--- title: "100CrMnMo8 — Bearing steels" description: "100CrMnMo8 in DIN / EN: material number 1.3539, also listed as 100CrMnMoSi8-4-6. Category: Bearing steels. Designations recorded for this grade: 2." canonical: https://steelequivalents.com/materials/din-en/100crmnmo8 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/100crmnmo8.md cs: https://steelequivalents.com/cs/materiály/din-en/100crmnmo8.md de: https://steelequivalents.com/de/werkstoffe/din-en/100crmnmo8.md es: https://steelequivalents.com/es/materiales/din-en/100crmnmo8.md fr: https://steelequivalents.com/fr/matériaux/din-en/100crmnmo8.md hu: https://steelequivalents.com/hu/anyagok/din-en/100crmnmo8.md it: https://steelequivalents.com/it/materiali/din-en/100crmnmo8.md nl: https://steelequivalents.com/nl/materialen/din-en/100crmnmo8.md pl: https://steelequivalents.com/pl/materiały/din-en/100crmnmo8.md pt: https://steelequivalents.com/pt/materiais/din-en/100crmnmo8.md ru: https://steelequivalents.com/ru/материалы/din-en/100crmnmo8.md tr: https://steelequivalents.com/tr/malzemeler/din-en/100crmnmo8.md zh: https://steelequivalents.com/zh/材料/din-en/100crmnmo8.md ja: https://steelequivalents.com/ja/材料/din-en/100crmnmo8.md ar: https://steelequivalents.com/ar/المواد/din-en/100crmnmo8.md ko: https://steelequivalents.com/ko/재료/din-en/100crmnmo8.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/100crmnmo8.md hi: https://steelequivalents.com/hi/सामग्री/din-en/100crmnmo8.md content_hash: sha256:4c7c2e4d794f96216d595001485e404ace5f40000a28d556822a89148911b819 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/din-en/100crmnmo8 > Canonical URL: https://steelequivalents.com/materials/din-en/100crmnmo8 > 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. DIN / EN · Europe · 2 designations # 100CrMnMo8 100CrMnMo8 is a designation in DIN / EN for the material held under material number 1.3539, also listed as 100CrMnMoSi8-4-6. It is a material in the category Bearing steels. We list 2 designations recorded for this grade, in the standards DIN / EN. - [*Material no.* **1.3539**](/materials/material-no/1.3539 "Material no.: 1.3539") - [*Category* **Bearing steels · 17 grades**](/categories/bearing-steels "Category: Bearing steels · 17 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=e1c64e57-688f-4a16-ba8d-723b9baf85b4&designation=fdbe80fe-aa93-4472-a145-aed15f1fb062 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/100crmnmo8.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 100CrMnMoSi8-4-6 This grade’s own name](/materials/din-en/100crmnmosi8-4-6 "DIN / EN 100CrMnMoSi8-4-6") ## About Bearing steels Bearing steels are high-carbon steels designed for rolling-element bearings and other components exposed to repeated contact loading. They are characterised by high hardness, wear resistance and resistance to rolling-contact fatigue after suitable heat treatment. They are used for bearing rings, races and rolling elements where reliable operation under cyclic loads is required. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 2 designations · 1 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. DIN / EN Europe · 2 - **100CrMnMo8 This grade’s own name Withdrawn** - [100CrMnMoSi8-4-6 This grade’s own name](/materials/din-en/100crmnmosi8-4-6 "DIN / EN 100CrMnMoSi8-4-6") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 10 elements on file · weight % What this alloy is Fe Cr C Mn Iron — the balance, never listed by a standard — 94.7 % Cr — 1.9 % C — 1 % Mn — 1 % Traces & impurities · 1.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.93–1.05 | | Si | 0.4–0.6 | | Mn | 0.8–1.1 | | P | 0.025 | | S | 0.015 | | Cr | 1.8–2.05 | | Mo | 0.5–0.6 | | Cu | ≤ 0.3 | | Al | ≤ 0.05 | | O | ≤ 0.0015 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Copper Aluminium Oxygen 0.01 % 0.1 % 1 % 10 % 100 % The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other. | Element | As published source text, verbatim | Min% by weight | Max% by weight | Bound | |---|---|---|---|---| | C | 0,93-1,05 | 0.930 | 1.050 | Range | | O | ≤0,0015 | — | 0.002 | Max | | Al | ≤0,050 | — | 0.050 | Max | | Si | 0,40-0,60 | 0.400 | 0.600 | Range | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 1,80-2,05 | 1.800 | 2.050 | Range | | Mn | 0,80-1,10 | 0.800 | 1.100 | Range | | Cu | ≤0,30 | — | 0.300 | Max | | Mo | 0,50-0,60 | 0.500 | 0.600 | Range | The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred. ## Predicted transformation temperatures Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni. ## Physical & mechanical properties Density 7,85 g/cm³ Exact 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. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.3, a shared category, and a published range for Cr / Mn that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade. [100CrMo7-3 1.3536 Cr 1,65-1,95 · Mn 0,60-0,80 - ΔCr 0.13 - ΔMn 0.25 - 3 designations](/materials/din-en/100crmo7-3 "100CrMo7-3") ## 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=e1c64e57-688f-4a16-ba8d-723b9baf85b4&designation=fdbe80fe-aa93-4472-a145-aed15f1fb062 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/100crmnmo8.pdf "Datasheet as PDF")