6061-T6 specifies alloy plus temper; T651 is a related but separately designated condition.
Specific property examples
What distinguishes this material
Rod/bar typical strength can be compared only with a similarly described record; it is not a guaranteed minimum or welded-zone strength.
Designation in this reference
6061-T6
Forms covered by the sources
Rod
Bar
Sheet
Coil
Plate
States to distinguish or confirm
T6
T651 (separate stretched condition)
Temperature and exposure
No general service-temperature limit or temperature-independent strength is established by this page. Check the temperature and duration for the specific source table and application.
Other search names in these sources
6061 T6
Read the scope above: a source’s related product name is not a blanket interchangeability statement.
Property evidence for a stated condition
Read the complete example before using a number. Typical values are not guaranteed limits. Missing test conditions remain visible.
Specific source example
Kaiser rod and bar — typical tensile example
Product / specimen
Rod and bar; 0.500-inch diameter tensile specimen; stock section and direction not stated in this summary table
Condition
T6 / T651 grouped row; retain actual supplied suffix
Test temperature / environment
Not stated in the source mechanical table; do not assume or certify 20°C
Values apply to the example above
Property
Value
Meaning and method
Ultimate tensile strength
310 MPa
typical Source tensile table; 0.500-inch specimen; test standard not named
Yield strength
276 MPa
typical Source yield column; offset/test standard not stated
Is the stock T6 or T651 and which form, size, direction and specification govern it?
Obtain the full material certificate, governing specification/edition, product dimensions and test direction before adopting a property value.
For machining, take the exact grade, supplied condition and measured hardness where applicable into the tool maker’s application data. A generic material-family speed is not a substitute for an operation and tool-specific recommendation.
Source identity, a named product example and a supplied-batch certificate are different evidence. Cross-standard similarity does not approve substitution.
Corrections from the previous article
Retain 310 MPa only as the cited typical rod/bar example; remove the universal 300% machinability and generic speed range.
Remove the untraceable generic machining recommendation (300 %) and cutting-speed ranges; select machining data by actual material condition, tool and operation.