CNC Machined Inconel 718 Stud Bolts

FlexiTurn provides precision CNC machining for Inconel 718 (UNS N07718) double-end threaded stud bolts. Using superalloy-specific thread turning protocols and controlled machining processes, we produce fasteners with consistent thread form accuracy and dimensional stability for demanding high-temperature, high-pressure, and corrosive service in oil & gas, chemical processing, and aerospace applications.

FlexiTurn executes the full production sequence in-house, with process parameters calibrated exclusively for Inconel 718 to ensure repeatable fastener performance across every batch.

• CNC Thread Turning: All rotational features — central shank, both end threads and end chamfers — are completed in a single lathe setup. This eliminates re-clamping positional error and guarantees consistent concentricity between shank and both thread sections. Cutting speeds, feeds, carbide thread tooling and high-pressure coolant delivery are optimized for Inconel 718 to minimize work hardening, suppress built-up edge and prevent subsurface plastic deformation at thread roots.
• Optional Precision Grinding: External cylindrical grinding and thread grinding are available for high-fatigue, high-precision applications. This corrects turning-induced distortion, delivers tighter pitch diameter control and produces a damage-free thread root surface, critical for extended fatigue life in cyclic loading environments.
• Secondary Operations: Stress-relief heat treatment to stabilize residual stress, pickling and passivation for enhanced corrosion resistance, and precision surface finishing are available on request to meet specific application requirements.

Materials & Dimensional Specifications

FlexiTurn works with certified premium mill-run Inconel 718, with full mill test reports and batch traceability for every order.

Standard material: Inconel 718 (UNS N07718); alternative nickel superalloy grades available on request

Thread tolerance: ISO 4h/6h for external threads; unified and custom thread forms available

Geometric tolerances: Thread-shank concentricity ≤ 0.01 mm for features ≤ 50 mm nominal diameter

Surface finish: Ra 1.6–3.2 μm for standard turned threads; Ra 0.8–1.6 μm for ground threads

Why Choose FlexiTurn 

Inconel 718-Specific Thread Machining Expertise

Most CNC shops and commodity fastener manufacturers run Inconel 718 on repurposed steel machining parameters, resulting in torn thread roots, excessive subsurface work hardening and residual stress that degrades the alloy’s native resistance to stress corrosion cracking and creep. FlexiTurn’s machining cells are purpose-configured for nickel superalloy fasteners, with validated cutting data, dedicated thread tooling and high-pressure coolant systems. This produces clean, full-form threads with minimal subsurface damage, preserving the alloy’s full high-temperature strength and corrosion performance.

Repeated re-fixturing is the primary cause of concentricity error in stud bolts, leading to uneven preload, eccentric loading and premature fastener failure. FlexiTurn completes all external and thread features in one lathe setup, eliminating cumulative fixturing error for uniform preload distribution and consistent assembly performance across production batches.

All operations — from incoming material certification through turning, heat treatment and final inspection — are performed on FlexiTurn’s premises with zero subcontracting. This reduces lead time variability, eliminates third-party markup and maintains direct oversight of every quality-critical step. Full material batch traceability is maintained from mill certificate to finished part, and studs can be supplied compliant with NACE MR0175 / ISO 15156 on request for oil and gas sour service.

Every CAD submission receives a complimentary Design for Manufacturability assessment within 24 hours, focused on superalloy fastener performance and processing constraints. Our engineering team evaluates thread form, shank-to-thread transitions, tolerance allocations and stress concentration features to mitigate production risk, optimize cost and maximize fastener service life in high-temperature, high-pressure and corrosive environments.

All production adheres to FlexiTurn’s ISO 9001:2015-aligned quality management system. Every shipment includes dimensional inspection records, thread gauge verification and original mill test reports. Third-party inspection and certification packages are available on request for high-criticality aerospace and offshore applications.

How to Proceed

1. Submit your 2D (PDF/DWG) or 3D (STEP/IGES) CAD files, along with material grade, tolerance requirements, order quantity and service environment details.
2. Receive a superalloy fastener-specific DFM assessment and transparent factory-direct quotation from FlexiTurn within 24 hours.
3. Prototype parts are manufactured and delivered with full inspection reports and material certification for design validation and torque testing.
4. Scale seamlessly to volume production with locked process parameters and multi-point in-process dimensional and thread verification.
5. Global shipping with protective packaging, delivered directly to your facility.

For precision CNC machined Inconel 718 stud bolts backed by superalloy-specific thread machining expertise and end-to-end quality control, partner with FlexiTurn. Contact our engineering team today to submit your CAD files and request your free project assessment and custom quote.

Q1. What types of machining services do you offer?

We provide comprehensive CNC turning and milling services. FlexiTurn machines are equipped with 8-station programmable turrets and support both turning and 5-axis milling operations, making them suitable for everything from simple cylindrical parts to complex multi-axis components.

Q2. What materials can you work with?

We machine a wide range of materials including carbon steel, stainless steel, aluminum, plastics, and other engineering-grade materials. If you have a specific material in mind, just send us your requirements and we'll confirm feasibility.

Q3. What is your typical lead time?

Lead times vary depending on part complexity, quantity, and material availability. For prototypes and small-batch runs, we typically deliver within 5–10 business days. For high-volume production, we'll provide a customized schedule after reviewing your drawings. Contact us with your project details for an accurate timeline.

Q4. How do you price your services?

Pricing is based on several factors: material cost, machining time, tooling requirements, setup complexity, and order quantity. We offer competitive rates for both low-volume prototypes and high-volume production runs. Request a quote with your CAD files or drawings and we'll get back to you within 24 hours.

Q5. What quality control measures do you have in place?

We follow strict quality control procedures throughout the machining process. Our CNC systems support programmable precision down to 1 μm, ensuring high accuracy and repeatability. Every batch undergoes dimensional inspection before shipping, and we can provide inspection reports upon request.