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Incoloy Pan Head Screws

Incoloy Pan Head Screws are made of a nickel alloy which contains iron and a lower content of nickel. Incoloy is essentially a more economical option to Inconel, yet with more restricted corrosion resistance and temperature limits. Typically, Incoloy is an ideal material for long-term exposure in high temperature environments due to its oxidation, carburization and creep resistance. Incoloy 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.

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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

Name: Incoloy Pan Head Screws
SKU: 0

Specialist in Incoloy Pan Head Screws · Phillips · Slotted · Hex Drive · Metric · Inch · Custom

Incoloy Pan Head Screws: Nickel-Iron-Chromium Superalloy Machine Screws for Extreme Environments

Incoloy 800 (UNS N08800 / 1.4876) | 800H (UNS N08810 / 1.4958) | 800HT (UNS N08811 / 1.4959) | 825 (UNS N08825 / 2.4858) | 925 (UNS N09925)

RAYCHIN LIMITED is a recognized expert in Incoloy pan head screws — from Incoloy metric pan head screws, Incoloy inch pan head machine screws, Incoloy Phillips drive pan head screws, Incoloy slotted pan head screws to custom non-standard configurations across all major Incoloy grades. Pan head screws feature a rounded top head with a flat bearing surface, providing excellent drive engagement and aesthetic appearance. They are available with various drive types including Phillips, slotted, hex, and combination drives. 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 pan head 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 reliable fastening are critical. Incoloy pan head screws are supplied in solution annealed condition (or aged for 925) with full traceability and third-party certifications.

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Complete Range of Incoloy Pan Head Screws – Configurations

Metric Pan Head Screws (DIN 7985 / ISO 7045)

Incoloy metric pan head screws manufactured to DIN 7985 and ISO 7045 standards. Features a rounded top head with a flat bearing surface, providing excellent drive engagement and aesthetic appearance. Available with Phillips, slotted, and hex drive configurations. Precision rolled threads for superior strength and corrosion resistance. 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 M2 to M24 in various lengths. Supplied in solution annealed condition per ASTM standards.

Inch Pan Head Screws (ASME B18.6.3)

Incoloy inch pan head screws manufactured to ASME B18.6.3 standards. Features a rounded top head with a flat bearing surface, designed for American standard applications. Available with Phillips, slotted, and combination drive configurations. Precision rolled UNC and UNF threads for superior fatigue resistance. Available in sizes from #2 to 1" in various lengths. Supplied with passivated finish per ASTM A967. Ideal for oil & gas, marine, and industrial applications requiring NACE MR0175 compliance with Incoloy 825 or 925 grades.

Phillips Drive Pan Head Screws

Incoloy Phillips pan head screws feature deep, precise Phillips drive recesses for positive driver engagement and torque transfer. Available in PH0 through PH4 sizes for various applications. The Phillips drive provides good centering and is widely used in industrial and aerospace applications. Ideal for instrument mounting, panel fasteners, and general assembly in corrosive environments. Available in metric and inch sizes with all Incoloy grades. Precision formed drive recesses ensure consistent driver engagement.

Slotted Drive Pan Head Screws

Incoloy slotted pan head screws feature a simple, reliable slotted drive design for applications where standard tooling is preferred. The slotted drive provides good torque capability and is easy to clean, making it ideal for food processing and pharmaceutical applications. Available in metric and inch sizes with all Incoloy grades. Precision-formed slots ensure consistent driver engagement and torque transfer.

Incoloy Pan Head Screws – API & NACE Compliant

Incoloy pan head 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 drive configurations with 100% NDT available including PMI, UT, and MPI. Full traceability and material certifications per ASTM standards.

Custom & Specialty Pan Head Screws

Need a special drive configuration, unusual thread size, or custom head dimensions for your extreme environment application? RAYCHIN engineers work with you to produce custom Incoloy pan head screws to your drawing. Options include Torx drive, tamper-resistant drive, combination drives, and custom head diameters. 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 Pan Head 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 Pan Head Screw Design & Standards

Dimensional Standards

Our Incoloy pan head screws meet or exceed the following specifications:

Metric	DIN 7985, ISO 7045, ISO 7046
Inch	ASME B18.6.3, SAE J82
Aerospace	NAS603, NAS604 (inch)
British	BS 4183

Available in UNC, UNF, and metric coarse/fine thread configurations.

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 Pan Head 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 pan head 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 pan head 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.

Versatile Head Design

The pan head profile provides a low-profile, rounded top with flat bearing surface, ideal for general-purpose fastening applications. Available with multiple drive options including Phillips, slotted, hex, and combination drives for maximum versatility.

Chloride SCC Immunity

With high nickel content (30-46%), Incoloy pan head screws have excellent resistance to chloride stress corrosion cracking, making them ideal for marine environments and brackish water applications.

