DIN985-M6-A2 - Diamond Aircraft OEM Hex Head Self-Locking PA Insert Aerospace Nut

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DIN985-M6-A2 - Diamond Aircraft OEM Hex Head Self-Locking PA Insert Aerospace Nut

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DIN985-M6-A2 – Diamond Aircraft OEM Hex Head Self-Locking PA Insert Aerospace Nut

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Overview

The DIN985-M6-A2 is a genuine OEM self-locking hex nut specified for use by Diamond Aircraft in numerous applications across their fleet. This fastener is manufactured to the precise DIN 985 (Deutsches Institut für Normung) industrial standard, a globally recognized specification for prevailing torque type hexagon nuts with a non-metallic insert. The "A2" designation signifies it is fabricated from A2 grade stainless steel, offering excellent corrosion resistance. The integrated Polyamide (PA), or nylon, insert provides a reliable locking feature, making this nut a durable and vibration-resistant solution for a wide range of non-structural and secondary structural attachments.

Key Features

  • Nylon Insert Self-Locking Mechanism: Features an integrated nylon (polyamide) collar that is elastically deformed when a screw is threaded through it. This creates a powerful frictional grip on the bolt threads, providing prevailing torque that prevents loosening under constant airframe and engine vibration.
  • A2 Stainless Steel Construction: Fabricated from A2 grade stainless steel (equivalent to 304 stainless steel), which offers superior corrosion resistance compared to standard zinc-plated carbon steel nuts. This makes it ideal for applications exposed to moisture and the elements.
  • DIN 985 Standard: Manufactured in strict accordance with the DIN 985 standard, ensuring precise metric dimensions, thread quality, and locking performance for consistent and reliable installations.
  • Reusable Locking Action: While it is always best practice in aviation to use new self-locking hardware, DIN 985 nuts can often be reused a limited number of times, provided their prevailing torque value remains within the specifications outlined in the maintenance manual.
  • OEM Specification: As a component specified by Diamond Aircraft, it guarantees the correct material, strength class, and performance characteristics required for a fully airworthy installation on their certified aircraft.

Technical Specifications

  • Standard: DIN 985 (equivalent to ISO 10511)
  • Full Part Number: DIN985-M6-A2
  • Component Type: Hexagon Nut with Polyamide (Nylon) Insert
  • Material: A2 Grade Stainless Steel
  • Finish: Plain / Passivated
  • Thread Specification: M6 x 1.0
    • Nominal Diameter: 6 mm
    • Thread Pitch: 1.0 mm (Coarse Thread)
  • Wrench Size: 10 mm
  • Height: Approximately 6 mm
  • Temperature Limitation: The nylon insert typically limits the continuous operating temperature to approximately 250°F (121°C).

Aircraft Compatibility

The DIN985-M6-A2 nut is a standard component used in various locations on modern composite aircraft like those produced by Diamond. Its use is determined by the engineering requirements for a corrosion-resistant, vibration-proof, metric fastener.

  • Compatible Aircraft Models:
    • Diamond DA20 Katana
    • Diamond DA40 / DA40NG Star
    • Diamond DA42 Twin Star
    • Diamond DA62
  • Common Applications:
    • Securing inspection panels, fairings, and non-structural brackets.
    • Mounting engine baffles and accessories.
    • Fastening interior components, seating, and systems hardware.
    • Securing various clamps and routing provisions for wiring and fluid lines.

Applications

This self-locking nut is the ideal choice for creating secure bolted joints in high-vibration environments:

  • Non-Structural Attachments: The primary fastener for countless joints where a reliable locking feature is needed but the extreme strength of a high-temperature, all-metal locknut is not required.
  • Corrosion-Prone Areas: The A2 stainless steel construction provides a durable solution for hardware on the aircraft exterior or in areas susceptible to moisture.
  • Serviceable Joints: Allows for secure fastening of components that may require periodic removal for service, providing a reliable locking action upon reinstallation (subject to torque check).

Why Choose DIN985-M6-A2?

Using the correct, specified hardware is fundamental to maintaining the safety and airworthiness of a sophisticated aircraft like a Diamond. The DIN985-M6-A2 nut provides the exact combination of metric sizing, stainless steel corrosion resistance, and reliable nylon-insert locking performance required by the manufacturer. Substituting with a non-certified nut of a different material or lower quality can lead to corrosion, loss of clamping force due to vibration, and potential failure of the component it secures. For a professional and compliant repair, trust only genuine OEM-specified hardware.

Order Your DIN985-M6-A2 Nuts Now

Ensure your Diamond aircraft is maintained to factory standards with genuine OEM hardware. Visit Airparts.aero to order your DIN985-M6-A2 self-locking nuts today.

The locking action of the DIN985-M6-A2 nut is created by the polyamide insert at the top of the nut, which has a smaller inner diameter than the bolt's major thread diameter. As the bolt is threaded into the nut, it forces its way into the nylon insert. The elasticity of the nylon allows it to deform and tightly grip the bolt threads. This creates a constant, high-friction state known as prevailing torque, which resists the rotational forces of vibration. The A2 stainless steel body provides a stable, non-corrosive platform for this locking mechanism, ensuring that the joint remains secure and serviceable throughout its operational life.

Note: This is a flight-critical fastener. Always use a calibrated torque wrench to tighten to the value specified in the current Diamond Aircraft Maintenance Manual. While reusable, the prevailing torque should be checked upon re-installation to ensure the locking feature has not worn out. If the specified minimum torque is not met, the nut must be replaced.

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