[ Material Hub ]
Monel K-500 Fasteners
Patriot Bolt machines Monel K-500 fasteners from certified ASTM B865 bar (UNS N05500). K-500 has the seawater resistance of Monel 400, with aluminum and titanium added so it can be age hardened to much higher strength.
This page brings together the K-500 fasteners we make, the property limits for bolts, studs and nuts, and how K-500 compares with other nickel and corrosion-resistant alloys.
[ Quick Specs ]
Monel K-500 at a Glance
- Material
- Monel K-500, UNS N05500, W.Nr. 2.4375
- Specifications
- ASTM B865 bar · ASTM F468 bolts and studs · ASTM F467 nuts
- Strength
- 130 ksi min tensile, 90 ksi min yield to 7/8 in (F468, aged)
- Key elements
- 63% Ni min, 27–33% Cu, 2.3–3.15% Al
- Products
- Stud bolts, heavy hex nuts, hex cap screws, socket head cap screws
Monel K-500 Fasteners We Machine
Choose a product to see its standards and options. Every order ships with mill test reports traceable to the heat.
Monel K-500 Stud BoltsFull K-500 page
Monel K-500 Heavy Hex NutsMatching nut
K-500 Hex Cap ScrewsMade in K-500
K-500 Socket Head Cap ScrewsMade in K-500Monel K-500 Mechanical Properties
| Specification and size | Tensile / proof, min | Yield (0.2%), min | Hardness |
|---|---|---|---|
| ASTM F468 Ni 500, 1/4 to 7/8 in | 130 ksi tensile | 90 ksi | 24–37 HRC |
| ASTM F468 Ni 500, 1 to 1-1/2 in | 130 ksi tensile | 85 ksi | 24–37 HRC |
| ASTM F467 Ni 500 heavy hex nuts | 140 ksi proof | — | 24 HRC min |
Full chemistry is on the Monel K-500 stud bolts page.
K-500 vs. Other Nickel and Corrosion-Resistant Alloys
| Grade | Strength, min (tensile / yield) | Typical use |
|---|---|---|
| Monel K-500 (F468 Ni 500) | 130 / 90 ksi to 7/8 in | High-strength marine and oil tool hardware |
| Monel 400 (F468 Ni 400) | 80 / 40 ksi to 3/4 in | Seawater, brine and hydrofluoric acid |
| Inconel 718 (B637, aged) | 185 / 150 ksi | High strength at temperature; oil tools |
| Inconel 725 (API 6ACRA 120K, aged) | 150 / 120 ksi | High-strength sour and subsea service |
| Inconel 625 (B446 Grade 1, annealed) | 120 / 60 ksi | Seawater, subsea and acid service |
Compare all grades in the Fastener Materials Matrix.
Monel K-500 Fastener FAQ
What is Monel K-500 used for?
Marine and subsea bolting, pump shafts and oil tool components that need seawater resistance and high strength.
Which K-500 fasteners does Patriot Bolt make?
We machine K-500 stud bolts, heavy hex nuts, hex cap screws and socket head cap screws, as well as custom parts made to your drawing.
How does K-500 compare with Monel 400?
Same nickel-copper base and similar corrosion resistance, but age-hardened K-500 has roughly twice the yield strength.
Do Monel K-500 fasteners come with certifications?
Yes. Patriot Bolt is ISO 9001:2015 certified, and every Monel K-500 order includes mill test reports traceable to the heat and a certificate of conformance to your purchase order.
Request a Quote
Send us the product, size, specification and quantity, or upload your drawing. Call (281) 581-0176 or request a quote.