Attribute Schema Library
Attribute schemasafety & PPE

Hard Hat Attributes

Hard hats are industrial head protection certified to ANSI/ISEA Z89.1 and required by OSHA 1910.135 and 1926.100 wherever falling-object or electrical-contact hazards exist. Safety and PPE distributors sell them to construction GCs, utilities, refineries, mills, and industrial MRO buyers — usually by the case, in crew colors, against a site's written hazard assessment.

The data is hard for three reasons. First, the two facts that decide the sale — impact Type and electrical Class — are one token on a distributor's filter rail ("Type 1, Class E") and six different spellings in supplier feeds. Second, the specs that prevent returns live nowhere structured: which earmuff frame the shell's slots accept, which suspension part number replaces the one in the box, what temperature the shell softens at. Those are in the datasheet PDF and the fit guide, not the price file.

Third, the category is drifting. Climbing-style safety helmets with 4-point chin straps now certify to the same Z89.1 Types as traditional caps, and suppliers file them under whatever marketing calls them.

Core

Every SKU needs these. Without them the record is not a product, it is a row.

Manufacturer Part Number (MPN)
identifier
ERB 19951 (Omega II, full brim, white)

The only reliable key for cross-referencing suspensions, accessories and competitor sheets. Buyers reorder by MPN, not description.

Brim Style
enum
Full Brim

First filter on almost every head-protection rail. Full brim sheds rain and sun; cap style clears a welding hood and fits tight spaces.

ANSI Type
enum
Type I

Type I is top impact only; Type II adds front, back and side impact plus off-center penetration. Site hazard assessments specify one or the other.

ANSI Electrical Class
enum
Class E

Class E is proof-tested to 20,000 V phase-to-ground, Class G to 2,200 V, Class C offers none. Utility and electrical work will not accept a substitute.

Shell Material
enum
HDPE

Drives heat tolerance and weight. HDPE and ABS soften well below foundry conditions; fiberglass is the melt-shop and molten-splash answer.

Suspension Type
enum
Ratchet

Ratchet adjusts one-handed without removing the hat; pinlock is cheaper and slower. Crews standardize on one and will not mix.

Suspension Points
number · points
6

4-point is the volume default; 6-point spreads load for long shifts and heavier accessory loads. A real, filtered comparison point.

Head Size Range
range · US hat size
6-1/2 to 8

Ratchet suspensions typically span 6-1/2 to 8; pinlock bands span less. Out-of-range workers cannot wear the hat at all.

Shell Color
enum
Hi-Vis Orange

Sites color-code by trade and role. Color is a hard requirement on the PO, not a preference, and hi-vis shells are ordered separately.

Vented
boolean
false

Vents buy airflow but breach the dielectric barrier, so a vented shell can only be Class C. Determines where the hat may legally be worn.

Differentiating

What buyers actually compare on. This is where catalogs win or lose the filter.

Shell Weight
number · oz
14.1 oz

The comparison buyers actually run when trading a traditional cap against a climbing-style helmet or a fiberglass shell.

Accessory Slot System
enum
MSA V-Gard slotted (cap-mounted)

Determines which cap-mounted earmuffs and faceshield frames will physically mate. Slot systems are brand-specific, not interchangeable.

Chin Strap Configuration
enum
4-point, included

At-height and tower work demands retention. A 2-point strap is an accessory; a 4-point strap is what climbing-style specs are written around.

Reverse Donning Rated
boolean
true

Welders, utility crews and vehicle inspectors wear the hat backward. Only shells tested in reverse carry the two-arrow mark.

Compliance & identifiers

Standards, regulatory data, and the identifiers channels reject you for missing.

Optional Performance Markings
text
LT, reverse donning

LT (tested at about -30 C), HT (about 60 C), HV (high visibility) and the reverse-donning symbol are earned marks, not marketing claims.

Standards Marked on Shell
text
ANSI/ISEA Z89.1-2014 (R2019); CSA Z94.1-15

Cite the edition as marked. OSHA references Z89.1 compliance; there is no such thing as an OSHA-approved hard hat.

GTIN / UPC
identifier
UPC-A (12-digit); GTIN-14 for case packs

Mandatory for marketplace listings and case-level ordering. Missing or reused GTINs get listings suppressed rather than corrected.

Country of Origin
identifier
United States

Required for customs, Buy American clauses on federal and infrastructure jobs, and most public-sector bid packages.

The fields that aren't in the schema at all

What most hard hats catalogs are missing.

The table above is the schema most catalogs already have. These are the attributes that usually aren't in it — each one surfaced by a signal from the live market rather than by an audit of what's already there. This is what Anglera's Schema Foundry does on a real catalog, in this category.

Supplier signal
+ Accessory Slot System

Manufacturer accessory catalogs sell frames explicitly as 'for slotted caps' versus 'universal', and earmuffs as brand-fit. Hard hat records carry at most a 'slotted: yes' flag, never which system.

Customer orders a shell plus cap-mounted earmuffs that will not mate. Both lines come back, and the attach sale that justified the bundle is lost.

Supplier signal
+ Replacement Suspension Part Number

Suspensions are replaced on a far shorter interval than shells, and every supplier publishes a replacement SKU. Catalogs list hats and suspensions as unlinked SKUs with no compatibility field.

Recurring suspension revenue goes to whoever holds the crosswalk. Counter staff guess, and the wrong band ships against the wrong shell.

