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Product

MIL-DTL-17 Fluoropolymer & RF Coaxial CablesMIL-DTL-17/12850 Ω · DC–12.4 GHzDouble SPC Shield +200 °C

RG-400 Double-Shielded Coaxial CableMIL-DTL-17/128 · 50 Ω ± 2 Ω · Ø 4.95 mm · 20 AWG (19×0.20) SPC · PTFE · Dual SPC braids

RG-400 (MIL-DTL-17/128-RG400) is the aerospace industry benchmark 50 Ω double-shielded fluoropolymer coaxial cable rated from -55 °C to +200 °C up to 12.4 GHz. Featuring a 19-strand 20 AWG silver-plated copper center, solid PTFE dielectric, dual

EMC screen
Low-EMC design
Flame-retardant
Oil-resistant
Order designation
RG-400/U (M17/128-RG400) Standard
Outer Ø ≈
4.95 mm
Metal weight
46.5 kg/km
Total weight ≈
74.4 kg/km
Min. bend R (fixed)
25 mm
All sizes (4)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Impedance Z₀
50 Ω ± 2 Ω
MIL-DTL-17/128 microwave coax
Outer diameter
4.95 mm (0.195")
Matches RG-58 / RG-223 group size
Shielding
Dual SPC braids
> 90 dB RF isolation · ≥ 96 % cov.
Temp. rating
-55 to +200 °C
PTFE core & FEP fluoropolymer jacket
Frequency range
DC to 12.4 GHz
VHF, UHF, L/S/C/X-band avionics
Max. voltage
1900 V rms
5.0 kV rms dielectric test

Typical values for this cable type, based on MIL-DTL-17/128-RG400 (M17/128) — confirmed in the datasheet and quotation for your order.

Application fit

Is RG-400 right for your machine?

Standard airframe RF cable for aircraft VHF/UHF comms, ADS-B Mode S transponders, TCAS, DME, GPS/GNSS antennas, radar waveguides, and +200 °C microwave test harnesses.

Switchgear & control cabinet wiring

Suitable

Primary coaxial interconnect for airframe avionics racks, transponder trays, and microwave test sets.

Fixed installation

Suitable

19-strand silver-plated copper conductor resists airframe vibration fatigue far better than solidRG-142.

Trailing & towing

Suitable

Supple 19×0.20 mm stranding and dual SPC braids ideal for laboratory VNA and spectrum analyzer leads.

Energy chain / drag chain

With conditions

Suitable for moderate gimbal flex; use dedicated drag-chain data cable for linear CNC tracks.

S 368 C
Typical machinesCommercial & Military Aircraft AvionicsADS-B, TCAS, DME & VHF/UHF AntennasRadar & Electronic Warfare SystemsSatellite Ground Station InterconnectsHigh-Temperature RF Test Benches

Construction

Layer by layer

20 AWG (19×0.20 mm) silver-plated copper center, Ø 2.95 mm virgin PTFE dielectric, two concentric silver-plated copper braids, and Ø 4.95

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Stranded SPC center conductor (20 AWG)19 × 0.20 mm (Ø 0.98 mm) silver-plated oxygen-free copper wire per ASTM B298MIL-DTL-17/128
2Solid virgin PTFE dielectricExtruded polytetrafluoroethylene (PTFE), Ø 2.95 mm ± 0.08 mmMIL-DTL-17/128
3Inner silver-plated copper braid36 AWG silver-plated copper wire braid (≥ 96 % optical coverage) in direct contact withMIL-DTL-17/128
4Outer silver-plated copper braidSecond counter-woven 36 AWG silver-plated copper braid providing > 90 dB shieldingMIL-DTL-17/128
5FEP fluoropolymer outer jacketExtruded fluorinated ethylene-propylene (FEP) Type IX jacket, translucent brown (Ø 4.95MIL-DTL-17/128

RG-400/U (M17/128-RG400)

Standard MIL-DTL-17/128 19-strand SPC center, dual SPC braids, translucent brown FEP jacket.

M17/175-00001 (Tight-Tolerance RG-400)

Sweep-tested low-VSWR military aerospace grade up to 12.4 GHz.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on MIL-DTL-17/128-RG400 (M17/128). Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance Z₀
50 Ω ± 2 Ω
Nominal capacitance
105.0 pF/m (32.0 pF/ft)
Velocity of propagation (VoP)
69.5 %
Shielding effectiveness
> 90 dB (dual SPC braids)
Max. operating voltage
1,900 V rms
Dielectric withstand test
5.0 kV rms at 60 Hz

Thermal

Operating temperature range
-55 °C to +200 °C continuous
Storage temperature range
-65 °C to +200 °C
Airframe fire resistance
FAR 25.853 / UL 910 low flame/smoke
Soldering thermal stability
Non-melting PTFE core (+327 °C melt)
Cold-bend rating
-55 °C without jacket cracking
Continuous CW power @ 400 MHz
580 W (@ +40 °C ambient)

Mechanical

Center conductor stranding
19 × 0.20 mm (20 AWG, Ø 0.98 mm)
Dielectric diameter
2.95 mm ± 0.08 mm (0.116 in)
Outer jacket diameter
4.95 mm ± 0.13 mm (0.195 in)
Min. bend radius (fixed / flex)
25 mm (5×D) / 50 mm (10×D)
Nominal cable weight
74.4 kg/km (50 lb/1000 ft)
Connector compatibility
TNC, BNC, Type N, SMA (RG-400/142 group)

