Welcome to RAYCHIN LIMITED

+86-531-59532816



Incoloy Fasteners



Location： HOME - Special Fasteners - Incoloy Fasteners - Incoloy Fasteners

Incoloy Fasteners

Incoloy fasteners 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.

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

Request a Quote from RAYCHIN

We're here to help!

Request a Quote

RAYCHIN LIMITED

Name: Incoloy Fasteners
SKU: 0

Specialist in Incoloy Fasteners · Bolts · Nuts · Screws · Washers · Stud Bolts · Threaded Rods · Custom

Incoloy Fasteners: Nickel-Iron-Chromium Superalloy Bolts, Nuts, Screws, Washers, Stud Bolts & Threaded Rods 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 fasteners — from Incoloy bolts, Incoloy nuts, Incoloy screws, Incoloy washers, Incoloy stud bolts, Incoloy threaded rods to custom non-standard configurations across all major Incoloy grades. 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 fasteners 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 and corrosion resistance are critical. Incoloy fasteners are supplied in solution annealed condition with full traceability and third-party certifications.

Incoloy FastenersIncoloy BoltsIncoloy NutsIncoloy ScrewsIncoloy WashersIncoloy Stud BoltsIncoloy Threaded RodsIncoloy 800 FastenersIncoloy 825 FastenersIncoloy 925 FastenersUNS N08800 FastenersUNS N08825 Fasteners1.4876 Fasteners2.4858 FastenersNACE MR0175 Fastenersnickel superalloy fastenershigh temperature fastenersacid resistant fasteners

Complete Range of Incoloy Fasteners – Types & Configurations

Incoloy Bolts

Incoloy bolts manufactured to DIN 931, DIN 933, ISO 4014, ISO 4017, ASME B18.2.1, and aerospace standards. Available in hex head, heavy hex, flange head, and socket 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 M6 to M100 (metric) and 1/4" to 4" (inch) in various lengths. Precision rolled threads for superior strength and corrosion resistance. Supplied in solution annealed condition per ASTM standards.

Incoloy Nuts

Incoloy nuts manufactured to DIN 934, ISO 4032, ISO 4033, ISO 4034, and ASME B18.2.2 standards. Available in hex nuts, heavy hex nuts, jam nuts, and lock nuts. Precision tapped to Class 2B and 3B tolerances for reliable engagement with mating bolts and studs. Ideal for pressure vessel closures, heat exchanger tube sheets, and flange connections in high-temperature and corrosive environments. Available in all Incoloy grades. Sizes from M3 to M100 (metric) and #4 to 4" (inch).

Incoloy Screws

Incoloy screws including hex head screws, socket head cap screws (DIN 912, ISO 4762, ASME B18.3), flat head screws, button head screws, pan head screws, and set screws. Available with various drive types including hex socket, Torx, and slotted. Ideal for instrument connections, valve components, and equipment in high-temperature and corrosive environments. Sizes from M3 to M36 and #2 to 1-1/2".

Incoloy Washers

Incoloy washers manufactured to DIN 125, DIN 9021, ISO 7089, ISO 7093, and ASME B18.22.1 standards. Available in flat washers, heavy washers, and spring washers. Precision stamped or machined from solution annealed Incoloy, these washers provide uniform load distribution under bolt heads and nuts. Ideal for flange connections, heat exchanger tube sheets, and vessel assemblies. Sizes from M3 to M100 and #2 to 4".

Incoloy Stud Bolts

Incoloy stud bolts manufactured to DIN 938, DIN 939, DIN 976, ASME B16.5, and ASME B18.31.2 standards. Available in double-end studs, fully threaded studs, and tap-end studs. Designed for flange connections, pressure vessel closures, and heat exchanger applications. Essential for ASME B16.5 flange bolting in chemical plants, refineries, and power generation. Sizes from 1/4" to 4" (M6 to M100) in various lengths.

Incoloy Threaded Rods

Incoloy threaded rods manufactured to DIN 975, DIN 976, ASME B18.31.1M, and ASME B18.31.2 standards. Continuous threads along the entire length allow for cutting to any required length for custom applications. Ideal for pipe supports, flange connections, and structural assemblies in high-temperature and corrosive environments. Available in diameters from 1/4" to 4" (M6 to M100) in standard lengths up to 6 meters. Precision rolled threads for superior strength and consistency.

Incoloy Grade Selection Guide for Fasteners

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. Tensile strength 585-750 MPa, yield strength 240-415 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.

