⚙️ A2 Stainless Steel Serrated Flange Nuts – Self-Locking Metric Hex Nuts (M3 to M16)
🏷️ Brand: HomeDIYer Fastener | DIN6923 | A2-70
📌 Overview — No separate washer, no extra lock washer, no vibration loosening. Flanged nuts with a serrated face combine a wide load-bearing flange with an integrated locking mechanism into a single compact component. Ideal for automotive, industrial machinery, agricultural equipment, and any application where vibration threatens to loosen a standard nut. The serrations bite into the mating surface (when used against a softer material or properly torqued) to resist rotation. At the same time, the wide flange distributes clamp force and eliminates the need for a separate flat washer. Made from corrosion-resistant A2-70 stainless steel, these DIN6923 flange nuts deliver long-lasting performance in harsh environments. Perfect for mechanics, equipment builders, and DIYers who want faster assembly and reliable locking.
✨ Key Features of Serrated Flange Lock Nuts (A2 Stainless)
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Integral Serrated Face – The underside of the flange features serrations that bite into the bearing surface, creating friction and preventing loosening from vibration.
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Built-in Wide Flange – Eliminates the need for a separate flat washer; distributes load evenly and protects the work surface.
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A2-70 Stainless Steel (304 equivalent) – Excellent corrosion resistance for outdoor, marine, and industrial environments. No rust, no staining.
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Metric Coarse Threads (DIN6923) – Standard ISO metric sizes from M3 to M16, fully compatible with standard bolts and studs.
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Faster Assembly & Lower Parts Count – One nut replaces a nut + flat washer + lock washer, saving time and reducing inventory.
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Reusable with Caution – Serrated flange nuts can be reused, but the locking effectiveness may diminish after multiple cycles (replace for critical applications).
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Untreated Natural Stainless Finish – No coatings to chip; clean, professional appearance.
📏 Technical Specifications – Serrated Flange Nuts (DIN6923, Metric Coarse)
| Thread Size (Metric) |
Thread Pitch (mm) |
Spanner / Wrench Size (mm) |
Flange Diameter (mm) |
| M3 |
0.5 |
5.5 |
8.0 |
| M4 |
0.7 |
7.0 |
10.0 |
| M5 |
0.8 |
8.0 |
12.0 |
| M6 |
1.0 |
10.0 |
14.0 |
| M8 |
1.25 |
13.0 |
18.0 |
| M10 |
1.5 |
17.0 |
22.0 |
| M12 |
1.75 |
19.0 |
26.0 |
| M16 |
2.0 |
24.0 |
35.0 |
💡 Packaging & ordering: “As per Your Choice” – select the exact thread size and quantity you need. No mixed packs unless requested. All nuts are A2-70 stainless steel, untreated, and conform to DIN6923.
🔒 How the serrated locking works: The serrations are designed to bite into the bearing surface when tightened. For optimal locking, use against a material slightly softer than the nut (e.g., mild steel, aluminum, plastic) or ensure high clamp force against hardened surfaces. Do not use on finished/painted surfaces where marring is unacceptable.
❓ Frequently Asked Questions – Serrated Flange Lock Nuts
Do serrated flange nuts damage the surface they are tightened against?
⚠️ Yes, the serrations will leave marks or small indentations on most surfaces because they are designed to bite in for locking. For applications where surface appearance matters (e.g., painted panels, soft aluminum, plastic), use a flat washer under the nut or choose a non-serrated flange nut. For structural and industrial use, this marking is normal and indicates proper locking action.
Can I reuse these serrated flange nuts?
✅ Reuse is possible, but the locking effectiveness decreases with each installation. The serrations wear or flatten over time. For non-critical applications (e.g., temporary fixtures, non-safety assemblies), reuse is fine. For safety-critical or high-vibration environments, always install fresh nuts to ensure maximum locking performance.
Do I still need a separate washer with these flange nuts?
🔧 No. The integrated wide flange replaces a standard flat washer. However, if you need to protect a soft or finished surface from the serrations, you can place a plain flat washer between the nut and the surface – but this will reduce or eliminate the locking effect. For locking + surface protection, consider a nylon insert lock nut (Nyloc) instead.
What is the difference between DIN6923 and other flange nut standards?
📐 DIN6923 specifies metric hex flange nuts with serrated bearing face, coarse thread, and specific dimensions (flange diameter, height). It is the most common standard for serrated flange nuts in Europe and international markets. Our nuts meet these exact specifications, ensuring compatibility with standard metric bolts.
Are these nuts corrosion-resistant for outdoor use?
🌊 Yes – A2-70 stainless steel (304 grade) offers excellent resistance to moisture, humidity, and mild chemical exposure. They are suitable for outdoor furniture, automotive underbody, marine hardware (freshwater and coastal), and industrial equipment. For direct saltwater immersion or harsh chemical environments, consider A4 (316) stainless steel.
⚙️ HomeDIYer Fastener – Precision metric locking nuts for professionals and makers. Order the exact size you need today.
