Inconel Lock Nuts
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
A Ni-Cr alloy known for its high temperature stability & corrosion resistance
High temperature stability up to 2200°F (1204°C)
Good corrosion resistance at elevated temperatures
High strength material with excellent toughness at elevated temperatures
Inconel grades: 600, 601, 625, 686, 718, 725, X750
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RAYCHIN LIMITED
Inconel Lock Nuts · Self-Locking · Nylon Insert · All-Metal · Serrated Flange · Slotted HexInconel Lock Nuts: Nickel-Chromium Superalloy Self-Locking Nuts for Extreme Environments
RAYCHIN LIMITED is a leading manufacturer of Inconel Lock Nuts – precision fasteners designed to resist loosening under vibration, thermal cycling, and dynamic loads. These Inconel self-locking nuts are available in multiple configurations: nylon insert lock nuts (for reusable, vibration-resistant applications), all-metal prevailing torque lock nuts (for high-temperature service up to 700°C+), serrated flange lock nuts (for increased bearing surface and locking action), and slotted hex lock nuts (for castle/cotter pin applications). Manufactured from premium nickel‑chromium superalloys, they deliver exceptional high‑temperature strength up to 1150°C, outstanding oxidation resistance, and immunity to chloride‑ion stress corrosion cracking. Our portfolio includes all standard and custom configurations manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Whether you require Inconel 718 lock nuts for aerospace turbine assemblies, Inconel 625 lock nuts for offshore platforms, or Inconel 600 lock nuts for nuclear applications, RAYCHIN delivers precision, quality, and full traceability. All mechanical properties are presented in MPa and ksi (kilopound per square inch).
Inconel Lock Nuts – Types & Configurations
Nylon Insert Lock Nuts (Reusable)
Inconel nylon insert lock nuts feature a non-metallic locking element that provides prevailing torque by deforming threads. Ideal for applications requiring repeated removal and installation. Temperature rating limited to 120°C (250°F) due to nylon. Available in hex, heavy hex, and thin patterns. Sizes #4 to 1½" (M3 to M36).
All-Metal Prevailing Torque Lock Nuts
Inconel all-metal lock nuts achieve locking through controlled thread distortion (elliptical, slotted, or top-lock designs). Suitable for high-temperature service up to 700°C+ (1300°F+). Grades 718 and X-750 commonly used for aerospace and gas turbine applications. Meets MS21042, MS21043, MS21045, MS21046, and NAS3350 specifications.
Serrated Flange Lock Nuts
Inconel serrated flange lock nuts combine a wide flange with serrations on the bearing surface that bite into the mating material, providing vibration resistance without additional locking elements. Ideal for high-vibration environments where space is limited. Available in standard and thin patterns.
Slotted Hex & Castle Lock Nuts
Inconel slotted hex lock nuts (castle nuts) feature slots that align with a drilled hole in the bolt for cotter pin insertion. Positive mechanical locking for critical assemblies such as landing gear and control linkages. Conforms to AN310, AN320, MS17825, MS17826.
Aerospace & Military Standards
Our Inconel lock nuts meet NAS1291, NAS1292, NAS1802, MS21042, MS21043, MS21045, MS21046, MS17825, MS17826, AN310, AN320, AN363, AN364, AN365. Full compliance with AMS 5662 (718), AMS 5666 (625), and AMS 5665 (600) for material and heat treatment. Silver plating per AMS 2410 available for anti-galling and high-temperature anti-seize.
Custom & Non-Standard Lock Nuts
Need a special locking element, non-standard thread, or proprietary marking? RAYCHIN engineers design and produce custom Inconel lock nuts to your exact specifications – any Inconel grade, any heat treat condition (annealed, aged), with full material traceability. Prototype to production volumes supported.
Critical Applications of Inconel Lock Nuts
Aerospace & Defense
Inconel 718 lock nuts used in turbine engine assemblies, landing gear, flight control systems, and missile components. Withstand 650°C operating temperatures and extreme vibration. Self-locking mechanism prevents loosening under high-G maneuvers. Specified in EN 4123, EN 4047, DIN EN 4047 for MJ threads with 1550 MPa classification.
Oil & Gas / Sour Service
Inconel 625 lock nuts and Inconel 718 lock nuts qualified per NACE MR0175 for wellhead equipment, valve bonnets, and subsea actuators. Resist sulfide stress cracking (SSC) and pitting in H₂S/CO₂ environments. All-metal lock designs ensure reliable locking at elevated temperatures.
Power Generation
Inconel lock nuts in gas turbines, steam turbines, and nuclear reactors provide reliable locking of casings, flanges, and sensor mounts. Maintain clamping force after thousands of thermal cycles from -200°C to 700°C without relaxation. Nylon insert designs for low-temperature auxiliary systems.
