The NATO standard that classifies ballistic and mine protection in armored military vehicles. From Level 1 to 6 — what each means and how it applies.
STANAG 4569 (Standardization Agreement 4569) is the NATO agreement defining protection levels for light and medium armored vehicles. It covers three domains: kinetic threats (Annex A), landmines and IEDs (Annex B) and artillery (Annex C).
It is the world reference for military vehicle armor specification — including Brazilian programs such as VBTP-MR Guarani, VBC Cavalaria and Cascavel/Urutu successors.
Annex A — Ballistic (kinetic) levels
Level 1: 5.56x45 M193 and 7.62x51 NATO Ball at 30 m — light-rifle threat at close range. Typical armor: 8–10 mm ballistic steel + 40 mm ballistic glass.
Level 2: 7.62x39 BZ API at 30 m — AK threat with armor-piercing round. Thickness rises to 12–16 mm steel + composite layers.
Level 3: 7.62x51 AP (WC core) at 30 m — NATO armor-piercing. 500–600 HB ballistic steel + Kevlar/UHMWPE, typically 20–25 mm equivalent.
Level 4: 14.5x114 AP/B32 at 200 m — KPV heavy machine gun. Multi-layer armor with ceramic; front face can reach 50 mm.
Level 5: 25 mm APDS at 500 m — autocannon (e.g. Bushmaster). Outside the scope of light armor; medium-vehicle territory.
Level 6: 30 mm APFSDS — heavy vehicle protection, light and medium tanks.
Annex B — Mine and IED levels
Level 1: 6 kg TNT anti-personnel under any part of the vehicle.
Level 2a: 6 kg TNT anti-tank under the wheel — typical for 4x4 tactical vehicles patrolling risk areas.
Level 2b: 6 kg TNT anti-tank under the floor center — most critical scenario, requires V-hull or monocoque deflection.
Level 3a: 8 kg TNT under wheel. Level 3b: 8 kg TNT under floor.
Level 4a/4b: 10 kg TNT — reserved for large MRAPs (Mine Resistant Ambush Protected).
Beyond explosive mass, the standard prescribes seat acceleration limits (to protect occupants' spine) and minimum post-blast structural integrity.
How a STANAG vehicle is specified
The typical specification combines a kinetic level + a mine level. Example: 'STANAG 4569 Level 3 ballistic / Level 2a mine' — used in general-purpose 4x4 tactical vehicles.
The ballistic level can vary per face: front 4, sides 3, roof 2, floor armored only against fragments. This is standard in weight-optimized vehicles — structural reinforcement where the threat is more likely.
Each ballistic panel delivered must come with a per-lot report, engraved serial number, documented V50 curve and dimensional conformity with the vehicle drawing.
Typical materials per level
Levels 1–2: laminated ballistic steel (Armox, Ramor, Miilux) 6–12 mm + 40–50 mm ballistic glass.
Level 3: 12–18 mm ballistic steel + inner UHMWPE or aramid anti-spall layer.
Level 4: multilayer with ceramic (SiC, Al2O3 or B4C) + UHMWPE + steel; weight per m² rises significantly.
Ballistic glass evolves in parallel: polycarbonate + laminated tempered glass, with thicknesses from 40 mm (Level 1) to 90 mm (Level 4).
Application in national programs
STANAG 4569 is a direct reference for Brazilian Armed Forces contracts and strategic programs: VBTP-MR Guarani (ballistic levels 3–4, mine 2a–2b), VBC Cavalaria, and Cascavel/Urutu successors under modernization.
Military and civil police have also adopted STANAG specifications for special-operation armored vehicles, especially in units such as BOPE, COE, ROTA and CAOE.
Fortim Blindagens produces ballistic panels compatible with vehicle integration at Levels 2 to 4, delivered with ballistic reports traceable by lot and serial number and DFPC certification.
Common specification mistakes
Confusing 'STANAG Level 3' with 'NIJ Level III': they are different standards with different threats. STANAG uses military rounds and distances; NIJ 0101.06 is for civilian/police personal protection.
Requesting 'total Level 4' without threat analysis: raises weight and cost drastically and can compromise vehicle mobility. The correct approach is to distribute levels per face.
Ignoring the mine level: border or IED-risk vehicles without Annex B protection expose crew to serious blast injuries, even without fragment penetration.