For CNC machining shops specializing in aerospace fasteners and high-strength bolts, GH4169 (equivalent to Alloy 718) bar stock is a double-edged sword. While it boasts exceptional strength, its machining presents two major challenges:
Instantaneous work hardening: Standard hot-rolled or poorly annealed bars can become "diamond-hard" instantly upon tool contact. This leads to carbide insert breakage, reduced surface finish, and soaring tool costs.
Feed jamming and vibration: Inconsistent bar diameter and poor straightness can cause "whipping" and jamming in automatic bar feeders and Swiss-type lathes, resulting in hours of downtime and unbilled losses.
At Gnee Alloy, we are committed to eliminating these bottlenecks. Our precision cold-drawn GH4169 bars are designed for high-speed automated machining, ensuring your production is both high-quality and cost-effective.
Get a quote for precision ground GH4169 bars quickly
Precision GH4169 cold-drawn bar stock | H8-H11 bars for CNC fastener machining
Precision GH4169 cold-drawn bar stock | H8-H11 bars for CNC fastener machining
Precision GH4169 (equivalent to UNS N07718/2.4668) cold-drawn bars, custom-designed for h8–h11 tolerances, are premium raw materials for high-temperature CNC fastener machining. These bars provide the dimensional accuracy required for high-speed CNC turning and thread rolling, ensuring low oxidation and high surface finish (Ra ≤ 0.4μm).
What is GH4169 equivalent to?
Inconel 718
GH4169 is a high-strength, nickel-based superalloy primarily used in aerospace and high-temperature applications. It is equivalent to: Inconel 718 (USA) Alloy 718 (UNS N07718)
1. GH4169 Round Bar description
| Parameter | Description |
|---|---|
| Material | GH4169 (UNS N07718 / Inconel 718) |
| Product Form | Precision Cold Rolled Round Bar |
| Manufacturing Process | Cold Rolling + Precision Grinding / Peeling |
| Surface Condition | Bright, oxide-free, high gloss |
| Applicable Standards | AMS 5662, AMS 5663, ASTM B637, GB/T 14994 |
2. Mechanical properties (aging state) of GH4169 classified by bar diameter
| Diameter Range (mm) | Diameter Range (in) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Reduction of Area (%) |
|---|---|---|---|---|---|
| ≤ 6 | ≤ 0.250 | ≥ 1275 | ≥ 1035 | ≥ 15 | ≥ 20 |
| 6 – 12 | 0.250 – 0.500 | ≥ 1275 | ≥ 1035 | ≥ 14 | ≥ 18 |
| 12 – 25 | 0.500 – 1.000 | ≥ 1275 | ≥ 1035 | ≥ 12 | ≥ 15 |
| 25 – 50 | 1.000 – 2.000 | ≥ 1240 | ≥ 1000 | ≥ 12 | ≥ 12 |
| 50 – 75 | 2.000 – 3.000 | ≥ 1200 | ≥ 965 | ≥ 10 | ≥ 10 |
3. Physical properties of GH4169 bars
| Property | Value |
|---|---|
| Density | 8.19 g/cm³ |
| Melting Range | 1260 – 1336°C |
| Thermal Conductivity (20°C) | 11.4 W/m·K |
| Thermal Conductivity (500°C) | ~16.0 W/m·K |
| Coefficient of Thermal Expansion (20-100°C) | 13.0 × 10⁻⁶/°C |
| Coefficient of Thermal Expansion (20-600°C) | ~14.5 × 10⁻⁶/°C |
| Specific Heat (20°C) | 435 J/kg·K |
| Specific Heat (600°C) | ~500 J/kg·K |
| Modulus of Elasticity (20°C) | ~200 GPa |
| Modulus of Elasticity (600°C) | ~175 GPa |
| Electrical Resistivity | 1.25 µΩ·m |
| Magnetic Permeability | ~1.005 (slightly magnetic) |
Click to download the GH4169 alloy PDF file now
4. GH4169 round bar dimensional accuracy: H9 Precision grinding advantages
We utilize state-of-the-art Centerless Grinding technology to deliver rods that are ready for the most demanding CNC collets.
| Tolerance Class | Precision Level | Best Application |
| h8 / h9 | Ultra-High Precision | Aerospace engine bolts, fuel injectors, sensors. |
| h10 / h11 | High Precision | Standard high-strength studs, industrial pins. |
| Surface Finish | Ra ≤ 0.4 μm | Mirror Finish; reduces friction and tool wear. |
| Straightness | ≤ 0.5 mm / meter | Critical for high-speed CNC rotation without vibration. |
5. Key Specifications for CNC Fastener Machining of GH4169 Alloy Bars
Material: GH4169 / NiCr19NbMo / Inconel 718.
Dimensions and Tolerances: Cold-drawn round bars are typically supplied in h9-h11 grades, while precision grinding can achieve h8 grades to meet more stringent tolerance requirements.
Surface Finish: Bright drawing or polishing to remove surface oxides and reduce tool wear during CNC machining.
Applications: Aerospace fasteners, engine bolts, high-pressure nuts, and studs (typically M3 to M36).
6. GH4169 Round Bar Industrial Applications
Gnee Alloy, a reliable supplier, provides precision rods for core engineering sectors worldwide:
Aerospace Fasteners: Tension bolts, nuts, and studs with zero-defect surface finish requirements.
Medical High-Temperature Equipment: Specialized instrument components.
Oil and Gas Tools: High-pressure valve stems and structural pins (compliant with NACE MR0175).
Automotive: High-performance turbocharger shafts and exhaust valves.
Why choose Tier 1 manufacturer Gnee Alloy?
✅️Direct Factory Pricing: Eliminate middleman markups and secure the best wholesale rates for High-Performance Rods.
✅️MTC 3.1 Traceability: Full heat-analysis and mechanical property verification documented with every order.
✅️Wholesale Inventory: Large stock of standard sizes (3.0mm to 50.0mm) ready for Fast Global Shipping.
✅️Custom Fabrication: We offer precision Cut-to-Length services to deliver ready-to-machine blanks.
Gnee Steel GH4169 Certificate
📦 Packaging and Shipping
All Nickel Based Alloy products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel GH4169 Product Packing
Contact us for the latest export price quote for GH4169 Alloy
FAQ
Q1: Can I use your precision ground rods in a Swiss-type automatic lathe?
A: Yes. Our rods are specifically optimized for Swiss machining. The extreme straightness and tight h9 tolerance prevent "bar whipping" and ensure zero-interference feeding.
Q2: Is GH4169 equivalent to Inconel 718 for aerospace fasteners?
A: Absolutely. GH4169 is the technical equivalent to Inconel 718 (UNS N07718). Our material meets all requirements of AMS 5662 and AMS 5663, making it globally accepted for aviation blueprints.
Q3: Does the bright ground surface improve the final part's fatigue life?
A: Yes. A Smooth Finish (Ra ≤ 0.4μm) eliminates microscopic surface stress initiators, which is critical for components subject to high thermal cycling and vibration.
Q4: Do you offer bulk discounts for aerospace maintenance programs?
A: Yes. We support long-term MRO contracts with attractive Wholesale Pricing and priority scheduling for recurring orders.