Chemical Processing
Inconel 625 lock nuts resist boiling sulfuric acid, hydrochloric acid, and chlorinated solvents in reactor agitators, pump shafts, and valve assemblies. All-metal locking element ensures long-term reliability in aggressive media without risk of polymer degradation.
Marine & Offshore
Inconel lock nuts in seawater pump couplings, propeller shaft locking devices, and subsea control modules resist pitting and crevice corrosion in saltwater. Serrated flange designs provide locking without adhesives in high-vibration marine environments.
Motorsport & Automotive
Inconel 718 lock nuts used in high-performance exhaust manifold couplings, turbocharger wastegate linkages, and brake caliper mechanisms. Reliable locking under extreme thermal cycling from -40°C to 900°C.
International Standards & Global Designations – Inconel Lock Nuts
RAYCHIN LIMITED manufactures Inconel lock nuts from material conforming to the most widely used national and international specifications. All material is traceable to the mill.
Chemical Composition (Weight %) – Inconel Alloys for Lock Nuts
Our Inconel lock nuts are produced from melts conforming to the following limits per ASTM/ASME/AMS.
Inconel 600 (UNS N06600 / 2.4816)
Inconel 625 (UNS N06625 / 2.4856)
Inconel 718 (UNS N07718 / 2.4668)
Metallurgical note: High nickel content (≥50%) provides exceptional resistance to chloride stress corrosion cracking. Chromium (14–23%) ensures oxidation resistance up to 1150°C. Molybdenum (in 625) and Nb+Ti (in 718/X-750) contribute to solid‑solution strengthening and precipitation hardening, giving these Inconel lock nuts their signature high‑temperature strength and corrosion resistance.
Complete Mechanical & Physical Properties – Inconel Lock Nuts (MPa / ksi)
Inconel lock nuts are supplied in solution annealed (600, 625) or age‑hardened (718, X‑750) condition per specification. Data represent typical minimum or range values based on ASTM, AMS, and industry standards. ksi values (kilopound per square inch) are provided alongside MPa.
Mechanical Properties – Minimum Requirements (room temperature) for Lock Nuts
Physical Properties (typical) – Inconel Lock Nuts
High‑Temperature Performance of Inconel Lock Nuts
Inconel superalloys retain significant strength at elevated temperatures, making Inconel lock nuts ideal for gas turbines, furnace assemblies, and exhaust systems. Data below demonstrate the suitability of each grade for high‑temperature locking applications.
Elevated Temperature Strength & Locking Capability
At 650°C, Inconel 718 retains about 80% of its room‑temperature tensile strength, making it the preferred choice for high-temperature locking applications where maximum prevailing torque must be maintained.
Exceptional Corrosion Resistance of Inconel Lock Nuts
The high nickel and chromium content imparts resistance to a wide range of corrosive media: chlorides, acids, and alkalis. Inconel 625 and Inconel 718 lock nuts are particularly resistant to pitting and crevice corrosion in seawater and sour environments.
- Chloride stress corrosion cracking (SCC): All Inconel grades exhibit high resistance due to Ni >40%; immune to chloride-ion SCC.
- Sulfuric & Hydrochloric acids: Inconel 625 shows exceptional performance in reducing acids (Mo addition).
- Sour service (H₂S): Inconel 625 & 718 qualified per NACE MR0175/ISO 15156 for oil & gas.
- Oxidation & carburization: Inconel 601 (if used) outperforms due to aluminum addition.
- Seawater: Inconel 625 resists pitting and crevice corrosion, used extensively in marine fasteners.
- High-purity water & alkalis: Inconel 600 offers excellent corrosion resistance in nuclear applications.
Manufacturing Standards – Inconel Lock Nuts
All Inconel lock nuts are manufactured and tested to meet:
We offer surface finishes: passivation (ASTM A967), silver plating (AMS 2410 for anti‑seize), PTFE coating, and electropolish. Full traceability and destructive/non‑destructive testing available (UT, MPI, PMI).
Why RAYCHIN LIMITED – The Inconel Lock Nut Authority
Contact the Inconel lock nut experts
Request a quotation for Inconel lock nuts, self-locking nuts, prevailing torque nuts, nylon insert lock nuts, all-metal lock nuts – any standard (NAS, MS, AN, ANSI, ASTM, ASME, API, NACE, ISO, DIN, KS) – any Inconel grade, any quantity. Global delivery. Mechanical data in MPa/ksi available for all products.
sales@ray-chin.com | +86 534 2166 566Our team provides technical support in English, German, Mandarin, Japanese.
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