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العربية ASTM A490 heavy hex structural bolts factory
XZ Fastener supplies ASTM A490 heavy hex structural bolts for factory orders where buyers need higher-strength bolting, controlled heavy hex geometry, project-ready packing, and careful specification review. A490 bolts are used for structural steel connections in bridges, towers, heavy industrial frames, crane structures, and other demanding steel assemblies. Orders can be reviewed against legacy ASTM A490 callouts or ASTM F3125 Grade A490 requirements according to the project document. Plain, oiled, black oxide, and Type 3 weathering steel options can be discussed, while zinc coating must be reviewed carefully against the applicable specification and project approval.
Quick Specs
What Buyers Should Know Before Sourcing ASTM A490 Heavy Hex Structural Bolts
ASTM A490 heavy hex structural bolts are used where a project calls for higher-strength structural bolting than standard structural bolt grades. Many older drawings still mention ASTM A490, while newer documents may reference ASTM F3125 Grade A490. Buyers should confirm the applicable project specification, bolt type, diameter, length, thread length, head marking, finish limitation, matching nut grade, washer requirement, and required inspection documents.
When a project list includes other industrial bolts, do not treat A490 as a direct substitute for lower-strength bolts without engineer approval. Nut and flat washers should be checked as an assembly before factory production.
Common Purchasing Descriptions
Typical structural bolt descriptions
- ASTM A490 heavy hex structural bolts, Type 1, plain finish, UNC thread
- ASTM F3125 Grade A490 heavy hex structural bolts with matching nuts and washers
- A490 structural bolt assembly, heavy hex head, project length schedule
- A490 Type 3 weathering steel structural bolts for bridge and exposed steel structures
Related purchasing terms
Steel construction buyers may order A490 bolts together with standard fasteners for project stock or maintenance supply. Related terms may include DIN 933 full thread hex bolts, Grade 8.8 carbon steel hex bolts, metric hex head bolts, zinc plated DIN 933 bolts, black oxide DIN 933 bolts, and hot dip galvanized DIN 933 bolts.
Detailed Specifications Table
| Item | Available Options | Buyer Notes |
|---|---|---|
| Product Name | ASTM A490 heavy hex structural bolts / ASTM F3125 Grade A490 bolts | Confirm whether the project uses a legacy A490 callout or current F3125 Grade A490 wording. |
| Head Type | Heavy hex structural bolt head | Head dimensions and markings should match the applicable project specification. |
| Diameter | Common inch sizes such as 1/2 in to 1-1/2 in; other sizes by review | Provide exact diameter and unit system to avoid confusion with metric structural bolts. |
| Length | Project-specific lengths according to structural connection list | Confirm grip length, washer use, nut engagement, and projection requirement. |
| Thread | UNC thread is commonly specified; other thread details by drawing | Thread length should be checked against the joint design and project document. |
| Type | Type 1 alloy steel, Type 3 weathering steel, or other project-specified option | Type 3 is used when weathering steel behavior is required by the project design. |
| Finish | Plain, oiled, black oxide, Type 3 weathering steel; coating by technical review | Zinc coating should not be assumed for A490; confirm project acceptance and applicable limits before quoting. |
| Assembly Components | Bolts only, or bolts with matching heavy hex nuts and structural washers | Provide assembly requirement clearly so quotation includes the correct components. |
| Packing | Bulk cartons, wooden cases, pallets, size-separated packing, project labels | Carton marks, heat or lot labels, project part numbers, and barcode labels can be arranged according to order requirement. |
| Inspection | Dimensional check, thread check, finish review, marking check, mechanical inspection as required | Inspection documents and test reports can be supplied according to order requirement. |
Material and Grade Explanation
A490 bolts are selected for higher-strength structural connections, so grade control and project compliance are critical. Buyers should share the exact standard wording, project drawing, and assembly requirements before comparing quotations.
Type 1 Alloy Steel
Type 1 A490 bolts are typically specified as alloy steel heavy hex structural bolts for demanding steel connections. The material route, heat treatment, head marking, and mechanical performance should be reviewed according to the applicable project document.
Type 3 Weathering Steel
Type 3 A490 bolts are selected when the project requires weathering steel behavior. Buyers should confirm whether matching nuts and washers must also meet weathering steel requirements, especially for exposed bridges, towers, and outdoor steel frames.
