Incoloy Security Screws
RAYCHIN SPECIALTY METALS FASTENERS: BOLTS, NUTS, SCREWS, WASHERS, STUDS, THREADED RODS, U-BOLT, J-BOLTS
STANDARD AND CUSTOMIZED, SMALL BATCH AND LARGE BATCH, IMPERIAL AND METRIC
Incoloy Fasteners is widely used for its resistance to seawater, brine, sour gas and high chloride environments at elevated temperatures, which make it a popular choice in the oil and gas and power industries.
A Ni-Cr alloy with very good high temperature stability
Oxidization and carburization resistant up to 1400°F / 760°C
Good corrosion resistance, which increases with the various grades
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RAYCHIN LIMITED
Specialist in Incoloy Security Screws · Tamper-Resistant · Pin-in-Hex · One-Way · CustomIncoloy Security Screws: Nickel-Iron-Chromium Superalloy Tamper-Resistant Fasteners for Extreme Environments
RAYCHIN LIMITED is a recognized expert in Incoloy security screws — from Incoloy tamper-resistant Torx screws, Incoloy pin-in-hex screws, Incoloy one-way screws to custom non-standard security drive configurations across all major Incoloy grades. Security screws feature specialized drive designs that require matching security bits for installation and removal, providing tamper-proof fastening for critical applications. These screws prevent unauthorized access, vandalism, and tampering in sensitive equipment and infrastructure. Incoloy alloys are nickel-iron-chromium superalloys designed for high-temperature and corrosive service. The family includes Incoloy 800 series (800, 800H, 800HT) optimized for high-temperature strength and oxidation resistance up to 1150°C, and Incoloy 825/925 grades with molybdenum and copper additions for exceptional resistance to reducing acids and sour gas environments. The high nickel content ensures resistance to chloride stress corrosion cracking, while chromium provides oxidation resistance. Our portfolio includes security screws manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for the most demanding environments where high-temperature strength, corrosion resistance, and tamper-proof security are critical. Incoloy security screws are supplied in solution annealed condition (or aged for 925) with full traceability and third-party certifications.
Incoloy Security Screw Design & Functional Benefits
Tamper-Resistant Torx (Torx with Pin)
Features a standard Torx drive with a center pin that prevents standard Torx bits from engaging. Requires special Torx bits with matching center hole for installation and removal. Provides excellent security while maintaining high torque transfer capability.
Pin-in-Hex (Hex with Pin)
Standard hex socket with a center pin that blocks standard hex keys. Requires matching hollow hex bits for access. Commonly used in public facilities, transit systems, and equipment requiring moderate security.
One-Way Screws
Designed with sloped drive surfaces that allow installation with standard tools but prevent removal. The head shape cams out when reverse torque is applied, providing permanent tamper-proof fastening. Ideal for permanent installations where removal is not intended.
Custom Security Drives
Custom drive configurations available including tri-wing, spanner, clutch, and proprietary designs to meet specific security requirements. Expert engineering ensures proper drive geometry and torque capability.
Complete Range of Incoloy Security Screws – Drive Configurations
Tamper-Resistant Torx Screws
Incoloy tamper-resistant Torx screws feature a modified Torx drive with a center pin that prevents standard Torx bits from engaging. Available in button head, flat head, and pan head configurations. Ideal for high-temperature corrosive applications up to 1150°C for grade 800 series, and up to 540°C for acid service with grade 825. Available in sizes from M3 to M20 (metric) and #4 to 3/4" (inch) with various head styles. Precision rolled threads for superior strength and corrosion resistance. Supplied in solution annealed condition per ASTM standards.
Pin-in-Hex Security Screws
Incoloy pin-in-hex screws feature a standard hex socket with a center pin that blocks standard hex keys. Requires matching hollow hex bits for access. Available in socket head cap screw, button head, and flat head configurations. Ideal for infrastructure, transit systems, and public facilities in corrosive environments. Available in sizes from M3 to M24 (metric) and #2 to 1" (inch). Precision rolled threads for superior fatigue resistance.
One-Way Security Screws
Incoloy one-way screws feature sloped drive surfaces that allow installation with standard tools but prevent removal. The head shape cams out when reverse torque is applied, providing permanent tamper-proof fastening. Available in pan head and flat head configurations. Ideal for permanent installations in high-temperature and corrosive environments. Available in sizes from M3 to M16 and #4 to 5/8".
