Abstract： ASME B18.6.2:2020 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 th...

ASME B18.6.2:2020 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 leature 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 axisoithe bolt or screw, find and record the lowest point on each flat

or the highest point on each lobe. The true position is one-halt of the largest absolute difference between the high and low values for any opposing Set of flats or lobes.

2.2 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 Bt.1. For threads with additive finish, the size limits of aass 2A apply before coating, and the thread after coating is sub)ect 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 be determined based on System

21. ASME B1.3.

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