SAE AMS · United States / Aerospace · 6 designations

6491

6491 is a designation in SAE AMS for the material held under material number 1.3551, also listed as 80MoCrV42-16. It is a material in the category Bearing steels. We list 6 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM and SAE AMS.

Material no. 1.3551
Category Bearing steels · 17 grades
Designations 6

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If you came for one of these

The most-used names for this grade.

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

6 designations · 5 standards · nothing hidden

This grade’s own namerecorded in our sources as this grade’s own designation under that standard.

Indicativetaken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering.

Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.

DIN / ENEurope · 1

80MoCrV42-16This grade’s own name

UNSUnited States · 1

T11350This grade’s own name

AISI / SAEUnited States · 1

M50This grade’s own name

ASTMUnited States · 1

A600 M50Indicative

SAE AMSUnited States / Aerospace · 2

6490Indicative
6491Indicative

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

Iron — the balance, never listed by a standard — 88.6 %Mo — 4.3 %Cr — 4.1 %V — 1 %Traces & impurities · 2.1 %

Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.

Element	% by weight
	0.77–0.85
	≤ 0.4
	0.15–0.35
	0.025
	0.015
	3.9–4.3
	4–4.5
	0.9–1.1
	≤ 0.25
	≤ 0.3

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 publishedsource text, verbatim	Min% by weight	Max% by weight	Bound
C	0,77-0,85	0.770	0.850	Range
Si	≤0,40	—	0.400	Max
P	0,025	0.025	0.025	Exact
S	0,015	0.015	0.015	Exact
V	0,90-1,10	0.900	1.100	Range
Cr	3,90-4,30	3.900	4.300	Range
Mn	0,15-0,35	0.150	0.350	Range
Cu	≤0,30	—	0.300	Max
Mo	4,00-4,50	4.000	4.500	Range
W	≤0,25	—	0.250	Max

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

Density7,85g/cm³Exact

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.

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