EN 3645-009:2019

• Abstract:

  This European Standard specifies the characteristics of jam nut mounting receptacles in the family of; circular, electrical connectors, with triple start threaded coupling.; It applies to models in Table 3.; For plugs and protective covers, see EN 3645-006, EN 3645-008, EN 3645-011 and EN 3645-012 respectively.; For sealing plugs and cable outlet accessories associated with this receptacle, see EN 3645-002.; These connectors are derived from and interchangeable with models W, F, J, M, Z, T and K in specification; MIL-DTL-38999/24.

• Status: Published
• Publication Date: 26-Mar-2019
• Withdrawal Date: 29-Sep-2019
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 2 - Electrical
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-Jan-2025
• Completion Date: 02-Sep-2026
• Ref Project: SIST EN 3645-009:2019 - Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded coupling, operating temperature 175 °C or 200 °C continuous - Part 009: Receptacle, round flange, jam nut mounting - Product standard

• Replaces: EN 3645-009:2006 - Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded coupling, operating temperature 175 °C or 200 °C continuous - Part 009: Receptacle, round flange, jam nut mounting - Product standard
• Effective Date: 03-Apr-2019
• Refers: EN 3645-001:2022 - Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded coupling, operating temperature 175 °C or 200 °C continuous - Part 001: Technical specification
• Effective Date: 28-Jan-2026
• Refers: EN 3645-002:2024 - Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and contact arrangements
• Effective Date: 28-Jan-2026
• Referred By: EN 3155-008:2026 - Aerospace series - Electrical contacts used in elements of connection - Part 008: Contacts, electrical, male 008, type A, crimp, class S - Product standard
• Effective Date: 15-Apr-2026
• Referred By: EN 3155-002:2024 - Aerospace series - Electrical contacts used in elements of connection - Part 002: List and utilization of contacts
• Effective Date: 28-Jan-2026
• Referred By: EN 3660-063:2015 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 063: Cable outlet, style K, straight, for heat shrinkable boot, shielded, sealed, self-locking for EN 3645 - Product standard
• Effective Date: 28-Jan-2026
• Referred By: EN 3645-008:2015 - Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded coupling operating temperature 175 °C or 200 °C continuous - Part 008: Non release plug with grounding ring - Product standard
• Effective Date: 28-Jan-2026
• Referred By: EN 3660-002:2006 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 002: Index of product standards
• Effective Date: 28-Jan-2026
• Referred By: EN 2591-318:2018 - Aerospace series - Elements of electrical and optical connection - Test methods - Part 318: Fire-resistance
• Effective Date: 28-Jan-2026
• Referred By: EN 3645-002:2015 - Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded coupling, operating temperature 175 °C or 200 °C continuous - Part 002: Specification of performance and contact arrangements
• Effective Date: 28-Jan-2026
• Referred By: EN 3660-063:2009 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 063: Cable outlet, style K, straight, for heat shrinkable boot, shielded, sealed, self-locking for EN 3645 - Product standard
• Effective Date: 28-Jan-2026
• Referred By: EN 3645-011:2006 - Aerospace series - Connectors, electrical, circular, scoop-proof, triple start threaded coupling, operating temperature 175 °C or 200 °C continuous - Part 011: Lanyard release plug with grounding fingers - Type 1 - Product standard
• Effective Date: 28-Jan-2026
• Referred By: EN 3660-021:2009 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 021: Cable outlet, style A, 90°, unsealed, self-locking with clamp strain relief for EN 3645 - Product standard
• Effective Date: 28-Jan-2026
• Referred By: EN 3660-062:2009 - Aerospace series - Cable outlet accessories for circular and rectangular electrical and optical connectors - Part 062: Cable outlet, style K, 90°, for heat shrinkable boot, shielded, sealed, self-locking for EN 3645 - Product standard
• Effective Date: 28-Jan-2026
• Referred By: EN 4531-001:2012 - Aerospace series - Connectors, optical, circular, single and multipin, coupled by triple start threaded ring - Flush contacts - Part 001: Technical specification
• Effective Date: 28-Jan-2026

Overview

EN 3645-009:2019 is a European standard published by CEN, defining requirements for aerospace electrical connectors, specifically circular, scoop-proof connectors with triple start threaded coupling and continuous operating temperatures of 175 °C or 200 °C. This part of the EN 3645 series focuses on receptacles with a round flange and jam nut mounting. Applicable to both military and civil aerospace environments, these connectors are engineered for reliability in harsh operating conditions, supporting the critical needs of electrical systems aboard aircraft.

Key Topics

• Connector Design: Specifies the round flange, jam nut mounting style, which allows secure and robust attachment to panels.
• High Temperature Resistance: Designed for continuous operation at either 175 °C or 200 °C, making these connectors suitable for high-stress aerospace applications.
• Scoop-Proof Construction: Supports enhanced safety and reliability by preventing accidental contact damage during mating and unmating.
• Triple Start Threaded Coupling: Provides quick, secure, and vibration-resistant mating, which is essential in aerospace applications.
• Material Options: Includes aluminum, stainless steel, and composite materials with various plating options for resistance to corrosion and environmental degradation.
• Interchangeability: Derived from and compatible with MIL-DTL-38999/24 models, ensuring ease of integration and replacement in global aerospace supply chains.
• Multiple Configurations: Available with different shell sizes, contact arrangements, and resistance options (fluid, salt spray, etc.).
• Designation System: Uses a structured marking and ordering code for effective specification and traceability within the aerospace industry.

Applications

EN 3645-009:2019 connectors are widely used in aerospace electrical systems where reliability and endurance are paramount. Key applications include:

• Aircraft Electrical Harnesses: Ensuring secure interconnections for critical avionics, power supplies, sensors, and control systems.
• Military and Civil Aviation: Suitable for use in both commercial airliners and defense platforms, supporting mission-critical performance.
• Aerospace Equipment Manufacturing: Integrates seamlessly into equipment such as flight data recorders, communication modules, lighting systems, and engine control units.
• Retrofit and Maintenance: Due to standardization and interchangeability, these connectors simplify upgrades and replacements in existing fleets.
• Harsh Environment Electronics: The robust design and finishes are particularly valuable in environments exposed to vibration, temperature extremes, humidity, and corrosive agents.

Related Standards

For a complete understanding and implementation of the EN 3645 series, the following related standards should be considered:

• EN 3645-001: Technical specification for aerospace circular, scoop-proof connectors.
• EN 3645-002: Details performance requirements and contact arrangements.
• EN 3645-006: Product standard for protective covers for receptacles.
• EN 3645-008 and EN 3645-011/012: Standards for related plug configurations and lanyard release plugs.
• MIL-DTL-38999/24: U.S. military specification outlining compatible connector models, often referenced for interchangeability.
• EN 3155 series: Relevant for contact coding and arrangement in these connectors.

Practical Value

Adhering to EN 3645-009:2019 ensures:

• Quality Assurance: Confirms reliable operation in mission-critical aerospace electrical systems.
• Safety and Compatibility: Enhances system safety by adhering to proven design features and international compatibility.
• Reduced Maintenance and Downtime: Enables quick, accurate identification, replacement, and servicing of connectors.
• Regulatory Compliance: Facilitates compliance in both European and global aerospace sectors.

Using EN 3645-009:2019 connectors is a best practice in aerospace electrical interconnections, ensuring high performance, durability, and global interoperability.