Excellent Corrosion Resistance
Incoloy alloys provide strong resistance to general corrosion, pitting, crevice corrosion and stress corrosion cracking in demanding process environments.
Specialty Alloy Fasteners
Incoloy Fasteners Manufacturer
High-performance Incoloy bolts, stud bolts and custom fasteners engineered for oil & gas, chemical and highly corrosive industrial applications.
Incoloy Alloy Expertise
Alloy 825 and 925 fasteners for corrosion-resistant and high-strength industrial applications.
Corrosion & Sour-Service Performance
Reliable resistance to chlorides, reducing acids and demanding oil & gas environments.
Custom Manufacturing
Standard and drawing-based Incoloy fasteners manufactured to project-specific dimensions and requirements.
Overview
Incoloy Fasteners for Corrosive & High-Strength Environments
Incoloy alloys are nickel-iron-chromium materials developed to provide reliable performance in corrosive industrial environments while maintaining useful mechanical strength. Alloy 825 is primarily selected for its resistance to reducing and oxidizing acids, chloride stress corrosion cracking, pitting and crevice corrosion. Its molybdenum and copper additions make it particularly useful in sulfuric and phosphoric acid environments. Alloy 925 builds on similar corrosion-resistant chemistry while adding titanium and aluminum for age hardening. This provides substantially higher mechanical strength for demanding oil & gas, marine and high-load fastening applications.
Why Choose This Material
Why Incoloy Is Selected for Critical Fastening Applications
Incoloy combines corrosion resistance, chloride performance and high-strength grade options for fastening systems in demanding industrial environments.
Strong Chemical Resistance
Nickel, molybdenum and copper provide useful resistance to sulfuric acid, phosphoric acid and other reducing chemical environments.
Reliable Oil & Gas Performance
Selected Incoloy grades provide reliable performance in sour-service, downhole and surface oil & gas equipment.
High-Strength Grade Option
Age-hardenable Alloy 925 provides substantially higher strength than Alloy 825 while maintaining excellent corrosion resistance.
Incoloy Grades Available for Fasteners
Alloy 825 and Alloy 925 provide different combinations of corrosion resistance and mechanical strength for demanding fastening applications.
Incoloy Alloy 925
UNS:
N09925
Standards
- ASTM B805
- ASTM B637
- NACE MR0175
- ISO 15156
Characteristics
- High mechanical strength
- Excellent corrosion resistance
- Age-hardenable nickel-iron-chromium alloy
Applications
Oil & gas, Sour-service equipment, Marine systems, High-strength piping
Incoloy Alloy 825
UNS:
N08825
EN / W.Nr.:
2.4858
Standards
- ASTM B425
- ASTM B564
- NACE MR0175
- ISO 15156
Characteristics
- Excellent general corrosion resistance
- High resistance to pitting and crevice corrosion
- Good chloride SCC resistance
Applications
Chemical processing, Oil & gas, Acid production, Pollution control
Other Incoloy Grades Available
Additional Incoloy grades can be reviewed according to customer drawings, project specifications and specific service requirements.
Chemical Composition of Incoloy Alloys
Compare the principal alloying elements of Alloy 825 and Alloy 925 and the compositional differences that influence corrosion resistance and strength.
| GRADE | NI (%) | CR (%) | FE (%) | MO (%) | CU (%) | TI (%) | C (%) | OTHER (%) |
|---|---|---|---|---|---|---|---|---|
| Alloy 825 / N08825 | 38.0–46.0 | 19.5–23.5 | 22.0 min | 2.5–3.5 | 1.5–3.0 | 0.6–1.2 | 0.05 max | Al 0.20 max, Mn 1.0 max, Si 0.50 max |
| Alloy 925 / N09925 | 42.0–46.0 | 19.5–22.5 | 22.0 min | 2.5–3.5 | 1.5–3.0 | 1.9–2.4 | 0.03 max | Al 0.1–0.5, Nb 0.50 max, Mn 1.0 max |
Reference values are provided for general comparison only. The governing material specification and batch MTC take precedence for production and acceptance.
