ASME B18.3:2003 pdf download

ASME B18.3:2003 pdf download.Socket Cap, Shoulder, and Set Screws, Hex and Spline Keys (Inch Series)
1.1 Scope
1.1.1 This Standard covers complete general and dimensional data for various types of hexagon and spline (fluted) socket cap screws, shoulder screws, set screws, and hexagon and spline keys recognized as an American National Standard. Also, included are appen- dices that provide specifications for hexagon and spline socket gages and gaging, tables showing applicability of keys and bits to various socket screws types and sizes, drill and counterbore sizes for socket head cap screws, and formulas on which dimensional data are based. However, where questions arise concerning acceptance of product, the dimensions in the tables shall govern over recalculation by formula. 1.1.2 The inclusion of dimensional data in this Stan- dard is not intended to imply that all of the products described are stock production sizes. Consumers should consultwithmanufacturers concerninglists ofstockpro- duction sizes.
1.2 Socket Cap Screws
The head types covered by this Standard are specified in paras. 1.2.1 through 1.2.5. 1.2.1 Socket Head Cap Screws. The socket head shall have a flat chamfered top surface with smooth or knurled cylindrical sides and a flatbearingsurface. Spec- ifications are given in Tables 1A through 1F. Both hexa- gon and spline socket types are included. Dimensions for drilled holes and counterbores are included in Table A-1 of Nonmandatory Appendix A. 1.2.2 Drilled Hexagon Socket Head Cap Screws. Speci- fications for hexagon socket head cap screws having two, four, and six holes drilled in the head for lock wire application are given in Table 1F. 1.2.3 Socket Flat Countersunk Head Cap Screws. The flat countersunk head shall have a flat top surface and a conical bearingsurface with included angle ofapproxi- mately 82 deg. Specifications are given in Tables 2A, 2B, and 2C. Both hexagon and spline socket types are included. 1.2.4 Socket Button Head Cap Screws. The button head shall have a low rounded top surface with a large flat bearing surface. Specifications are given in Table 3. Both hexagon and spline socket types are included.1.2.5 Socket Low Head Cap Screws. These are similar to socket head cap screws, except they have reduced head height and a smaller socket size. They are designed to be used in applications where height clearance is a problem. Specifications are given in Table 1G. Spline socket types are excluded.
2 GENERAL DATA
2.1 Sockets In accordance withthe provisions setforth in the notes to the respective dimensional tables, screws shall have hexagon or spline sockets as designated by the pur- chaser. Gages and gaging procedures are included in Manda- tory Appendix I. For coated products, use GO gages identical in design and tolerances to those shown in Mandatory Appendix I, excepthaving minimum dimen- sions equal to minimum sizes of keys and bits shown in Tables 8 and 9, respectively. Due to possible buildup ofthe socket, coated products may not accept a standard hex or spline key. 2.1.1 Hexagon Sockets. Hexagon sockets shall con- form with the specifications given in Table 6. 2.1.2 Spline Sockets. Spline sockets shall conform with the specifications given in Table 7. 2.2 Threads Threads on all screw products covered by this Stan- dard shall be in accordance with ASME B1.1 for the series and class specified in the notes to the respective product dimensional tables. Acceptability of screw threads shall be based on Sys- tem 22, ASME B1.1, except where otherwise specified in Note (14) of Table 5A. 2.3 Quality Assurance Products will be furnished in accordance with ASME B18.18.1M, with the thread acceptability to Inspection Level C, unless otherwise specified. 2.4 Dimensional Characteristics Products shall conform to the dimensions indicated in the respective tables. The designated characteristics defined within the notes of each product table shall be inspected in accordance with ASME B18.18.2M. For nondesignated dimensional characteristics, the provi- sions of ASME B18.18.1M shall apply. Should a nondes- ignated dimension be determined to have a variance, it shall be deemed conforming to this Standard if the user, who is the installer, accepts the variance based on fit, form, and function considerations.