High Temperature Corrosion Resistant C276 Nickel Alloy Hex Head Dog Point Bolt Hexagon Bolt
Engineered from Hastelloy C276 (UNS N10276) for extreme oxidizing media, wet chlorine environments, and high mechanical fatigue resistance.
Product Catalog
Featured High-Performance Industrial Fasteners
Tailored manufacturing for critical oil, gas, subsea, chemical, and structural infrastructure. Every fastener is supplied with full material certification, heat number tracking, and stringent quality control.
304 Stainless Steel Eye Bolts Swivel Hinged Type M6-M20 Lifting Anchor Ring Bolt Marine Grade Rigging Fastener OEM Custom
Drop-forged 304 marine rigging hardware with articulated articulation points, proof-tested for heavy off-axis lifting operations.
ASTM A325 Grade 8.8 Carbon Steel Heavy Hex Structural Bolts Zinc Black Oxide Steel Frame Construction Assembly Fasteners
High-tensile structural bolted joints offering high yield clamping strength, compliant with ASTM A325/A490 structural steel codes.
Inconel 718 UNS07718 UNS N07718 AMS 5662 5663 API 6A ASTM B637 High Strength Oil & Gas Bolts Studs Nuts Fastener
Precipitation-hardened nickel superalloy bolting designed according to API 6A CRA and NACE MR0175 for sour-service wellheads and subsea manifolds.
Petrochemical General Use Double Head Stud Bolt 304 Stainless Steel A193B7 A320 B8 Inch Metric Stud Bolt
Continuous and double-ended stud configurations for ASME B16.5 flange assemblies, heat exchangers, and high-pressure chemical pipeline joints.
Wholesale New Model M6 U-Bolts for Petroleum Petrochemical Industry Black Oxide Stainless Steel (304/Carbon) Double Head UNF
Precision-bent pipe clamping fasteners engineered with anti-vibration saddles and thermoplastic coating options for refinery line mounting.
M4 M5 M6 M8 M10 M12 M16 M20*200*290*300*350*400*450*500 DIN912 Hex Socket Cap Head Bolt Full Thread Long Screw Stainless Steel
Extra-long internal wrenching socket screws hot-forged and precision-threaded to ISO 4762 / DIN 912 standards for heavy machine casings.
Factory Direct Engineered Hex Flange Nut 304 Stainless Steel Non Slip Serrated Face Internal Thread Specification M3 M4 M5 M6 M8
Self-locking integrated flange profile distributing bearing pressure, reducing vibration loosening without the requirement of additional spring washers.
Engineering Authority
Alloy Metallurgy & Precision Customization Architecture
In high-temperature, high-pressure, and highly corrosive operating environments, standard commercial bolts fail rapidly due to stress corrosion cracking (SCC), hydrogen embrittlement, or thermal creep. Our advanced metallurgical manufacturing fills the critical gap.
Nickel Superalloys (Inconel & Hastelloy)
For applications where temperatures exceed 550°C or where reducing chemicals dominate:
- Inconel 718 (UNS N07718): Gamma-double-prime precipitation hardened, providing exceptional yield strength up to 650°C. Compliant with API 6A and NACE MR0175 sour gas requirements.
- Inconel 625 (UNS N06625): Solid-solution strengthened matrix resistant to pitting, crevice corrosion, and polythionic acid stress corrosion.
- Hastelloy C276 (UNS N10276): Molybdenum-chromium-tungsten alloy offering unmatched resistance to wet chlorine gas, hypochlorite, and strong mineral acids.
Duplex & Super Duplex Stainless Steels
Balancing high mechanical yield strength with superior localized corrosion protection:
- Duplex 2205 (UNS S32205 / S31803): Dual-phase microstructure delivering twice the design stress limit of standard 316L, PREN ≥ 35.
- Super Duplex 2507 (UNS S32750): Optimized for subsea umbilicals, desalination pumps, and offshore marine manifolds with PREN ≥ 42.