Manufacturing Standards for Incoloy Fasteners

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

NASANMSANSIASTMASMESAEAPINACEISODINKSJISGB

Incoloy Fastener Styles

Incoloy Screws	12 Point Screws Button Head Cap Screws Flat Head Screws Hex Head Cap Screws Pan Head Screws Security Screws Set Screws Socket Head Cap Screws Vented Screws	• DIN 603 / ISO 8677 • DIN 912 / ISO 4762 • DIN 913 / ISO 4026 • DIN 914 / ISO 4027 • DIN 915 / ISO 4028 • DIN 916 / ISO 4029 • DIN 921 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017 • DIN 961 / ISO 8676 • DIN 965 / ISO 7046 • DIN 966 / ISO 7047 • DIN 7991 / ISO 10642 • DIN 7380 / ISO 7380 • DIN 84 / ISO 1207 • DIN 85 / ISO 1580 • DIN 34822 • DIN 34821 • DIN 7504 / ISO 15480 • DIN 7984 • DIN 963 / ISO 2009




















Incoloy PH Bolts	Hex Head Bolts Shoulder Bolts Wedge Anchor Bolts	• DIN 931 • DIN 933 • ISO 4014 • ISO 4017 • ISO 7370




Incoloy Nuts	Hex Nuts Lock Nuts	• DIN 439 / ISO 4035 • DIN 934 / ISO 4032 • DIN 985 / ISO 7040 • DIN 986 • DIN 980 / ISO 7042 / ISO 19513 • DIN 6923 / ISO 4161





Incoloy Studs/Rod	Studs Threaded Rod Weld Studs	• DIN 975 • DIN 976


Incoloy Washers	Flat Washers Lock Washer	• DIN 125 / ISO 7089 / ISO 7090 • DIN 126 / ISO 7091 • DIN 127 / ISO 7090 • DIN 9021 / ISO 7093



Incoloy Hose Clamps	Medium Duty Hose Clamps	--

Incoloy Screws

12 Point Screws	Incoloy 12 point screws allow for higher torque to be applied than a socket head cap screw or head head bolt, however they are be less economical due to the complex head design. Available in 1/4" or larger sizes.	• IFI-115 • MIL SPEC • DIN 34822 • DIN 34821



Button Head Cap Screws	Incoloy button head screws offer a wide clamping area and low profile. They are best for fastening material that is too thin to counter bore.	• ASME B18.3 • ASME 18.3.4M • DIN 7380 / ISO 7380


Flat Head Screws	Incoloy flat head screws are most commonly offered in an 82° countersink angle, but can be customized to other angles from 60° -120° and are designed to be flush with the surface. Available in slotted and socket drivers. Phillips, 6-lobe, torx and tamperproof drivers in Inconel flat head screws can be made require special manufacturing.	• ASME B18.3 • ASME B18.3.6 • DIN 963 / ISO 2009 • DIN 965 / ISO 7046 • DIN 7991 / ISO 10642




Hex Head Cap Screws	Incoloy hex head cap screws offer the added washer face to the bolt head which is lacking on a hex bolt and tighter dimensional tolerances. Ideal for a high clamping force applications with ease of access. Generally availabe in #2 - 1/2" sizes and metric sizes.	• ASME B18.6.3 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017 • DIN 961 / ISO 8676



Pan Head Screws	Incoloy pan head screws offer a rounded top are best used for small diameter faster needs. Offered in slotted and they are ideal for low torque applications.	• ASME B18.6.3 • DIN 7985 • DIN 921 • DIN 85 / ISO 1580 • DIN 84 / ISO 1207 (cheese head) • DIN 966 / ISO 7047 (raised counter sunk)







Security Screws	Unique driver designs offer these Incoloy screws resistance to unwanted tampering or removal due to the fact that they cannot be removed using an ordinary driver. Inconel security screws are available in several different drive styles, as well as custom per print.	--

Set Screws	Incoloy set screws are available in cup, cone, flat, dog and half-dog points. Set screws have no head and are equiped with a socket or slotted driver at one end.	• ASME B18.3 • DIN 913 / ISO 4026 • DIN 914 / ISO 4027 • DIN 915 / ISO 4028 • DIN 916 / ISO 4029




Socket Head Cap Screws	Incoloy socket head cap screws are ideal for limited access situations where there is little clearance around the screws. They offer a safe, reliable and economic solution.	• ASMET B18.3 • DIN 912 / ISO 4762 • DIN 7984


Vented Screws	Incoloy vented screws are best for vacuum environments because the hole drilled through its axis (from head through threads) allow gases and other contaminents to vent. Inconel vented screws are available in any style.	--

Incoloy Bolts

Hex Head Bolts	Incoloy hex bolts are similar to hex head cap screws but without the added washer face. They are ideal for high clamping force applications with ease access.	• ASME B18.2.1 • DIN 931 / ISO 4014 • DIN 933 / ISO 4017


Shoulder Bolts	Incoloy shoulder bolts are made up of a head, shoulder and threaded segment. The smooth shoulder section allows for rotating parts. Typically available with socket drivers.	• ASME • DIN 7379 / ISO 7379 • ISO 7370


Wedge Anchor Bolts	Incoloy wedge anchor bolts offer a safe secure fastening solution for attaching equipment and other materials to concrete in corrosive environments.	--

Incoloy Nuts

Hex Nuts	Incoloy hex nuts are available in a variety of styles including finished hex nuts, jam nuts and heavy hex nuts.	• ASME B18.16.3 • ASME B18.2.2 • DIN 439 / ISO 4035 • DIN 934 / ISO 4032 • DIN 986




