MARK WITH BASIC NUMBER (“NAS” OPTIONAL), EXCEPT MARK .1900-32 SIZE WITH
“10” AND MARK .1640-32 SIZE WITH “8”, MANUFACTURERYS SYMBOL, GRIP DASH .
NUMBER, “D” WHEN APPLICABLE AND RECESS NUMBER ENCIRCLED. RECESS
NUMBER TO BE APPROXIMATELY 25% LARGER THAN OTHER NUMBERS. “D”
IDENTIFIES BOLT WITH DRILLED SHANK.