameter ratios of not less than 4 to 1 and not greater than 10 to 1. For smaller length-to-diameter ratios, the holes should be held closer to minimum limits where retention is critical. Conversely, for larger length-to-diameter ratios or where retention requirements are not essential, it may be desirable to increase the hole diameter beyond the maximum limits shown. Designation: Grooved T-head cotter pins and round head grooved drive studs are desig nated by the following data, in the order shown: Product name (noun first), nominal size (number, fraction or decimal equivalent), length (fraction or decimal equivalent), material including specification or heat treatment where necessary, and protective finish, if required. Examples: Pin, Grooved T-Head Cotter, 1 ∕ 4 × 1 1 ∕ 4 , Steel, Zinc Plated Drive Stud, Round Head Grooved, No. 10 × 1 ∕ 2 , Corrosion Resistant Steel
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