Hex Bolts
Custom sizes and alloy grades for industrial assemblies.
Custom Size
Multiple Alloys
CHENGGE FASTENER
OEM / ODM Manufacturing
Specialty Alloy Fasteners Manufacturer Based in China
High-temperature, high-strength and corrosion-resistant fasteners in nickel alloys, duplex stainless steel, titanium and special materials for oil & gas, power, aerospace and marine engineering.
ISO 9001
MTC / EN 10204 3.1
Custom Manufacturing
Manufacturing Capability
Standard and custom fasteners manufactured in stainless steel, duplex stainless steel, nickel alloys, titanium alloys and high-strength alloy steels.
Specialty Alloy
Fastener Solutions
Heavy Hex Bolts
For high-load, high-temperature and pressure equipment.
High Load
Special Materials
Stud Bolts
For flanges, valves, pressure vessels and piping systems.
Matched Nuts
Custom Length
Threaded Rods
Custom lengths, threads and material grades available.
Custom Length
Special Thread
Socket Screws
Precision screws for compact and high-strength assemblies.
Precision Machining
Custom Grade
Nuts
Matched nuts produced according to bolt material and strength.
Matched Sets
Traceability
Washers
Flat washers and custom washers available for complete fastener sets.
Matched Sets
Traceability
Custom Drawing-Based Fasteners
Non-standard fasteners manufactured according to drawings or samples.
Drawing-Based
Non-Standard
Production & Documentation Capability
Sizes
M6-M64 / 1/4"-3"
Custom sizes available
Threads
Metric / UNC / UNF
Coarse, fine and custom pitch
Standards
ASME / DIN / ISO
ASTM / AMS material specs, custom drawings available
Documents
MTC / EN 10204 3.1
Heat No. traceability; PMI available on request
Marking
Grade & Heat No.
Custom marking available
Packaging
Export Packing
Project labeling and anti-rust protection
Need a product type not shown here?
We also manufacture custom and project-specific fasteners according to drawings, specifications or application requirements.
Available Material Families
Each product type can be manufactured in different specialty alloy materials according to project requirements.
Super Austenitic Stainless Steel
Duplex & Super Duplex Stainless Steel
Nickel Alloys
Titanium & Titanium Alloys
High-Temperature & Stabilized Austenitic Stainless Steel
Material Grade Capability
Traceability Support: EN 10204 3.1 MTC Available
| Material Family | Common Grades | Typical Service Conditions |
|---|---|---|
| Super Austenitic Stainless Steel | 254SMO / 904L / 1.4529 / N08925 / N08926 | Chloride and seawater corrosion |
| Duplex & Super Duplex Stainless Steel | 2205 / 2507 / F51 / F53 / F55 | High strength and corrosion resistance |
| Nickel Alloys | Inconel 625 / Inconel 718 / Inconel X-750 / Hastelloy C276 / Monel 400 / Monel K500 | High temperature and severe corrosion |
| Titanium & Titanium Alloys | TA2 / TC4 / TB3 | Lightweight and corrosion resistance |
| High-Temperature & Stabilized Austenitic Stainless Steel | 304H / 304N / 316Ti / 321 / 347 / 347H | Elevated temperatures and sensitization resistance |
Your Trusted Partner
Why Choose Chengge
Chengge focuses on specialty alloy fasteners for demanding industrial applications, combining material expertise, custom manufacturing and quality control to support global industrial projects.
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Specialty Alloy Expertise Focused on stainless steel, duplex steel, nickel alloys, titanium and alloy steels.
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Custom Manufacturing Capability Standard and drawing-based fasteners made to project requirements.
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Material Traceability Heat numbers and batch records tracked from material to shipment.
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Matched Fastener Sets Bolts, studs, nuts and washers supplied as complete matched sets.
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Strict Quality Control PMI, dimensions, threads and final inspection checked by batch.
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Export Documentation Support MTC, inspection reports and export documents available on request.
Global Market Coverage
Application Industries
Chengge fasteners perform reliably across the world's most demanding industrial sectors, from deep-sea platforms to power turbines.
