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2. Abrasion resistant steel - Wikipedia

   en.wikipedia.org/wiki/Abrasion_resistant_steel

   Abrasion resistant steel is a high-carbon alloy steel that is produced to resist wear and stress. There are several grades of abrasion resistant steel, including AR200, AR235, AR400, AR450, AR500 and AR600. [1]

3. Ballistic plate - Wikipedia

   en.wikipedia.org/wiki/Ballistic_plate

   As well, the most common material, AR500 steel, or Abrasion Resistant/ Brinell Hardness 500 steel, is actually not created for armour purposes, and thus can suffer major variances in hardness According to Leeco Steel, "While often requested for ammunition target surfaces, AR500 steel plate is not certified for ballistic use". [12]

4. Rolled homogeneous armour - Wikipedia

   en.wikipedia.org/wiki/Rolled_homogeneous_armour

   MIL-DTL-46177 is an older, now-replaced standard for a high hardness steel RHA. [4] It specifies a harder steel that is nearly identical to AR500 in terms of tensile and yield strength. [5] The Brinell hardness of AR500 is in the 477-534 range. MIL-DTL-46100E specifies a steel of identical hardness. [3]

5. Small Arms Protective Insert - Wikipedia

   en.wikipedia.org/wiki/Small_Arms_Protective_Insert

   A call for a next generation plate, to stop even greater velocity threats than the ESAPI plate was issued by the U.S. Army in 2008. [5] The X Threat Small Arms Protective Insert plates are specifically allowed scalar or flexible systems, and asked for better coverage, with less than a pound of additional weight.

6. Bulletproof vest - Wikipedia

   en.wikipedia.org/wiki/Bulletproof_vest

   ESAPI ceramic plates have a green fabric cover with the text "7.62mm APM2 Protection" on the back and a density of 35–45 kg/m 2 (7–9 lb/ft 2); they are designed to stop bullets like the .30-06 AP (M2) with a hardened steel core. Depending on revision, the plate may stop more than one.

7. List of body armor performance standards - Wikipedia

   en.wikipedia.org/wiki/List_of_body_armor...

   The VPAM scale as of 2009 runs from 1 to 14, with 1-5 being soft armor, and 6-14 being hard armor. [1] Tested armor must withstand three hits, spaced 120 mm (4.7 inches) apart, of the designated test threat with no more than 25 mm (0.98 inches) of back-face deformation in order to pass.

8. SAE steel grades - Wikipedia

   en.wikipedia.org/wiki/SAE_steel_grades

   The SAE steel grades system is a standard alloy numbering system (SAE J1086 – Numbering Metals and Alloys) for steel grades maintained by SAE International. In the 1930s and 1940s, the American Iron and Steel Institute (AISI) and SAE were both involved in efforts to standardize such a numbering system for steels.

9. Interceptor multi-threat body armor system - Wikipedia

   en.wikipedia.org/wiki/Interceptor_Multi-Threat...

   16.4 lb (7.4 kg) (with SAPI plates used; everything in Interceptor) [2] 8.4 lb (3.8 kg) (outer tactical vest) [ 2 ] The Interceptor multi-threat body armor system ( IBA ) is a bullet-resistant body armor system that was used by the United States Armed Forces during the 2000s, with some limited usage into the mid-2010s.