- Zeron 100 (UNS S32760): Alloyed with tungsten and copper for aggressive sulphuric and hydrochloric acid service environments.
Specialty Grades & Reactive Metals
Engineered for lightweighting, cryogenic reliability, or extreme galvanic isolation:
- Titanium Gr. 2 & Gr. 5 (Ti-6Al-4V): Excellent strength-to-weight ratio and complete immunity to ambient marine seawater biofouling.
- Monel 400 & K500: High resistance to rapidly flowing seawater, hydrofluoric acid alkylation, and non-oxidizing salts.
- Precipitation Hardening (17-4PH / 15-5PH): Combines martensitic high strength with high fracture toughness for pump shafts and valve stems.
Specification Matrix
Specialty Fastener Alloy Selection Guide
Cross-reference critical mechanical metrics and corrosion resistance properties to optimize bolting longevity.
| Alloy Grade | UNS Number | Yield Strength (Min, MPa) | Tensile Strength (Min, MPa) | Service Temp. Limit | Key Performance Attribute |
|---|---|---|---|---|---|
| Inconel 718 | N07718 | 1034 | 1240 | -250°C to 650°C | High rupture strength; immune to age-related embrittlement; API 6A CRA compliant. |
| Inconel 625 | N06625 | 415 | 827 | Cryogenic to 980°C | High resistance to pitting, chloride stress corrosion cracking, and severe oxidation. |
| Hastelloy C276 | N10276 | 355 | 790 | Sub-zero to 1040°C | Resists ferric and cupric chlorides, wet chlorine gas, and aggressive chemical processing. |
| Super Duplex 2507 | S32750 | 550 | 750 | -50°C to 300°C | PREN ≥ 42; high resistance to crevice corrosion in subsea offshore lines. |
| Duplex 2205 | S32205 | 450 | 655 | -50°C to 300°C | Double the design strength of 316; resistant to chloride SCC in marine tanks. |
| Monel 400 | N04400 | 170–345 | 480–620 | Sub-zero to 480°C | High resistance to hydrofluoric acid, caustic solutions, and cavitation wear. |
| Titanium Gr. 5 | R56400 | 828 | 895 | -200°C to 400°C | Lightweight (4.43 g/cm³); seawater corrosion immunity; high fatigue resistance. |
| 316L Stainless | S31603 | 220 | 520 | Cryogenic to 800°C | General food-grade, pharmaceutical, and atmospheric marine corrosion resistance. |
Future Horizon
Global Fastener Procurement & Technological Trends
The industrial bolting sector is shifting from basic commercial-grade off-the-shelf procurement toward lifecycle-engineered custom alloys driven by harsher operating conditions, sustainability mandates, and supply-chain digital tracing.
1. Clean Energy & Hydrogen Embrittlement Defense
The global shift toward green hydrogen production, carbon capture and storage (CCS), and next-generation nuclear Small Modular Reactors (SMRs) presents severe material challenges. Atomic hydrogen permeation causes rapid intergranular microcracking in standard high-strength bolting.
Future procurement focuses on vacuum-induction melted (VIM-VAR) nickel alloys and customized precipitation-hardened steels strictly tested according to ASTM F1940 and ISO 16573 for hydrogen embrittlement threshold resistance.
2. Digital Traceability & EN 10204 3.2 Standards
EPC contractors and major plant operators now demand complete digital transparency over supply chains. Simple certificates of conformity (CoC) are no longer sufficient for mission-critical joints.
Procurement contracts require EN 10204 Type 3.1 or independent Type 3.2 third-party inspection (TUV, DNV, Lloyd’s Register) directly linking raw ingot melt chemistry, hot forging ratios, heat treatment cooling curves, and 100% Positive Material Identification (PMI) via optical emission spectroscopy.