Search signal
+ Shell Continuous-Use Temperature

Datasheets state the thermoplastic softening limit and why fiberglass is specified for radiant heat. No distributor filter rail exposes a temperature field; 'high heat hard hat' returns color results.

An HDPE shell gets spec'd into a melt shop or foundry. Best case it is returned after one shift; worst case it deforms in service.

Marketplace signal
+ Head Size Range

Suspension type sets the band range, yet listings resolve to free-text 'One Size Fits Most' in the description with no structured field. Buyers searching for a size 8 fit get nothing back.

Crew at the ends of the range cannot wear the issued hat. The site reorders a second SKU and the original case sits.

Competitor signal
+ Reverse Donning Rated

The two-arrow reverse-wear mark is an earned Z89.1 test result, and welding and utility buyers ask for it by name. Most catalogs have no such field; the mark shows only in the shell photo, if at all.

Reverse-rated SKUs are invisible to the buyers who need them, and unrated hats get quoted into weld and bucket-truck work by mistake.

How Schema Foundry finds these

Messy in, governed out.

The same value, spelled every way safety & PPE suppliers spell it. A filter only works once they agree.

ANSI Classification
Type 1 Class ETYPE I / CLASS EType-1, Class E (20kV)ANSI Z89.1 Type I-EClass E Type 1T1CE
Type I, Class E

Rails facet on the combined token. Every free-text variant silently drops out of the filter instead of erroring.

Head Size Range
6 1/2 - 86.5-8One Size Fits Most52-64 cm20.5" - 25.2"S-XL
Hat size 6-1/2 to 8 (52-64 cm)

Hat size, head circumference and S/M/L are three different scales. Suppliers mix all three in one column.

Brim Style
Full BrimFull-BrimFullbrimWide BrimFront BrimCap Style
Full Brim | Cap Style (front brim)

Front brim and cap style are the same thing. Short brim is a climbing-style helmet and must not collapse into cap.

Suspension Type
4-Pt RatchetWheel RatchetPin LockPinlockPin-LockSwing Strap
Ratchet | Pinlock

Point count and adjustment mechanism are two facts jammed into one supplier field. Split before they reach the facet.

What buyers ask

Every one of these should be answerable from the attributes above. If it isn't, that's a gap.

  • Is this Class E rated to 20,000 volts, or only Class G?
  • Will this take my V-Gard cap-mounted earmuffs, or do I need the universal frame?
  • Does the suspension go up to a size 8? Half my crew is out of range.
  • Can this hat be worn backwards for welding?
  • Is the vented version still OK around energized equipment?
  • What suspension part number do I order to replace this one next year?
  • Will an HDPE shell hold up in the melt shop, or do I need fiberglass?
  • Is this Type II, or Type I with a chin strap added?

What channels require

The same SKU, different mandatory fields per destination.

Amazon Business
GTIN / UPCMPNBrandANSI TypeANSI Electrical ClassCountry of Origin
Distributor faceted site and on-site search
Brim StyleANSI TypeANSI Electrical ClassSuspension TypeSuspension PointsVented
eProcurement punchout (Ariba / Coupa, CIF or cXML)
MPNUNSPSC codeANSI ClassificationHead Size RangeShell Color

Hard Hats data, in practice

Why can't a vented hard hat be Class E?

Class E and Class G are dielectric ratings, proof-tested at 20,000 V and 2,200 V phase-to-ground respectively. Ventilation holes breach the shell's insulating barrier, so a vented shell cannot be tested to either — it is Class C by construction, regardless of what the plastic is. This is a hard interlock worth enforcing as a validation rule: if Vented = true, Class must be C. Supplier feeds routinely violate it, usually because the vented and non-vented variants share a marketing description and someone copied the Class E line down the family.

Should ANSI Type and Class be one attribute or two?

Store two governed enums and derive the combined token for display and faceting. Distributor rails expose it as a single label ('Type 1, Class E') because that is how buyers think, but Type and Class are independent test outcomes and buyers filter on each alone — an electrical contractor filters Class E across both Types; a steel erector filters Type II across all Classes. Modeling the combined string as the source of truth means you cannot answer either question, and it makes the combination space impossible to validate. Note that not every Type/Class pairing exists in the market.

Is a 'safety helmet' a different category from a hard hat?

Not for schema purposes. OSHA 1910.135 and 1926.100 require compliance with ANSI/ISEA Z89.1 regardless of form factor, and there is no separate US standard for climbing-style head protection — a climbing-style helmet sold into US industrial work certifies to Z89.1 Type I or Type II like anything else, sometimes alongside EN 12492. Model the difference with the attributes that actually differ: Brim Style, Chin Strap Configuration, Vented, Shell Weight and ANSI Type. Splitting the category instead just hides half your Type II assortment from the buyers shopping for it.

Which ANSI Z89.1 edition should the record cite?

Cite the designation as marked on the shell. ANSI/ISEA Z89.1-2014 (R2019) is the published edition; R2019 is a reaffirmation, not a revision, so a 2014-marked and a 2014 (R2019)-marked shell are the same standard and should normalize together. A revision has been in development, so keep the field as marked text rather than a boolean — you will need to carry two editions side by side through the transition. Never normalize any of it to 'ANSI approved' or 'OSHA approved'. Neither body approves products: ANSI publishes the standard, OSHA requires conformance to it.

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