Nissan Part Number 12315-H6200 BOLT-FLYWHEEL (6, 10mm)

These are high strength carbon steel

I dunno about the Nissan bolts.

However, check for a Mill Supply Store with the Grade 8 equiv that you guys on the bottom of the world use, err 12.9 ? is that close.

Fastenall Bolt company is a reputable dealer.
There's a world of info on their site.
www.fastenal.com/web/products.ex?N=999600001

BEWARE of bolts with No Company Logo on the head, or nuts with NO slashes around the perimeter.

We know about Nissan, they have quality parts.

Grade 8 bolts won't work as only the oldest A12s used Imperial threads. He needs Metric bolts for A14 engine, the kind we use here in America.

Aidan, why don't you just listen to the voice of experience, ask Ian what he does, (I know what the answer will be) If you don't have a contact for him let me know and I will pass one onto you.

If when you have a look at your crank and it is damaged, let me know and I will swap it for one of the ones that I have here to help you out, I don't use A14 cranks and I'm pretty sure I have a couple of lighter weight ones here.

a quick note - we use the grade 5 and grade 8 terminology downunder, in the same way you guys do for 'imperial' bolts (or whatever they are called)

iirc the metric equivalent of grade 8 is called 8.8 - might match up with you guys as well?

The metric 10.9 is the equivalent of a Grade 8 "inch" bolt

crikey this thread took off! getting some good info and resolution here. Wouldn't Ian say he gets Jeff Taylor to do it like the Adelaide grenade?(copyright pending on that term of endearment for the classic Adelaide motor) I haven't seen him in a while it'd be nice to catch up and see how he's going. Gary if you recall I bought one of your A14 cranks, in fact I had a small world moment when I noticed you used the same box that PKZ sent you to ship it up here.

Though a lighter one would be nice...swaps?

so what grade would i use for a high powered a15 that pulls burnouts almost every day

When you next pull your motor apart, send me down your crank and I will send you up a scalloped 1400 crank.

Jeff builds the motors, Ian bolts on all of his external parts.

Spoke to Ian yesterday, he might be down in Brisbane in the next couple of weeks, I have some parts put aside for him for his new car, if it works out I will give him the crank to take up to your area.

pulled the motor out yesterday and it wsn't as bad as I thought it could be which is nice. No snapped bolts, they were all about 1mm off holding any tension so the crank and flywheel have exchaned some material. I could have the crank off but I'm going out to a new suburb to help a guy tune his cortina. Will have it off during the week