--- title: "1.1260 — 66Mn4, 12 equivalent designations" description: "1.1260 is the material number of the grade also listed as 66Mn4. It is a material in the category Others. Designations recorded for this grade: 12." canonical: https://steelequivalents.com/materials/material-no/1.1260 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.1260.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.1260.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.1260.md es: https://steelequivalents.com/es/materiales/número-de-material/1.1260.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.1260.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.1260.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.1260.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.1260.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.1260.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.1260.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.1260.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.1260.md zh: https://steelequivalents.com/zh/材料/材料编号/1.1260.md ja: https://steelequivalents.com/ja/材料/材料番号/1.1260.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.1260.md ko: https://steelequivalents.com/ko/재료/재료번호/1.1260.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.1260.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.1260.md content_hash: sha256:0770cc3b49c8b0d4bd4d39ef3c3887c60bd664ba6f26b59894d22f9ffe2c47c7 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/material-no/1.1260 > Canonical URL: https://steelequivalents.com/materials/material-no/1.1260 > 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. Material number · Europe · 12 designations # 1.1260 1.1260 is the material number of the grade also listed as 66Mn4. It is a material in the category Others. We list 12 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ISO, GOST, ČSN, PN and STAS. - ***Material no.* **1.1260**** - [*Category* **Others · 1754 grades**](/categories/others "Category: Others · 1754 grades") - *Designations* **12** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=1b7a1678-bf7c-47c2-a91d-bca01957b2bf "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.1260.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [UNS G15660 This grade’s own name · 2 grades on that route](/materials/uns/g15660 "UNS G15660") - [AISI / SAE 1566 This grade’s own name · 4 grades on that route](/materials/aisi-sae/1566 "AISI / SAE 1566") ## About Others These are miscellaneous metallic alloys that do not fit a more specific material family and may be based on iron, nickel, cobalt, copper or other alloy systems. They are selected for applications requiring particular combinations of strength, hardness, toughness, wear resistance or resistance to demanding service conditions. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 12 designations · 8 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 · 1 - [66Mn4 This grade’s own name Withdrawn](/materials/din-en/66mn4 "DIN / EN 66Mn4") UNS United States · 1 - [G15660 This grade’s own name](/materials/uns/g15660 "UNS G15660") AISI / SAE United States · 4 - [1062 Indicative](/materials/aisi-sae/1062 "AISI / SAE 1062") - [1066 Indicative](/materials/aisi-sae/1066 "AISI / SAE 1066") - [1566 This grade’s own name](/materials/aisi-sae/1566 "AISI / SAE 1566") - [C1062 This grade’s own name](/materials/aisi-sae/c1062 "AISI / SAE C1062") ISO International · 1 - [56Mn4 Indicative](/materials/din-en/56mn4 "ISO 56Mn4") GOST Russia / CIS · 2 - [65G Indicative](/materials/gost/65g "GOST 65G") - [65GA Indicative](/materials/gost/65ga "GOST 65GA") ČSN Czechia · 1 - [13 180 Indicative](/materials/csn/13180 "ČSN 13 180") PN Poland · 1 - [65G Indicative](/materials/gost/65g "PN 65G") STAS Romania · 1 - [65MN10 Indicative](/materials/stas/65mn10 "STAS 65MN10") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 5 elements on file · weight % What this alloy is Fe Mn C Si Iron — the balance, never listed by a standard — 98.1 % Mn — 1 % C — 0.7 % Si — 0.2 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.6–0.71 | | Si | 0.15–0.3 | | Mn | 0.85–1.15 | | P | 0.035 | | S | 0.035 | Carbon Silicon Manganese Phosphorus Sulfur 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 | 0,60-0,71 | 0.600 | 0.710 | Range | | Si | 0,15-0,30 | 0.150 | 0.300 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Mn | 0,85-1,15 | 0.850 | 1.150 | 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, Cr, Mo. ## 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 1.1, a shared category, and a published range for Mn / Si 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. [P275SL 1.1100 Mn 0,50-1,50 · Si ≤0,40 - ΔMn 0.00 - ΔSi 0.02 - 3 designations](/materials/din-en/p275sl "P275SL")[25Mn4 1.1177 Mn 0,95-1,15 · Si ≤0,40 - ΔMn 0.05 - ΔSi 0.02 - 1 designations](/materials/din-en/25mn4 "25Mn4")[70Mn4 1.1244 Mn 0,80-1,10 · Si ≤0,40 - ΔMn 0.05 - ΔSi 0.02 - 3 designations](/materials/din-en/70mn4 "70Mn4")[WStE 285 S 1.1333 Mn 0,50-1,40 · Si ≤0,40 - ΔMn 0.05 - ΔSi 0.02 - 1 designations](/materials/din-en/wste-285-s "WStE 285 S")[WStE 315 S 1.1335 Mn 0,60-1,50 · Si ≤0,40 - ΔMn 0.05 - ΔSi 0.02 - 1 designations](/materials/din-en/wste-315-s "WStE 315 S")[30Mn4 1.1146 Mn 0,90-1,20 · Si 0,15-0,35 - ΔMn 0.05 - ΔSi 0.03 - 3 designations](/materials/din-en/30mn4 "30Mn4") ## 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=1b7a1678-bf7c-47c2-a91d-bca01957b2bf "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.1260.pdf "Datasheet as PDF")