goofy bolt headstamps
 

How common is this- inch threaded fasteners with metric grades stamped on
the head?

Came across some "12.9" stamped allen head bolts with a real 5/16-18
thread. Does anybody in Taiwan ever stamp grade the grade 5 or grade 8
lines on metric fasteners?

goofy bolt headstamps
 

On Sat, 9 Mar 2019 02:19:11 +0000 (UTC), Cydrome Leader
wrote:

How common is this- inch threaded fasteners with metric grades stamped on
the head?

Came across some "12.9" stamped allen head bolts with a real 5/16-18
thread. Does anybody in Taiwan ever stamp grade the grade 5 or grade 8
lines on metric fasteners?


A class 12.9 bolt is described as being "alloy steel quenched and
tempered" and has a minimum tensile strength of 1220 MPa, which is
about 176,946 psi.


--
Cheers,
John B.

goofy bolt headstamps
 

On Sat, 9 Mar 2019 02:19:11 +0000 (UTC), Cydrome Leader
wrote:

How common is this- inch threaded fasteners with metric grades stamped on
the head?

Came across some "12.9" stamped allen head bolts with a real 5/16-18
thread. Does anybody in Taiwan ever stamp grade the grade 5 or grade 8
lines on metric fasteners?

12.9 grade steel means that a component manufactured form this grade
of steel has 12X100 N/mm^2 tensile strength and 9 is a multiplier
means 90% of 1200 = 1080 N/mm^2 is the yield strength of the grade.
Similarly we also have grade 8.8 , 10.9 , 6.8 also.

Not COMMON, particulary in non-metric countries, but I imagine not
uncommon in "metric" countries where an SAE threaded bolt is required.

Much more "descriptive" than "grade 3, Grade 5, or Grade 8"

goofy bolt headstamps
 

On Fri, 08 Mar 2019 22:57:33 -0500, Clare Snyder
wrote:

On Sat, 9 Mar 2019 02:19:11 +0000 (UTC), Cydrome Leader
wrote:

How common is this- inch threaded fasteners with metric grades stamped on
the head?

Came across some "12.9" stamped allen head bolts with a real 5/16-18
thread. Does anybody in Taiwan ever stamp grade the grade 5 or grade 8
lines on metric fasteners?

12.9 grade steel means that a component manufactured form this grade
of steel has 12X100 N/mm^2 tensile strength and 9 is a multiplier
means 90% of 1200 = 1080 N/mm^2 is the yield strength of the grade.
Similarly we also have grade 8.8 , 10.9 , 6.8 also.

Not COMMON, particulary in non-metric countries, but I imagine not
uncommon in "metric" countries where an SAE threaded bolt is required.

Much more "descriptive" than "grade 3, Grade 5, or Grade 8"

I regularly run into metric heads on SAE threaded fasteners on
machinery

__

"Poor widdle Wudy...mentally ill, lies constantly, doesnt know who he is, or even what gender "he" is.

No more pathetic creature has ever walked the earth. But...he is locked into a mental hospital for the safety of the public.

Which is a very good thing."

Asun rauhassa, valmistaudun sotaan.


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