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Product

SAE J1128 North American Automotive Primary Wires60 V DC / 25 V ACSAE J1128 Type GPT-40 to +85 °C (Class A)

GPT Automotive Primary Wire60 V DC / 25 V AC SAE J1128 regular-wall thermoplastic PVC automotive primary wire (20–8 A

Type GPT (General Purpose Thermoplastic) is a standard-wall 60 V DC (25 V AC) low-voltage primary wire manufactured to SAE J1128 for North American automotive, agricultural, marine-cabin and trailer harnesses. Built with concentric stranded ASTM B3 bare copper

SAE J1128 Oil & Fuel
SAE J1128 Self-Extinguishing
SAE J1128 / Ford / Chrysler
Order designation
GPT 14 AWG (2.0 mm²)
Max. OD
3.45 mm
Copper mass
17.8 kg/km
Total mass ≈
24.5 kg/km
Min. bend R
17.2 mm
All sizes (12)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Rated voltage
60 V DC / 25 V A
SAE J1128 surface vehicleLV
Thermal class
-40 to +85 °C
ISO Class A (+105 °C option)
Gauge range
20 to 8 AWG
0.5 to 8.0 mm² metric equivalent
Wall profile
Regular wall
0.58 mm nominal wall (20–14 AWG)
Conductor
Stranded Cu
ASTM B3 annealed concentric copper
Min. bend radius
5 × wire OD
Fixed harness loom routing

Typical values for this cable type, based on SAE J1128 / ISO 6722-1 Class A — confirmed in the datasheet and quotation for your order.

Application fit

Is GPT right for your machine?

Used in general cabin wiring, dashboard harnesses, body lighting looms, agricultural tractors, RV campers and aftermarket trailer harnesses where temperatures do not exceed +85 °C.

Fixed installation

Suitable

Routes through split-loom convoluted tubing, body channels and cabin floor harnesses.

Switchgear & control cabinet wiring

Suitable

Compatible with standard open-barrel and insulated crimp terminals on fuse blocks and relays.

Trailing & towing

Not suitable

Single-core primary wire must be enclosed inside a harness loom or jacketed cable.

Multicore Trailer Cable

Furnace, kiln & high-temp zone

Not suitable

Thermoplastic PVC softens above +85/+105 °C; use cross-linked TXL/GXL/SXL in hot engine bays.

GXL +125 °C XLPE wire
Typical machinesPassenger car & truck cabinsAgricultural & off-highway machineryRV, caravan & boat interiorsAftermarket lighting & accessoriesUtility trailer wiring looms

Construction

Layer by layer

ASTM B3 stranded annealed bare copper conductor + regular-wall plasticized thermoplastic PVC dielectric (0.58–1.09 mm) + smooth colour-coded/striped surface skin.

123
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Stranded bare copper conductorConcentric stranded annealed uncoated copper per ASTM B3 / SAE J1128 (7, 19 or 133 strands)ASTM B3
2Regular-wall thermoplastic PVCGeneral-purpose plasticized polyvinyl chloride (PVC) insulation rated -40 °C to +85 °C (0.58 mm wall on 20–14 AWG)SAE J1128
3Integral colour-coded outer skinSmooth low-friction extruded PVC surface layer with optional spiral/longitudinal polarity stripeSAE J1128

SAE J1128 GPT (85 °C Standard)

Standard SAE J1128 Class A (-40 °C to +85 °C) thermoplastic PVC primary wire for body and interior harnesses.

GPT 105 °C Dual-Rated

Upgraded +105 °C heat-stabilised PVC formulation for warm instrument panels and fuse-box distribution.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on SAE J1128 / ISO 6722-1 Class A. Values for your order are confirmed in the datasheet and quotation.

Electrical

Nominal operating voltage
≤60 V DC / ≤25 V AC
Dielectric withstand test
1.0 kV AC rms for 1 minute (wet dielectric test)
Spark test voltage (in-line)
1.5 kV to 3.0 kV AC rms

Thermal

Continuous operating temperature
-40 °C to +85 °C (3000 h thermal class)
Cold bend test temperature
-40 °C for 4 hours on mandrel without cracking

Mechanical

Nom. wall thickness (20–14 AWG)
0.58 mm (0.023 in)
Nom. wall thickness (12–10 / 8 AWG)
0.66 mm (12 AWG) · 0.79 mm (10 AWG) · 0.94 mm (8 AWG)
Min. installation bend radius
5 × overall wire diameter

Resistance

Flame propagation
45° inclined burn test: self-extinguishes within 70 s
Fluid immersion resistance
Engine oil, gasoline, diesel, ethanol, antifreeze & battery acid per SAE J1128

Reference standards

Primary specification
SAE J1128 Type GPT
OEM specifications
Ford ESB-M1L56-A & Chrysler MS-3450

Identification

Colour coding
12 base colours with longitudinal or spiral tracer stripes
Surface finish
Unprinted smooth surface for automated cut-strip-crimp machines

Sizes

12 standard sizes (GPT)

Nominal dimensions, wall thickness, copper mass and electrical parameters for GPT per SAE J1128 / ISO 6722-1 Class A.

Dimensions & masses
DesignationAWG (Metric mm²)Strands / Wall mmMax. OD
mm		Copper
kg/km		Total mass ≈
kg/km		Min. bend R
mm		Enquiry
GPT size range
GPT 20 AWG (0.5 mm²)20 AWG (0.5 mm²)7/28 · 0.58 mm2.504.99.212.5
GPT 18 AWG (0.8 mm²)18 AWG (0.8 mm²)16/30 · 0.58 mm2.757.612.513.8
GPT 16 AWG (1.0 mm²)16 AWG (1.0 mm²)19/29 · 0.58 mm3.0511.216.815.2
GPT 14 AWG (2.0 mm²)14 AWG (2.0 mm²)19/27 · 0.58 mm3.4517.824.517.2
GPT 12 AWG (3.0 mm²)12 AWG (3.0 mm²)19/25 · 0.66 mm4.2028.237.521.0
GPT 10 AWG (5.0 mm²)10 AWG (5.0 mm²)19/23 · 0.79 mm5.1045.058.525.5
GPT 8 AWG (8.0 mm²)8 AWG (8.0 mm²)19/21 · 0.94 mm6.2071.591.031.0
GPT 18 AWG 19-Strand18 AWG (19/30)19/30 · 0.58 mm2.808.913.814.0
GPT 16 AWG 26-Strand16 AWG (26/30)26/30 · 0.58 mm3.1012.117.815.5
GPT 14 AWG 41-Strand14 AWG (41/30)41/30 · 0.58 mm3.5019.126.017.5
GPT 12 AWG 65-Strand12 AWG (65/30)65/30 · 0.66 mm4.2530.239.821.2
GPT 10 AWG 105-Strand10 AWG (105/30)105/30 · 0.79 mm5.1548.562.025.8
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Dimensions and maximum overall diameters conform to SAE J1128 / ISO 6722-1 Class A.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
In-line AC spark test & conductor DC resistance100 % spark-tested at 1.5–3.0 kV; DC resistance per SAE J1128 Table 1100 % of spools
Sample tests
-40 °C cold bend & 1.0 kV wet dielectric testNo insulation cracks after 4 h at -40 °C followed by 1 kV saltwater immersionEvery lot
SAE J1128 3000-hour thermal ageing & fluid immersionRetains dielectric strength after 3000 h at +85 °C and hot oil/fuel immersionType qualification

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

SAE J1128 Type GPTISO 6722-1 Class A (85 °C)Ford ESB-M1L56-AChrysler MS-3450RoHS 3 Compliant

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX SAE J1128 GPT 16 AWG (1.0mm2) 60VDC -40C TO +85C [lot/spool]
Delivery form
Non-returnable plastic spools, barrel packs or wooden drums
Standard spool lengths
500 m · 1000 m · 2000 m spools (or barrel packs)
MOQ
500 m (stock colours) · 2000 m (striped/custom)
Lead time
2–3 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFGPT Automotive Primary Wire – technical datasheet12 sizes · construction, technical data, approvalsXLSXGPT spec data (Excel)All 12 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

What is the difference between SAE J1128 GPT and GXL automotive primary wire?
GPT uses a thermoplastic polyvinyl chloride (PVC) insulation rated from -40 °C to +85 °C for general interior, body and trailer wiring. GXL uses electron-beam or chemically cross-linked polyethylene (XLPE) with the same 0.58 mm wall thickness (on 20–14 AWG), raising the temperature rating to +125 °C and preventing melt-through under short-circuit overload.
How does GPT wall thickness compare with TWP thin-wall PVC wire?
On 20 to 14 AWG sizes, GPT features a regular 0.58 mm (0.023 in) nominal insulation wall, whereas TWP uses a reduced 0.40 mm (0.016 in) thin wall to save harness bundle diameter and weight in high-density dashboard looms.
Why are SAE J1128 metric cross-sections slightly different from European ISO 6722 sizes?
North American SAE J1128 wires are built around American Wire Gauge (AWG) strand constructions—so 20 AWG corresponds to 0.5 mm², 18 AWG to 0.8 mm², 16 AWG to 1.0 mm², 14 AWG to 2.0 mm², 12 AWG to 3.0 mm² and 10 AWG to 5.0 mm².
Can GPT primary wire be terminated on high-speed automated Komax or Schleuniger crimp presses?
Yes. The concentric stranded copper core and smooth, concentric PVC wall strip cleanly with zero strand nicking and fit standard North American open-barrel Delphi/Aptiv, TE and Molex insulation crimp wings.

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GPT Automotive Primary Wire

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