Buy Hex Head Flanged Bolts Online in Australia
Hex Head Flanged Bolt Selection — Quick Reference
Hex head flanged bolts combine standard hex head with an INTEGRAL FLANGE that acts as built-in washer — eliminates separate washer + provides load distribution + prevents loosening under vibration. Used widely in automotive + machinery + production assembly.
| Flanged Bolt Type | Best For |
|---|---|
| Smooth Flange (No Serrations) | General fastening — flange = built-in washer |
| Serrated Flange (Toothed) | Anti-vibration + anti-loosening — serrations bite mating surface |
| Grade 8.8 (Zinc-Plated) | Workshop default — medium tensile + corrosion protection |
| Grade 10.9 (Black Oxide) | Higher tensile applications — engineering + machinery |
| Stainless 304 / 316 | Corrosion-resistant flanged fastening |
| Metric Sizes (M5 – M16+ typical) | Standard workshop range |
| Matched Flanged Nuts | Companion flanged nut — pairs with flanged bolt |
Why flanged: Built-in flange ELIMINATES separate washer (faster assembly + less component count). SERRATED flange replaces lock washer in many applications. Common in production lines + automotive + machinery where assembly speed matters. Critical: Serrated flange bites mating surface — leaves marks on painted surfaces + finished work. Use smooth-flange for cosmetic + finished applications; serrated for unpainted structural + anti-loosening critical. Brands: Bremick, Hobson, Champion. Companion: hex bolts + nuts, fasteners, lock washers.
Hex Head Flanged Bolts — Flange Head Bolts for Vibration Applications
Hex head flanged bolts combine a hex head with an integral flange that functions as a built-in washer — eliminating a separate washer component and providing load distribution and (in the serrated variant) vibration resistance in a single fastener. AIMS Industrial sells hex head flange bolts in metric Grade 8.8 for automotive, agricultural machinery, and structural fastening applications.
Hex Head Flanged Bolts We Stock
- Non-Serrated Flange Bolts: Smooth-flange hex bolts for applications requiring a washer face without the anti-rotation function of serrations — preferred on finished, coated, or anodised surfaces where serrations would damage the surface treatment.
- Serrated Flange Bolts: Serrated (toothed) flange bolts bite into the mating surface at first tightening, providing a vibration-resistant fastener that reduces the risk of loosening without a separate lock washer. Widely used in automotive assemblies, agricultural machinery, and vibration-loaded plant.
- Grade 8.8 Alloy Steel: Metric Grade 8.8 alloy steel hex flange bolts — the standard strength class for automotive and machinery applications. Grade 10.9 variants available for higher-load applications.
- Metric Range M6 to M16: Hex head flange bolts in the most commonly required metric sizes for automotive, machinery guarding, and enclosure fastening.
Flange Bolt Application Guide
- One-Piece Assembly Advantage: Replacing a bolt + washer assembly with a flanged bolt reduces part count, simplifies assembly, and eliminates the risk of the washer spinning or falling during installation in hard-to-access locations — a significant benefit in high-production assembly and maintenance operations.
- Serrated Flange Locking — One-Time Use: Serrated flange bolts are most effective on first installation — the serrations create new impressions in the mating surface. Reinstalling in the same position has reduced locking effect. Replace serrated flange bolts on critical joint re-assembly.
- Flange Clearance: The flange OD is larger than the bolt hex across-flats — ensure sufficient clearance for the flange at the joint before specifying flange bolts. In tight bolt patterns, the flange may foul adjacent flanges or surfaces.
Australian Business, Local Supply: As a proudly Australian business since 1988, we stock locally and work with trusted local Australian manufacturers and distributors to ensure fast, reliable supply.
Expert Support: Need help buying the right product for your application? Contact our team for application-specific advice or request a quote.
See our full fasteners range including hex bolts and nuts, flanged nuts, and lock washers.
People Also Ask — Hex Head Flanged Bolts
Q: Smooth or serrated flange bolt — which do I need?
Use a smooth (non-serrated) flange bolt on finished, coated, painted or anodised surfaces — the serrations on a serrated flange bolt will bite into and damage a cosmetic or protective surface finish. Use a serrated flange bolt on unpainted structural or machinery joints where anti-vibration performance matters, since the serrations grip the mating surface and resist loosening.
Q: Can I reuse a serrated flange bolt?
Serrated flange bolts are most effective on first installation — the serrations create fresh impressions in the mating surface that provide the anti-loosening grip. Reinstalling the same bolt in the same position has reduced locking effect because those impressions are already formed, so replace serrated flange bolts on critical joint re-assembly rather than reusing them.
Q: What's the advantage of a flanged bolt over a bolt plus a separate washer?
A flanged bolt's integral flange replaces the separate washer, reducing part count and simplifying assembly — there's no risk of a loose washer spinning off or falling out of reach during installation, which matters in hard-to-access or high-production assembly work. The flange still spreads load the same way a washer would, but as a single fastener.
Q: Do flanged bolts need extra clearance around the head?
Yes — the flange outside diameter is larger than the bolt's hex across-flats, so check there's enough clearance for the flange at the joint before specifying a flanged bolt. In tight bolt patterns, the flange can foul adjacent flanges or nearby surfaces in a way a standard hex bolt with a separate washer wouldn't.