[ Stud Bolts ]
Monel 400 Stud Bolts
Patriot Bolt machines Monel 400 stud bolts from certified ASTM B164 round bar for seawater, brine and hydrofluoric acid service. Alloy 400 (UNS N04400) is a nickel-copper alloy with about 63% nickel and 30% copper.
We make Monel 400 studs to ASTM F468, ASTM B164 or your drawing. Every order ships with mill test reports traceable to the heat.
[ Quick Specs ]
Monel 400 Stud Bolts at a Glance
- Also called
- Alloy 400 · UNS N04400 · W.Nr. 2.4360
- Material specs
- ASTM B164 / ASME SB164 bar · ASTM F468 studs · ASTM F467 nuts · NACE MR0175 / ISO 15156
- Strength
- 80 ksi min tensile, 40 ksi min yield to 3/4 in (ASTM F468)
- Corrosion
- Seawater, brine, steam, alkalis and hydrofluoric acid
- Configurations
- Fully threaded, double-end and tap-end
Why Engineers Specify Monel 400 Stud Bolts
- Hydrofluoric acid. Monel 400 is a standard bolting material in HF alkylation units, where most stainless steels are not suitable.
- Seawater. It has low corrosion rates in flowing seawater and brine.
- Toughness. Alloy 400 stays ductile from cryogenic temperatures up through moderate heat.
- Matched joint. Monel 400 nuts on Monel 400 studs avoid galvanic mismatch.
Monel 400 Stud Bolt Specifications
ASTM F468 covers nonferrous bolts and studs, listing Monel 400 as alloy Ni 400. The bar is produced to ASTM B164, whose strength depends on the condition the bar is supplied in.
| Specification | Size | Tensile, min | Yield (0.2%), min | Elongation, min |
|---|---|---|---|---|
| ASTM F468 Ni 400 | 1/4 to 3/4 in | 80 ksi | 40 ksi | 20% |
| ASTM F468 Ni 400 | 7/8 to 1-1/2 in | 70 ksi | 30 ksi | 20% |
| ASTM B164, cold worked, stress relieved | Rounds 1/2 to 3-1/2 in | 87 ksi | 60 ksi | 20% |
| ASTM B164, hot worked | Rounds to 12 in | 80 ksi | 40 ksi | 30% |
| ASTM B164, annealed | All sizes | 70 ksi | 25 ksi | 35% |
Monel 400 cannot be hardened by heat treatment. If you need more strength in the same alloy family, see Monel K-500. Confirm the stud size and preload with your engineer.
Monel 400 Chemical Composition
| Element | Weight % |
|---|---|
| Nickel (+ cobalt) | 63.0 min |
| Copper | 28.0–34.0 |
| Iron | 2.5 max |
| Manganese | 2.0 max |
| Silicon | 0.5 max |
| Carbon | 0.3 max |
| Sulfur | 0.024 max |
Limits per the current edition of the specification. The mill test report for your heat is the controlling document.
Stud Configurations
- Fully threaded studs, threaded end to end, for flange bolting where grip length varies.
- Double-end studs, threaded on both ends with an unthreaded center.
- Tap-end studs, with one end made to thread into a tapped hole.
Nickel alloys can gall. Use a compatible thread lubricant or anti-seize on assembly.
Applications and Industries
- Refining: HF alkylation units and acid handling. See Petrochemical & Refining.
- Marine and offshore: Seawater piping, pumps and valves. See Oil & Gas.
- Industrial: Brine, caustic and steam service. See Industrial Manufacturing.
Certification and Traceability
Patriot Bolt is ISO 9001:2015 certified. Each Monel 400 order includes mill test reports traceable to the heat, along with a certificate of conformance to the specification on your purchase order.
Studs are marked with the material and our identification.
Compare Monel 400 with other bolting grades in our Fastener Materials Matrix.
Monel 400 Stud Bolts FAQ
Why use Monel 400 studs in hydrofluoric acid service?
Monel 400 resists hydrofluoric acid, especially when de-aerated, which is why it is a standard bolting material in HF alkylation units.
How strong are Monel 400 studs?
Under ASTM F468, Monel 400 studs have an 80 ksi minimum tensile and 40 ksi minimum yield through 3/4 in. Larger sizes have lower minimums.
Which nuts go with Monel 400 studs?
Monel 400 nuts to ASTM F467 (Ni 400), so the stud and nut match.
Can you make Monel 400 studs to my drawing?
Yes. We machine Monel 400 studs in the diameter, length and thread on your drawing or purchase order.
Request a Quote
Send us the stud configuration, diameter, length, thread, specification and quantity, or upload your drawing. Our team will confirm the material and lead time. Call (281) 581-0176 or request a quote.