What is the difference between a Monel 400 hex bolt and a heavy hex bolt?

A standard Monel 400 hex bolt uses the ASME B18.2.1 hex head series with a smaller across-flats and washer face dimension. A heavy hex bolt uses ASME B18.2.1 heavy-hex head (larger flats, thicker head, larger bearing area) and is the flanged-joint default in ASME B16.5 raised-face service. Standard hex is the general-purpose choice for structural and mechanical joints; heavy hex is for piping flanges and high-preload service.

What size range is available for Monel 400 hex bolts?

Imperial 1/4 inch through 1-1/2 inch UNC and UNF per ASME B1.1, lengths 1/2 inch to 20 inch. Metric M6 through M40 to DIN 933 (fully threaded) or DIN 931 (partial thread), lengths 16 mm to 300 mm. Larger metric M48 through M64 available on indent.

Are Monel 400 hex bolts suitable for sour service?

Yes. ASTM F468 caps Monel 400 hex bolt hardness at 25 HRC, which is below the NACE MR0175 / ISO 15156-3 ceiling of 35 HRC for nickel-copper bolting. Verify H2S partial pressure and chloride concentration against ISO 15156-3 Annex A.4 before sour qualification. Mill test certificates ship as EN 10204 type 3.2 with the NACE compliance statement.

What is the marking on a Monel 400 hex cap screw?

Per ASTM F468, the head is stamped with the manufacturer identifier plus the F468 marking. Class A (Ni 400, weldable) carries F 468U or F 468U4; the hot-finished equivalent carries F 468HF; Class B (Ni 405, free-machining) carries F 468V. The grade marking governs both chemistry and mechanical floor.

What thread types are available?

Imperial UNC and UNF threads per ASME B1.1 in class 2A fit; metric coarse and metric fine threads per ISO 261. DIN 933 hex bolts are fully threaded up to the head; DIN 931 hex bolts carry a partial thread length proportional to bolt length (LG defined in DIN 931 Table 1).

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Vis hexagonales Monel 400 — UNS N04400 / ASTM F468

Vis hexagonales Monel 400 (UNS N04400) selon ASTM F468 / équivalent ASTM A193 B8M pour brides marines, procédés chimiques, service HF. Tailles M6 à M64, longueurs sur spécification.

Composition chimique

Élément	Plage (% en poids)
Nickel (Ni)	63 min
Copper (Cu)	28 - 34
Iron (Fe)	2.5 max
Manganese (Mn)	2.0 max
Silicon (Si)	0.50 max
Carbon (C)	0.30 max

Propriétés mécaniques

Propriété	Valeur (min)
Tensile / Zugfestigkeit / Carico rottura / Résistance traction	70 ksi / 485 MPa
0.2% yield	28 ksi / 195 MPa
Elongation	35%
Hardness HRB	60-80

Applications

Brides marines ASME B16.5
Boulonnage raffineries HF
Boulonnage cuves acide sulfurique
Fixation machines navales
Équipement eau saumâtre

Normes

ASTM F468
ASTM A193 B8M (equivalent)
DIN 933 / DIN 931 (metric)
ISO 4017 / ISO 4014

Questions fréquentes

Devis en 24h avec certification EN 10204 3.1 ou 3.2.

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Vis hexagonales Monel 400 — UNS N04400 / ASTM F468

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