Tri-Wing & Spanner Security Screws
Incoloy tri-wing and spanner security screws feature specialized drive configurations for applications requiring enhanced security. Tri-wing drives have three angled slots, while spanner drives have two small holes. Ideal for aerospace, defense, and critical infrastructure in corrosive environments. Available in various head styles with precision-formed drive recesses.
Incoloy Security Screws – API & NACE Compliant
Incoloy security screws certified to NACE MR0175 / ISO 15156 for sour service applications in oil and gas industry. Incoloy 825 and 925 grades are qualified for H₂S environments at elevated temperatures. Incoloy 925 offers premium resistance to sulfide stress cracking with yield strengths up to 760 MPa in aged condition. Available in all security drive configurations with 100% NDT available including PMI, UT, and MPI. Full traceability and material certifications per ASTM standards.
Custom & Specialty Security Screws
Need a special security drive configuration, unusual head style, or custom material certification for your extreme environment application? RAYCHIN engineers work with you to produce custom Incoloy security screws to your drawing. Options include proprietary drive designs, combination drives, and custom head configurations. Expert heat treatment (solution annealed for 800/825, aged for 925) ensures optimum properties. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS standards.
Incoloy Grade Selection Guide for Security Screws
Incoloy 800 (UNS N08800 / 1.4876)
High-Temperature General Purpose: Nickel-iron-chromium alloy with excellent oxidation and carburization resistance up to 815°C. Good creep strength and resistance to sigma phase embrittlement. Ideal for heat exchangers, furnace components, and petrochemical applications. Minimum tensile strength: 585 MPa, yield strength: 240 MPa.
Incoloy 800H (UNS N08810 / 1.4958)
Enhanced High-Temperature Strength: Higher carbon content (0.05-0.10%) provides improved creep and rupture strength. Excellent performance up to 1150°C. Preferred for applications requiring long-term high-temperature stability such as ethylene furnace tubes and steam generators. Maintains structural integrity at extreme temperatures.
Incoloy 800HT (UNS N08811 / 1.4959)
Optimized High-Temperature Performance: Controlled chemistry with aluminum and titanium additions for enhanced creep resistance. Maximum service temperature up to 1150°C. Superior performance in cyclic temperature applications. Ideal for industrial furnace components, radiant tubes, and high-temperature structural fasteners.
Incoloy 825 (UNS N08825 / 2.4858)
Acid & Chloride Resistance: Nickel-iron-chromium alloy with molybdenum (2.5-3.5%) and copper (1.5-3%) additions. Exceptional resistance to sulfuric and phosphoric acids. Resists 40% H₂SO₄ at 100°C with <0.05mm/year corrosion rate. Ideal for chemical processing, acid storage, and marine applications. Maximum service temperature: 540°C in acid service.
Incoloy 925 (UNS N09925)
Sour Service Specialist: Precipitation-hardenable alloy with titanium additions (1.9-2.4%) providing significantly higher strength through aging. Excellent resistance to sulfide stress cracking in H₂S environments. Yield strength 760-965 MPa in aged condition. Ideal for oil & gas downhole tools, sour gas well equipment, and high-strength corrosion-resistant fasteners. Qualified per NACE MR0175.
Incoloy Security Screw Design & Standards
Dimensional Standards
Our Incoloy security screws meet or exceed the following specifications:
Available in UNC, UNF, UNJF-3A, and metric coarse/fine thread configurations. Security drives available in various sizes.
Material Specifications by Grade
- Incoloy 800: ASTM B408 / ASME SB408, ASTM B163, ASTM B407
- Incoloy 800H: ASTM B408 / ASME SB408, ASTM B163, ASTM B407
- Incoloy 800HT: ASTM B408 / ASME SB408, ASTM B163, ASTM B407
- Incoloy 825: ASTM B424 / ASME SB424, ASTM B423, NACE MR0175
- Incoloy 925: ASTM B805, API 6A, NACE MR0175
Surface Finish Options
- Passivated: Per ASTM A967 for maximum corrosion resistance
- Electropolished: For clean room and pharmaceutical applications
- PTFE Coated: For anti-galling and lubricity
- Silver Plating: Per AMS 2410 for high-temperature anti-seize
Key Benefits of Incoloy Security Screws
Exceptional High-Temperature Strength (800 Series)
Incoloy 800H and 800HT maintain useful strength up to 1150°C. At 900°C, tensile strength remains 130-180 MPa, significantly higher than 316H. Excellent creep rupture strength at 1000°C with 20-25 MPa for 1000 hours.
