ASME B18.6.2 pdf download.Square Head Set Screws and Slotted Headless Set Screws(Inch Series).
2.1.3 Head True Position. The axis of the head shall be located at true position within a tolerance zone having a diameter equal to 6% of the specified maximum width across flats of the head, relative to the axis of the screw shank, regardless of feature size. For referee purposes, the evaluation shall be made by holding the body in a collet or chuck one bolt diameter from under the head and rotating the part. With the Indicator in line with the axis of the bolt or screw, find and record the lowest point on each flat or the highest point on each lobe. The true position is one-half of the largest absolute difference between the high and low values for any opposing set of flats or lobes.
22 Length
2.2.1 Measurement. The length of square head set screws shall be measured parallel to the axis of the screw from the intersection of the side of the head with the undersurface to the extreme point.
2.2.2 Length ToLerance. The length tolerance for square head set screws shall be as shown in Table 2.2.2-1.
2.3 Threads
2.3.1 Thread Series and CLass. The threads on square head set screws shall be Unified Inch coarse, fine, or 8- thread series, Class 2A. in accordance with ASME B 1.1. For threads with additive finish, the size limits of Class 2A apply before coating, and the thread after coating Is subject to acceptance using a basic Class 3A size GO thread gage and a Class 2A thread gage for either minimum material or NO GO.
2.3.2 Thread Gaging. Unless otherwise specified, dimensional acceptability of screw threads shall he determined based on System 21, ASME B1.3.
2.4 Thread Length
Square head set screws shall have complete (full.form) threads extending over the portion of the screw length that is not affected by the point.
The materials and properties shall be as agreed upon between the manufacturer and purchaser.
3.7 Finish
Unless otherwise specified, bolts and screws shall be supplied with a natural (as-processed) finish, unplated or uncoated. Light oil on the surface is permissible to avoid corrosion during transportation, packaging, and further handling. If slotted headless set screws are electroplated. they shall be suitably treated to minimize hydrogen einbrittlement.
3.8 Workmanship
Slotted headless set screws shall be free from burrs, seams, laps, loose scale, and other surface irregularities that may affect their serviceability.
3.9 QuaLity Assurance
Manufacturers shall provide screws in accordance with ASME B 18.18. Category 2.
3.10 Designation
Slotted headless set screws shall be designated by the following data, preferably in the sequence shown: product name; nominal size (number, fraction, or decimal equivalent); threads per inch; screw length; point style, material; protective finish, if required; and optionally, ASME B18.24 PIN code. See examples below.
EXAMPLES:
(1) Slotted headless set screw, ASME B18.6.2, 14 20 x ‘2, point, steel, zinc plated per ASTM F1941/F1941M Fe/Zn 3AN
(2) Slotted headless set screw, ASM E 818.6.2,0.190—32 *0.38, oval point, through-hardened steel, plain.
ASME B18.6.2 pdf download
