Hex nut product attributes

A hex nut record is mostly about compatibility. The nut has to match the bolt's thread size, pitch and class of fit, carry at least the bolt's strength, and allow for any coating on either part. Supplier files typically list size, grade and finish but omit whether a galvanized nut is overtapped, what height it is, and which bolt specifications it is intended to pair with.

Nut style is a frequent source of wrong orders. Finished hex, heavy hex and jam nuts in the same thread size have different widths across flats and heights, so they take different wrenches and carry different loads. Heavy hex nuts are common in structural and high-temperature work, which is why style has to be a governed value rather than a word buried in the description.

Grade designations add another layer. SAE, ASTM and ISO systems overlap in name only, so a nut marked Grade 8 and one marked Class 8 are not substitutes. Recording the full specification, the proof load it is rated for, and the certification available gives a buyer enough to match the nut to the bolt already on the drawing.

The hex nuts attribute template

18 candidate fields in 5 groups, ordered the way a record gets built: identify the item, capture its specifications, then record fit and the evidence behind any claim. 9 are marked Core: without them the item cannot be identified or filtered. Example values show the expected format only; they do not describe a real SKU.

Identity

Which exact item, variant and pack this record describes.

Check before use: Preserve leading zeros and punctuation, validate against the manufacturer record, and check the GTIN check digit and packaging level before linking.

Attribute	Type	Priority	Example format
Manufacturer Part Number manufacturer_part_number	Identifier	Core	HHN-DH-050-HDG

Technical specifications

Measured or rated values that must travel with their unit and test conditions.

Check before use: Store the number and unit separately. Convert only when the source unit and test conditions are known.

Attribute	Type	Priority	Example format
Dia./Thread Size (Nominal) dia_thread_size_nominal	Text	Core	1/2-13
Width Across Flats width_across_flats	Number · in	Core	7/8 in
Nut Height (Thickness) nut_height_thickness	Number · in	Core	31/64 in
Proof Load Stress proof_load_stress	Number · psi	Buyer decision	150,000 psi (A563 DH, hot-dip galvanized)
Hardness hardness	Text · HRC	Buyer decision	24-38 HRC

Selection attributes

The type, material and option choices buyers filter and compare on.

Check before use: Map supplier wording to a governed vocabulary only after checking the source text and which variant it applies to.

Attribute	Type	Priority	Example format
Nut Style nut_style	Controlled list	Core	Heavy Hex
Material material	Controlled list	Core	Medium carbon steel, quenched and tempered
Grade / Property Class grade_property_class	Controlled list	Core	ASTM A563 Grade DH
Finish / Coating finish_coating	Controlled list	Core	Hot-dip galvanized (ASTM F2329)
Overtapped for Coating overtapped_for_coating	Controlled list	Buyer decision	Yes, overtapped for hot-dip galvanizing

Fit & compatibility

What the item mounts to, mates with, replaces or works alongside.

Check before use: Keep model and series qualifiers. A similar-looking part is not a verified fit until a source says so.

Attribute	Type	Priority	Example format
Thread Series / Pitch thread_series_pitch	Controlled list	Core	UNC
Thread Class of Fit thread_class_of_fit	Controlled list	Buyer decision	2B
Thread Direction thread_direction	Controlled list	Buyer decision	Right hand
Mating Bolt Specification mating_bolt_specification	Text	Buyer decision	ASTM F3125 Grade A325

Evidence & compliance

Listings, standards, classifications and origin claims that need a document behind them.

Check before use: Link the manufacturer document or label with its edition or date. Never copy a certification from a neighboring SKU.

Attribute	Type	Priority	Example format
Dimensional Standard dimensional_standard	Controlled list	Channel / evidence	ASME B18.2.2
Country of Melt and Manufacture country_of_melt_and_manufacture	Controlled list	Channel / evidence	Melted and manufactured in USA
Certification Available certification_available	Controlled list	Channel / evidence	MTR, lot traceable (EN 10204 3.1)

Normalize supplier values

The same value arrives in many spellings. Map each raw string to one governed value, and keep the raw text beside it so a reviewer can see what the supplier actually wrote.

Often missing from supplier files

These fields are commonly absent from price lists and basic feeds, even though the information usually exists in a datasheet, label or installation manual. Treat an empty value as a request for evidence, not as permission to fill it from a similar model.

• Overtapped for Coating
• Mating Bolt Specification
• Nut Height (Thickness)
• Thread Class of Fit
• Certification Availability and Melt Origin

Questions the record must answer

Buyers and counter-sales reps choosing hex nuts ask questions like these. Each one needs a specific field, sourced for the exact variant.

• Will this nut thread onto a hot-dip galvanized A325 bolt?
• Is this a heavy hex, and what wrench size does it take?
• Can I get a mill test report with this lot?
• Is this nut strong enough to pair with a Grade 8 bolt?

From supplier file to record

1. Resolve identity first. Link the supplier SKU, manufacturer part number and packaging identifiers without merging distinct variants or pack sizes.
2. Extract with the source attached. Pull values from rows, tables and datasheets, keeping the raw text, unit and page or row reference.
3. Map to your classification. Assign the ETIM, ECLASS, UNSPSC or internal class your company licenses, and keep the supplier's original terms.
4. Review, sync and watch. Hold conflicts and safety-related values for a category expert, write approved values to ERP or PIM, and recheck when the supplier sends a new file.

For the full method, see how to build a category attribute template and the category catalog gap audit.

FAQ