Superior Acid Resistance (825)
Incoloy 825 security screws resist 40% H₂SO₄ at 100°C with <0.05mm/year corrosion rate. Excellent performance in phosphoric acid service, including wet process phosphoric acid containing fluoride impurities.
Sour Service Excellence (925)
Incoloy 925 security screws offer yield strength up to 760 MPa in aged condition with exceptional resistance to sulfide stress cracking. Qualified per NACE MR0175 for H₂S environments up to 425°C.
Tamper-Proof Security
Specialized drive designs require matching security bits for installation and removal, preventing unauthorized access, vandalism, and tampering in critical equipment and infrastructure.
Chloride SCC Immunity
With high nickel content (30-46%), Incoloy security screws have excellent resistance to chloride stress corrosion cracking, making them ideal for marine environments and brackish water applications requiring security fasteners.
Multiple Security Drive Options
Available with tamper-resistant Torx, pin-in-hex, one-way, tri-wing, spanner, and custom security drives to meet specific security requirements. All drives precision-formed for positive engagement.
Manufacturing Standards for Incoloy Security Screws
RAYCHIN LIMITED manufactures Incoloy security screws to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.
International Standards & Global Designations for Incoloy Security Screws
To serve clients worldwide, RAYCHIN LIMITED manufactures Incoloy security screws from material conforming to the following national and international specifications.
UNS N08800 1.4876 UNS N08825 2.4858 UNS N09925 NACE MR0175 API 6A
Chemical Composition (Weight %) – Incoloy Alloys
Our Incoloy security screws are produced from melts that strictly conform to the limits below per ASTM standards. The nickel-iron-chromium matrix provides the exceptional high-temperature strength and corrosion resistance characteristic of these alloys.
Incoloy 800 / 800H / 800HT (UNS N08800 / N08810 / N08811)
Incoloy 825 (UNS N08825 / 2.4858)
Incoloy 925 (UNS N09925)
Expert note: The high nickel content provides resistance to chloride stress corrosion cracking. Chromium offers oxidation resistance at elevated temperatures. In 825/925 grades, molybdenum and copper additions provide exceptional resistance to reducing acids like sulfuric and phosphoric acids. Titanium in 925 enables precipitation hardening, achieving yield strengths over 760 MPa. The aluminum and titanium in 800 series contribute to creep resistance at high temperatures.
Complete Mechanical Properties of Incoloy Security Screws
Incoloy security screws are supplied in the solution annealed condition (800 series, 825) or precipitation hardened condition (925). The data below represent minimum requirements per ASTM standards unless otherwise noted.
Mechanical Properties by Grade
Physical Properties by Grade
Elevated Temperature Properties – Incoloy 800H
Elevated Temperature Mechanical Properties by Grade
Exceptional Corrosion Resistance of Incoloy Security Screws
Incoloy alloys offer outstanding resistance to a wide range of corrosive environments, tailored by grade composition.
High-Temperature Oxidation & Carburization Resistance (800 Series)
Incoloy 800 series security screws form a stable, adherent Cr₂O₃ oxide layer that provides excellent protection up to 1150°C. Chromium content (19-23%) ensures scaling resistance, while the nickel-rich matrix resists carburization and sigma phase embrittlement. Performance is significantly better than 316L stainless steel at elevated temperatures.
Sulfuric & Phosphoric Acid Resistance (825)
Incoloy 825 security screws resist 40% H₂SO₄ at 100°C with corrosion rates <0.05mm/year. The molybdenum and copper additions provide exceptional resistance to reducing acids. Excellent performance in phosphoric acid service, including wet process phosphoric acid containing fluoride impurities.
Sour Service & Chloride SCC Resistance (825, 925)
With high nickel content (>38%), Incoloy security screws have excellent resistance to chloride stress corrosion cracking. Incoloy 825 and 925 are qualified per NACE MR0175/ISO 15156 for H₂S environments. Incoloy 925 offers premium resistance to sulfide stress cracking at strength levels up to 760 MPa yield.
Resistance to Specific Environments
Heat Treatment & Microstructural Stability
Incoloy security screws are supplied in appropriate heat treated conditions for optimum properties:
- Incoloy 800/825: Solution annealed at 980-1035°C followed by rapid cooling.
