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Product

SAE J1127 Automotive & Heavy-Duty Starter / Ground Battery CablesSAE J112760 V DC (25 V AC)-40 to +125 °C

STX Thin-Wall Battery CableSAE J1127 Type STX 60 V DC starter thin-wall cross-linked polyethylene (XLPE) +125 °C batt

STX is an SAE J1127 Type STX thin-wall cross-linked battery cable engineered for 60 V DC automotive and commercial vehicle starting and power distribution systems where routing space and harness weight are constrained. Combining rope-lay annealed bare copper c

Oil & Acid Res.
SAE J1127 Flame
-40 to +125 °C
SAE J1127 STX
Order designation
STX 1 AWG (42.4 mm²)
Nom. OD
11.90 mm
Copper mass
226.2 kg/km
Total mass ≈
390.0 kg/km
Min. bend R
71.4 mm
All sizes (8)
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 AC
Max 60 V DC
Test voltage
1000 V AC (spark
Dielectric withstand
Operating temp
-40 to +125 °C
Short-circuit +250 °C
Min. bend radius
4 × D
Flexing 6 × D
Primary standard
SAE J1127
SAE J1127 Type STX; ISO 6722-1 Class C
Flame rating
SAE J1127 45° fl
Fire & safety compliance

Typical values for this cable type, based on SAE J1127 — confirmed in the datasheet and quotation for your order.

Application fit

Is STX right for your machine?

Used in modern passenger cars, light- and heavy-duty trucks, and 48 V mild-hybrid vehicles where reduced outer diameter and +125 °C thermal capability are required in tight engine compartments.

Motor stator, traction & converter leads

Suitable

Designed for compact 12 V / 24 V / 48 V starter motor, integrated starter-generator, and alternator leads

Switchgear & control cabinet wiring

Suitable

Smaller OD fits densely packed automotive wiring troughs, fuse boxes, and bulkhead grommets

Fixed installation

Suitable

Suitable for clipped under-hood and chassis harness routing

Trailing & towing

With conditions

Suitable for vehicle battery harnesses; for extra-flexible rubber leads choose SGR

Typical machinesTight Engine-Bay Starter & Alternator HarnessesAutomated OEM Battery Harness Assembly48 V Mild-Hybrid & Auxiliary Power Distribution

Construction

Layer by layer

Rope-lay bunch-stranded annealed bare copper (SAE J1127); Thin-wall cross-linked polyethylene (XLPE) thermoset insulation (SAE J1127 Type STX, +125 °C); Separator tape over rope-lay copper conductor strands where required for clean stripping; Integral single-layer thin-wall cross-linked XLPE battery insulation and jacket (Black or Red).

123
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1ConductorRope-lay bunch-stranded annealed bare copper conductor (SAE J1127)SAE J1127
2TapeThin separator wrap for clean automated lug strippingSAE J1127
3SheathThin-wall thermoset cross-linked polyethylene (XLPE) +125 °C insulation (Black / Red)SAE J1127

Tight Engine-Bay Starter & Alternator Harnesses

Reduced wall thickness lowers overall cable diameter by up to 1.5 mm compared with SGX, easing routing through congested engine bays.

Automated OEM Battery Harness Assembly

Consistent thin-wall XLPE profile supports high-speed automated cutting, stripping, and ultrasonic or hexagonal lug crimping.

48 V Mild-Hybrid & Auxiliary Power Distribution

Links 12 V / 48 V DC/DC converters, electric turbochargers, and high-power electric power steering racks.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on SAE J1127. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage (U0/U)
60 V DC (25 V AC)
Max. operating voltage
60 V DC
Dielectric test voltage
1000 V AC (spark/dielectric test per SAE J1127)
Insulation resistance
SAE J1127 thin-wall pinch, abrasion & dielectric compliance

Thermal

Operating temperature range
-40 °C to +125 °C
Dynamic / flexing temperature
-40 °C to +125 °C
Max. short-circuit temperature
+250 °C

Mechanical

Min. bend radius (fixed)
4 × D
Min. bend radius (flexing)
6 × D
Max. tensile pulling load
15 N/mm²
Vibration & mechanical duty
Engine vibration & compact harness routing

Resistance

Flame retardancy
SAE J1127 45° flame test (self-extinguishing)
Oil & fluid resistance
SAE J1127 hot oil, diesel fuel, power steering fluid & battery acid resistant
UV, weather & ozone
UV, weather, ozone & +125 °C under-hood thermal aging resistant
Chemical & environmental
Resistant to sulfuric battery acid, engine oil, gasoline, diesel, glycol coolant and brake fluid

