Notes on Heavy Slotted Nut Size Data Chart Per. ASME 18.2.2.
- True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equivalent to 4% of the maximum width across flats, regardless of feature size.
- Countersink. Tapped hole shall be countersunk on the bearing face. The maximum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for 3/8 in. nominal size nuts and smaller, and 1 .O8 times the basic major diameter for nuts larger than 3/8 in. No part of the threaded portion shall project beyond the bearing surface.
- Threads. Threads shall be unified coarse, fine, or 8 thread series (UNC, UNF or 8 UN series), Class 2B.
- Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A 563, Carbon and Alloy Steel Nuts; or Grade 2 of SAE J995, Mechanical and Material Requirements for Steel Nuts. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze, and alumi- num alloys shall have properties as agreed upon between the manufacturer and pur- chaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F 594, and of several nonferrous materials in ASTM F 467.