Size 5/16 x 1 and item has pan head
An externally threaded fastener whose threaded portion is of one nominal diameter, no 0 (0.060 in./1.5 mm) or larger, designed to be held or driven with either a wrench or an inserted driver or both (excluding internal socket or internal multiple spline types), in sizes below no. 10 (0.190 in./5 mm). No. 10 and larger sizes must have a head designed for any type inserted driver (excluding internal socket or internal multiple spline types), but may also be designed for external wrenching. A locking feature may be incorporated in the design of the head or threads. Excludes bolt, clevis; bolt, externally relieved body; screw, externally relieved body; and screw, assembled washer. See also, screw, instrument; bolt, machine; bolt, internal wrenching; and screw, cap socket head.
NSN 5895-00-284-3005
NSN 5990-00-757-5262
NSN 5965-01-534-2818
NSN 6685-01-407-9432
NSN 5975-01-198-6043
NSN 6620-01-159-8790
NSN 7035-01-581-7000
NSN 2925-01-244-3016
NSN 6620-00-500-0041
NSN 5960-01-142-6981
NSN 6105-01-291-3515
NSN 6685-01-087-4432