Ever wondered why one bolt holds steady for decades, while another loosens faster than a bloke’s grip on Dry July? It’s not magic — it’s science.

Whether you're building a deck, fixing a boat trailer, or trying to stop your shed door falling off again, the fasteners you use matter.

If you’ve spent more than ten minutes near saltwater with a tackle box in hand, you already know this: the ocean is not kind to anything made of inferior metal.

At Bolt-In Co Sunshine Coast, we stock all kinds of fasteners — from the humble coach screw to the kind of bolt you’d use to keep a tank’s wheels on. Somewhere near the top of the strength food chain? That’d be your Grade 12.9 steel bolts.

If you’re a boatie, you already know: stainless is non-negotiable. You wouldn’t trust your hull to mild steel, so why trust your hardware?

What exactly goes into making this ultra-tough steel?

If you’ve ever snapped a cheap bolt in half and stared at it in frustration, wondering why it failed, chances are you weren’t using 12.9 grade steel. Learn more about Grade 12.9 fasteners in this article.

Discover top-quality nuts, bolts, and fasteners with Bolt-In Co, the Sunshine Coast’s trusted supplier. Get the right fastener for the job—because solid work starts with the best hardware!

In this article, we take a look at the considerations when comparing two fundamentally different types of bolts - namely, 12.9 grade alloy steel fasteners and stainless steel fasteners.