Mechanical Performance of Incoloy Alloys
Alloy 825 provides reliable general-purpose strength, while age-hardened Alloy 925 delivers substantially higher tensile and yield performance.
| GRADE / CONDITION | TENSILE STRENGTH (MPA) | 0.2% YIELD STRENGTH (MPA) | ELONGATION (%) |
|---|---|---|---|
| Alloy 825 — Annealed Bar | Approx. 690 | Approx. 324 | Approx. 45 |
| Alloy 925 — Solution Annealed & Aged Round | Approx. 1154 | Approx. 832 | Approx. 27 |
Mechanical properties depend on product form, dimensions, material condition, heat treatment and the applicable specification. The purchase specification and actual inspection certificate shall govern the order.
Incoloy Grade Selection Guide
Choose Alloy 825 where corrosion resistance is the main requirement, and Alloy 925 where higher mechanical strength is also required.
| Application Requirement | Recommended Grade |
|---|---|
| General corrosion resistance | Alloy 825 |
| Sulfuric and phosphoric acid service | Alloy 825 |
| Chemical processing equipment | Alloy 825 |
| Higher mechanical strength | Alloy 925 |
| Sour oil & gas service | Alloy 925 |
| High-strength marine applications | Alloy 925 |
| Downhole oil & gas components | Alloy 925 |
| Corrosion resistance with high load | Alloy 925 |
Incoloy Fastener Product Range
Incoloy fasteners are available in standard and custom configurations for oil & gas, chemical, marine and corrosion-resistant industrial applications.
Incoloy Hex Bolts
Product Type: Hex Head Bolts / Full Thread Hex Bolts / Partial Thread Hex Bolts / Custom Hex Bolts
Size Range: Standard / Custom
Thread System: Metric / UNC / UNF
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Incoloy Heavy Hex Bolts
Product Type: Heavy Hex Bolts / Large Diameter Heavy Hex Bolts / Custom Heavy Hex Bolts
Size Range: Standard / Custom
Thread System: Metric / UNC / UNF
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Incoloy Stud Bolts
Product Type: Fully Threaded Studs / Double End Studs / Tap End Studs / Flange Stud Sets
Size Range: Standard / Custom
Thread System: Metric / UNC / UNF / 8UN
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Incoloy Nuts
Product Type: Hex Nuts / Heavy Hex Nuts / Custom Nuts
Size Range: Matched to Bolt / Stud Size
Thread System: Metric / UNC / UNF
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Incoloy Washers
Product Type: Flat Washers / Heavy Washers / Custom Washers
Size Range: Standard / Custom
Inner Diameter: Standard / Custom
Outer Diameter: Standard / Custom
Thickness: Standard / Custom
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Incoloy Socket Head Cap Screws
Product Type: Socket Head Cap Screws / Custom Socket Screws
Size Range: Standard / Custom
Thread System: Metric / UNC / UNF
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Incoloy Threaded Rods
Product Type: Fully Threaded Rods / Cut-to-Length Threaded Rods
Size Range: Standard / Custom
Thread System: Metric / UNC / UNF
Thread Type: Coarse / Fine
Standard: ISO / DIN / ASME, as applicable, or customer drawings.
Documentation: MTC / EN 10204 3.1
Custom Incoloy Fasteners & Machined Components
Product Type: Custom Bolts / Special Studs / Threaded Parts / Machined Components
Size Range: According to Drawing
Tolerance: According to Drawing
Manufacturing Basis: Customer Drawing / Project Specification
Inspection: Dimensional / PMI / Mechanical Testing as Required
Need a Product Type Not Shown Here?
We also manufacture custom and project-specific fasteners according to drawings, specifications or application requirements.
Process Control
Manufacturing Excellence
A controlled six-stage production workflow supports consistent manufacturing from reviewed raw material to finished, identified and export-ready specialty-alloy fasteners.
01
Raw Material Preparation
The specified alloy grade, product form, material condition and batch identity are reviewed before cutting. Stock is prepared according to the order and selected manufacturing route.
02
Cutting & Blanking
Bars, rods or forgings are cut to the required blank size while maintaining material separation and batch identification.
03
Forging / CNC Machining
Headed fasteners are forged and machined when appropriate, while complex, low-volume or drawing-based components can be produced by precision CNC machining.
04
Thread Manufacturing
Threads are rolled or cut according to material condition, product geometry, dimensional standard and customer requirements.
05
Heat Treatment
Solution treatment, annealing, age hardening or other thermal processing is applied only when required by the alloy grade, material condition and governing specification.
06
Finishing & Packing
Finished parts are deburred, cleaned and prepared as specified, then identified and packed according to order and traceability requirements.
