ASME B18.8.2:2020 pdf free download – Taper Pins, Dowel Pins,Straight Pins, Grooved Pins, and Spring Pins(Inch Series)
1.1 Scope
1.1.1 This Standard covers the dimensional andgeneral data for taper pins, dowel pins, straight pins.grooved pins,and spring pins.Also included are appen-dices providing supplementary information for the dril-ling of holes for taper pins and the testing of pins in doubleshear.
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. consumersshould consult with manufacturers concerning lists of stock production sizes.
1.2 Comparison With ISo Standards
Since these are inch fastener standards. there are nocomparable 1SO standards.
1.3 Dimensions
Unless otherwise specified,all dimensions are in inches.All dimensions shall apply before coating. Symbols speci-fying geometric characteristics are in accord with ASMEY14.5.
1.4 Options
Where specified, options shall be at the discretion of themanufacturer unless otherwise agreed upon by the manu-facturer and purchaser. Special materials, coatings,lubri-cation, or packaging requirements shall be specified by thepurchaser.
1.5 Terminology
For definitions of terminology not specified in this Stan-dard,refer to ASME B18.12.
1.6 Referenced Standards
The following is a list of publications referenced in thisStandard.The latest edition shall be used.
ASME B18.8.1,Clevis Pins and Cotter Pins (Inch Series)ASMEB18.12,Glossary ofTerms for Mechanical FastenersASME B18.18.Quality Assurance for Fasteners
2.1 Types of Pins
2.1.1 Taper Pins.Taper pins shall have a uniform taperover the pin length with both ends crowned. Mostsizes aresupplied in both commercial and precision classes. thelatter having generally tighter tolerances and beingmore closely controlled in manufacture. Dimensionsfor both classes are given in Table 3.1.1-1.
2.1.2 Dowel Pins. The following three varieties ofdowel pins are covered.
2.1.2.1 Hardened Ground Machine Dowel Pins. Thisvariety of hardened dowel pins shall have ground cylin-drical sides with one end pointed slightly to enter matingdrive-fit holes and the other end rounded or crowned fordriving purposes.They are available in standard and over-size diameter series to satisfy initial and replacement re-quirements, respectively. Dimensions for both series aregiven in Table 4.1.1-1.
2.1.2.2 Hardened Ground Production Dowel Pins.This variety of hardened dowel pin shall have ground cy-lindrical sides with both ends rounded sufficiently toenable the pin to be pressed into drive-fit holes. Dimen-sions are given in Table 5.1.1-1.
2.1.2.3 Unhardened Ground Dowel Pins.This varietyof dowel pin shall have ground cylindrical sides with bothends chamfered. Dimensions are given in Table 6.1.1-1.2.1.3 Straight Pins. Straight pins shall have unground,straight cylindrical sides with both ends definitely cham-fered on chamfered straight pins and with both endshaving broken corners or being slightly chamfered onsquare end straight pins. Dimensions are given inTable 7.1.1-1.
2.1.4 Grooved Pins.Grooved pins shall have unground,straight cylindrical sides with three or more swaged orextruded grooves equally spaced around the peripheryto displace material beyond the basic pin diameter.Both ends of the pin are normally crowned or chamfered.Several types of grooved pins are available, includingheaded versions, grooved drive studs, and grooved T-head cotter pins, to satisfy various design considerations.Upon installation, the material displaced by the grooves isforced back into the grooves and reacts against the sides ofthe hole to promote retention of the pin or stud. Dimen-sions of the various types of groove pins are given inTables 8.2.1-1 through 8.2.2-2,grooved drive studs areshown in Table 8.2.1-2,and grooved T-head cotterpins are covered in Tables 8.2.1-3 and 8.5.3-3.
2.1.5 Spring Pins. Spring pins shall have straight cylin-drical sides with both ends chamfered. They are availablein two basic types, reflecting slotted construction andcoiled construction, and the latter in standard duty,heavy duty, and light duty series to suit various designrequirements.Slotted-type spring pins having a singlewall and coiled-type spring pins having multiple wallsare formed or wrapped from strip stock to a diameterlarger than basic and hardened in accordance withpara. 9.6. Upon installation the pin diameters contractand the spring reaction against the sides of the holetends to retain the pin. Dimensions of slotted-typespring pins and coiled-type spring pins are given inTables 9.4.4-1 and 9.4.4-2,respectively.