ASTM / AMS / DIN / EN / GB / JIS cross-reference for high-temperature bolting grades, product specifications, and certification requirements.
Global procurement of superalloy fasteners requires navigating multiple standards systems. The same Inconel 718 bolt might be specified as ASTM B637 (USA), EN 10269 2.4668 (Europe), GH4169 per GB/T 3098.8 (China), or NW7718 per JIS (Japan). This reference maps grade equivalences, fastener product standards, and certification requirements across all major systems.
When writing a purchase order for international supply, always reference both the trade name AND the UNS number. Relying solely on trade names (e.g. "Inconel") can lead to substitution with generic material that does not meet the same chemistry or mechanical requirements.
| Trade Name | UNS | Werkstoff | GB (China) | JIS (Japan) | EN Designation | ASTM Bar | AMS |
|---|---|---|---|---|---|---|---|
| Inconel 718 | N07718 | 2.4668 | GH4169 | NW7718 | NiCr19NbMo | ASTM B637 | AMS 5662/5663 |
| A-286 | S66286 | 1.4980 | GH2132 | SUH660 | X6NiCrTiMoVB25-15-2 | ASTM A453 Gr 660 | AMS 5731/5732/5734 |
| Nimonic 80A | N07080 | 2.4952 | GH4080A | NW4080 | NiCr20TiAl | BS HR 401 | AMS 5828 |
| Hastelloy C-276 | N10276 | 2.4819 | NS3304 | NW0276 | NiMo16Cr15W | ASTM B574 | - |
| Monel K-500 | N05500 | 2.4375 | - | NW5500 | NiCu30Al | ASTM B865 | QQ-N-286 |
| Inconel 625 | N06625 | 2.4856 | GH3625 | NW6625 | NiCr22Mo9Nb | ASTM B446 | AMS 5666 |
The twelve bolting and bar standards behind these grades — ASTM, AMS, EN, DIN, GB and JIS, with the grades each governs — are listed in fastener product standards by region.
The EN 10204 standard defines four levels of material certification. The difference between a 3.1 and 3.2 certificate is the single most common point of confusion in international fastener procurement. Here is what each level means in practice.
| Certification | Name | Testing | Witness | Typical Use |
|---|---|---|---|---|
| EN 10204 2.1 | Declaration of Compliance | None | None | Non-critical, low-value commercial fasteners |
| EN 10204 2.2 | Test Report | Non-specific | None | General industrial, non-safety-critical |
| EN 10204 3.1 | Inspection Certificate 3.1 | Heat-specific | Manufacturer's authorised inspector (independent of production) | Pressure equipment, PED applications, industrial bolting. Our standard certification. |
| EN 10204 3.2 | Inspection Certificate 3.2 | Heat-specific | Manufacturer's + purchaser's authorised inspector, or third-party (SGS/TUV/BV) | Nuclear, aerospace, subsea, NORSOK. Available on request with surcharge. |
Procurement note: Our standard shipment includes EN 10204 3.1 inspection certificates with heat number, full chemical analysis, mechanical properties, grain size, and PMI results. EN 10204 3.2 certification with third-party witness (SGS, TUV, or BV) is available on request. NORSOK M-650 and API 6A CRA qualification testing can be quoted separately. Always specify your certification requirement on the PO.
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