Never seen a rusty one, so my guess is stainless.
Hello all.
I just wish to ask any outboard experts out there about the metal used in the Gear box bung plug in outboards, I presume it's made solid 316 stainless ?
Or could it be some other fancy made screw , say made of Monel or another mix of metals that don't cause reactions
in theory if it is Stainless going into cast there will be a reaction due to dissimilar metals (stainless) could eat away at the cast, but I presume the surface area of the thread of stainless that touches the cast is neutralized due to anodised installed on the leg and the fact small amount of stainless in a large amount of cast is ok, rather than a large amount of stainless and a small amount of dissimilar metal (cast).
I wish to double check. I have tried to contact my local dealer but they are unwilling due to possible liability strange, but anyway maybe they just didn't really know.
Never seen a rusty one, so my guess is stainless.
See if the screws magnetic. Stainless won’t have much effect with a magnet.
Saltwater fishing, boat mad but has a job that gets in the way.
Jack.
316 is ever so slightly magnetic, so I guess in a way the answer is no (kind of)
Thanks jack the bung plug I have is M10 1.25 fine thread but over the years of dumping oil and constantly buying the new washer I wish to find a better way, I found using a thicker nylon washer is perfect but it limits the thread length to fasten.
( new nylon washer is 2ml thick, standard washer is very thin and can sometime pinch and distort )
Genuine bung bolt is only 8 ml long.
searching for an M10 1.25 thread in a stainless 316 button head is not easy, what makes it even harder is I was hoping to get it in a button head Allen key socket.
thankyou again
I have seen them made from aluminium and stainless steel, Mick these days u can get anything made just find someone with a lathe and they willspin one up for u
thanks Gazza thats a great idea. I know just the person Its actually right in front of my face. My next door neighbour does all that metal work.
If your neighbour has a mill a added bonus he/she can machine whatever head u want on the screw