--- title: "8637 8640 — composition, equivalents and standards" description: "8637 8640: 4 equivalent designations across 3 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/aisi-sae/8637-8640 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/aisi-sae/8637-8640.md cs: https://steelequivalents.com/cs/materiály/aisi-sae/8637-8640.md de: https://steelequivalents.com/de/werkstoffe/aisi-sae/8637-8640.md es: https://steelequivalents.com/es/materiales/aisi-sae/8637-8640.md fr: https://steelequivalents.com/fr/matériaux/aisi-sae/8637-8640.md hu: https://steelequivalents.com/hu/anyagok/aisi-sae/8637-8640.md it: https://steelequivalents.com/it/materiali/aisi-sae/8637-8640.md nl: https://steelequivalents.com/nl/materialen/aisi-sae/8637-8640.md pl: https://steelequivalents.com/pl/materiały/aisi-sae/8637-8640.md pt: https://steelequivalents.com/pt/materiais/aisi-sae/8637-8640.md ru: https://steelequivalents.com/ru/материалы/aisi-sae/8637-8640.md tr: https://steelequivalents.com/tr/malzemeler/aisi-sae/8637-8640.md zh: https://steelequivalents.com/zh/材料/aisi-sae/8637-8640.md ja: https://steelequivalents.com/ja/材料/aisi-sae/8637-8640.md ar: https://steelequivalents.com/ar/المواد/aisi-sae/8637-8640.md ko: https://steelequivalents.com/ko/재료/aisi-sae/8637-8640.md pt-br: https://steelequivalents.com/pt-br/materiais/aisi-sae/8637-8640.md hi: https://steelequivalents.com/hi/सामग्री/aisi-sae/8637-8640.md content_hash: sha256:0d82924335e76343d8bbadfa6152138158a6a5042f508743987090aa28fb417f generated: 2026-09-24 --- > **Machine-readable Markdown rendering.** This is a Markdown representation of a web page, > served for AI agents and crawlers as a token-efficient alternative to the full HTML. > Full interactive HTML version: https://steelequivalents.com/materials/aisi-sae/8637-8640 > Canonical URL: https://steelequivalents.com/materials/aisi-sae/8637-8640 > Available languages: en, cs, de, es, fr, hu, it, nl, pl, pt, ru, tr, zh, ja, ar, ko, pt-br, hi > Change detection: `content_hash` is the SHA-256 of this document's Markdown body — everything > below this block, whitespace-trimmed, excluding the front-matter. Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. AISI / SAE · United States · 4 designations # 8637 8640 SNCM240 is a grade designated under JIS. We list 3 designations recorded for this grade, in the standards AISI / SAE and ISO. No chemical composition is recorded for this material. - *Designations* **4** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=cd5e7baa-597e-4d28-b8ee-694621629c3e&designation=e2ed2a2b-bac2-4b8a-85e9-a091de461916 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/8637-8640.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [JIS SNCM240 This grade’s own name · 2 grades on that route](/materials/jis/sncm240 "JIS SNCM240") ## Also known as 4 designations · 3 standards · nothing hidden This grade’s own name recorded in our sources as this grade’s own designation under that standard. Indicative taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering. Withdrawn designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once. AISI / SAE United States · 1 - **8637 8640 Indicative** ISO International · 2 - [41CrNiMo2 Indicative](/materials/iso/41crnimo2 "ISO 41CrNiMo2") - [41CrNiMoS2 Indicative](/materials/iso/41crnimos2 "ISO 41CrNiMoS2") JIS Japan · 1 - [SNCM240 This grade’s own name](/materials/jis/sncm240 "JIS SNCM240") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Predicted transformation temperatures Not enough recorded composition to predict a transformation temperature for this grade — missing: C, Mn, Si, Ni, Cr, Mo. ## Physical & mechanical properties An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material. ## Looking for this grade under another name? Search the catalogue by designation, material number or composition — every name on this page is itself a way in. [Search](/search "Steel grade search")[Inquiry](/inquiry?material=cd5e7baa-597e-4d28-b8ee-694621629c3e&designation=e2ed2a2b-bac2-4b8a-85e9-a091de461916 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/aisi-sae/8637-8640.pdf "Datasheet as PDF")