[ Nuts ]
Monel 400 Heavy Hex Nuts
Patriot Bolt machines Monel 400 heavy hex nuts from certified ASTM B164 bar (UNS N04400). Monel 400 nuts pair with Monel 400 studs and bolts for seawater, brine and hydrofluoric acid service.
We make Monel 400 nuts to ASTM F467, to B164 bar properties or to your drawing. Every order ships with mill test reports traceable to the heat.
[ Quick Specs ]
Monel 400 Heavy Hex Nuts at a Glance
- Material
- Monel 400, UNS N04400
- Specifications
- ASTM F467 (Ni 400) · ASTM B164 / ASME SB164 bar
- F467 requirements
- 80 ksi min proof stress (hex), 86 ksi (heavy hex), 75 HRB min
- Style
- Heavy hex to ASME B18.2.2
- Matching studs and bolts
- Monel 400 studs · heavy hex bolts
Why Engineers Specify Monel 400 Nuts
- Same alloy as the stud. Matching nut and stud material avoids galvanic corrosion in seawater and acid service.
- Defined nut requirements. ASTM F467 lists Monel 400 as alloy Ni 400, with a proof stress and minimum hardness.
- Galling. Monel can gall. Use a compatible anti-seize on assembly.
Monel 400 Nut Specifications
ASTM F467 covers nonferrous nuts from 1/4 to 1-1/2 in. Larger nuts are machined from ASTM B164 bar.
| ASTM F467 Ni 400 nut style | Proof stress, min | Hardness, min |
|---|---|---|
| Hex and hex flange | 80 ksi | 75 HRB |
| Heavy hex | 86 ksi | 75 HRB |
Put the specification on your purchase order so the nuts are made and tested to it.
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.
Nut Styles
- Heavy hex nuts to ASME B18.2.2, the standard style for flange studs.
- Heavy hex jam nuts where a thinner nut is needed.
- Threads: UNC through 1 in and 8UN above 1 in, or the thread on your drawing.
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.
Nuts are marked with the material and our identification.
Compare Monel 400 with other bolting grades in our Fastener Materials Matrix.
Monel 400 Heavy Hex Nuts FAQ
Which specification covers Monel 400 nuts?
ASTM F467 covers Monel 400 nuts as alloy Ni 400, from 1/4 to 1-1/2 in. Larger nuts are machined from ASTM B164 bar.
How strong are Monel 400 heavy hex nuts?
Under ASTM F467, Ni 400 heavy hex nuts have an 86 ksi minimum proof stress and 75 HRB minimum hardness.
Can Monel 400 nuts be used on Monel K-500 studs?
K-500 studs are much stronger than Monel 400 nuts, so K-500 nuts are normally used to match the stud strength. Follow your project specification.
Do you make matching Monel 400 studs and bolts?
Yes. We machine Monel 400 stud bolts and heavy hex bolts, so the whole set can come from one source.
Request a Quote
Send us the alloy, nut style, thread size, specification and quantity, or upload your drawing. Our team will confirm the material and lead time. Call (281) 581-0176 or request a quote.