Resistance

Aviation fluids & Skydrol
100 % resistant to Jet-A, JP-8 & Skydrol
Flame retardance
FAR 25.853, UL 910 & IEC 60332-1-2
Moisture & altitude stability
Zero moisture absorption in unpressurized
Vibration & flex fatigue
19-strand SPC resists work-hardening
Ozone & UV weathering
Inert FEP fluoropolymer outer sheath
RoHS / REACH status
RoHS 3 compliant

Reference standards

Military detail specification
MIL-DTL-17/128-RG400 (M17/128)
Sweep-tested QPL reference
MIL-DTL-17/175-00001
Conductor standard
ASTM B298 silver-coated soft copper
Airframe flammability standard
FAA FAR 25.853 / BSS 7230
Dielectric & jacket standards
ASTM D4894 (PTFE) & ASTM D2116 (FEP)
Quality certification
EN 10204 3.1 + 12.4 GHz sweep report

Identification

Dielectric colour
Natural white virgin PTFE
Outer jacket colour
Translucent amber-brown FEP
Surface legend
TEBAOFLEX M17/128-RG400 50 OHM 200C FEP
Standard reel lengths
100 m, 305 m (1000 ft), 500 m
Impedance group
50 Ω double-shielded 0.195" coax
Batch traceability
Lot number & TDR/VNA trace ID

Sizes

4 standard configurations (RG-400)

Dimensional, physical and high-frequency electrical parameters for RG-400 per MIL-DTL-17/128-RG400 (M17/128).

Dimensions & construction
Order designationConstruction / VariantConductorOuter Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard RG-400 variants
RG-400/U (M17/128-RG400) Standard50 Ω Dual SPC Braid (FEP Brown)20 AWG (19×0.20 SPC)4.9546.574.425
M17/175-00001 Swept 12.4 GHz RG-40050 Ω Swept Dual SPC Braid (FEP)20 AWG (19×0.20 SPC)4.9547.075.025
RG-400 PFA (+250 °C Jacket)50 Ω Dual SPC Braid (PFA Tan)20 AWG (19×0.20 SPC)4.9546.576.025
RG-400-LSZH Halogen-Free Shipboard50 Ω Dual SPC Braid (LSZH Black)20 AWG (19×0.20 SPC)5.0046.568.025
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Dimensions and weights are nominal production values subject to manufacturing tolerances per MIL-DTL-17/128-RG400 (M17/128).

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
Sweep VSWR & impedance to 12.4 GHz50 Ω ± 2 Ω; return loss ≥ 19 dB across avionics bandsEvery spool
5.0 kV AC dielectric withstand test5.0 kV rms at 60 Hz for 1 minute without breakdownEvery spool
Sample tests
Transfer impedance & shielding effectiveness> 90 dB isolation across 100 MHz to 12.4 GHzPer batch
FAR 25.853 burn test & -55/+200 °C thermal cycleComplies with MIL-DTL-17/128 and FAA airframe flammabilityQualification

Inspection certificate

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

Product approvals

MIL-DTL-17/128-RG400FAA FAR 25.853RoHS 3 / CE

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX MIL-DTL-17/128-RG400 50 OHM 200C
Delivery form
Spools, reels or export wooden drums
Standard reel lengths
100 m · 305 m (1000 ft) · 500 m · 1000 m
MOQ
100 m (stock) · 305–500 m (production)
Lead time
1–3 weeks ex-works
Incoterms
EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFRG-400 Double-Shielded Coaxial Cable – technical datasheet4 sizes · construction, technical data, approvalsXLSXRG-400 spec data (Excel)All 4 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.

Why do aircraft manufacturers specify RG-400 instead of RG-58 or RG-142?
Standard RG-58 uses flammable polyethylene/PVC rated only to +80 °C with a single shield, while RG-142 uses a stiff solid copper-clad steel center conductor prone to vibration fatigue; RG-400 combines a flexible 19-strand pure silver-plated copper center conductor with dual SPC braids and a +200 °C non-flammable FEP/PTFE dielectric system.
What is the maximum operating frequency of RG-400?
Under MIL-DTL-17/128 and M17/175, RG-400 is specified for continuous operation from DC up to 12.4 GHz, covering VHF comms, 978/1090 MHz ADS-B and TCAS, 1.5 GHz GNSS, 5 GHz C-band, and 10 GHz X-band airborne radar. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.
How does RG-400 compare with BCB009 low-loss avionics coax?
RG-400 uses a solid extruded PTFE dielectric (69.5 % VoP), making it ultra-rugged and crush-resistant, whereas BCB009 uses an expanded microporous PTFE tape dielectric (~82 % VoP) to achieve ~30 % lower attenuation on longer airframe runs up to 18 GHz. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.
Which RF connectors fit RG-400?
RG-400 has the same 2.95 mm dielectric diameter and 4.95 mm outer diameter as RG-142 and RG-223, so it accepts standard crimp/solder TNC, BNC, Type N, and SMA connectors designed for the RG-142/400 cable group. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.

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RG-400 Double-Shielded Coaxial Cable

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EN 4604-009

BCB009

50 Ω Low-Loss Expanded-PTFE Avionics Microwave Coax (DC–18 GHz)

View productMIL-DTL-17

RG-316

50 Ω +200 °C FEP/PTFE RF Coaxial Cable

View productMIL-DTL-17

RG-223/U

50 Ω Ø 5.38 mm Double-Shielded Silver-Plated Coax

View productMIL-DTL-17

RG-214

50 Ω Ø 10.80 mm Double-Shielded Silver-Plated Coax

View product
DatasheetRequest a quote