Attribute Schema Library
Attribute schemafastener distribution

Threaded Rod Attributes

Threaded rod — all-thread, ready rod, continuous thread stud — is bar stock threaded along its full length, stocked in 1 ft to 12 ft sticks or cut to order. It hangs pipe and strut, bolts up flanges, anchors columns to concrete, and ties concrete forms. The buyers are MRO storerooms, mechanical and electrical contractors, steel fabricators, and refinery maintenance planners, and each one filters on a different half of the spec.

The data is hard for three specific reasons. Variant explosion: thread size × length × material × grade × finish × thread direction × class of fit turns one product concept into thousands of legitimate, differently-priced SKUs, which suppliers send as free-text price-list lines. Standards drift: A193 B7 and F1554 Grade 105 both reach 125 ksi tensile and are not interchangeable on a submittal, and rod under ASME B18.31.3 defaults to a different thread class than a stud under B18.31.2. And the spec that decides the sale — class of fit, coating standard, straightness, cert availability — usually lives in a mill cert or a supplier PDF, never in the line item.

Core

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

Thread Size
enum
1/2"-13

Primary filter facet. Encodes nominal diameter and pitch; 1/2"-13 and 1/2"-20 are different SKUs taking different nuts.

Thread Series
enum
UNC

UNC, UNF, 8UN, metric coarse, Acme and coil rod are different thread forms. 1/2" coil rod runs 6 TPI and accepts only coil nuts.

Overall Length
number · in
144 in (12 ft)

Contractors buy 10 and 12 ft sticks; OEMs buy short cuts. Also sets freight class and whether it ships parcel or LTL.

Rod Configuration
enum
Fully Threaded

Fully threaded rod, double-end stud and tap-end stud share a thread size and are not substitutes at the bench.

Material
enum
316 Stainless Steel

Decides corrosion life and cost. 304 pits in chloride, 316 is the coastal answer, silicon bronze for non-magnetic marine work.

Strength Grade / Class
enum
ASTM A193 Grade B7

The callout the submittal names. Spans ~60 ksi tensile (A307 Gr A) to 125 ksi (A193 B7) and drives allowable load and price.

Finish / Coating
enum
Hot-Dip Galvanized

Zinc plate is ~5 µm of zinc, hot-dip ~50 µm. Wrong pick rusts outdoors — or, on hot-dip, stops a standard nut from running.

Thread Direction
enum
Right-Hand

Turnbuckles, tensioners and adjusters need left-hand. Right-hand is assumed, so left-hand rod is invisible unless modelled.

Manufacturer Part Number
identifier
U55067.075.1200

Anchors cross-reference to Grainger, Fastenal and MSC equivalents and lets a buyer paste a competitor's number into search.

GTIN / UPC
identifier
00812345678905

Required to list on Amazon Business and to match across data pools. Rod sold by the stick often has no barcode assigned.

Country of Origin
enum
United States

Drives tariff classification and Buy America eligibility. Distinct from where the steel was melted, which DFARS asks for.

Differentiating

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

Thread Class (Fit)
enum
Class 2A

ASME B18.31.3 furnishes Class 1A unless 2A is specified; B18.31.2 studs must be 2A. Submittals name a class, so records must carry it.

Minimum Tensile Strength
number · psi
125,000 psi

Lets an engineer size the rod. Diameter-dependent: B7 is 125 ksi min through 2-1/2", 115 ksi above — carry the size band.

Minimum Yield Strength
number · psi
105,000 psi

F1554 grades are literally named by yield — 36, 55, 105 ksi. Without it the grade number does not resolve to an allowable load.

Maximum Service Temperature
number · °F
800 °F

A193 B7 is medium-high-temperature bolting; A307 is generally not used above 400°F. Flange and steam work turns on this.

Compliance & identifiers

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

Specifications Met
enum
ASTM A193/A193M; ASME B18.31.3

The field submittals and QA check against. Dimensional and material standards are separate callouts and both belong on the record.

Coating Specification
enum
ASTM F2329

'Galvanized' is not a spec. F2329 hot-dip and F1941 electroplate differ ~10x in zinc thickness and in whether nuts must be oversize.

Domestic / DFARS Compliant
boolean
true

Defense and federal work requires specialty metal melted in the US or a qualifying country, evidenced on the cert by heat number.

The fields that aren't in the schema at all

What most threaded rod 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.

Competitor signal
+ Thread Class (Fit)

McMaster-Carr exposes Thread Fit as a filter on threaded rods with Class 1A, 2A and 3A values. Most distributor rod listings publish no thread class at all, so the facet cannot be built.

Rod furnished as Class 1A against a submittal calling for 2A. Submittal rejected, material returned, and the RFQ goes to whoever could state the class.

Supplier signal
+ Coating Specification

Catalogs list 'Galvanized' with no standard behind it. That one word covers ASTM F1941/B633 electroplate at roughly 5 µm and ASTM F2329 hot-dip at roughly 50 µm.

Zinc-plated rod ships for coastal or buried service and rusts in a season. Or F2329 rod ships with standard nuts that will not run over the zinc.

Review signal
+ Straightness Tolerance

ASME B18.31.3 publishes no straightness value — it is agreed purchaser-to-supplier. Buyers ask how much bow to expect in a 12 ft stick and no listing answers it.

Bowed 10 and 12 ft sticks rejected at the jobsite. Return freight on long bundles often exceeds the value of the rod itself.

Search signal
+ Mill Test Report / Heat Number Availability

Buyers search 'B7 threaded rod with MTR' and 'DFARS threaded rod'. Cert availability and melt country are almost never a field, so search returns the whole grade undifferentiated.