Surface Finish Selection Guide
Finish selection for A490 bolts must be handled carefully because high-strength bolts can be sensitive to coating processes. The project specification should decide whether a finish is acceptable; do not copy finish choices from A325 or ordinary heavy hex bolts without review.
| Finish | Typical Use | Procurement Comment |
|---|---|---|
| Plain / Oiled | Protected structural steel applications and many A490 project requirements | Common supply route when the project does not require a corrosion-protective coating. |
| Black Oxide / Oiled | Projects requiring darker appearance with temporary corrosion protection | Confirm acceptance by project document and storage conditions before purchase. |
| Type 3 Weathering Steel | Weathering steel bridges, towers, and exposed steel frames | Used when the structure is designed for weathering steel components. |
| Zinc Coating | Only when specifically permitted by applicable project documents | Zinc coating for A490 should be reviewed carefully because of high-strength bolt requirements and hydrogen embrittlement concerns. |
| Special Coating | Project-specific corrosion or friction requirement | Review through coated fasteners support when the drawing or purchase order requires a qualified coating. |
Manufacturing and Quality Control
For A490 heavy hex structural bolt factory orders, control should cover alloy steel material, forming, heat treatment, thread accuracy, surface condition, head marking, and packing separation. Inspection requirements should be agreed before production, especially when project documents require specific test reports.
Manufacturing Focus
- Material selection reviewed against A490 or ASTM F3125 Grade A490 project wording
- Heavy hex head forming with project-required head marking
- Thread processing controlled for nut engagement and assembly fit
- Heat treatment and mechanical performance reviewed according to order requirement
- Finish route selected according to project limits and coating restrictions
Inspection Focus
- Dimensional checks for diameter, length, thread, head size, and bearing surface
- Thread gauge check and nut assembly fit review when supplied as a set
- Head marking, heat information, and lot identification review
- Surface condition, finish appearance, and size separation check
- Inspection documents available upon request according to order requirement
If the project needs special length, special marking, private labels, or combined bolt assemblies, XZ Fastener can review the requirement through custom fasteners support.
Applications
ASTM A490 heavy hex structural bolts are used in demanding steel connections where higher-strength bolting is specified by the project engineer. Final use should follow the approved project drawing, site specification, and installation procedure.
How to Get a Faster Quotation
A490 structural bolt quotations depend on exact project requirements. A complete inquiry helps confirm the grade, assembly components, acceptable finish, packing method, inspection scope, and production route. Buyers can also include other fastener products in the same list for project supply review.
- Standard: ASTM A490 legacy callout or ASTM F3125 Grade A490, plus project specification if available.
- Type: Type 1 alloy steel, Type 3 weathering steel, or other specified project requirement.
- Size list: diameter, length, thread length, quantity per size, and unit system.
- Assembly: bolts only, or bolts with matching nuts and washers.
- Finish: plain, oiled, black oxide, Type 3 weathering steel, or project-approved coating.
- Packing: carton or case quantity, pallet method, size separation, project labels, and heat or lot marking needs.
- Inspection: dimensional report, mechanical test report, finish requirement, marking confirmation, or other documents.
For a factory quotation, contact XZ Fastener with your size list, finish, quantity, packaging, inspection requirements, and destination details.
FAQ
Can ASTM A490 heavy hex structural bolts be supplied from factory production?
Yes. Factory orders can be reviewed by standard wording, bolt type, diameter, length, finish, quantity, nut and washer requirement, packing method, destination, and inspection documents. Project drawings or specifications are recommended.
Should I order ASTM A490 or ASTM F3125 Grade A490?
Many older drawings still mention ASTM A490, while newer documents may use ASTM F3125 Grade A490. Buyers should follow the project specification and share the exact wording in the inquiry so the quotation can be reviewed correctly.
Can A490 bolts be supplied with nuts and washers?
Yes. Bolts can be quoted alone or as assemblies with matching heavy hex nuts and structural washers. The buyer should confirm the required nut grade, washer type, finish, and packing method.
Can ASTM A490 bolts be hot dip galvanized?
Zinc coating for A490 bolts should not be assumed. Buyers should review the current project specification and applicable standard requirements because high-strength A490 bolts can have coating restrictions related to hydrogen embrittlement risk.
What inspection documents can be requested?
Dimensional checks, marking confirmation, thread fit review, finish inspection, mechanical test reports, and other documents can be discussed according to order requirement. State the required documents before production.
What details are needed for a fast quotation?
Please send the standard, type, diameter, length, thread, finish, quantity, nut and washer requirement, packaging method, inspection requirements, destination country, and destination port. A project drawing or bolt schedule is very helpful.
Send Your A490 Structural Bolt Requirement
For ASTM A490 heavy hex structural bolts, send your size list, finish, quantity, packaging method, nut and washer requirement, inspection requirements, project specification, carton label needs, and delivery destination. XZ Fastener will review the details and respond with practical factory supply options according to order requirement.