If you’ve been researching Tefzel wire looms for your race car, you’ve probably seen the term “Mil-Spec” thrown around. But what does it actually mean—and why should you care?
At Hard Wired Motorsports, we build looms that are Mil-Spec in construction, using M22759/16 Tefzel wire, professional motorsport-grade connectors, and best-practice techniques adopted from aerospace and defence industries.
Let’s break down what “Mil-Spec” really means in the world of motorsport wiring:
1. M22759/16 or M22759/32 Tefzel Wire
This wire is specified by the U.S. military for its extreme heat, abrasion, and chemical resistance. It’s lightweight, tough, and maintains conductivity under intense vibration—making it ideal for racing applications where regular wire just won’t cut it.
2. Crimped, Not Soldered
Mil-Spec harnesses use crimped terminals instead of soldering. Why? Because crimping (done correctly with professional tools) creates a more reliable mechanical and electrical bond —and it’s less prone to cracking under vibration.
3. Proper Labelling and Looming
Every wire is labelled, usually with laser-marked heat shrink or printed ID tags, so diagnostics and repairs are simple. Wires are bundled using concentric twisting or layered layups, keeping the loom neat, balanced, and easy to route.
4. Motorsport-Grade Connectors
Using Deutsch DT, DTM, or AS connectors is a core part of the Mil-Spec standard in motorsport. These connectors are sealed, robust, and proven under extreme conditions.
Why It Matters
If you want a harness that won’t let you down on race day, go Mil-Spec.
Hard Wired Motorsports specialises in Tefzel M22759/16 Mil-Spec looms that bring aerospace-grade durability to your race car.
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