A Quick Guide to ANSI Types and Classes of Hard Hats

Key Takeaways

• • Hard hat types describe impact and penetration performance, while classes describe electrical protection.

  • Type I protects against top impacts, while Type II adds lateral impact and off-center penetration protection.

  • ANSI/ISEA Z89.1-2026 adds optional Type I+ and Type II+ designations for enhanced retention, chin-strap performance, and additional impact testing.

  • Select head protection by assessing impact direction, electrical exposure, fit, retention, and PPE compatibility, then verify the type and class marked inside the helmet.

Hard hats help protect workers from falling objects, impacts, penetration, and, when properly classified, electrical hazards. ANSI/ISEA Z89.1 establishes performance and testing requirements for industrial head protection, while OSHA requires employers to provide head protection when workplace hazards call for it.

Under ANSI/ISEA Z89.1-2026, type describes impact and penetration performance, while class describes electrical protection. The standard retains Type I and Type II and adds optional Type I+ and Type II+ designations for head protection tested beyond the base requirements.

This guide explains how the types and classes differ, what the new “+” designation means, how to read a helmet’s markings, and how to select, inspect, and replace head protection for the hazards present.

Hard Hat Types and Classes at a Glance

ANSI/ISEA Z89.1-2026 is the newest voluntary consensus standard. OSHA’s general-industry rule, 29 CFR 1910.135, and construction rule, 29 CFR 1926.100, currently incorporate ANSI Z89.1-1997, Z89.1-2003, and Z89.1-2009. Both also allow other head protection when the employer demonstrates that it is at least as effective as equipment meeting the incorporated standards. The 2026 edition therefore does not, by itself, create a new OSHA requirement; employers still need to follow the OSHA rule and hazard assessment that apply to the work.

ANSI Types of Hard Hats

ANSI/ISEA Z89.1 retains two base impact types, Type I and Type II. The 2026 edition also adds optional Type I+ and Type II+ designations for head protection that meets additional performance requirements. Below is how the two base types differ:

Type I Hard Hats

Type I hard hats are tested for impact force transmission and penetration resistance at the top of the helmet. They are commonly selected where the primary head-injury hazard comes from falling objects or overhead work. The Type I rating must be confirmed from the helmet’s markings rather than its brim shape or style.

Type II Hard Hats

Type II hard hats meet the base Type I requirements and are also tested for lateral impact energy attenuation and off-center penetration resistance. They may be appropriate where workers could strike or be struck on the front, rear, or sides of the head. A larger brim does not establish a Type II rating, so check the marking inside the helmet.

The optional “+” designation shows that the helmet has been tested beyond the base Type I or Type II requirements. Type I+ adds a required chin strap, chin strap and helmet-retention testing, and off-center impact testing at the front, rear, and sides. Type II+ adds a required chin strap and enhanced retention testing to Type II impact protection. The added designation can support a hazard-based selection, but it does not mean every task requires a “+” helmet.

Select head protection based on the hazards identified for the task, not on job title or industry alone. Different tasks within the same workplace can require different impact types, electrical classes, or retention features.

ANSI Classes of Hard Hats

In addition to its impact types, ANSI/ISEA Z89.1 identifies three electrical classes: Class G, Class E, and Class C. The type tells you how the helmet was tested for impact and penetration, while the class tells you its level of electrical protection. A helmet can carry both a type and a class, such as Type II, Class E.

Class G (General Hard Hats)

Class G helmets provide limited electrical protection and are tested at 2,200 volts. They may be used for general industrial work when the hazard assessment supports that class. The test voltage is a controlled laboratory value, not a safe working-voltage limit or a substitute for required electrical controls and PPE.

Class E (Electrical Hard Hats)

Class E helmets provide the highest level of electrical insulation in the ANSI/ISEA classification system and are tested to withstand 20,000 volts. They are commonly selected where the hazard assessment identifies exposure to higher-voltage electrical hazards. The test voltage does not establish a safe working distance or replace de-energization and other required electrical-safety measures.

Class C (Conductive Hard Hats)

Class C indicates no electrical protection. A Class C helmet still carries a separate impact Type designation, so verify both the Type and Class markings before use. Use Class C only where the hazard assessment finds no electrical-contact hazard. Some vented helmets are Class C, but vents or other visible features do not confirm the rating; check the label inside the helmet.

How to Read a Hard Hat’s ANSI Markings

Check the permanent label or marking inside the helmet before relying on its appearance. Confirm the manufacturer, date of manufacture, ANSI/ISEA Z89.1 designation, impact type, electrical class, and head-size range. If the helmet meets optional criteria, its markings may also include ‘+,’ HT, LT, EV, or the reverse-wearing mark.

