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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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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? |
#2
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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. |
#3
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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" |
#4
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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. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
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