Multiple Drive Options

Available with Phillips, slotted, hex, and combination drives to suit assembly requirements. Deep, accurate drive recesses ensure positive engagement and torque transfer without cam-out.

Manufacturing Standards for Incoloy Pan Head Screws

RAYCHIN LIMITED manufactures Incoloy pan head screws to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.

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International Standards & Global Designations for Incoloy Pan Head Screws

To serve clients worldwide, RAYCHIN LIMITED manufactures Incoloy pan head screws from material conforming to the following national and international specifications.

Incoloy Grade	USA (UNS)	Germany (DIN)	Europe (EN)	UK (BS)	Standards
Incoloy 800	UNS N08800	W. Nr. 1.4876	X10NiCrAlTi32-20	NA15	ASTM B408 / ASME SB408, ASTM B163, ASTM B407
Incoloy 800H	UNS N08810	W. Nr. 1.4958	X5NiCrAlTi31-20	NA15(H)	ASTM B408 / ASME SB408, ASTM B163, ASTM B407
Incoloy 800HT	UNS N08811	W. Nr. 1.4959	X8NiCrAlTi32-21	—	ASTM B408 / ASME SB408, ASTM B163, ASTM B407
Incoloy 825	UNS N08825	W. Nr. 2.4858	NiCr21Mo	NA16	ASTM B424 / ASME SB424, ASTM B423, NACE MR0175
Incoloy 925	UNS N09925	—	—	—	ASTM B805, API 6A, NACE MR0175

UNS N08800 1.4876 UNS N08825 2.4858 UNS N09925 NACE MR0175 API 6A

Chemical Composition (Weight %) – Incoloy Alloys

Our Incoloy pan head 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)

Element	800 / 800H / 800HT Range (%)	Typical (analysis)
Nickel (Ni)	30.0 – 35.0	32.5
Chromium (Cr)	19.0 – 23.0	21.0
Iron (Fe)	39.5 min (Balance)	44.0
Carbon (C) - 800	≤ 0.10	0.06
Carbon (C) - 800H	0.05 – 0.10	0.08
Carbon (C) - 800HT	0.06 – 0.10	0.08
Aluminum (Al)	0.15 – 0.60	0.35
Titanium (Ti)	0.15 – 0.60	0.35
Manganese (Mn)	≤ 1.5	0.8
Silicon (Si)	≤ 1.0	0.5
Copper (Cu)	≤ 0.75	0.4
Sulfur (S)	≤ 0.015	0.008
Phosphorus (P)	≤ 0.030	0.015

Incoloy 825 (UNS N08825 / 2.4858)

Element	ASTM B424 Range (%)	Typical (analysis)
Nickel (Ni)	38.0 – 46.0	42.0
Chromium (Cr)	19.5 – 23.5	22.0
Molybdenum (Mo)	2.5 – 3.5	3.0
Copper (Cu)	1.5 – 3.0	2.0
Iron (Fe)	22.0 min (Balance)	29.0
Titanium (Ti)	0.6 – 1.2	0.9
Carbon (C)	≤ 0.05	0.03
Manganese (Mn)	≤ 1.0	0.5
Silicon (Si)	≤ 0.5	0.3
Aluminum (Al)	≤ 0.2	0.1
Sulfur (S)	≤ 0.03	0.01
Phosphorus (P)	≤ 0.03	0.015

Incoloy 925 (UNS N09925)

Element	ASTM B805 Range (%)	Typical (analysis)
Nickel (Ni)	42.0 – 46.0	44.0
Chromium (Cr)	19.5 – 23.5	21.0
Molybdenum (Mo)	2.5 – 3.5	3.0
Copper (Cu)	1.5 – 3.0	2.0
Iron (Fe)	22.0 – 27.0	24.0
Titanium (Ti)	1.9 – 2.4	2.1
Aluminum (Al)	0.15 – 0.5	0.3
Carbon (C)	≤ 0.03	0.02
Manganese (Mn)	≤ 1.0	0.5
Silicon (Si)	≤ 0.5	0.3
Sulfur (S)	≤ 0.03	0.01
Phosphorus (P)	≤ 0.03	0.015

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 Pan Head Screws

Incoloy pan head 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

Property	Incoloy 800 (Annealed)	Incoloy 800H (Annealed)	Incoloy 825 (Annealed)	Incoloy 925 (Aged)	Units
Tensile Strength (min)	585	585	620	930	MPa
Yield Strength (0.2% offset) (min)	240	240	240	760	MPa
Elongation (min)	30	30	30	15	%
Hardness (max)	200 HBW	200 HBW	200 HBW	35 HRC	—

