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    Alloy 718 Wedge-Locking Washers for Turbine and High-Strength Joints

    Wedge-locking washer enquiries in Alloy 718 (EN 2.4668 / UNS N07718) for turbine, power and demanding process equipment. Manufacturer, size availability and batch documentation confirmed per quotation.

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    Industrial washers and heavy hex nuts staged for a high-strength bolted assembly
    Washer pairs matched to bolt grade and joint conditions
    EN 10204 3.1 Certified
    ISO 9001 Quality
    Heavy hex nuts prepared for assembly with nickel alloy locking washers
    Washers quoted alongside matched high-temperature bolting

    Overview

    Alloy 718 (EN 2.4668, UNS N07718, commonly referenced as Inconel 718) is a precipitation-hardened nickel-chromium alloy combining very high strength with corrosion and oxidation resistance, widely used in gas turbines, aero-derivative engines and demanding rotating equipment. It is one of the five material families in the Nord-Lock Original range. In bolted joints where washer hardness and strength must match high-tensile, high-temperature bolting, Alloy 718 is the manufacturer's nickel-alloy option. EMG accepts material-specific RFQs and confirms the offered manufacturer, size availability, documentation and lead time before order; these are manufacturer reference grades, not an EMG stock commitment.

    For turbine and high-strength bolted joints, EMG quotes Alloy 718 wedge-locking washers with manufacturer, size availability and documentation confirmed before supply.

    Typical Applications

    • Gas turbine and aero-derivative engine auxiliary bolting
    • Steam turbine and generator equipment subject to vibration
    • High-pressure compressor and expander assemblies
    • Turbocharger, pump and gearbox joints on critical rotating equipment
    • Power generation outages where high-tensile bolting requires matched washers
    • Demanding process equipment where joint relaxation drives unplanned downtime

    Alloy 718 Washer Configurations

    • Standard washer pairs in Alloy 718 — size range confirmed at quotation
    • SP type with enlarged outer diameter, where available in this grade
    • Matched sets with Alloy 718, A286 (A453 Grade 660) or B16 high-temperature bolting
    • Complete turbine and rotating equipment bolting packages
    • Replacement washer pairs for maintenance specifications naming a proprietary part number

    Common Materials & Grades

    Alloy 718 — EN 2.4668 / UNS N07718 (manufacturer reference)Precipitation-hardened nickel-chromium for high strength at elevated temperatureOffered grade, manufacturer and size availability confirmed per RFQSteel, 316L, 254 SMO and C-276 alternatives reviewed where 718 is unavailableNo substitution away from a named brand without buyer and engineering approval

    Standards & Documentation

    • EN 10204 3.1 material certification on the bolting supplied with each washer set
    • Washer manufacturer batch records confirmed separately from stud and nut certificates
    • PMI verification available on request for alloy confirmation
    • ISO 9001:2015 certified quality management system
    • Bolt tightening to the joint designer's specification — washers do not change the required preload method
    • Heat-number traceable studs and nuts where full assembly traceability is required

    NEED MACHINED COMPONENTS TOO?

    Spacers, blinds, special nuts, shafts and bushes — supplied to your drawing with the same traceability as your bolting. Precision Machined Components →

    RELATED RESOURCES

    Wedge-Locking Washers (all materials)254 SMO Wedge-Locking WashersAlloy C-276 Wedge-Locking WashersASTM A453 Grade 660 Stud BoltsHigh-Temperature Bolting AlloysPower GenerationNuts & Washers

    Why washer hardness matters on high-tensile joints

    A wedge-locking washer works by its cams climbing under attempted rotation — which requires the cam faces and serrations to stay hard and undamaged under very high bearing loads. On high-tensile turbine and compressor bolting, a soft washer deforms and the locking action is lost. Alloy 718 provides the strength and hardness to match high-tensile, high-temperature bolting where carbon-steel washers are not suitable for the environment and 316L is not strong enough. Confirm surface hardness compatibility with the joint designer's specification.

