Materials and grades
Match the requirement to the assembly.
Carbon steel (SAE 1010/1045 ) SAE J429 Gr.5 / ASTM A307 Gr.A / 8.8 grade These references require written confirmation for the requested dimensions and quantity.
Hex Bolts · MR-003
Inch-series hex bolts
ASME B18.2.1 (inch-series hex bolt / heavy hex bolt)
The inch-series route needs a clear UNC or UNF thread designation and must remain separate from metric dimensions.
Reference dimensionsMetric reference: — (Inch-series); Inch reference: 1/4"-2 1/2", : 1/4"-20 UNC, 5/16"-18 UNC, 3/8"-16 UNC, 1/2"-13 UNC, 5/8"-11 UNC, 3/4"-10 UNC, 7/8"-9 UNC, 1"-8 UNC; Length reference: 1/2"-12" ( 3/4"-6")
Material / gradeCarbon steel (SAE 1010/1045 ) · SAE J429 Gr.5 / ASTM A307 Gr.A / 8.8 grade
Index-ready review · MARKET REFERENCE ONLY
Reference information only. Final supply options are subject to supplier confirmation.
Product overview
A focused starting point for procurement.
External-hex fastening inquiries are usually won or lost on thread form, grip length and the governing metric or inch standard. The inch-series route needs a clear UNC or UNF thread designation and must remain separate from metric dimensions. This page is a market-reference starting point for a specification-led inquiry, not a statement of stock, supply capacity or a fixed manufacturing source.
Separate partial-thread and full-thread requirements before comparing offers. A matching nominal diameter does not make the two forms interchangeable. Coating choice depends on the service environment, dimensional allowance and the buyer's corrosion requirement. Confirm the coating system and test basis in the RFQ.
HEXVARO is a China-based sourcing and coordination brand. The page does not claim factory ownership, stock, price, MOQ, lead time, certification or a fixed supplier relationship. Final supply options are subject to supplier confirmation.
Applicable standards
State the exact standard and revision.
The standard reference below is an inquiry anchor. It is not a claim that all listed dimensions, grades or finishes are available.
Reference Specifications
Use reference data to make the RFQ specific.
These are common inquiry specifications from the market-reference record. They are not an Available Sizes table and do not create a combined catalogue of materials, grades, dimensions or finishes.
| Reference | Inquiry geometry | Material / grade / finish | Mating components | Status |
|---|---|---|---|---|
| Reference 1 | ASME B18.2.1 · inch · 3/8"-16 × 2" · UNC 16 · Partial thread | Medium-carbon steel · Grade 5 · Zinc plated | For ASME B18.2.2 Gr.5Nut | REFERENCE ONLY |
| Reference 2 | ASME B18.2.1 · inch · 1/2"-13 × 2-1/2" · UNC 13 · Partial thread | Medium-carbon steel · Grade 5 · Zinc plated | For ASME B18.2.2 Gr.5Nut | REFERENCE ONLY |
| Reference 3 | ASME B18.2.1 · inch · 3/4"-10 × 4" · UNC 10 · Partial thread | Medium-carbon steel · Grade 5 · Zinc plated | For ASME B18.2.2 Gr.5Nut+F436Washer | REFERENCE ONLY |
Each row is a reference inquiry example. Final supply options are subject to supplier confirmation; the source workbook contains no completed factory confirmation or evidence path for these rows.
| Field | Reference or buyer input | Status |
|---|---|---|
| SKU | MR-003 | REFERENCE ONLY |
| Reference dimensions | Metric reference: — (Inch-series); Inch reference: 1/4"-2 1/2", : 1/4"-20 UNC, 5/16"-18 UNC, 3/8"-16 UNC, 1/2"-13 UNC, 5/8"-11 UNC, 3/4"-10 UNC, 7/8"-9 UNC, 1"-8 UNC; Length reference: 1/2"-12" ( 3/4"-6") | BUYER CONFIRMATION REQUIRED |
| Material options | Carbon steel (SAE 1010/1045 ) | BUYER CONFIRMATION REQUIRED |
| Grade reference | SAE J429 Gr.5 / ASTM A307 Gr.A / 8.8 grade | BUYER CONFIRMATION REQUIRED |
| Surface finish reference | Zinc plated / Hot-dip galvanized / | BUYER CONFIRMATION REQUIRED |
| Supply status | Supplier, stock, price, MOQ and lead time are not established by this page. | UNCONFIRMED |
Final supply options are subject to supplier confirmation.
RFQ Specification Checklist
Send the details that make comparison useful.
The buyer remains responsible for the actual dimensions, material, grade, finish, quantity, destination and document requirement.
- Product: Inch-series hex bolts
- SKU: MR-003
- Standard reference: ASME B18.2.1 (inch-series hex bolt / heavy hex bolt)
- Actual dimensions, material, grade, surface finish, quantity, destination and required documents must be confirmed by the buyer
- Required inspection, traceability, packaging and labelling documents
- Any drawing number, revision, accepted deviation or installation requirement
Technical review
Keep special standards and assemblies separate.
Content is structured for indexing review. Supplier availability remains unconfirmed.
The inch-series route needs a clear UNC or UNF thread designation and must remain separate from metric dimensions.
Technical documents, samples, inspection requirements and conformity records are reviewed only for the specific inquiry and selected source.
Technical FAQ
Clarify the requirement before comparing offers.
Should a metric and inch hex bolt be treated as equivalent?
No. Thread system, pitch or thread series, dimensions and the governing standard must be confirmed independently.
What separates partial-thread and full-thread inquiries?
The buyer should state the required grip length, thread length and joint geometry. The page does not assume that one form can replace the other.
What does this MR-003 page confirm?
It organizes a product-specific inquiry. It does not confirm inventory, supplier relationship, price, MOQ, lead time, certification or delivery.
What should be stated with ASME B18.2.1 (inch-series hex bolt / heavy hex bolt)?
State the exact revision, dimensions, material or grade, finish, quantity, destination and required documents. The inch-series route needs a clear UNC or UNF thread designation and must remain separate from metric dimensions.
Related products
Follow the technical relationship.
Hex Bolts · MR-003 inquiry
Have a part to source?
Send the controlled RFQ.
Product name, SKU, standard reference and source URL are carried into the form so you can edit the actual dimensions, material, grade, finish, quantity, destination and document requirements.
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