ASME B18.3:2003 pdf free download

ASME B18.3:2003 pdf free download.Socket Cap,Shoulder, and Set Screws,Hexand Spline Keys(Inch Series).
(14) Runout
(q) The runout of the head with the axis of the shoulder shall be within 2% of the nominal size, or 0.006 in., whichever Is greater.
Runout for (a) above is defined as the full indicator movement (ElM) obtained by holding the shoulder screw on the shoulder within one diameter of the bearing surface of the head, but beyond the maximum length of F, rotating the shoulder screw 360 deg and indicating on the outside diameter of the head.
(b) The runout of the socket with the axis of the shank of the shoulder screw shall be within 3% ot the maximum shoulder diameter. 0. or 0.005 in., whichever is greater for nominal sizes through ‘I, in. diameter and 6% for nominal sizes above ‘/ diameter.
Runout for (b) above is defined as the full indicator movement (ElM) obtained by holding the shoulder screw on the shoulder or major screw thread diameter within 1 diameter of the bearing surface of the head, but beyond the inaximum length of F, rotating 360 deg and indicating on each of the six hexagon flats.
Runout between the screw thread and shoulder shall be checked by flnnly seating the screw thread in a threaded bushing. The thread of the bushing must be basic size and the bushing O.D. must be concentric with Its axis, and the ends must be square with its axis.
The runout between the screw thread and shoulder shall be a maximum of 0.004 In. full Indicator movement (ElM) when checked on the shoulder diameter at a distance of 0.188 in. from the shoulder at the threaded end, and at within 0.005 in. full indicator movement (ElM) per inch of shoulder length, with a maximum of 0.025 in., when checked on the shoulder a distance of 2F from the underside of the head. The bushing is to be rotated, in a V block or eqiivafent, 360 deg, with the indicator riding on the major diameter of the shoulder in the appropriate locations.
The squareness of the shoulder shall be perpendicular to the axis of the shoulder screw, withIn 2 deg obtained by holding the shoulder screw on the shoulder diameter within I diameter of the thread end of the shoulder, rotating 360 deg, and inspecting on an optical comparator or comparable Inspection equipment.
(15) Material. Shoulder screws shall be fabricated from an alloy steel having one or more of the following alloying elements: chromium, nickel, molybdenum, or vanadium, In sufficient quantity to ensure that the specified hardness range of 32 HRC to 43 HRC at the surface is met when hardened by quenching from the austenitizing temperature and tempered at not lower than 343°C (650°f). Decarburization and carburization limits shall be the same as those specified for socket head cap screws in ASTM A 574.
Shoulder screws shall meet the following mechanical property requirements; the hardness shall be 32 HRC to 43 HRC anywhere in the section.