The Metalworking Thread

[Wilhelm]

Grade 8 is the same RC scale as 12.9

But not the same tensile strength.
Hardness is not the only property of steel alloys.

 

[Squareground3691]

But not the same tensile strength.
Hardness is not the only property of steel alloys.

172 more MPa’s

 

[Wilhelm]

Or 26900 psi (150000 vs 176900) which sounds a bit more impressive but still comes out to about ~17% more.

Not trying to start a debate here.
Just saying 12.9 grade steel is impressive stuff.

 

[Al Smith]

" An ISO 12.9 grade bolt is roughly equivalent to an SAE J429 Grade 8 bolt, as both represent a high-strength fastener with similar tensile strength properties; however, it's important to note that exact comparisons might vary depending on the specific application and material used. "

The above said as far as I know I've never seen or used them.However I have made concave punchs from grade 8 bolts used to peen chainsaw chain rivets ,namely 1/2" chain used on antique gear drive saws .

 

[Wilhelm]

" An ISO 12.9 grade bolt is roughly equivalent to an SAE J429 Grade 8 bolt, as both represent a high-strength fastener with similar tensile strength properties; however, it's important to note that exact comparisons might vary depending on the specific application and material used. "

The above said as far as I know I've never seen or used them.However I have made concave punchs from grade 8 bolts used to peen chainsaw chain rivets ,namely 1/2" chain used on antique gear drive saws .

No, not really - unless +17% equals to roughly nothing.

ISO 10.9 is roughly equivalent to SAE Grade 8, just a smidge stronger too.

 

[Al Smith]

I think talk of extremely strong bolts related to chainsaws mostly are centered around rod cap bolts especially McCulloch .Of course only a hand full of people including myself get into them .On that talk of the special six spline head bolts gets mentioned .Some claim they are higher rated than a grade eight and I really don't know myself .I have substituted grade eight socket head grade eights after cutting the head size thinner because of clearance issues from the stuffer .The heads on a standard grade eight is softer the threaded portion of the bolt so it cuts rather easily using carbide .

 

[davidwyby]

 

[Wilhelm]

Mine is serving me well for almost 2 decades.


It holds what I may need from day to day.

 

[Wilhelm]

No excitement, no fuss - love it.
Pellet cast iron burn chamber, drilling air inlet holes and some mounting threads.

 

[Wilhelm]

@davidwyby

I own this little inverter flux core wire welder that is rated 120A/220Volt and it welds really well.
But it supports only 1.0mm thick wire max.

I also have a full box of 3.2mm stick electrodes that won't fire/melt at the max 105A/220Volt my transformer stick welder pushes.

Here is a crazy thought.

If I pull out the wire of my flux core welder and fab up an electrode clamp on its nozzle it should technically function as a stick welder - no?!

 

[Wilhelm]

Intended for heavy gauge nylon, might try chains too though.

 

[Boomer2230]

@davidwyby

I own this little inverter flux core wire welder that is rated 120A/220Volt and it welds really well.
But it supports only 1.0mm thick wire max.

I also have a full box of 3.2mm stick electrodes that won't fire/melt at the max 105A/220Volt my transformer stick welder pushes.

Here is a crazy thought.

If I pull out the wire of my flux core welder and fab up an electrode clamp on its nozzle it should technically function as a stick welder - no?!

Just hook your cables up inside the door.