Hot Forging
Large bolt heads and heavy hex profiles are formed for high-load industrial applications.
Large diameter bolt manufacturing
Large Diameter Bolts for Industrial Projects
FASNA manufactures M16-M64 large diameter bolts and 80-1000mm extra long bolts for steel structure, wind power, bridge, petrochemical, power plant, and heavy machinery projects. Procurement teams can request M36, M48, heavy hex, stud, anchor, and custom bolt quotations from one factory-backed supplier.
M36 / M48 Bolts
Extra Long Bolts
Heavy Hex Bolts
Custom Bolts
Anchor Bolts
Key specifications
Production range for large and long bolts
Specifications can be quoted according to international standards, buyer drawings, or project-specific requirements.
| Specification | Available Range | Procurement Notes |
|---|---|---|
| Diameter | M16-M64 | Common requests include M36, M42, M48, M56, and M64 |
| Length | 80-1000mm | Suitable for extra long bolts, anchors, foundations, and equipment assemblies |
| Strength Grade | 4.8 / 8.8 / 10.9 / 12.9 | Quoted according to standard, application, and order requirement |
| Product Type | Hex, heavy hex, stud, anchor, custom bolts | Matched nuts and washers can be included in the quotation |
| Thread | Full thread, partial thread, custom thread length | Thread length should be specified for long bolts and anchor bolts |
| Surface Treatment | Hot dip galvanized, zinc plated, black, dacromet, PTFE | Selected according to corrosion conditions and installation environment |
Manufacturing capability
Factory process from material to packed fasteners
FASNA reviews size, grade, standard, coating, and packing details before confirming production feasibility and quotation.
Heat Treatment
High strength grades are processed according to the required mechanical performance.
Thread Processing
Full thread, partial thread, stud bolt, and long anchor bolt requirements are handled by order.
Surface Treatment
HDG, zinc plating, black finish, dacromet, and PTFE options support different environments.
Applications
Built for load-bearing industrial connections
Large diameter and extra long bolts are typically specified where installation length, joint strength, corrosion protection, and reliable packing are important to project execution.
Steel StructureHeavy hex bolts, nuts, and washers for structural frames.
Wind PowerHigh strength bolts, studs, and long fastener assemblies.
Bridge ProjectsHot dip galvanized large bolts and anchor bolts.
PetrochemicalStud bolts, nuts, washers, and corrosion-resistant finishes.
Power PlantHeavy-duty fasteners for installation and maintenance.
Heavy MachineryCustom bolts for equipment frames and assemblies.
Quality control
Inspection focused on installation reliability
For large bolts and extra long bolts, dimensional consistency and thread quality directly affect site installation. FASNA checks the details that matter before packing.
Sizediameter, length, head dimensions
Threadpitch, thread length, fit check
Gradeorder requirement confirmation
Packingsurface, appearance, labels, crates
Product types
Common large bolt supply categories
These placeholders should be replaced with real product and process photos before launch.
Large Diameter Bolts
M36, M48, and other large sizes for heavy-duty assemblies.
Heavy Hex Bolts
Hot forged heavy head bolts for structural and machinery use.
Extra Long Bolts
80-1000mm length range with custom thread requirements.
High Strength Bolts
Grade 8.8, 10.9, and 12.9 options by requirement.
Coated Bolts
HDG, zinc plated, black, dacromet, and PTFE finishes.
Matched Assemblies
Bolts with nuts, washers, packing, and project labels.
Factory proof
Manufacturing base in Yongnian, Handan, Hebei
Production is backed by Hebei Zhengxiang Fastener Manufacturing Co., Ltd. in Yongnian, Handan, Hebei. Export coordination is handled by Hebei Fasna Import & Export Trading Co., Ltd. for overseas project buyers.
- Large diameter and extra long bolt production focus
- Hot forging, heat treatment, threading, coating, inspection, and packing coordination
- Project quotations reviewed by size, grade, standard, coating, and destination
- Export packing for industrial buyers, distributors, OEMs, and contractors
Send RFQ
Request a factory quotation
Use the form for large diameter bolts, M36 bolts, M48 bolts, extra long bolts, heavy hex bolts, stud bolts, anchor bolts, foundation bolts, or custom fasteners.
- Suitable for procurement managers, distributors, OEMs, contractors, and project buyers
- Matched nuts, washers, surface treatment, and packing can be quoted together
- Drawings and standards help the factory confirm production details faster
RFQ Form
Fast buyer support
Need a quick check before sending drawings?
Send size, length, grade, surface treatment, quantity, destination port, and any drawings by WhatsApp for initial factory review.