3. Advanced Multi-Layer Lubrication Coatings
Galling represents the leading cause of joint failure during the torque makeup of austenitic stainless and nickel alloy threads. Traditional anti-seize pastes wash away under high sea-current velocities and break down in vacuum or high heat.
The trend centers on bonded dry-film lubricants, such as Xylan® fluoropolymer, thermoset PTFE, and ceramic-metallic zinc-flake coatings, which ensure steady torque-tension conversion, low friction coefficients (μ = 0.08–0.12), and over 3,000 hours of ASTM B117 salt spray endurance without seizure.
Factory Capabilities
Why Global EPCs Partner With Our China Facility
Combining complete primary forming lines, automated CNC machining clusters, and in-house mechanical and metallurgical testing laboratories under a single audited ISO 9001:2015 and PED 2014/68/EU management system.
Dual Forming: Hot Forging & Precision CNC
We operate 500-ton hydraulic forging presses and multi-axis CNC Swiss turning centers. We choose cold heading for standard profiles to preserve grain flow, induction hot-heading for large-diameter exotic billets (up to M100 / 4"), and CNC machining for complex bespoke tolerances.
Controlled In-House Thermal Processing
The corrosion resistance and mechanical properties of precipitation-hardened nickel alloys and super duplex grades depend entirely on strict heat treatment. Our calibrated vacuum and protective atmosphere furnaces perform solution annealing, water quenching, and age hardening to eliminate damaging sigma phases.
Rigorous In-House QA Laboratory
Every production batch is tested before leaving the factory. Our testing equipment includes handheld XRF analyzers, optical emission spectrometers, universal tensile testing machines, Charpy impact testers (capable of testing down to -196°C for cryogenic service), hardness testers, and optical thread profile projectors.
Procurement Insights
Frequently Asked Questions (Sourcing FAQ)
Key technical answers for procurement directors, QA inspectors, and project engineering leads.
How do you verify the authenticity of exotic raw materials such as Inconel and Hastelloy?
Every master heat of raw bar stock is sourced from audited, premium melt mills accompanied by certified mill test reports. Upon arrival at our plant, we perform 100% Positive Material Identification (PMI) testing using calibrated XRF spectrometers to verify chemical elemental bounds (Ni, Cr, Mo, Nb, Ti) before any cut or forging operation begins.
Can you manufacture custom non-standard fasteners directly from engineering drawings?
Yes. Beyond international standard dimensions (ASME B18.2.1, DIN 931, ISO 4014, ASTM A193), over 45% of our production consists of tailored parts: custom thread pitches (UNC, UNF, metric fine, 8-UN), reduced shanks, dog points, collar studs, cross-drilled heads, and specialized marine rigging configurations built to client-supplied CAD drawings or sample pieces.
What documentation and certification is provided with critical fastener shipments?
Our standard package includes an EN 10204 3.1 inspection certificate listing heat numbers, complete chemical analysis, tensile/yield strengths, elongation, reduction of area, Charpy impact energy values (if specified), and surface hardness values. Third-party witnessed inspection (EN 10204 3.2) by agencies like Lloyd's Register, DNV, SGS, or Bureau Veritas can be fully accommodated.
How do you resolve galling issues on high-alloy stainless and nickel bolt assemblies?
Thread galling (cold welding) is common in austenitic and nickel alloys. We resolve this through three main technical approaches: 1) Precision rolled threads instead of cut threads to maintain smooth, burnished flank finishes; 2) Matching materials with controlled hardness deltas (e.g., pairing age-hardened nuts with solution-treated studs); and 3) Applying advanced anti-friction coatings like PTFE/Xylan®, silver plating, or specialized phosphate conversion coatings.
What are your standard lead times for custom exotic alloy bolt manufacturing?
Standard prototype and low-volume custom machining runs can be delivered in 7 to 15 business days using our raw bar stock reserves. Production-scale hot forging and large-scale industrial orders typically require 3 to 5 weeks, including heat treatment, non-destructive testing, coating, and export seaworthy packaging.
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