AIA/NAS NA 0025-2007 pdf download RECESS – OFFSET CRUCIFORM DIMENSIONS OF RECESS, GAGE AND DRIVE, METRIC
NOTE: RECESS NUMBERS 6 THRU 5/16 TO HAVE A RIB ON THE REMOVAL WALL OF EACH OF THE FOUR WINGS. THE RIB IS PREFERRED TO BE GENERALLY TRIANGULAR IN SHAPE, THE CREST OF WHICH IS DEFIENED BY DEIMENSION “Z” AND IS WITHIN THE ENVELOPE SHOWN BY 0 V. MAX. AND MIN AND BE ON AT LEAST THE LOWER 75% OF THE WALL.
MARK SIZE AND GAGE DESCRIPTION，EXAMPLE: NA0025-8CTHE REMOVAL WALL OF EACH OF THE TWO WINGS ON “A” AND “C” RECESS GAGE. NUMBERS6 THRU 5/16，
TO HAVE GROOVE AS SHOWN TO CLEAR THE RIB.THE STYLE “A” TYPE GO GAGE IS USED TO MEASURE THE RECESS CAVITY AT MAXIMUMMATERIAL CONDITION，
AND THE GAGE PENETRATION VALUES OF TABLES II AND III.THE”B” TYPE GO GAGE IS USED TO LIMIT INTERFERENCE BETWEEN RECESS AND DRIVERTHE “Cu TYPE NO GO GAGE LIMITS THE MINIMUM MATERIAL CONDITION OF THE RECESS
DRIVERS FOR RECESS NUMBERS 6 THRU 5/16 ARE TO HAVE THE RIBS ON THE REMOVAL WALL OF EACH OF THE FOUR WINGS. THE RIB IS PREFERRED TO BE GENERALLY TRIANGULAR IN SHAPE, HAVING BASE, HEIGHT AND LOCATION DIMENSIONS WHICH FALL WITHIN THE ENVELOPE OF THE MIN/MAX DIMENSION SHOWN. WING THICKNESS TO BE MEASURED OVER RIBS.

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