- Incoloy 800H/HT: Higher temperature solution anneal (1050-1100°C) for enhanced creep properties.
- Incoloy 925: Supplied in solution annealed or aged condition. Aging at 620-760°C after solution treatment produces precipitation hardening, achieving 760-965 MPa yield strength.
Proper heat treatment ensures the balanced microstructure that provides the exceptional corrosion resistance and mechanical properties characteristic of Incoloy alloys. All security screws are fully heat treated and tested to ensure optimal performance.
Special focus: Incoloy Security Screws for Critical Applications
For the most demanding applications requiring exceptional high-temperature strength or acid resistance with tamper-proof security, RAYCHIN offers Incoloy security screws manufactured to ASTM, ASME, NACE, and customer-specific specifications. Our capabilities include:
- Defense & Aerospace: Tamper-resistant screws for weapons systems, avionics, flight control systems, missile components, secure enclosures requiring high-temperature capability.
- Nuclear Industry: Security screws for reactor control systems, spent fuel handling equipment, secure access panels, radiation monitoring stations.
- Oil & Gas / Sour Service: NACE MR0175 compliant security screws for wellhead control panels, valve assemblies, subsea control modules, offshore platform security.
- Chemical Processing: Tamper-resistant screws for reactor controls, valve actuators, instrument panels, secure equipment enclosures in acid environments.
- Pharmaceutical & Biotech: Security screws for clean room equipment, controlled substance storage, secure instrument housings, electropolished finishes.
- Power Generation: Security screws for turbine controls, grid infrastructure, substation equipment, secure access panels.
- Public Infrastructure: Pin-in-hex screws for transit systems, public facilities, correctional facilities, secure infrastructure requiring corrosion resistance.
- Marine & Offshore: Incoloy 825 security screws for offshore platform security, shipboard controls, subsea equipment enclosures.
- Standards: Base dimensional standards with custom security drives; NAS, AN, MS, ASME B18.3, DIN, ISO applicable for base configurations.
- Security Drive Types: Tamper-resistant Torx, pin-in-hex, one-way, tri-wing, spanner, custom proprietary drives.
- Head Styles: Socket head cap, button head, flat head, pan head.
- Thread Classes: 2A, 3A, UNJF-3A, 6g, 6H.
- Sizes: M3 through M24, #2 through 1".
- Certifications: EN 10204 3.1/3.2 material certifications, NACE MR0175, API 20F, PED 2014/68/EU.
All Incoloy security screws are supplied with full traceability and third-party NDT upon request. Security drives are precision-formed for positive engagement with matching bits. Material certifications included.
Why RAYCHIN LIMITED – The Incoloy Security Screw Authority
Metallurgical competence
Engineers on staff with deep expertise in nickel-iron-chromium superalloys. We ensure proper heat treatment for each grade—solution annealing for 800/825, optimized annealing for 800H/HT, and precise aging for 925—to achieve optimal properties. Every heat is verified by in-house PMI testing to confirm chemistry. Our security screws provide the exact balance of high-temperature strength and corrosion resistance required for your application.
Global approvals & traceability
Our quality system is ISO 9001:2015 and AS9100D certified; we also comply with NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS. Full material traceability from melt to final packaging (EN 10204 3.1/3.2). Third-party inspections (ABS, DNV, Lloyds) available. All Incoloy security screws meet applicable ASTM, ASME, NACE MR0175, and API standards.
Precision drive forming & thread rolling
In-house CNC cold heading and precision drive forming capabilities ensure consistent security drive geometry. Precision rolled threads provide superior fatigue life and dimensional accuracy. Deep, accurate security drives for positive engagement with matching bits. 100% thread and drive inspection available.
Custom solutions
Need a special security drive configuration, unusual head style, or custom material certification for your extreme environment application? Our engineering team works with you to produce custom Incoloy security screws to your drawing. We provide specialized surface treatments, passivation, and NACE MR0175 compliant processing per customer requirements.
Contact the Incoloy security screw experts today
Request a quote for Incoloy security screws, tamper-resistant screws, pin-in-hex screws, one-way screws & custom security configurations – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about Incoloy 800, 800H, 800HT, 825, or 925 grades for high-temperature or acid-resistant applications requiring tamper-proof security.
sales@ray-chin.com | +86 534 2166 566Our team speaks English, German, Mandarin, and Japanese – ready for your global procurement.
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