Quality Control
Quality Assurance & Full Traceability
Inspection and documentation are planned around the purchase specification, customer drawing and intended service. The agreed inspection scope is confirmed according to individual project requirements.
Material Verification
Material grade, heat or lot number and incoming documents are checked against the agreed order requirements before production.
Heat Number Traceability
Batch identity is maintained through production, inspection and packing so finished parts can be linked to their source material.
Dimensional Inspection
Critical dimensions, tolerances and product geometry are checked against the applicable dimensional standard or customer drawing.
Thread Inspection
Thread size, pitch and fit are verified using suitable gauges and measuring equipment. Additional profile verification can be arranged when specified.
PMI & Mechanical Testing
PMI, hardness, tensile or other testing can be performed or arranged when specified, depending on the material, test method and project requirements.
MTC / EN 10204 3.1 Documentation
MTC / EN 10204 3.1 documentation, dimensional reports, PMI reports and traceability records can be supplied when specified and applicable.
Inspection methods, sampling plans, acceptance criteria and document requirements should be confirmed before order placement.
Discuss Inspection & Documentation RequirementsIndustries Served
Applications & Industries
Our specialty-alloy fasteners support demanding projects across multiple industries. Final material selection must be based on the actual temperature, corrosion medium, mechanical load, applicable standards and required service life.
Oil & Gas
Flange bolting, valves, pressure equipment, piping systems and process units exposed to pressure, temperature or corrosive media.
Chemical Processing
Reactors, heat exchangers, scrubbers, pumps and equipment handling acids, chlorides or other aggressive process media.
Power Generation
Gas and steam turbines, boilers, furnaces, heat-treatment systems and high-temperature mechanical assemblies.
Marine & Offshore
Offshore platforms, seawater systems, marine equipment and desalination installations requiring corrosion-resistant fastening.
Aerospace
Engine, thermal and precision assemblies requiring high strength, temperature capability, low weight or controlled material performance.
Nuclear & Critical Equipment
Safety-critical bolting and engineered components requiring controlled materials, documentation and reliable long-term performance.
Not every alloy is suitable for every industry or service condition. Material suitability should be confirmed against the governing specification and actual operating environment.
Discuss Your ApplicationFrequently Asked Questions
Common questions about specialty-alloy fasteners, custom manufacturing, standards, inspection, documentation and procurement.
1. What specialty-alloy fastener products can you manufacture?
Our product range includes hex bolts, heavy hex bolts, stud bolts, nuts, washers, socket head cap screws, threaded rods and drawing-based fasteners or machined components. Availability depends on material grade, dimensions and quantity.
2. Can you manufacture non-standard parts from customer drawings?
Yes. We can review drawings for custom bolts, studs, nuts, washers, threaded parts and precision machined components. The quotation is based on material, dimensions, tolerances, heat treatment, inspection requirements and order quantity.
3. Which dimensional and thread standards can you support?
Products can be manufactured to applicable ISO, DIN, ASME and other recognized dimensional standards, or to customer drawings. Metric, UNC, UNF and other thread systems can be evaluated according to the product and specification.
4. Can you provide MTC and EN 10204 3.1 documentation?
Material test certificates and EN 10204 3.1 documentation can be supplied when specified and applicable to the ordered material and product. Certificate requirements should be confirmed before order placement.
5. Is PMI or third-party inspection available?
PMI and third-party inspection can be arranged when required. The test method, sampling plan, acceptance criteria and reporting requirements should be defined before production.
6. How do you maintain material traceability?
Heat or lot identification is maintained from incoming material through production, inspection and packing, subject to the agreed order and documentation requirements.
7. Can you supply bolts, nuts and washers as matched bolting sets?
Yes. Complete bolting sets can be supplied when requested, with thread compatibility, material selection, inspection and packaging defined for the order.
8. What are your MOQ and lead time?
MOQ and lead time depend on alloy grade, raw-material availability, product size, manufacturing route, heat treatment, testing and order quantity. Made-to-order specialty-alloy fasteners normally require a technical review before confirmation.
Request for Quotation
Custom & Standard
Incoloy Fasteners,
Direct From
Manufacturer.
Send us your Incoloy fastener specifications, standards or drawings. Our engineering team will review your requirements and provide a detailed project-specific quotation.
ISO 9001
EN 10204 3.1
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