SAPI

SAPII stands for "Small Arms Protective Insert." It is a standard for ballistic inserts used in plate carriers. This standard was developed by the United States Army and denotes the sizes and shapes of ballistic inserts used for protection against bullets.

SAPI ballistic inserts are typically made from materials like ceramic or ballistic steel and are placed in pockets on the front and back of the plate carrier. These inserts have standardized dimensions, allowing plate carriers from various manufacturers to use the same ballistic inserts.

The SAPI standard helps ensure that ballistic inserts are compatible with various plate carriers, and soldiers can easily upgrade or replace their ballistic inserts as needed.

Standard SAPI (Small Arms Protective Insert) defines several sizes. Here are common sizes:

SAPI Small (S): 8.75" x 11.75" (22.23 cm x 29.85 cm)

SAPI Medium (M): 9.5" x 12.5" (24.13 cm x 31.75 cm)

SAPI Large (L): 10.125" x 13.25" (25.72 cm x 33.66 cm)

SAPI Extra Large (XL): 11" x 14" (27.94 cm x 35.56 cm)

These dimensions allow adaptation of ballistic inserts to different body sizes, enabling plate carrier manufacturers to produce equipment that fits various anatomical shapes and sizes of soldiers. It's important to note that there are several variants and revisions of the SAPI standard, but the mentioned dimensions align with common specifications.