Bolts
High-Tensile Structural Bolts (HSFG) Manufacturer, Wholesaler, Supplier & Exporter
High-Tensile Structural Bolts manufacturer, wholesaler, supplier and exporter from India. Global Fasteners Exports is a trading and export company: our high-tensile structural bolts are made to ASTM A325, ASTM A490, IS 3757, EN 14399 standards by partner factories and supplied to importers, distributors and OEMs in 222+ countries from 5,000 sets, or a half or full container, at competitive prices below the average wholesale price.
Structural steel connections rely on high-strength friction-grip (HSFG) bolt, nut, and washer assemblies rated to precise proof loads. Made by our partner factories, we supply and export these to ASTM A325, ASTM A490, and IS 3757 for steel-structure fabricators and EPC contractors.
High-strength friction-grip bolting works on a principle that surprises people outside structural engineering: the joint doesn't primarily rely on the bolt shank resisting shear at all. Instead, the bolt clamps the connected plates together so tightly that friction between the plates themselves transfers the load — which is why installation torque (or the direct-tension method used to verify it) matters as much as the bolt's material grade.
ASTM A325 and A490 aren't simply 'stronger' and 'even stronger' versions of the same bolt; A490 bolts are not permitted for galvanized coating in the same way A325 bolts are in some applications, due to hydrogen embrittlement risk during the galvanizing process. Structural engineers specify one or the other based on more than raw strength alone, and substituting between them without checking the actual specification can create a code-compliance problem even when the substituted bolt is, on paper, 'stronger'.
Minimum order and container quantity
Minimum order
5,000 sets
or half / full container, as per your requirement
Half container (20ft)
30,000-50,000 sets
Full container (20ft)
60,000-100,000 sets
A standard 20ft container (~20 tons) holds approximately 60,000-100,000 sets of high-tensile structural bolt assemblies (bolt, nut, washers) in common sizes (M16-M20). Exact quantity depends on size and grade and is confirmed at quote time.
The minimum order is 5,000 sets, so you don't need a full container to order: half-container and smaller LCL orders are available as well. Hurain Engitech & Trade — the group Global Fasteners Exports operates under — regularly ships smaller, partial-container (LCL) orders of just a few pallets or boxes for buyers who don't yet need FCL volume, consolidated with other cargo to keep freight cost reasonable.
Specifications
Standards
ASTM A325 (Type 1/3), ASTM A490, IS 3757, EN 14399.
Assembly
Supplied as matched sets — bolt, nut, and hardened washers — to ensure certified proof-load performance.
Size range
M12 to M36 metric; 1/2" to 1 1/2" imperial.
Finish
Plain, hot-dip galvanized, or mechanically galvanized (Type 3 weathering steel on request).
Applications
Structural steel fabrication
Beam, column, and truss connections in buildings and industrial structures.
Bridges & infrastructure
High-load structural connections requiring certified friction-grip assemblies.
Towers & transmission structures
Lattice tower and transmission structure bolting.
Materials Available
Steel
Every assembly is proof-load and hardness tested to ASTM A325/A490 or IS 3757, with mill test certificates supplied for structural sign-off.
How We Supply & Export This Product
- 1
Spec confirmation
Confirm standard, grade, size, and galvanizing requirement from structural drawings.
- 2
Forging & heat treatment
Hot forging followed by quench-and-temper heat treatment to reach the required tensile grade.
- 3
Proof-load testing
Batch proof-load and hardness testing with certification traceable to heat number.
- 4
Export packing
Matched bolt/nut/washer sets, boxed and documented for project-based export shipment.
Export Track Record
Supplied as certified bolt-nut-washer assemblies for structural steel fabrication and EPC project shipments.
Real-World Use Cases
High-rise and industrial steel frames
Beam-to-column and truss connections requiring certified friction-grip performance.
Bridge and infrastructure connections
High-load structural joints in bridges and heavy infrastructure.
Lattice towers and transmission structures
Bolted connections in towers subject to significant wind and dynamic loading.
Common Mistakes Buyers Make
Substituting A490 for A325 without checking the spec
A490 bolts have restrictions (including on galvanizing) that don't apply the same way to A325 — check the actual structural specification before substituting.
Under-torquing a friction-grip connection
The joint relies on clamping force generating friction between plates — under-torqued bolts undermine the entire friction-grip design intent, not just the bolt itself.
