ASME B18.3:2003 pdf download Socket Cap, Shoulder, and Set Screws, Hex and Spline Keys (Inch Series)
1 INTRODUCTORY NOTES
11 Scope
1.1.1 This Standard covers complete general anddimensional data for various types of hexagon andspline (fluted) socket cap screws, shoulder screws, setscrews, and hexagon and spline keys recognized as anAmerican National Standard. Also, included are appen-dices that provide specifications for hexagon and splinesocket gages and gaging, tables showing applicabilityof keys and bits to various socket screws types and sizesdrill and counterbore sizes for socket head cap screwsand formulas on which dimensional data are based.However, where questions arise concerning acceptanceof product, the dimensions in the tables shall governover recalculation by formula.
1.1.2 The inclusion of dimensional data in this Stan-dard is not intended to imply that all of the productsdescribed are stock production sizes.Consumers shouldconsult with manufacturers concerning lists of stock production sizes.
1.2 Socket Cap ScrewsThe head types covered by this Standard are specifiedin paras.1.2.1 through 1.2.5.
1.21 Socket Head Cap Screws. The socket head shallhave a flat chamfered top surface with smooth orknurled cylindrical sides and a flat bearing surface. Specifications are given in Tables 1A through 1F Both hexagon and spline socket types are included.Dimensions for drilled holes and counterbores areincluded in Table A-1 of Nonmandatory Appendix A.
1.2.2 Drilled Hexagon Socket Head Cap Screws.Specifications for hexagon socket head cap screws havingtwo, four, and six holes drilled in the head for lock wireapplication are given in Table 1F
1.2.3 Socket Flat Countersunk Head Cap Screws. Theflat countersunk head shall have a flat top surface anda conical bearing surface with included angle of approxi-mately 82 deg.Specifications are given in Tables 2A2B, and 2C. Both hexagon and spline socket types areincluded.
1.2.4 Socket Button Head Cap Screws. The buttonhead shall have a low rounded top surface with a largeflat bearing surface. Specifications are given in Table 3Both hexagon and spline socket types are included.
1.2.5 Socket Low Head Cap Screws.These are similarto socket head cap screws, except they have reducedhead height and a smaller socket size. They are designedto be used in applications where height clearance is aproblem. Specifications are given in Table 1G. Splinesocket types are excluded.
1.3 Socket Head Shoulder ScrewsThe socket head shoulder screw is a hexagon sockethead screw having a cylindrical shoulder under thehead. Specifications are given in Table 4.
1.4 Socket Set Screws
The socket set screw is a screw threaded the entirelength except for its length of point. The point isdesigned to bear on a mating part. The common pointstyles are cup, flat, oval, cone, and half dog. Specifications for set screws are shown in Tables 5A through 5Cfor both hexagon and spline socket types.
1.5 Keys and Bits for Driving Socket Screws
The tools for driving socket screws are hexagon orspline keys and bits, the specifications for which appearin Tables 8 and 9, respectively.
16 Dimensions
All dimensions in this Standard are given in inchesunless stated otherwise.
All dimensions apply prior to coating unless statedotherwise.
1.7 Finish
Because of the high hardness of these products, it isrecommended that they not be electroplated.
1.8 Identification Marking
Products described in paras. 1.2.1 through 1.2.4 and13 with diameters larger than #10 must be marked withthe identification of the source manufacturer or privatelabel distributor accepting the responsibility for conformance to this Standard. Marking size, type, and locationof marks are at manufacturer’s option. Products shallnot be marked on bearing surface.