Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Monel 400 Square Bar — UNS N04400 per ASTM B164
Monel 400 square bar is wrought UNS N04400 stock in square cross-section, supplied for shaft keys, square-head bolt blanks, downstream machined fittings, and structural reinforcement in chemical-process equipment. TorqBolt supplies hot-rolled and cold-finished square bar to ASTM B164 in sizes 1/4″ through 4″ (6-100mm), random lengths 3-6 m. EN 10204 3.1 / 3.2 certification supplied.
Size Range & Tolerances
| Side (in) | Side (mm) | Tolerance (cold-finished) |
|---|---|---|
| 1/4 | 6 | ±0.004″ / ±0.10 mm |
| 3/8 | 10 | ±0.005″ |
| 1/2 | 13 | ±0.006″ |
| 1 | 25 | ±0.008″ |
| 1-1/2 | 38 | ±0.010″ |
| 2 | 50 | ±0.014″ |
| 3 | 75 | ±0.020″ |
| 4 | 100 | ±0.030″ |
Chemistry & Mechanical Properties
Chemistry per UNS N04400 (Ni 63+ / Cu 28-34). Annealed: tensile 70 ksi / 485 MPa min, yield 28 ksi / 195 MPa min, elongation 35% min. Full mechanical data.
Manufacturing Routes
- Hot-rolled: rolled to size at >800°C, pickled and shot-blasted finish. Larger sizes (>50mm) typically hot-rolled.
- Cold-finished: drawn or peeled-ground to tight tolerance. Smaller sizes for precision machining.
Common Applications
- Shaft keys (parallel + tapered)
- Square-head bolt blanks for ASME B18.2.1
- Structural reinforcement bars in chemical-process tanks
- Downstream machined fittings (square-section adapters)
- Cable-clamp blanks
Applicable Standards
- ASTM B164 - Monel rod, bar, wire
- ASME B18.2.1 - square-head bolts (downstream)
- DIN 6885 - parallel keys (where Monel keys are specified)
- EN 10204 3.1 / 3.2 - certification
FAQs
Why use Monel 400 for shaft keys?
In pumps and shafts running in seawater, chloride brines, or HF chemistry, conventional carbon-steel or stainless keys corrode and seize. Monel 400 keys remain free-moving and don't weld themselves to the shaft over time.
Hot-rolled vs cold-finished — which to specify?
For machining downstream, cold-finished holds tighter tolerance and produces less swarf. For weld inserts or structural reinforcement, hot-rolled is adequate and cheaper.
What's the smallest square bar Monel 400 is rolled to?
Practical minimum is 1/4″ (6mm) cold-drawn. Below that, specify Monel 400 wire instead and machine the square form from round.
Can square bar substitute for round bar in machining?
Usually not — square bar adds machining cost (cutting tools must shape four corners). Use round bar for circular features, square bar only when the cross-section itself is needed.
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