Machine screw 2-56 x 3/8 inch p-ph

Machine screw 2-56 x 3/8 inch long with phillips pan head top.

Fastener part numbering system explained:

The last 2 digits (XX) of the 4 digit fastener
part number prefix
(40XX-12345-12) indicates the standard stud size
of the bolt or screw. For example, part
#4006-01030-12 indicates a #6
stud diameter (.138") fastener.

The 2 digit part number suffix for bolts and
screws (-12, -04, -16, etc) indicates the number of 1/16" length
increments of the fastener. For example, part #4004-01003-04
indicates a screw that is 4/16" long or 1/4" long.

The middle 5 digits describe the fastener head
style or other features.

Basic diameters and threads of Standard SAE
(Society of American Engineers) numeric system small machine
screws are shown below.

The diameters of machine screws are indicated with the number of
threads per inch.

Reference: