TXL vs GXL vs SXL Wire Comparison
Specification: SAE J1128 | Material: XLPE (Cross-Linked Polyethylene)
All three of these wire designations share the same fundamental stranded bare copper core and the same Cross-Linked Polyethylene (XLPE) insulation material. They all share a temperature rating of -40°C to +125°C. The sole difference between them is the thickness of the insulation wall.
The Three Wall Thicknesses
TXL (Extra Thin Wall)
The standard for modern OEM automotive wiring. It offers the thinnest insulation, making it ideal for tight spaces and massive harnesses where weight and volume are critical constraints. It requires careful routing to avoid sharp edges.
GXL (Thin Wall)
The most common aftermarket choice. It provides a thicker insulation than TXL, offering better physical protection against abrasion while remaining relatively compact. Often used in engine bays, engine harnesses, and general chassis wiring.
SXL (Standard Wall)
The thickest insulation of the three. SXL is bulky and stiff, but provides exceptional resistance to abrasion and impact. It is typically reserved for exposed routing, heavy-duty commercial vehicles, or high-vibration industrial applications.
Dimensional Comparison (16 AWG)
| Type | Wall Thickness (Nominal) | Outside Diameter (Nominal) | Weight (lbs/1000ft) |
|---|---|---|---|
| TXL | 0.016" (0.40mm) | 0.092" (2.34mm) | 10.5 |
| GXL | 0.023" (0.58mm) | 0.106" (2.69mm) | 11.9 |
| SXL | 0.032" (0.81mm) | 0.124" (3.15mm) | 14.0 |
AWG to mm² Converter
Frequently Asked Questions
-
Can I mix TXL and GXL in the same harness?
Yes. The copper core is identical. However, verify that your connectors (like Weather Pack or Deutsch seals) can accommodate the specific outside diameter of the wire you choose. A seal designed for SXL will not seal properly on a TXL wire.
-
What is GPT wire?
General Purpose Thermoplastic (GPT) is a standard PVC insulated wire rated for 80°C. It is not recommended for automotive engine bays or under-chassis routing due to its low thermal threshold.