A-A-55195 is a U.S. Government specification covering spun para-aramid sewing thread used in demanding military and industrial textile applications. This guide outlines the key requirements engineers and procurement teams typically review, including construction requirements, Tex-based strength characteristics, performance properties, and common applications for Kevlar® spun sewing thread.
A-A-55195 is a U.S. Government specification covering spun para-aramid sewing thread used in demanding military and industrial textile applications. The specification defines construction, performance, and quality requirements for Kevlar® spun thread used in protective gear, tactical equipment, and other high-strength sewing applications.
Rocket-Fibers supplies Kevlar® Spun Sewing Threads manufactured to meet the requirements of A-A-55195 for high-strength industrial sewing.
What The Specification Covers
A-A-55195 covers spun para-aramid sewing thread manufactured from staple Kevlar® fibers. These threads are designed for sewing high-strength textile assemblies where conventional nylon or polyester threads may fail under high loads or harsh environmental conditions.
The specification defines requirements for thread construction, physical properties, and quality standards to ensure consistent performance in demanding applications.
What Are Spun Sewing Threads?
Spun Kevlar® sewing threads are produced from staple para-aramid fibers rather than continuous filament yarns. Short fibers are spun into yarns, then twisted into plies and finished into the final sewing thread.
This spun construction improves sewability, abrasion resistance, and flexibility compared with filament yarns while maintaining the exceptional strength of Kevlar® Para-Aramid Fiber.
A-A-55195 Tex Table
The A-A-55195 specification defines physical properties for Kevlar® spun thread based on Tex size, ply construction, and minimum breaking strength.
| Tex Size | Ply | Minimum Breaking Strength (lbf) | Maximum Elongation (%) |
|---|---|---|---|
| 24–27 | 2 | 1.5 | 25 |
| 35–40 | 3 | 2.5 | 25 |
| 50–60 | 3 | 3.8 | 28 |
| 70–80 | 4 | 5.5 | 30 |
| 90–100 | 4 | 7.0 | 30 |
Note: Tex size is based on thread weight in grams per 1,000 meters.
Mechanical Properties Of Kevlar® Sewing Thread
Para-aramid fibers such as Kevlar® Para-Aramid Fiber provide exceptional tensile strength and high modulus due to their highly aligned molecular chains.
These characteristics allow Kevlar® sewing thread to maintain strength under high loads and resist abrasion during demanding sewing operations.
Compared with conventional sewing threads, Kevlar® thread offers:
- Extremely high tensile strength
- Excellent cut resistance
- Low elongation under load
- Excellent fatigue resistance
- Outstanding durability in harsh environments
Typical Applications For Kevlar® Sewing Thread
Kevlar® sewing thread is commonly used where extreme strength and durability are required.
- Ballistic armor systems
- Tactical gear and military equipment
- Cut-resistant protective textiles
- Heavy-duty industrial sewing
- Composite reinforcement assemblies
- Safety equipment and harness systems
These applications benefit from the inherent properties of Kevlar® Para-Aramid Fiber.
Workmanship And Thread Quality
A-A-55195 includes workmanship requirements to ensure thread consistency and sewing performance. Threads must be free from excessive knots, slubs, or other defects that could compromise sewing operations or finished product integrity.
Threads are typically supplied on cones, spools, or tubes depending on the sewing equipment and production requirements.
Kevlar® Thread Supply
Rocket-Fibers supplies Kevlar® Spun Sewing Threads for high-strength sewing applications and engineered textile assemblies.
