How body armor levels from ii to iv map to the threats NIJ actually tests

Quick Answer

Body armor levels represent the minimum ballistic resistance requirements a vest must meet to stop specific types of projectiles. Tactical Enclave's advice is to verify the actual threat ratings against the NIJ Standard-0101.06 before purchasing any equipment.

Defining the standard for body armor levels

NIJ body armor levels indicate the ballistic threat a vest can stop. Level II and Level IIIA protect against handgun rounds, so you should compare different types of body armor to determine who should wear level iiia. Level III and Level IV protect against rifle rounds. The National Institute of Justice identifies these as HG1, HG2, RF1, and RF3 respectively.

NIJ body armor levels and plate carrier types

Old Label	New Threat Level	Ballistic Threat Type
NIJ Level II	NIJ HG1	Handgun fire protection
NIJ Level IIIA	NIJ HG2	Handgun fire protection
NIJ Level III	NIJ RF1	Rifle fire protection
NIJ Level IV	NIJ RF3	Rifle fire protection

What do the NIJ body armor levels mean, from II to IV?

Under the older labels, Level II and Level IIIA cover handguns and Level III and Level IV cover rifles.

New HG and RF designations

Level II is now HG1, Level IIIA is now HG2, Level III is now RF1 and Level IV is now RF3. A new intermediate level, NIJ RF2, exists between RF1 and RF3. This system determines which threats a specific level body armor will stop during testing.

Russian standards and ceramic plate properties

Ceramic plates use a hard material to shatter and disperse the energy of a high-velocity projectile. Ceramic is a hard material used in armor plates to shatter and disperse the energy of high-velocity projectiles. The NIJ Compliance Testing Program anticipates maintaining the 0101.06 Compliant Products List through at least the end of calendar year 2029.

How did the newer NIJ standard rename the levels, and what are HG1, HG2, RF1, RF2 and RF3?

The newer NIJ standard replaces the previous designations with HG1, HG2, RF1, RF2, and RF3 to categorize levels of body armor.

Intermediate rifle level and new specifications

The NIJ RF2 designation serves as a new intermediate rifle level. It includes all the threats at the NIJ RF1 protection level plus an additional threat. The ballistic test threats moved into Specification for NIJ Ballistic Protection Levels and Associated Test Threats, NIJ Standard 0123.00, according to National Institute of Justice.

New and old armor designations

Old Designation	New Designation	Threat Category
NIJ Level II	NIJ HG1	Handgun protection
NIJ Level IIIA	NIJ HG2	Handgun protection
NIJ Level III	NIJ RF1	Rifle protection
NIJ Level IV	NIJ RF3	Rifle protection

Validity of older armor standards after the update

An armor rating identifies the specific threat a material can stop.

Armor rating determines the specific threats the gear can stop

An armor rating is a classification based on standardized ballistic tests. It identifies the specific types and velocities of bullets the material is certified to stop. You must know the rating to ensure the armor protects against the specific threats you face.

Specific ammunition used to test body armor

Handgun levels use specific projectiles to determine ballistic resistance. NIJ HG1 uses 9mm Luger and .357 Magnum rounds. NIJ HG2 uses 9mm Luger and .44 Magnum rounds. Rifle levels use different ammunition, so handgun results do not apply to rifle protection.

Bulletproof vest test projectiles

• The NIJ HG1 level of body armor requires a 9mm Luger FMJ RN 124 grain projectile with a reference velocity of 1305 ft/s(398 m/s) according to National Institute of Justice.
• The NIJ HG1 standard includes a .357 Mag JSP 158 grain projectile with a reference velocity of 1430 ft/s(436 m/s) according to National Institute of Justice.
• The NIJ HG2 standard uses a 9mm Luger FMJ RN 124 grain projectile with a reference velocity of 1470 ft/s(448 m/s) according to National Institute of Justice.
• The NIJ HG2 standard requires a .44 Mag JHP 240 grain projectile with a reference velocity of 1430 ft/s(436 m/s) according to National Institute of Justice.
• The NIJ RF3 standard uses a 30.06 M2 AP165.7 +0/-7 grain projectile with a reference velocity of 2880 ft/s(878 m/s) according to National Institute of Justice.

Rounds used for handgun and rifle testing

Handgun tests focus on common pistol calibers like 9mm and .44 Magnum. Rifle tests utilize high-velocity rounds such as 5.56mm and 7.62mm. You can learn how trauma pads work while each standard defines specific velocities and grain weights to verify protection.

Is a higher level always better protection for a person?

A higher level is not always better protection for a person. While higher levels stop more powerful projectiles, they increase the weight and bulk of the equipment. This added mass can hinder movement or cause fatigue during a long shift.

Matching armor to specific environments

The correct choice depends on the specific threats a wearer faces. A hybrid soft body combines different materials to balance protection and flexibility. A hybrid soft body is a type of armor that combines different materials to balance protection and flexibility. Users must choose a level that matches their environment and remains wearable for an entire work period.

How protection levels relate to user safety

Armor weight impacts the wearer’s mobility and endurance. Selecting a level like NIJ RF2 provides a balance by covering more threats than NIJ RF1 without the weight of the highest levels.

What information is missing from a protection level

Ratings only confirm that the material meets minimum performance requirements for certain rounds.

Internal components and kit configurations

Armor panels are the internal components that stop projectiles and vary in weight and thickness. An armor kit includes the carrier and accessories used to wear the panels. Manufacturers design different configurations to change how these components sit on the body.

Body protection limitations

• A protection level does not specify the total surface area covered by the vest.
• A protection level does not describe the method used to hold panels in place.
• A protection level does not indicate the weight of the armor kit.
• A protection level does not measure the backface signature, which is the depth of the indentation left in the material after a hit.
• A protection level does not provide information regarding the expiration or age of the material.

Limitations of the NIJ rating system

These standards verify that armor stops specific threats but do not regulate the physical dimensions or the ergonomics of the equipment.

Who needs to read these levels carefully

Officer upgrading from an older vest

If you are an officer replacing a Level IIIA vest, you should check the new HG2 listing and the declared warranty.

First-time civilian buyer

When you are a first-time civilian buyer reading old and new level names, you should translate the levels using the mapping before comparing models.

Department supply officer

You should name both the standard and the level when you are a department supply officer writing purchase specs, since the 0101.06 list continues.

Where level names trip people up

• Mixing old and new level names may cause a buyer to think RF1 and Level III are different when they are the same rating.
• Assuming a level covers every round means the armor only covers the test rounds, so other rounds can defeat the armor.

How to choose body armor levels based on NIJ test threats

Selecting the correct protection requires matching your specific safety needs to the official ballistic test threats and standards.

Selection process for ballistic protection

1. Write down which level you need. Identify your required protection level before looking at products. This establishes your baseline for the rest of the process.
2. Translate between old and new names using the mapping. Use the mapping to identify the correct designation. For example, NIJ Level III is now NIJ RF1, and NIJ Level IV is NIJ RF3.
3. Check the model on NIJ's compliant products list. Verify the specific model is on the 0101.06 Compliant Products List. This ensures the armor meets the National Institute of Justice requirements.
4. Read the test rounds for the level you are buying. Consult the NIJ Standard 0123.00 to see the specific threats. Confirm the test threat matches the protection level you identified in step one.
5. Ask for the maker's label and warranty. Request the manufacturer's label and warranty from the provider. This confirms the product's identity and the maker's guarantee of performance.

Frequently asked questions