Mixing bolts from different heat lots without tracking
Structural sign-off typically requires heat-number traceability — mixing lots without recording it can invalidate the QA paper trail.
Glossary of Terms
- Friction-grip connection
- A bolted joint design where clamping force generates friction between plates to transfer load, rather than relying primarily on bolt shear.
- Direct tension indicator (DTI)
- A washer with crushable protrusions used to verify a structural bolt has reached its specified installation tension.
- Hydrogen embrittlement
- A brittleness that can be introduced into high-strength steel during certain plating or galvanizing processes — a key reason A490 bolts restrict some finishing methods.
Quality Inspection We Perform
Dimensional inspection
Thread gauge, length, diameter, and head/drive geometry checked against the specified standard.
Material verification
Grade and material composition confirmed against the order specification, with mill test certificates on request.
Mechanical testing
Tensile strength, hardness, and proof-load testing on sample batches, particularly for structural and high-tensile grades.
Finish & coating check
Plating thickness, galvanizing coverage, or passivation quality inspected before packing.
HS Code & Customs Classification
Most fasteners fall under HS Chapter 73 (articles of iron or steel) or Chapter 74/76 for brass and aluminum items — the exact 8-10 digit subheading depends on the specific product and material. We include the HS code on the commercial invoice; confirm the applicable import duty with your customs broker, since rates vary by country and trade agreement.
Packaging & Export Labeling
Export packing is chosen to survive ocean freight and container loading without corrosion or damage: corrosion-protected paper or oil coating where needed, then cartons, drums, or bulk bags, palletized or crated for the container. We can match specific labeling, barcoding, or carton-marking requirements for OEM and repeat buyers.
Countries We Export High-Tensile Structural Bolts To
All countries and cities for High-Tensile Structural Bolts →Technical buying guide
How to Choose Structural Bolts: ASTM A325, A490, EN 14399 and IS 3757Structural bolts hold up buildings, bridges, towers and cranes, and they are not sold or inspected like ordinary hex bolts. A structural joint depends on a matched assembly of bolt, nut and washer, all lot-tested…
Buying guide
How to Choose a Reliable High-Tensile Structural Bolts (HSFG) Manufacturer, Wholesaler, Supplier & ExporterWhy structural bolts must be sourced as certified matched assemblies, and the A325/A490 distinction that trips up buyers substituting for cost.
Frequently Asked Questions
Related Products
Competitive export pricing
The best price on high-tensile structural bolts for buyers worldwide
Global Fasteners Exports provides competitive export prices for worldwide customers, below the average wholesale price, because we buy in volume directly from our partner factories. With 16+ years of experience, we are honored to export to 222+ countries and to cooperate with 10,000+ customers around the world. Are you looking for high-tensile structural bolts for your brand or wholesale business worldwide? Global Fasteners Exports is your best choice. Structural bolt assemblies are priced per lot-tested set, and buying the bolt, nut and washers together lowers the cost, with grade, type and galvanizing matched to your project. Minimum order 5,000 pieces, or a half container or a full container as per your requirement. Customized available.
Reviewed by Khalil Syed, Founder, Hurain Engitech & Trade · Last updated
Factory-direct
Priced below the average wholesale rate
16+
Years of experience
222+
Countries we export to
10,000+
Customers worldwide
5,000 sets
Minimum order, or half / full container
About us
Trusted High-Tensile Structural Bolts manufacturer, supplier and exporter from India
Global Fasteners Exports is a trading and export company that supplies high-tensile structural bolts from India, with quality checks, export packing and complete shipping documents.
Our high-tensile structural bolts are manufactured to your grade, size and packing by our partner factories, and we sell and ship them to importers, distributors, OEMs and project buyers. Buying through us means one supplier for high-tensile structural bolts and for the other bolts you need, one inspection and one set of export documents.
16+
Years of experience
40+
Our team
10,000+
Happy customers
26
Fastener product lines
222
Countries we supply
FCL · LCL
Container export, door-to-port
Our vision in India
Our vision is to make sourcing high-tensile structural bolts simple and dependable for every buyer in India and abroad: clear specifications, honest information about who makes the product, and a supplier that answers questions before and after the order.
Our mission in India
Our mission is to supply high-tensile structural bolts at competitive prices, below the average wholesale price, through our partner factories and bulk buying, with transparent quotations, inspection before dispatch and reliable delivery from India. Send your specification and quantity to get a price you can compare.
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