MS25036-153 - Textron Aviation OEM Insulated Copper Closed Ring Tongue Terminal

MS25036-153 – Textron Aviation OEM Insulated Copper Closed Ring Tongue Terminal

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The MS25036-153 is a Textron Aviation OEM-certified, military-specification insulated ring tongue terminal designed for creating flight-critical electrical terminations in the most demanding aerospace environments. Manufactured in strict accordance with the SAE-AS25036 (formerly MS25036) standard, this component is engineered to terminate 22 to 18 AWG copper conductors, providing a secure and environmentally sealed connection point to a #8 stud. The terminal features a closed-barrel design with a red nylon insulation sleeve, which not only provides excellent dielectric strength but also serves as a visual identifier for its wire gauge range.

This is not an automotive-grade terminal; it is a precision-engineered component for airworthy electrical systems. Its tin-plated copper body ensures maximum conductivity and long-term corrosion resistance, while the integrated insulation sleeve provides both electrical protection and critical strain relief for the wire, preventing conductor fatigue failure in high-vibration airframe and powerplant applications. The MS25036-153 is the definitive standard for reliable wire termination, trusted by OEMs and A&P/IA mechanics for its consistent performance and adherence to rigorous aerospace quality controls.

Key Features

• Textron Aviation OEM Certified: Guarantees the part meets the highest quality and traceability standards required for installation on Cessna, Beechcraft, and other Textron airframes.

• SAE-AS25036 Compliant: Manufactured to the active military and aerospace standard for electrical terminals, ensuring interchangeability and performance.

• High-Conductivity Copper Body: Constructed from high-purity copper (per ASTM B152) for minimal electrical resistance and heat buildup.

• Corrosion-Resistant Tin Plating: Electrodeposited tin plating (per ASTM B545) provides a durable barrier against oxidation and galvanic corrosion.

• Color-Coded Nylon Insulation: Red nylon sleeve provides insulation up to 600V, offers wire strain relief, and clearly identifies the terminal for 22-18 AWG wire.

• Inspection Window: Features a small window to allow for visual inspection of proper wire insertion before and after crimping.

Technical Specifications

• Part Number: MS25036-153

• Alternate Part Number / Specification: SAE-AS25036-153

• Component Type: Insulated Ring Tongue Terminal

• OEM Manufacturer/Supplier: Textron Aviation

• Terminal Body Material: Copper, Annealed, per ASTM B152

• Plating: Tin per ASTM B545

• Insulation Material: Nylon, Type I, Class 2

• Insulation Color: Red

• Wire Size: 22-18 AWG

• Stud Size: #8

• Voltage Rating: 600 Volts Max.

• Temperature Rating: 105°C (221°F) Max.

• Governing Specification: SAE-AS25036 (Supersedes MS25036)

Aircraft Compatibility

The MS25036-153 is a standard electrical component utilized across virtually all modern and legacy aircraft makes and models. Its application is determined by the specific requirements of an electrical circuit as defined in the aircraft's wiring diagrams.

• Applicability: Specified for use in countless electrical systems on general aviation, commercial, business, and military aircraft manufactured by Textron Aviation (Cessna/Beechcraft), Piper, Cirrus, Boeing, Airbus, and others.

Applicable Textron Aircraft

• King Air 350 Fusion
• King Air 350C FM-36 & On
• King Air 350C Fusion
• King Air 350i
• King Air 360
• King Air 360C
• King Air B200, B200T, B200C or B200CT
• King Air B200GT
• King Air B200GT Fusion or B200CGT Fusion
• Super King Air 350
• Super King Air 350C FM-1 to FM-35

List not comprehensive, may be applicable on other models.

Note: The aircraft's official wiring diagram and maintenance manual are the sole authoritative documents for verifying the correct terminal for any specific application.

Applications

The MS25036-153 is designed for terminating copper conductors to terminal blocks, bus bars, relays, circuit breakers, and other electrical components with #8 studs.

• Primary Use: Avionics wiring harnesses, power distribution circuits, instrument panels, lighting systems, engine sensor leads, and general airframe electrical wiring.

Why Choose the OEM MS25036-153?

Electrical system integrity is paramount to flight safety. The OEM-certified MS25036-153 guarantees adherence to strict aerospace standards for materials, dimensional tolerances, and performance. Using non-certified, commercial-grade, or automotive terminals introduces unacceptable risks, including poor crimp quality, material fatigue, corrosion, and insulation breakdown, which can lead to intermittent faults or a complete electrical failure. Sourcing a fully traceable, MS-specification terminal from a trusted supplier is the only way to ensure a reliable, airworthy electrical connection that will withstand the rigors of flight.

The engineering principle that defines the superiority of the MS25036-153 terminal is the quality of the required circumferential crimp. Unlike inferior single-indent or F-crimps, a proper aerospace crimp performed with a calibrated tool (such as the M22520/2-01) and the correct die set reshapes the terminal barrel and copper wire strands into a near-homogenous, solid mass. This process, a form of cold welding, creates a gastight connection, eliminating voids that could allow moisture and oxygen to ingress and cause internal corrosion over time. The result is an electrical joint with minimal resistance and maximum mechanical strength, often exceeding the tensile strength of the wire itself. Furthermore, the terminal's insulation sleeve is designed with a flared bellmouth entry, which prevents the wire's insulation from being cut or chafed by the edge of the barrel during crimping and under vibration, providing essential strain relief that is critical for long-term reliability.

Note: The MS25036-153 terminal is a flight-critical component. It MUST be installed using a properly calibrated ratcheting crimping tool with the correct die set as specified in aviation maintenance standards (e.g., AC 43.13-1B). Using pliers or uncalibrated tools will result in an unairworthy connection that is prone to failure. Installation must be performed by a certified technician in accordance with the aircraft's maintenance manual.

Documentation

The governing standard SAE-AS25036 is a controlled document available for purchase from SAE International. Public-facing reference sheets and dimensional drawings based on the standard are widely available from major electrical component manufacturers and distributors.