Abstract： ASME B18.2.2:2015 pdf download.Nuts for General pplications: MachineScrew Nuts, Hex, Square, Hex Flange,and Coupling Nuts(1nch Series). 3.8.2 Square Nuts. Theaxueof tapped hole in square nuts shall be located at true position with respect t...

ASME B18.2.2:2015 pdf download.Nuts for General pplications: MachineScrew Nuts, Hex, Square, Hex Flange,and Coupling Nuts(1nch

Series).

3.8.2 Square Nuts. Theaxueof tapped hole in square nuts shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equivalent to 10% of the maximum width across flats. regardless of feature size.

3.9 Bearing Surface Perpendicularity

Bearing surface shall be flat and perpendicular to the axis of the threaded hole within the specified full indicator measurement

(FIM) limit indicated In the tables. See Nonmandatory Appendix C for measurement procedure.

3.10 Threads

3.10.1 Thread Standard. Threads shall meet the requirements of ASME 61,1.

3.10.2 Thread Class. Unless otherwise specified. threads shall he Unified Standard, Class 26.

3.10.3 Thread Series. Thread series on nuts may be coarse (UNCj, tme tUsT), or 8 thread series (8UN).

3.10.4 Thread Gaging. Unless otherwise specified by the purchasc gaging br screw thread dimensional acceptability shall be in

accordance with Caging System 21 as specified in ASME 61.3. Screw Thread Gaging Systems for Acceptability.

3.10.4.1 Thread 6aging of jam Nuts. Due to the three turn allowance and limited number of threads in am nuts. NOT GO thread plug

gages are not a reliable method for thread acceptance- Unless otherwise specified by the purchaser. am nut thread acceptablitv

shall be based on acceptance of the GO thread plug gage and nanacceptancr of the NOT GO cylindrical plug gage to inspect minor

diameter.

3.11 Material

Unless otherwise specified by the purchaser or eLsewhere in this Standard, chemical and mechanical properties of steel nuts shall

conform to Grade A of ASTM A563, Carbon and Alloy Steel Nuts or Grade 2 isquare nuts only) of SAE J995, Nuts of other materials

such as corrosion resistant (stainless) steel, brass, bronze. and aluminum alloys shall have properties as agreed upon between

thr manufacturer and purchaser. Refer to ASTM F54 for information on corrosion resistant alloy steel requirements and ASTM F467 for information on nonferrous materials.

Recommended：