Lock Nuts	Incoloy lock nuts are available in all metal and polymer insert styles. All-metal lock provide even load distribution and can be used at high temperatures. Polymer insert styles are more economical and are best for temperatures under than 350°F.	• ASME B18.16.3M • DIN 980 / ISO 7042 / ISO 19513 • DIN 6923 / ISO 4161 • DIN 985 / ISO 10511 / ISO 7040

Incoloy Studs & Threaded Rod

Studs	Incoloy studs are fully threaded or partially threaded and made to custom lengths.	• ASME B18.31.2 • DIN 976

Threaded Rod	Incoloy threaded rod or all thread are available in lengths greater than 1 foot. Minimum order quantity is a total of 6 feet of length.	• ASME B1.1 • DIN 975

Weld Studs	Incoloy weld studs are available in both arc or capacitor discharge (CD) styles. Weld studs provide an extremely secure fastening solution when one side of the stud needs to be permanently fix to a part and the other side with the threads accessible.	--

Incoloy Washers

Flat Washers	Incoloy washers are most commonly offered in SAE sizes, but also availabe in USS, oversized and custom sizes upon request.	• ASME 18.21.1 • SAE / USS • DIN 125 / ISO 7089 / ISO 7090 • DIN 126 / ISO 7091




Lock Washers	Incoloy lock washers are offered as split lock washers. Belleville spring lock washers can also be made upon request.	• ASME B18.21.1 • DIN 127 / ISO 7090 • DIN 6796 / ISO 10690

International Standards & Global Designations for Incoloy Fasteners

To serve clients worldwide, RAYCHIN LIMITED manufactures Incoloy fasteners 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	W. Nr. 2.4858 (similar)	—	—	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 fasteners 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 Fasteners

Incoloy fasteners 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 825 (Annealed)	Incoloy 925 (Aged)	Units
Tensile Strength (min)	585	620	930	MPa
Yield Strength (0.2% offset) (min)	240	240	760	MPa
Elongation (min)	30	30	15	%
Hardness (max)	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 Mechanical Properties

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 Fasteners

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 fasteners 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 fasteners 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 fasteners 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 fasteners 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 fasteners are fully heat treated and tested to ensure optimal performance.

Special focus: Incoloy Fasteners for Critical Applications

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

Chemical Processing: Hex bolts for sulfuric acid reactors, heavy hex nuts for acid storage tanks, stud bolts for heat exchanger flanges handling corrosive media.
Oil & Gas / Sour Service: NACE MR0175 compliant Incoloy 825 and 925 fasteners for wellhead equipment, subsea flanges, valve assemblies, and downhole tools.
Heat Exchangers & Boilers: Incoloy 800 series stud bolts for high-temperature heat exchanger tube sheets, boiler component fasteners.
Petrochemical Processing: Incoloy 800H and 800HT bolts for ethylene furnace components, reformer tube supports, high-temperature piping.
Power Generation: Incoloy 800 series fasteners for superheater supports, boiler component hardware, turbine casing studs.
Nuclear Industry: Incoloy 800 fasteners for steam generator components, reactor system hardware, spent fuel processing.
Marine Engineering: Incoloy 825 fasteners for seawater piping flanges, propeller shaft connections, offshore platform hardware.
Pulp & Paper: Incoloy 825 fasteners for bleaching plant flanges, digester connections.
Standards: DIN 931, DIN 933, DIN 934, DIN 912, DIN 938, DIN 939, DIN 975, DIN 976 (metric); ASME B18.2.1, ASME B18.2.2, ASME B18.3, ASME B16.5 (inch); ASTM B408, B424, B805, B163, B423, B407.
Thread Classes: 2A, 3A, UNJF-3A, 6g, 6H.
Sizes: M3 through M100, #2 through 4".
Certifications: EN 10204 3.1/3.2 material certifications, NACE MR0175, API 20F, PED 2014/68/EU.

All Incoloy fasteners are supplied with full traceability and third-party NDT upon request. Material certifications included.

Why RAYCHIN LIMITED – The Incoloy Fastener 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 fasteners 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 fasteners meet applicable ASTM, ASME, NACE MR0175, and API standards.

Precision forming & thread rolling

In-house cold heading, hot forging, and precision thread rolling capabilities ensure consistent head dimensions and thread geometry. Precision rolled threads provide superior fatigue life and dimensional accuracy. 100% thread and dimensional inspection available. Controlled underhead fillet for improved fatigue resistance in high-temperature cyclic applications.

Custom solutions

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

Contact the Incoloy fastener experts today

Request a quote for Incoloy bolts, nuts, screws, washers, stud bolts, threaded rods & 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.

sales@ray-chin.com | +86 534 2166 566

Our team speaks English, German, Mandarin, and Japanese – ready for your global procurement.

Request A Quote! We'll respond as soon as possible(within 12 hours)

Incoloy Fasteners

Incoloy Fasteners: Nickel-Iron-Chromium Superalloy Bolts, Nuts, Screws, Washers, Stud Bolts & Threaded Rods for Extreme Environments