Only wear head protection in reverse when the applicable marking and manufacturer instructions permit it. Do not treat the manufacture date as a universal expiration date. Service life and component-replacement intervals come from the manufacturer and may be shortened by impact, sunlight, chemicals, heat, damage, or heavy use.

Do ANSI Hard Hat Colors Indicate Type or Class?

ANSI/ISEA Z89.1 does not assign job roles, impact types, or electrical classes by shell color. White, yellow, green, red, blue, orange, and brown may carry familiar meanings at some sites, but those conventions vary by employer, industry, and location. A helmet’s color does not confirm its protective rating.

If an employer uses color to identify roles, crews, visitors, or emergency responsibilities, that system should be documented and explained during site orientation. Always use the certification marking, not color, to verify the helmet’s type and class.

Choosing the Right Hard Hat for the Job

When I review head protection, I start with the hazard and then verify the marking inside the helmet. Shell style and color can create a quick impression, but neither confirms the impact type or electrical class. I still check impact direction, electrical exposure, retention, fit, and compatibility with the rest of the PPE before deciding that the helmet matches the task.

ANSI/ISEA Z89.1 does not define ‘hard hat’ and ‘safety helmet’ as separate protection categories. The label, not the marketing name or shell style, establishes the helmet’s Type, electrical Class, and optional performance designations.

• Identify where credible impacts could come from and select the appropriate type.

• Identify electrical-contact hazards and select the appropriate class.

• Confirm retention needs, including movement, work at height, or fall potential.

• Check fit and compatibility with required eye, face, hearing, or respiratory protection.

• Confirm the markings and follow the manufacturer’s limits for temperature, chemicals, ultraviolet exposure, accessories, and service life.

Tips for Properly Fitting and Adjusting a Hard Hat

• Measure the circumference of your head to ensure a proper fit

• Adjust the suspension system to make sure the hard hat sits comfortably and securely on your head

• Use only sweatbands, chin straps, padding, and other accessories that the helmet manufacturer identifies as compatible with that model.
  

Importance of Maintaining and Replacing Hard Hats

• Inspect the shell, suspension, chin strap, and required markings before use.

• Remove the helmet from service after an impact or when it shows cracks, dents, deformation, brittleness, fraying, chemical damage, or other conditions identified by the manufacturer.

• Follow the manufacturer’s service-life and component-replacement instructions instead of relying on one universal expiration period.

• Clean and store the helmet as directed by the manufacturer, away from damaging chemicals, heat, and prolonged sunlight.
  

By taking these factors into consideration, individuals can choose the appropriate hard hat for the job and support the level of protection the helmet is designed to provide.

If you are comparing specific designs after confirming the required type and class, see our hard hat reviews and recommendations.

 

FAQs

Are all hard hats required to have a chin strap?

No. The need for a chin strap depends on the helmet’s design, the manufacturer’s instructions, the employer’s requirements, and hazards such as climbing, work at height, or movement that could dislodge the helmet. Under ANSI/ISEA Z89.1-2026, a chin strap and additional retention testing are required for the optional Type I+ and Type II+ designations.

How often should hard hats be replaced?

There is no single replacement interval that applies to every hard hat. Follow the helmet manufacturer’s service-life and suspension-replacement instructions, and replace the helmet sooner after an impact or when inspection finds damage, degradation, or an unreadable required marking. The manufacture date helps identify the helmet, but it is not automatically the expiration date.

Can I customize my hard hat with stickers or paint?

Only if the helmet manufacturer allows it and the material will not damage the shell or hide defects that need to be inspected. OSHA does not impose an absolute ban on stickers or paint, but some adhesives, paints, and solvents can affect shell performance. Follow the manufacturer’s instructions and keep required markings visible.

What is the difference between a hard hat type and class?

A hard hat’s type describes its tested impact and penetration performance, while its class describes electrical protection. Type I addresses top protection, and Type II adds lateral impact and off-center penetration testing. Classes G and E provide different levels of electrical insulation, while Class C provides no electrical protection.

What do Type I+ and Type II+ mean?

The “+” indicates testing beyond the base Type I or Type II requirements under ANSI/ISEA Z89.1-2026. Type I+ adds a required chin strap, enhanced retention, and off-center impact testing at the front, rear, and sides. Type II+ adds a required chin strap and enhanced retention testing to Type II impact protection.