Order placed, then cancelled when the cert cannot be produced with heat traceability. Defense and nuclear work walks before it reaches a quote.

Marketplace signal
+ Thread Direction

Fastenal's rod rail counts hundreds of right-hand SKUs against roughly ten left-hand. Most catalogs model no direction at all, so left-hand rod is effectively unsearchable.

Turnbuckle and tensioner buyers cannot self-serve left-hand rod. The line drops to a counter call, or to a competitor whose filter has the value.

How Schema Foundry finds these

Messy in, governed out.

The same value, spelled every way fastener distribution suppliers spell it. A filter only works once they agree.

Finish / Coating
HDGHot Dip Galv.GalvanizedHot-Dipped GalvanizedZinc Plated GalvanizedGalv HD
Hot-Dip Galvanized (ASTM F2329)

'Galvanized' alone hides ~5 µm electroplate vs ~50 µm hot-dip. Coastal and buried service filter on exactly that difference.

Thread Size
1/2-131/2"-130.500-131/2 IN-13 UNC1/2-13UNC-2A.5-13
1/2"-13

Thread size is the primary rail. Six spellings mean six dead facet buckets and a buyer who cannot filter to a stocked size.

Strength Grade / Class
B7A193 B7ASTM A193 Gr. B7A193/A193M B7Gr B7 AlloyB-7
ASTM A193 Grade B7

B7 and F1554 Gr 105 both reach 125 ksi tensile but are not interchangeable on a submittal. The full callout has to survive.

Material
SS316316 SSA4T-316316 StainlessUNS S31600
316 Stainless Steel

A4 (metric) and 316 (inch) name near-identical chemistry from different standards. Buyers filter one rail, not two.

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 2A thread or 1A? My submittal calls out 2A.
  • Will a standard nut run on this after hot-dip galvanizing, or do I need an oversize tap?
  • Can I substitute F1554 Grade 105 for A193 B7? Both say 125 ksi.
  • Do you stock this in left-hand thread for a turnbuckle?
  • Can you send the MTR with heat number, and was the steel melted in the US?
  • How much bow should I expect out of a 12 ft stick?
  • Is B7 rod good at 700°F for a flange bolt-up?
  • 304 or 316 for outdoor coastal — is 304 going to pit on me?

What channels require

The same SKU, different mandatory fields per destination.

Distributor's own faceted catalog
Thread SizeThread SeriesOverall LengthMaterialStrength Grade / ClassFinish / Coating
Amazon Business
GTIN / UPCManufacturer Part NumberThread SizeMaterialOverall LengthCountry of Origin
Punchout catalogs (Ariba, Coupa, Jaggaer)
Manufacturer Part NumberThread SizeOverall LengthMaterialStrength Grade / ClassCountry of Origin
Construction submittal package
Specifications MetStrength Grade / ClassThread Class (Fit)Coating SpecificationMinimum Yield Strength

Threaded Rod data, in practice

What's the difference between threaded rod and a continuous thread stud?

Dimensionally they are different products under different ASME standards. Threaded rods (inch series) are covered by ASME B18.31.3; continuous thread and double-end studs by ASME B18.31.2. The practical consequence is thread class: B18.31.3 furnishes Class 1A for UNC and UNF unless another class is specified, while B18.31.2 studs are required to meet Class 2A. So a 1/2"-13 B7 'rod' and a 1/2"-13 B7 'stud' can carry the same grade, size and finish and still fail the same submittal. If a catalog collapses the two into one record, it has lost the only field that distinguishes them.

Why does 'Galvanized' need a specification on the record?

Because the word names two coatings that behave differently. Zinc electroplating to ASTM F1941 (B633 on the nuts) puts on roughly 5 µm of zinc — an indoor finish. Hot-dip galvanizing to ASTM F2329 puts on roughly 50 µm and survives outdoors, buried and coastal. The thickness also changes assembly: F2329 does not permit chasing threads after galvanizing, so hot-dip rod is built to run with oversize-tapped nuts. A record that says only 'Galvanized' cannot tell a buyer whether the rod lasts outdoors, and cannot tell them which nut to order with it.

Which standards genuinely apply to threaded rod?

Dimensional: ASME B18.31.3 (inch threaded rods), ASME B18.31.2 (continuous thread and double-end studs), DIN 975 and DIN 976 (metric rod). Thread form: ASME B1.1 (inch), ASME B1.13M (metric). Material and mechanical: ASTM A307 Grade A for low-carbon rod, ASTM A193/A193M for B7, B8 and B8M, ASTM F1554 Grades 36/55/105 for anchor rods, ASTM F593 for stainless, ISO 898-1 classes for metric. Coating: ASTM F2329 (hot-dip), ASTM F1941 (electroplate). Standards that do not belong on a rod record: UL, NSF, NEMA, ATEX. If a supplier PDF claims one, it is an assembly-level claim, not a rod claim.

How do you keep the variant count under control?

You don't reduce it — you model it. One product concept, 1/2"-13 all-thread, legitimately spans A307 Grade A, A193 B7, F1554 Grade 55, 304 and 316, across plain, zinc-plated and hot-dip finishes, in 3, 6, 10 and 12 ft sticks plus cut lengths, in right- and left-hand, at Class 1A or 2A. Every one of those is a real, orderable, differently-priced item. The failure mode is not too many SKUs — it is SKUs whose distinguishing attributes are stranded in free-text descriptions, so the facet rail can only expose size and length and the buyer has to call the counter to resolve the rest.

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