Stainless Steel Flange Lock Nuts Nylon Insert Hex M3–M16
Stainless Steel Flange Lock Nuts Nylon Insert Hex M3–M16
Stainless Steel Flange Lock Nuts with Nylon Insert — M3 to M16
Keep your assemblies tight and secure with these heavy-duty Stainless Steel Flange Lock Nuts. Combining a nylon insert locking ring with an integrated flanged base, these hex nuts are engineered to resist loosening under vibration, rotation, and repeated use — making them ideal for machinery assembly, automotive maintenance, furniture hardware, equipment repair, and general DIY fastening projects.
Made in Mainland China.
Key Features
- Nylon Insert Locking Design: An internal nylon ring grips the bolt thread and resists self-loosening caused by vibration and dynamic movement, providing a secure, long-lasting hold.
- Integrated Flanged Base: The built-in flange increases the bearing surface area, distributing clamping force more evenly and reducing the chance of pull-through on softer materials.
- Stainless Steel & Nylon Construction: Bright silver stainless steel body offers strong corrosion resistance and durability; suitable for hardware fastening and general mechanical use.
- Standard Hex Profile: Compatible with common wrenches, socket sets, and hand tools for fast, hassle-free installation and removal.
- Wide Size Range: Available in M3, M4, M5, M6, M8, M10, M12, and M16 thread sizes to cover a broad spectrum of fastening applications.
Detailed Specifications
| Size | Hex Width | Height | Flange Diameter | Pitch |
|---|---|---|---|---|
| M3 | 5.5 mm (0.22") | 5.0 mm (0.20") | 8.0 mm (0.31") | 0.5 mm |
| M4 | 7.0 mm (0.28") | 6.0 mm (0.24") | 10.0 mm (0.39") | 0.7 mm |
| M5 | 8.0 mm (0.31") | 7.1 mm (0.28") | 11.8 mm (0.46") | 0.8 mm |
| M6 | 10.0 mm (0.39") | 9.1 mm (0.36") | 14.2 mm (0.56") | 1.0 mm |
| M8 | 13.0 mm (0.51") | 11.1 mm (0.44") | 17.9 mm (0.70") | 1.25 mm |
| M10 | 15.0 mm (0.59") | 13.5 mm (0.53") | 21.8 mm (0.86") | 1.5 mm |
| M12 | 18.0 mm (0.71") | 16.1 mm (0.63") | 26.0 mm (1.02") | 1.75 mm |
| M16 | 24.0 mm (0.94") | 20.3 mm (0.80") | 34.5 mm (1.36") | 2.0 mm |
Package Contents
- M3 / M4 / M5 — 20 pcs Flange Lock Nuts each
- M6 — 10 pcs Flange Lock Nuts
- M8 / M10 / M12 — 5 pcs Flange Lock Nuts each
- M16 — 1 pc Flange Lock Nut
Common Applications
- Machinery assembly & industrial equipment
- Automotive maintenance & repair
- Furniture hardware & woodworking projects
- General DIY home improvement & workshop tasks
- Electronics enclosures & structural brackets
Looking for more useful hardware and workshop accessories? Check out our Silicone Grease Lubricant for O-Rings, our Silicone Sealant Scraper Set, or our Multi-Use Faucet Bubbler Wrenches.
Note: Slight color variation may occur due to different monitor settings. Minor dimensional tolerances are possible due to manual measurement.
Learn more: OSHA on personal protective equipment
Frequently Asked Questions
Q: What is the difference between a standard hex nut and a flange lock nut?
A: A standard hex nut provides a flat bearing surface on one side, while a flange lock nut features an integrated wide flange that spreads the clamping load over a larger area. These stainless steel flange lock nuts also include a nylon insert ring that grips the bolt thread to resist self-loosening under vibration — making them far more secure than a plain hex nut in dynamic applications.
Q: Are these flange lock nuts reusable?
A: Nylon insert lock nuts can typically be reused a limited number of times. The nylon ring retains most of its grip after initial use, but for critical safety applications it is best practice to replace them after each removal to maintain optimal locking performance.
Q: Which thread sizes are available and how many pieces are included?
A: These stainless steel hex flange lock nuts are available in M3, M4, M5, M6, M8, M10, M12, and M16. Smaller sizes (M3–M5) include 20 pcs, M6 includes 10 pcs, M8–M12 include 5 pcs each, and M16 includes 1 pc per order.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.