top of page
spn-stainless-self-locking-retaining-ring-sus304.png.png

Self-Locking Retaining Ring(SPN)

SPN Self-Locking Nut is designed with an elastic retaining structure, available in either single-piece or toothed styles. Once installed, it provides reliable resistance against vibration, axial load, and repeated stress, effectively preventing loosening or displacement. This makes it highly suitable for mechanical assemblies requiring precision and stability.

This series is available in two material options:

  • Carbon Steel (Black Oxide Finish): Offers high strength and wear resistance, with added surface protection against rust. An economical choice for general industrial applications.

  • Stainless Steel SUS304: Excellent corrosion resistance combined with high strength and long-term reliability. Ideal for outdoor equipment, automation systems, semiconductor devices, and medical machinery.

Standard: JIS B 1216

​​

Product Features

  • Anti-loosening design: Equipped with elastic tension or interlocking hooks to prevent displacement under vibration

  • Installation method: Press-fit into groove; generates holding force automatically

  • Material: SUS304 Stainless Steel

  • Structure types: May include spring tab, tooth-lock, or dual-hook styles depending on size and application

  • Size range: For shaft diameters Φ3mm–Φ50mm (custom sizes available upon request)

​​​​​

Applications

  • Anti-loosening retention for precision drive systems

  • Structures subject to continuous vibration in automation equipment

  • Corrosion-prone environments and outdoor installations

  • Secure fastening in medical devices, control units, and sensor assemblies

Reference Terminology / Common Names

  • Self-Locking Retaining Ring

  • Anti-Vibration Ring (Stainless Steel)

  • Double-Lug Ring

  • Common Industry Terms: SPN, SLR, Self-Lock Ring

bottom of page