MS20995C32 – Textron Aviation OEM Stainless Steel Safety Wire (.032" Diameter)
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Overview
The MS20995C32 is a high-quality, military-specification stainless steel safety wire, supplied with the full certification and traceability of Textron Aviation as an Original Equipment Manufacturer (OEM) component. This is not merely wire; it is a critical safety device designed to provide a positive, physical lock for fasteners throughout an aircraft. The .032-inch diameter is the most common, general-purpose size used for securing bolts, nuts, screws, and other components against loosening from vibration and operational stresses.
Manufactured from fully annealed Corrosion Resistant Steel (CRES), this wire offers the ideal combination of ductility for proper installation and strength to perform its locking function. As a genuine Textron Aviation part, this MS20995C32 wire is the certified consumable for use on Cessna, Beechcraft, and Hawker aircraft, guaranteeing it meets the highest standards of material purity, dimensional accuracy, and performance required for airworthy assembly.
Key Features
Textron Aviation OEM Certified: Guarantees the product is fully traceable and meets the quality standards required by the airframe manufacturer for their fleet.
Positive Locking Device: When properly installed, it provides a physical barrier that prevents fasteners from backing out, representing one of the most reliable locking methods in aviation.
Corrosion Resistant Steel (CRES): Fabricated from Type 302/304 stainless steel, offering excellent resistance to rust and corrosion in typical airframe and powerplant environments.
0.032" General Purpose Diameter: The industry standard size for a vast range of applications, from engine accessories to flight control hardware.
Fully Annealed for Ductility: The wire is supplied in a soft, annealed condition, allowing it to be twisted and routed without breaking, yet retaining the tensile strength to remain secure.
MS20995 Specification Compliance: Manufactured in strict accordance with the military standard, ensuring material composition, diameter tolerance, and physical properties are correct.
Technical Specifications
Part Number: MS20995C32
Component Type: Lockwire / Safety Wire
OEM Authority: Textron Aviation
Governing Specification: MS20995
Material: Corrosion Resistant Steel (CRES), Type 302/304
Finish: Bright, Uncoated
Condition: Fully Annealed
Nominal Diameter: 0.032 inches
Standard Packaging: Typically supplied in a 1 lb (one-pound) disposable dispenser canister.
Aircraft Compatibility
MS20995C32 is a universal consumable item required for the maintenance of virtually every certified aircraft ever built. As a Textron Aviation OEM part, it is the specified choice for:
Cessna Citation Series Business Jets
Beechcraft King Air, Baron, and Bonanza
Cessna Caravan and Piston Aircraft
Hawker Business Jets
Note: This is a standard consumable. Applicability is determined by the maintenance procedure for a given fastener or component as detailed in the aircraft's maintenance manual.
Applications
Securing any drilled-head bolt, nut, screw, or turnbuckle against loosening.
Common in powerplant, flight control, landing gear, braking, and primary airframe systems.
Used on engine accessories, filter caps, drain plugs, and electrical connectors.
Why Choose this MS20995C32?
Safety wire is a flight-critical component. The reliability of countless bolted joints depends on its integrity. Using genuine, certified MS20995C32 wire from an OEM like Textron Aviation guarantees the correct alloy, diameter, and annealed state required for a safe and durable installation. The use of uncertified wire from a non-aviation source introduces a significant risk of failure due to improper material composition (leading to corrosion), incorrect temper (leading to fracture during installation), or inconsistent diameter.
The engineering principle of safety wiring is to create a positive lock that uses tensile force to its advantage. When MS20995C32 wire is installed using the standard double-twist method, it is routed through fasteners in such a way that the wire itself is placed under slight tension. If a fastener attempts to loosen (rotate counter-clockwise), this rotation pulls on the wire, increasing its tension. Since a wire is exceptionally strong in tension, this force resists the loosening torque. Furthermore, the wire is anchored to a second fastener or a fixed point, and the routing is configured so that the tension on the wire also applies a tightening force to the adjacent fastener. The material science of the austenitic Type 304 CRES is critical; its crystalline structure allows it to be bent and twisted significantly without work-hardening excessively, yet it retains high tensile strength, providing the perfect combination of ductility for installation and strength for its locking function.
Note: Safety wiring is a fundamental skill that must be performed by certified A&P mechanics in strict accordance with standard industry practices, such as those detailed in FAA Advisory Circular AC 43.13-1B, Chapter 7. New, clean wire must be used for every application. The wire must be tensioned properly, twisted with the correct number of twists per inch, and the cut pigtail must be bent back toward the part to prevent sharp edges and personal injury.
Documentation
The military standard governing this product is publicly available through the Department of Defense ASSIST database.
ASSIST Document Summary Page for MS20995: http://quicksearch.dla.mil/qsDocDetails.aspx?ident_number=36934