MS25036-149 - Red Cable Socket Terminal Ring

MS25036-149 – Mil-Spec Red Insulated Ring Terminal for #10 Stud

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Overview

The MS25036-149 is a military-specification, pre-insulated, crimp-style ring terminal engineered for creating exceptionally reliable and durable electrical connections in the demanding environment of an aircraft. This is not a common automotive or commercial terminal; it is a precision component manufactured to the stringent MS25036 standard, which dictates its material composition, dimensional tolerances, and performance. The red nylon insulation signifies that this terminal is designed for use with 22 to 18 AWG wire, while the "-149" designation specifies a ring tongue sized for a #10 stud. The core of the terminal is made from high-conductivity, tin-plated copper and features a brazed barrel seam and a separate metal sleeve for insulation grip.

Properly crimped with a calibrated tool, this terminal creates a cold-weld, gas-tight connection that is mechanically robust and electrically stable. Its function is to provide a secure and corrosion-resistant termination point for a wire, allowing it to be fastened to a terminal block, ground stud, or component post. For any electrical work in a certified aircraft, the use of mil-spec terminals like the MS25036-149 is a fundamental requirement for safety and airworthiness.

Key Features

• Mil-Spec Certified: Manufactured and tested in strict accordance with MS25036, guaranteeing quality, performance, and traceability.

• Color-Coded for Wire Gauge: The red nylon insulation provides a quick and reliable visual identification for its intended wire size (22-18 AWG).

• High-Conductivity Copper Core: Made from tin-plated, oxygen-free high-conductivity (OFHC) copper for minimal resistance and voltage drop.

• Nylon Insulation Sleeve: The high-quality nylon insulator resists abrasion, impact, and degradation from aviation fluids (oil, fuel, hydraulic fluid) and is self-extinguishing.

• Insulation Grip for Strain Relief: A separate metal sleeve under the nylon insulation crimps onto the wire's insulation, providing superior strain relief and protecting the wire strands from fatigue and vibration-induced breakage.

• Brazed Barrel Seam: Prevents the barrel from splitting open during the crimping process, ensuring a complete, 360-degree connection.

Technical Specifications

• Part Number / Specification: MS25036-149

• Component Type: Insulated Ring Tongue Terminal

• Wire Size Range (Color): 22 - 18 AWG (Red)

• Stud Size: #10

• Material (Body): Tin-Plated Copper per ASTM B545 and B152.

• Material (Insulation): Nylon

• Barrel Style: Brazed Seam with Insulation Grip Sleeve.

• Maximum Temperature: 105°C (221°F)

• Maximum Voltage: 600V

• Governing Specification: MS25036

Aircraft Compatibility

• Universal Aerospace Application: This is a standard mil-spec terminal used in the manufacturing and maintenance of virtually all certified aircraft, including those from:

  • Textron Aviation (Cessna, Beechcraft), Piper, Cirrus, Boeing, Airbus, Bombardier, Gulfstream, and military aircraft.

Note: The correct terminal selection must be verified against the aircraft's wiring diagrams and maintenance or structural repair manuals.

Applications

• Avionics & Instrumentation: Terminating wires for connection to avionics units, instruments, and circuit breaker panels.

• General Electrical Systems: Used in lighting, control, and power distribution circuits throughout the airframe.

• Grounding: Provides a secure connection to grounding studs and airframe grounds.

Why Choose MS25036-149?

An aircraft's electrical system is its nervous system, and the integrity of every connection is critical. Using cheap, non-certified, commercial-grade terminals is an unacceptable risk. Such terminals often have vinyl insulation that can crack or melt, un-brazed seams that split during crimping, and no provision for strain relief. A failed crimp can lead to an open circuit (loss of function) or a high-resistance connection that generates heat and creates a fire hazard. An intermittent connection in an avionics system during IFR flight can be catastrophic. The MS25036-149 is a low-cost, engineered component that guarantees a reliable, safe, and airworthy electrical connection when installed correctly.

The engineering principle that defines the superiority of the MS25036-149 terminal is the creation of a metallurgically sound, cold-weld crimp. When installed with a calibrated mil-spec tool (e.g., M22520/1-01 with the correct die), the terminal barrel and the copper wire strands are subjected to immense, controlled pressure. This process of severe plastic deformation breaks down the surface oxides on the individual wire strands and the inner surface of the barrel. It forces the materials to flow together, creating intimate, metal-to-metal contact on a microscopic level. The result is a single, solid, homogenous mass with a very low electrical resistance. This "gas-tight" joint is impervious to oxygen and moisture intrusion, preventing the long-term degradation and corrosion that would plague a simple mechanical connection, ensuring a stable and reliable electrical path for the life of the aircraft.

Note: The MS25036-149 is a flight-critical electrical component. It must be installed using a properly calibrated, mil-spec crimping tool (per AS22520) with the correct die set for the terminal size. Using pliers, uncalibrated tools, or automotive-style crimpers will result in an un-airworthy connection and is strictly prohibited. The wire must be stripped to the correct length, and the wire strands must be clean and un-nicked.

Documentation

• MS25036: The military standard sheet defines all dimensional, material, and performance requirements for this series of terminals and is publicly available through various online mil-spec libraries.