ASME B18.3-2003 pdf download

ASME B18.3-2003 pdf download.Socket Cap,Shoulder, and Set Screws, Hex and Spline Keys (Inch Series).
(7) Runout
(a) The runout of the head with the axis of the shank shall be within 2% of the maximum basic screw diameter dimension, D, or 0.006 in., whichever is greater.
Runout for (a) above is defined as the full indicator movement (FIM) obtained by holding the screw on the body or major screw thread diameter within I diameter of the bearing surface of the head, but beyond the maximum length of the fillet, FL, rotating 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 screw shall be within 3% of the maximum screw diameter, D, or 0.005 in., whichever is greater for sizes through 1/2 in. diameter and 6% for sizes above 1/2 in. diameter.
Runout for (b) above is defined as the full indicator movement (FIM) obtained by holding the screw on the body or major screw thread diameter within 1 diameter of the bearing surface of the head, but beyond the maximum length of the fillet, FL, rotating 360 deg, indicating on each of the six hexagon flats.
(C) The conformance of screws to shank straightness or camber limitations set forth as De in Table IE shall be checked by the use of the procedures and typical gage illustrated in Mandatory Appendix Ill.
(8) Fillet. For all lengths of screws, the form of the underhead fillet shall be optional, as depicted in the illustration above Tables lB-i and 1B-2, provided it is a smooth and continuous concave curve fairing into the bearing surface of the head, and the screw shank is within the envelope established by the limits for fillet extension, length, and juncture radius specified in Tables lB-i and 1B-2.
(NOTE: Tables lB-i and 1B-2 are found in the Socket Head Cap Screws information.)
(9) Length. The length of the screw shall be measured parallel to the axis of the screw from the plane of the bearing surface under the head to the plane of the flat of the point. The portion of the screw contained within dimension L is commonly called the shank. The basic length dimension on the product shall be the nominal length expressed as a two-placed decimaL.
(10) Standard Lengths and Sizes (Alloy Steel). Most manufacturers consider the following diameters as standard stock items:
All of the above sizes are threaded to the head. For the exact size needed, consult with the supplier.
(11) All other characteristics are the same as Notes (3) through (6), (8), (13), (14), and (18) through (23) of Table IA for socket head cap screws.
[EXCEPTIONS: Since these are not full-size socket screw products, the requirements of paras. 7.2 and 7.3 of ASTM A574 as specified in Note (19) of Table IA wiLl not apply. Since these are not ordinarily made in spline sockets, Note (13) of Table 1A will not apply. Since these are not ordinarily made in Stainless Steel, Note (19)(b) of TabLe IA will not apply.J
(12) The minimum tensile requirements for Alloy Steel Low Head Socket Cap Screws are the same as for Alloy Steel Socket Button Cap Screws, for the same length and diameter, as per ASTM F 835.
(13) Designation. To promote uniformity and understanding in communications relating to products conforming to this Standard, it is recommended that Hexagon Low Head Socket Cap Screws be designated in accordance with the following data, preferably in the sequence shown:
(a) product name
(b) designation of the standard
(c) nominal size (number, fractional or decimal equivalent)
(d) thread pitch
(e) nominal length (fractional or decimal equivalent)
(f material
(g) protective finish, if required
EXAMPLES:
Hexagon Low Head Socket Cap Screws, ASME 818.3, 8-32 x %, Alloy Steel
Hexagon Low Head Socket Cap Screws, ASME B18.3, 0.164-32 x 0.750, Alloy Steel, Zinc Plated. (For plated products, see para. 1.7, Introductory Notes.)