    Turbine and rotating equipment outages

    Power generation and mechanical-drive outages run on fixed windows, and exotic washer sourcing is rarely off the shelf. For planned turbine, compressor or generator work, raise washer requirements early with the bolt list — size, grade, quantity in pairs, proprietary part number and documentation. EMG confirms the sourcing route and lead time against the actual shutdown date rather than quoting generic availability.

    Matching Alloy 718 washers to the bolt grade

    Alloy 718 washers are typically paired with Alloy 718, A286 (ASTM A453 Grade 660) or other high-temperature bolting. Mixing a high-strength nickel alloy washer with lower-strength fasteners can create hardness and galvanic mismatches that the joint designer must review. EMG can quote the complete assembly — studs, nuts and washers — under one enquiry, with washer batch records agreed separately from the EN 10204 certificates for the threaded fasteners.

    FREQUENTLY ASKED QUESTIONS

    Technical FAQs

    Why specify Alloy 718 washers instead of steel or 316L?

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    Alloy 718 combines very high strength and hardness with corrosion and oxidation resistance. On high-tensile, high-temperature joints — turbines, compressors, expanders — a softer washer can deform under bearing load and lose its locking action, while plain steel may not suit the environment. 718 matches the strength of high-temperature bolting grades.

    Are Alloy 718 washers available in all sizes?

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    No. Exotic alloy washer availability is size- and variant-specific and narrower than steel. Send the bolt size, thread and washer type required and we confirm actual availability, sourcing route and lead time before quoting.

    What bolting pairs with Alloy 718 washers?

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    Typically Alloy 718, A286 (ASTM A453 Grade 660) or B16 high-temperature studs and nuts, so strength and temperature capability are consistent across the assembly. The joint designer confirms hardness compatibility and preload for the full joint.

    Do you supply genuine Nord-Lock Alloy 718 washers in Australia?

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    EMG accepts Australia-wide washer RFQs. Tell us whether genuine Nord-Lock is mandatory or an alternative may be proposed. Genuine-product sourcing must be confirmed; EMG does not claim authorised-distributor status or certified equivalence. Nord-Lock® is a registered trademark of the Nord-Lock Group. No substitution is made without buyer and engineering approval.

    What documentation is supplied with Alloy 718 washers?

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    Washer manufacturer batch records are agreed at quotation, separate from the EN 10204 3.1 certificates for the studs and nuts. PMI verification of the washer alloy can be arranged on request. State documentation requirements in the RFQ so they are confirmed before order.
    MATERIAL-SPECIFIC WASHER ENQUIRIES

    Specify the washer, not just the bolt

    Nord-Lock's Original range lists five material families. These are manufacturer references, not a claim of EMG stock, authorised distribution or certified interchangeability. We confirm the offered manufacturer, material, dimensions, documentation and lead time in your quotation. A named brand is not substituted without your approval.

    Steel

    EN 1.7182

    General steel joints; confirm coating and mating-surface hardness.

    316L stainless steel

    EN 1.4404

    General stainless assemblies; chloride and acid exposure need separate review.

    254 SMO

    EN 1.4547

    Chloride-exposed pumps, seawater and desalination duties, subject to service review.

    Alloy C-276

    EN 2.4819 or equivalent

    Acidic process and chemical plant applications, subject to service review.

    Alloy 718

    EN 2.4668 or equivalent

    Turbine, power and demanding process equipment, subject to joint approval.

    Reference: Nord-Lock Original wedge-locking technology. Material, size and SP / conical availability must be checked together; not every variant is offered in every grade.

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    GET IN TOUCH

    Need a Quote for Alloy 718 Wedge-Locking Washers?

    Send us the size, grade and quantity — or your drawings and bill of materials — and we'll return a technical quote for alloy 718 wedge-locking washers with lead times and certification included.

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