Technical details

• The C material code specifies A286 corrosion-resistant alloy for the 180 ksi hex-head shear design.
• The size specifies a 0.3125-24 UNJF external thread with class 3A fit.
• Grip dash 7 specifies a nominal grip of 0.4375 in with a tolerance of plus or minus 0.010 in.
• The dated dimensions give an under-head length of approximately 0.907 in with a tolerance of plus or minus 0.015 in.
• The designation specifies an undrilled head and shank.
• The P suffix specifies a NAS4006 aluminum coating on the A286 bolt.
• The dated drawing gives a head width across flats of 0.492 to 0.502 in.