Reference standards

Governing standard
SAE J1127 (2020) — Surface Vehicle Standard — Low Voltage Battery Cable (Type STX Thin-Wall)
Applicable clauses
SAE J1127 Type STX; ISO 6722-1 Class C
Secondary reference
ISO 6722-1 — Road vehicles — 60 V and 600 V single-core cables — Reduced-wall Class C

Identification

Core identification
Single-core battery conductor (Red for positive +, Black for negative/ground -)
Outer sheath colour
Black or Red
Surface print legend
TEBAOFLEX — STX — SAE J1127 — <AWG> — 60V DC — -40°C TO +125°C — THIN-WALL XLPE

Sizes

8 standard configurations (STX)

Nominal dimensions, copper weight, total mass and electrical parameters for STX per SAE J1127.

Dimensions & masses
DesignationSize / ConfigurationStranding · WallNom. OD
mm		Copper
kg/km		Total mass ≈
kg/km		Min. bend R
mm		Enquiry
STX size schedule
STX 6 AWG (13.3 mm²)6 AWG (13.3 mm²)133/27 · 1.4 mm7.3084.1145.043.8
STX 4 AWG (21.2 mm²)4 AWG (21.2 mm²)133/25 · 1.65 mm9.10123.0212.054.6
STX 2 AWG (33.6 mm²)2 AWG (33.6 mm²)259/26 · 1.65 mm10.80182.7315.064.8
STX 1 AWG (42.4 mm²)1 AWG (42.4 mm²)259/25 · 1.65 mm11.90226.2390.071.4
STX 1/0 AWG (53.5 mm²)1/0 AWG (53.5 mm²)259/24 · 1.65 mm13.20279.6482.079.2
STX 2/0 AWG (67.4 mm²)2/0 AWG (67.4 mm²)259/23 · 1.65 mm14.60345.1595.087.6
STX 3/0 AWG (85.0 mm²)3/0 AWG (85.0 mm²)259/22 · 1.9 mm16.80435.0750.0100.8
STX 4/0 AWG (107.2 mm²)4/0 AWG (107.2 mm²)413/23 · 1.9 mm18.60544.0938.0111.6
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Dimensions and tolerances conform to SAE J1127.

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
Dielectric voltage withstand & conductor DC resistance1000 V AC (spark/dielectric test per SAE J1127)100 % of production lengths
Sample tests
Insulation wall thickness, hot-set / pinch & cold bendConforms to SAE J1127 sample scheduleEvery production batch
Fluid immersion, flame propagation & thermal agingSAE J1127 45° flame test (self-extinguishing)Type qualification

Inspection certificate

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

Product approvals

SAE J1127 Type STX; ISO 6722-1 Class CISO 6722-1 (2011)RoHS 3 & REACH Compliant

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX — STX — SAE J1127 — <AWG> — 60V DC — -40°C TO +125°C — THIN-WALL XLPE
Delivery form
Non-returnable wooden drums, export reels or shrink-wrapped coils
Standard drum lengths
100 m · 250 m · 500 m · 1000 m
MOQ
200 m (stock sizes) · 500 m (custom lengths)
Lead time
2–3 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFSTX Thin-Wall Battery Cable – technical datasheet8 sizes · construction, technical data, approvalsXLSXSTX spec data (Excel)All 8 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.

Does the thinner wall on STX reduce its voltage or temperature rating compared to SGX?
No. Under SAE J1127, both Type STX and Type SGX share the exact same 60 V DC (25 V AC) voltage rating and -40 °C to +125 °C continuous operating temperature rating.
How much space does STX save over standard SGT or SGX?
Depending on AWG size, STX reduces nominal wall thickness from ~2.4–2.5 mm down to 1.4–1.9 mm, cutting overall outer diameter by 1.0–1.5 mm and reducing insulation weight in multi-cable harnesses.
Can STX use the same crimp lugs as SGX?
The copper conductor stranding and AWG cross-section are identical between STX and SGX, so the conductor barrel of the crimp lug is the same; only insulation-grip barrels or heat-shrink boots need to account for the smaller outer diameter.
What voltage and temperature ratings apply to STX under SAE J1127?
STX is rated for 60 V DC (25 V AC) (maximum operating voltage 60 V DC, dielectric test voltage 1000 V AC (spark/dielectric test per SAE J1127)) and continuous operation from -40 °C to +125 °C (short-circuit up to +250 °C) per SAE J1127.

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STX Thin-Wall Battery Cable

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