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Stainless Steel Nylock Acorn Cap Nut M4–M12 304 Dome Hex Self-Locking Locknut
Stainless Steel Nylock Acorn Cap Nut M4–M12 304 Dome Hex Self-Locking Locknut
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Stainless Steel Nylock Acorn Cap Nut M4–M12 — 304 Dome Hex Self-Locking Locknut
304 stainless steel Nylock acorn dome cap nuts combine two functions in one fastener: the protective dome of an acorn cap nut that covers and shields exposed bolt ends, and the nylon insert of a nyloc nut that provides self-locking vibration resistance. This dual-function design is ideal for applications where both bolt end protection and anti-loosening performance are required — such as outdoor equipment, automotive builds, and safety-critical assemblies.
Key Specifications
| Parameter | Value |
|---|---|
| Material | 304 Stainless Steel |
| Locking Mechanism | Nylon insert (Nylock / nyloc) |
| Head Style | Dome cap (acorn / blind) |
| Thread Type | Metric coarse |
| Size Range | M4, M5, M6, M8, M10, M12 |
| Drive | Hex (spanner / socket) |
Why Choose Nylock Acorn Cap Nuts?
- Dual function — dome cap protects exposed bolt end from injury and corrosion; nylon insert provides self-locking vibration resistance in a single component
- Nylon insert locking — nylon collar deforms around bolt thread on installation, creating friction that resists loosening under vibration without damaging the thread
- 304 stainless steel — corrosion-resistant for outdoor, marine, and humid environments
- No separate lock washer needed — self-locking nylon insert eliminates the need for a separate lock washer or thread-locking compound
- M4–M12 range — covers light mechanical (M4–M6) through structural assembly (M8–M12)
Typical Applications
- Outdoor and playground equipment — covering sharp bolt ends for safety + vibration resistance
- Automotive and motorcycle custom builds — decorative dome cap with anti-loosening performance
- Marine and boat hardware — stainless dome cap protects bolt ends from saltwater corrosion
- Electronics enclosure assembly — covering internal bolt ends with anti-loosening protection
- Bicycle and e-bike component mounting (M5–M8)
- Industrial machinery with vibration exposure (M8–M12)
Compatible With
- Standard metric coarse thread bolts and studs M4–M12
- Spanner / socket: M4=7mm, M5=8mm, M6=10mm, M8=13mm, M10=17mm, M12=19mm AF
- Note: nylon insert limits maximum service temperature to approximately 120°C
Package Contents
- Nylock acorn dome cap nuts in selected size and quantity (per variant)
Frequently Asked Questions
- Q: Can Nylock acorn cap nuts be reused?
- A: Nyloc nuts lose some locking effectiveness each time they are removed and reinstalled, as the nylon insert deforms permanently on first use. For safety-critical applications, replace nyloc nuts after each removal. For non-critical applications, they can typically be reused 2–3 times if the nylon insert still provides resistance.
- Q: What is the maximum temperature for the nylon insert?
- A: The nylon insert has a maximum continuous service temperature of approximately 120°C. For higher temperature applications (e.g., near exhaust systems or power electronics), use an all-metal locking nut (prevailing torque nut) instead.
- Q: How does a Nylock acorn nut differ from a standard acorn nut?
- A: A standard acorn nut (DIN1587) has no locking mechanism and can loosen under vibration. A Nylock acorn nut adds a nylon insert that provides self-locking vibration resistance. Choose Nylock when both bolt end protection and anti-loosening performance are required.