Oil & Gas
Petrochemical
Power Generation
Marine & Offshore
Aerospace
Rail Transit & Defense
MANUFACTURING & QUALITY
FROM SAMPLE TO QUALITY ASSURED DELIVERY
Manufacturing Process
Manufacturing Process
& Quality Assurance
A complete system covering machining, heat treatment, inspection and quality control ensures traceable, repeatable results at every stage.
Manufacturing Process
01
Material Selection
Certified alloys with mill test reports and PMI verification.
02
Forming & Machining
Cold heading, hot forging, CNC turning and thread rolling.
03
Heat Treatment
Solution and quench & temper for consistent mechanical properties.
04
Surface Finishing
Coating, passivation and finish per project specifications.
05
Inspection & Delivery
Full dimensional, thread and mechanical testing before shipment.
100% Quality Assurance
In-house laboratory performs rigorous testing for every batch.
- PMI Test
- Dimensional Check
- Thread Inspection
- Hardness Test
- Mechanical Testing
Quality Control Capabilities
PMI Test
Alloy composition verified by positive material identification.
Tensile Testing
Tensile and yield strength validated per batch before shipment.
Thread Inspection
Thread gauge inspection for metric, UNC, UNF and custom threads.
Hardness Test
Rockwell / Brinell / Vickers hardness testing after heat treatment.
Mechanical Testing
Comprehensive mechanical performance testing on every production batch.
Material certificates, inspection reports and batch traceability documents available per project requirements · ISO 9001 Certified
About Chengge
A Leading High-End Fastener Manufacturer
Based in China, Chengge specializes in the production and supply of high-end fastening solutions for high-temperature, high-strength and corrosion-resistant critical service applications. With years of OEM / ODM experience, we serve brand owners, engineering contractors, distributors and equipment manufacturers worldwide.
We manufacture bolts, stud bolts, screws, nuts, washers, pins and special-shaped precision parts, backed by a complete system covering machining, heat treatment, inspection and strict ISO 9001 quality control.
50+
Alloy Grades
10+
Industries Served
Global
Market Reach
FAQ
Frequently Asked Questions
Common questions about specialty alloy fasteners, custom manufacturing, materials, inspection and quotation requirements.
Do you manufacture standard and custom fasteners? +
Yes. We manufacture standard fastener types as well as custom drawing-based fasteners according to customer specifications.
What materials can you manufacture? +
We manufacture fasteners in stainless steel, duplex stainless steel, nickel alloys, titanium alloys and high-strength alloy steels.
Can you produce according to drawings? +
Yes. We can produce non-standard sizes, special threads, special head types and custom fasteners according to drawings or samples.
What product types do you supply? +
We supply hex bolts, heavy hex bolts, stud bolts, threaded rods, socket screws, nuts, washers and custom fastener parts.
Can you provide matched bolt, nut and washer sets? +
Yes. Bolts, studs, nuts and washers can be supplied as matched sets according to material and project requirements.
Do you keep finished products in stock? +
Most specialty alloy fasteners are custom manufactured. We usually do not keep full finished stock for all sizes and grades.
What information is needed for quotation? +
Please provide material grade, product type, size, thread, quantity, standard or drawing, surface treatment and certificate requirements.
Can you provide material certificates? +
Yes. Mill Test Certificates, EN 10204 3.1 MTC and inspection reports can be provided according to project requirements.
What quality inspections are available? +
PMI, dimensional inspection, thread inspection, hardness test, appearance check and final batch inspection are available.
What is your typical lead time? +
Lead time depends on material grade, size, quantity and production process. Custom fasteners usually require confirmation after technical review.
Have a specific requirement? Send us your drawing, material grade and quantity -- we will review and respond with a detailed quotation.
Request a Quote
Request For Quotation
SPECIALTY ALLOY FASTENERS,
Direct from Manufacturer.Send us your specifications, standards, or drawings. Our engineering team will review your requirements and provide a detailed quote within 12 hours.
ISO 9001
EN 10204 3.1
Global Shipping
Get Your Quote
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