AIA/NAS 618-2010 pdf download FASTENER, RECOMMENDED SHANK, HOLE, AND HEAD-TO-SHANK FILLET RADIUS LIMITS FOR
NOTES:
LIMITS ARE MET AFTER PLATING.
THE SELECTION OF COLUMN A,B OR C FOR AN ITEM SHOULD CONSIDER ITS POTENTIAL END USAGE IN HOLES RECOMMENDED ON SHEET 3
FOR SIZES .5000 AND SMALLER,THE MAXIMUM SHANK DIAMETER FOR ALL CLASSES IS EQUAL TO MAXIMUM MAJOR DIAMETER OF THREADMINUS .0005 AND/OR EQUAL TO MINIMUM BORE DIAMETER.FOR SIZES .5625 AND LARGER THE AXIMUM SHANK DIAMETER FOR ALL CLASSES IS EQUAL O MAXIMUM MAJOR DIAMETER OF THREADSMINUS .0010 AND/OR EQUAL TO MINIMUM BEARING BORE DIAMETER MINUS .0005THE MAXIMUM LIMIT IS CONSTANT FOR ALL CLASSES. THE LOWER LIMIT VARIES WITH CLASS.
IN RECOGNITION OF SOME COMPANIES PRACTICE OF ACCEPTING HOLES MADE TO .001 BELOW NOMINAL SIZE (EXAMPLE: ,250-001) THE ENDWHICH ENTERS THE HOLE FIRST (SUCH AS THREADS, GROOVES.ETC,) SHALL BE DIMENSIONED TO PROVIDE CLEARANCE. EXAMPLE FORCOLUMN ALIMITS USING THREADS: THE MAXIMUM MAJOR DIAMETER OF THREADS SHALL BE .001 LESS THAN THE MINIMUM SHANK DIAMETER
CONSIDERATION SHOULD ALSO BE GIVEN THIS POINT FOR INTECHANGEABLE USE OF DIFFERENT ITEMS.EXAMPLE: A THREADED ITEMMAY BE USED INTERCHANGEABLY WITH A GROOVED ITEM PROVIDING THE END PORTION CAN BE INSERTED N THE INTENDED HOLE WITHOUTINTERFERENCE.
COLUMN A REPRESENTS CLOSE LIMITS OF PRECISION MANUFACTURING
THE UNPLATED PORTION FOR USE AS JOURNALS WHERE GALLING OF PLATING IS DETRIMENTALTHE PLATE PORTION FOR USE WHERE ADDED CORROSION PROTECTION IS NEEDED.
THESE PRECISION LIMITS ARE RECOMMENDED FOR ITEMS WHICH WHEN COUPLED WITH CLOSE LIMIT HOLES WILL PRODUCE A CONNECTION HAVING AMINIMUM CLEABANCE.EXAMPLE: SHEAR AND REVERSING SHEAR OAD CONNECTIONS AS HEAVY STRLCTLRE HINGE RRACKETS EARING ETC
COLUMN B REPRESENTS CONTROLLED LIMITS OF MANUFACTURING
THESE CONTROLLED LIMITS ARE RECOMMENDED FOR TEMS WHICH WHEN COUPLED WITH CONTROLLED LIMIT HOLES WILL.PRODUCE CONNECTIONS HAVINGINTERFERENCE OR COMBINATION OF INTERFERENCE CLEARANCE.EXAMPLE: SHEAR CONNECTION.PERMANENT STRUCTURAL CONNECTIONS.ETC
COLUMN C REPRESENTS GENERAL PURPOSE LIMITS OF MANUFACTURING
THESE GENERAL PURPOSE LIMITS ARE RECOMMEDED FOR ITEMS WHICH WHEN COUPLED WITH GENERAL PURPOSE HOLELIMITS WILL PRODUCE CONNECTIONS HAVING CLEARANCES OF VARYING DEGREES

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