ASME B18.8.2-2020 pdf download

ASME B18.8.2-2020 pdf download.Taper Pins, Dowel Pins, Straight Pins, Grooved Pins, and Spring Pins (Inch Series).
1.1.1 This Standard covers the dimensional and general data for taper pins, dowel pins, straight pins, grooved pins, and spring pins. Also included are appen- dices providing supplementary information for the dril- lingofholes fortaperpins andthe testingofpins indouble shear. 1.1.2 The inclusion of dimensional data in this Stan- dard is not intended to imply that all the products described are stock production sizes. Consumers should consult with manufacturers concerning lists of stock production sizes. 1.2 Comparison With ISO Standards Since these are inch fastener standards, there are no comparable ISO standards. 1.3 Dimensions Unless otherwisespecified, alldimensions areininches. All dimensions shall apply before coating. Symbols speci- fying geometric characteristics are in accord with ASME Y14.5. 1.4 Options Where specified, options shall be atthe discretionofthe manufacturerunless otherwise agreedupon bythe manu- facturer and purchaser. Special materials, coatings, lubri- cation,orpackagingrequirementsshallbespecifiedbythe purchaser. 1.5 Terminology Fordefinitions ofterminologynotspecifiedin this Stan- dard, refer to ASME B18.12. 1.6 Referenced Standards The following is a list ofpublications referenced in this Standard. The latest edition shall be used.
2.1.3 Straight Pins. Straight pins shall have unground, straight cylindrical sides with both ends definitely cham- fered on chamfered straight pins and with both ends having broken corners or being slightly chamfered on square end straight pins. Dimensions are given in Table 7.1.1-1. 2.1.4 Grooved Pins. Groovedpins shallhaveunground, straight cylindrical sides with three or more swaged or extruded grooves equally spaced around the periphery to displace material beyond the basic pin diameter. Both ends ofthe pin are normally crowned or chamfered. Several types of grooved pins are available, including headed versions, grooved drive studs, and grooved T- head cotter pins, to satisfy various design considerations. Upon installation, the material displaced bythe grooves is forcedbackintothegroovesandreactsagainstthesides of the hole to promote retention of the pin or stud. Dimen- sions of the various types of groove pins are given in Tables 8.2.1-1 through 8.2.2-2, grooved drive studs are shown in Table 8.2.1-2, and grooved T-head cotter pins are covered in Tables 8.2.1-3 and 8.5.3-3. 2.1.5 Spring Pins. Springpins shall have straightcylin- drical sides with both ends chamfered. They are available in two basic types, reflecting slotted construction and coiled construction, and the latter in standard duty, heavy duty, and light duty series to suit various design requirements. Slotted-type spring pins having a single wall and coiled-type spring pins having multiple walls are formed or wrapped from strip stock to a diameter larger than basic and hardened in accordance with para. 9.6. Upon installation the pin diameters contract and the spring reaction against the sides of the hole tends to retain the pin. Dimensions of slotted-type spring pins and coiled-type spring pins are given in Tables 9.4.4-1 and 9.4.4-2, respectively.
4.1.1 Size. Hardened ground machine dowel pins are furnished in two diameter series: Standard Series having basic diameters 0.0002 in. over the nominal diameter, intended for initial installations; and Oversize Series having basic diameters 0.001 in. over the nominal diameter, intended for replacement use. For both series, the diameter shall be ground, or ground and lapped, to within ±0.0001 in. of the respective basic diameters, as specified in Table 4.1.1-1. 4.1.2 Roundness. The outer periphery of hardened ground machine dowel pins shall conform to true round about the longitudinal axis of the pin within 0.0001 in., when measured with equipment that will detect a lobed surface. 4.2 Ends 4.2.1 End Contours. The ends of hardened ground machine dowel pins shall be reasonably flat and perpen- dicular to the axis of pin. One end ofpin shall be pointed and the other end crowned to the dimensions specified in Table 4.1.1-1. On the pointed end, the edge formed by the surfaceofpointandtheendofpinmaybeslightlyrounded or broken. 4.2.1.1 Point Concentricity. For pins having nominal lengths equal to four times the basic pin diameter or longer, the concentricity between the diameter of point and the pin diameter shall be such that the minimum length of point on the pin is not less than 0.010 in.