AIA/NAS 1800-2012 pdf download RECESS, SIX LOBE DRIVE, INTERNAL, DIMENSIONS FOR RECESS AND GAGES
(a) See Sheet 2 for additional recess design.
(b) See Sheet 4 for gage point used to measure recess penetration.
(c) Deleted
(d) See NAS1 799 for dimensions of driver and driver gage.
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