ASME B18.3 pdf free download

ASME B18.3-2012 pdf free download.Socket Cap, Shoulder, Set Screws, and HexKeys (Inch Series).
This Standard covers complete general and dimensional data for various types of hexagon socket cap screws, shoulder screws, set screws, and hexagon keys recognized as an American National Standard. Also included are appendices that provide specifications for hexagon socket gages and gaging, tables showing applicability of keys and bits to various socket screw types and sizes, drill and countcrboiv sizes for socket head cap screws, and formulas used for dimensional data However, where questions arise concerning acceptance of product, the dimensions in the tables shall govern over recalculation by formula, Recess dimensions for Type VI recesses are given in Mandatory Appendix III.
1.2 Socket Cap Screws
The head types covered by this Standard are specified in paras. 1.11 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 flat bearing surface. Specifications are given in Tables 1 through 7. Dimensions for drilled holes and counterbores are included in Table A-I of Nonmindatory Appendix A.
1.2.2 Drilled Hexagon Socket Head Cap Screws.
Specifications for hexagon socket head cap screws having two, four, and six holes drilled in the head for lock wire applications are given in Table 7.
1.2.3 Socket Flat Countersunk Head Cap Screws.
The flat countersunk head shall have a flat top surface and a conical-bearing surface with an angle of approximately 82 deg. Specifications are given in Tables 8 through 10.
1,2.4 Socket Buffon Head Cap Screws. The button head shall have a low rounded top surface with a large flat bearing surface. Specifications are given in Table ii.
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 12.
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 13.
1.4 Socket Set Screws
The socket set screw is a screw threaded the entire length except for its length of point. The point is designed to bear on a mating part. The common point styles are cup. flat, oval, cone, and half dog. Specifications for set screws are shown in Tables 14 through 16
1.5 Keys and Bits for Driving Socket Screws
The tools for driving socket screws are hexagon keys and bits. Table 17 contains the requirements for hexagon keys and bits.
1.6 Dimensions
All dimensions in this Standard are given in inches unless stated otherwise. All dimensions apply prior to coating unless stated otherwise.
1.7 Finish
Because of the high hardness of these products, it is recommended that they not be electroplated.
1.8 Identification Marking
Producis described in paras. Ill through 114 and 1.3 with diameters larger than #10 shall be marked with the identification of the source manufacturer or private label distributor accepting the responsibility for conformance to this Standard. Marking size, type, and location of marks are at manufacturer’s option. Products shall not be marked on bearing surface.
1.9 Terminology
For definitions of terms relating to fasteners or to component features thereof used in this Standard, refer to ASME B18.12, Glossary of Terms for Mechanical Fasteners.ASME B18.3 pdf download.