Physical Properties by Grade

Property	Incoloy 800	Incoloy 825	Incoloy 925
Density (g/cm³)	8.00	8.14	8.08
Melting Range (°C)	1350-1400	1370-1425	1350-1400
Thermal Expansion (20-100°C) (10⁻⁶/°C)	14.4	14.0	13.2
Thermal Conductivity (20°C) (W/m·K)	12.5	11.1	11.6
Modulus of Elasticity (GPa)	195	195	195
Electrical Resistivity (μΩ·m)	0.98	1.12	1.08

Elevated Temperature Properties – Incoloy 800H

Temperature (°C)	Tensile Strength (MPa)	Yield Strength (MPa)	Creep Rupture (1000h stress)
20	585	240	—
600	485	170	—
700	410	150	60-70
800	300	120	30-35
900	150	70	15-18
1000	80	35	8-10

Elevated Temperature Mechanical Properties by Grade

Grade	Maximum Service Temperature	Applications
Incoloy 800	815°C (Oxidizing)	Heat exchangers, furnace components
Incoloy 800H/HT	1150°C (Oxidizing)	Ethylene furnaces, high-temperature process equipment
Incoloy 825	540°C (Acid Service)	Sulfuric acid plants, chemical processing
Incoloy 925	425°C (Sour Gas Service)	Oil & gas downhole tools, wellhead equipment

Exceptional Corrosion Resistance of Incoloy Pan Head 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 pan head 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 pan head 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 pan head 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

Environment	Recommended Grades	Performance
Sulfuric Acid (H₂SO₄)	825, 925	Exceptional resistance up to 100°C
Phosphoric Acid	825	Excellent resistance
High-Temperature Oxidation	800, 800H, 800HT	Superior up to 1150°C
Carburization	800 series	Excellent resistance
Sour Service (H₂S)	825, 925	Qualified per NACE MR0175
Seawater	825	Good pitting resistance
Nitric Acid	800 series	Good resistance

Heat Treatment & Microstructural Stability

Incoloy pan head 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 pan head screws are fully heat treated and tested to ensure optimal performance.

Special focus: Incoloy Pan Head Screws for Critical Applications

For the most demanding applications requiring exceptional high-temperature strength or acid resistance, RAYCHIN offers Incoloy pan head screws manufactured to ASTM, ASME, NACE, and customer-specific specifications. Our capabilities include:

Chemical Processing: Phillips pan head screws for instrument panels, slotted pan head screws for control enclosures, hex drive pan head screws for equipment assembly.
Oil & Gas / Sour Service: NACE MR0175 compliant Incoloy 825 and 925 pan head screws for wellhead instrumentation, valve assembly covers, subsea control modules.
Heat Exchangers & Boilers: Incoloy 800 series pan head screws for heat exchanger covers, access panels, instrument mounting.
Petrochemical Processing: Incoloy 800H and 800HT pan head screws for furnace component assembly, instrument connections.
Power Generation: Incoloy 800 series pan head screws for boiler instrumentation, control panel assembly, equipment covers.
Nuclear Industry: Incoloy 800 pan head screws for instrument mounting, panel assembly, control rod mechanisms.
Marine Engineering: Incoloy 825 pan head screws for instrument enclosures, panel fasteners, offshore platform equipment.
Aerospace & Gas Turbines: Incoloy 800 series pan head screws for instrument panels, access doors, component assembly.
Pharmaceutical & Food Processing: Slotted pan head screws for clean room equipment, Phillips pan head screws for sanitary fittings, electropolished finishes available.
Standards: DIN 7985, ISO 7045 (metric); ASME B18.6.3 (inch); NAS603, NAS604 (aerospace).
Drive Types: Phillips, slotted, hex, combination drives.
Thread Classes: 2A, 3A, UNJF-3A, 6g, 6H.
Sizes: M2 through M24, #2 through 1".
Certifications: EN 10204 3.1/3.2 material certifications, NACE MR0175, API 20F, PED 2014/68/EU.

All Incoloy pan head screws are supplied with full traceability and third-party NDT upon request. Precision-formed drive recesses ensure positive driver engagement. Material certifications included.

Why RAYCHIN LIMITED – The Incoloy Pan Head 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 pan head 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 pan head screws meet applicable ASTM, ASME, NACE MR0175, and API standards.

Precision head forming & drive forming

In-house CNC cold heading and precision drive forming capabilities ensure consistent head dimensions and drive recess geometry. Precision rolled threads provide superior fatigue life and dimensional accuracy. Deep, accurate Phillips, slotted, and hex drives for positive driver engagement. 100% thread and drive inspection available.

Custom solutions

Need a special drive configuration, unusual head dimensions, or custom material certification for your extreme environment application? Our engineering team works with you to produce custom Incoloy pan head screws to your drawing. We provide specialized surface treatments, passivation, and NACE MR0175 compliant processing per customer requirements.

Contact the Incoloy pan head screw experts today

Request a quote for Incoloy pan head screws, metric pan head screws, inch pan head machine screws, Phillips drive pan head screws, slotted pan head screws & custom 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.

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