ASME B18.3 pdf download Socket Cap, Shoulder, and Set Screws, Hex and Spline Keys (Inch Series)
1 INTRODUCTORY NOTES
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.
1.3 Socket Head Shoulder Screws The socket head shoulder screw is a hexagon socket head screw having a cylindrical shoulder under the head. Specifications are given in Table 4.