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Product

MIL-DTL-17 50 Ω & 75 Ω RF Coaxial CablesMIL-DTL-17 · M17/93-RG17850 Ω ± 2 Ω · Ø 1.80 mm Micro30 AWG SCCS · PTFE/FEP +200 °C

RG-178 Miniature Coaxial CableMIL-DTL-17 M17/93-RG178 (RG-178B/U) 50 Ω ± 2 Ω 7×0.10 mm SCCS + PTFE + FEP Ø 1.80 mm

RG-178 Miniature Coaxial Cable (MIL-DTL-17 M17/93-RG178 / RG-178B/U) is an ultra-thin Ø 1.80 mm (0.071 in) 50 Ω ± 2 Ω high-temperature (-55 °C to +200 °C) RF coaxial cable built with a 30 AWG (7×0.102 mm) stranded silver-plated copper-clad steel (SCCS)

Approved
Ozone, UV & moisture
Low-EMC design
EMC screen
Order designation
M17/169-00001 Swept 3 GHz RG-178 50 Ω
Outer Ø ≈
1.8 mm
Copper weight
4 kg/km
Total weight ≈
9 kg/km
Min. bend R (fixed)
9 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
DC to 3 GHz micro-coaxial
Outer diameter
1.80 mm ± 0.10
Fits MMCX, MCX, U.FL, SMB, SMA
Centre conductor
7 × 0.102 mm
30 AWG stranded SCCS (Ø 0.30 mm)
Temp. rating
-55 to +200 °C
Extruded PTFE + FEP Type IX
Velocity (VoP)
69.5 % (0.695 c)
96.5 pF/m · delay 4.79 ns/m
Min. bend radius
10 mm (5×D)
Tight internal RF module routing

Typical values for this cable type, based on MIL-DTL-17/93-RG178 (M17/93-RG178 / RG-178B/U) — confirmed in the datasheet and quotation for your order.

Application fit

Is RG-178 right for your machine?

Engineered for dense internal RF chassis wiring, cellular/GNSS/Wi-Fi M.2 and mini-PCIe pigtails (U.FL / IPEX / MMCX / MCX / SMA), avionics black-box harnesses, and medical ultrasound/RF probes.

Switchgear & control cabinet wiring

Suitable

Ultra-small 1.80 mm OD and 10 mm bend radius route inside 1U rack transceivers and handheld gateways.

Fixed installation

Suitable

PTFE dielectric withstands direct hand or reflow soldering of subminiature SMA, SMB, MCX, and MMCX plugs.

Immersion & wet locations

Suitable

FEP fluoropolymer jacket resists cleaning solvents, flux, fuels, hydraulic oils, and moisture.

Energy chain / drag chain

With conditions

7-strand SCCS resists vibration and chassis flexing; not intended for long-stroke industrial energy chains.

RG-58
Typical machinesRF transceiver & SDR internal jumpersIIoT cellular, GNSS & Wi-Fi pigtailsAvionics, UAV & defense electronicsMedical diagnostic & test instrumentation

Construction

Layer by layer

Centre conductor: 7×0.102 mm (30 AWG, Ø 0.30 mm, 0.057 mm²) stranded silver-plated copper-clad steel (SCCS) per ASTM B501. Dielectric: Ø

1234
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
17-strand SCCS centre conductor (30 AWG)7 × 0.102 mm (Ø 0.30 mm, 30 AWG) stranded silver-plated copper-clad steel (SCCS)MIL-DTL-17 M17/93-RG178
2Miniature extruded PTFE dielectricVirgin solid polytetrafluoroethylene (PTFE) extruded to Ø 0.84 mm ± 0.05 mmMIL-DTL-17 Type F-1
338 AWG silver-plated copper braidFine 38 AWG silver-plated copper wire braid, optical coverage ≥ 95 % (Ø 1.30 mm)MIL-DTL-17
4FEP fluoropolymer jacket (Ø 1.80 mm)Fluorinated ethylene propylene (FEP Type IX) outer sheath in translucent brown (-55 toMIL-DTL-17 Type IX

RG-178B/U (M17/93-RG178) 50 Ω Standard

7×0.102 mm SCCS + Ø 0.84 mm PTFE + silvered Cu braid + Ø 1.80 mm FEP jacket (-55 to +200 °C).

M17/169-00001 (Swept RG-178) & RG-316 (Ø 2.50 mm) Option

Swept MIL-DTL-17/169 version or lower-attenuation 26 AWG RG-316 (Ø 2.50 mm, 50 Ω) step-up.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on MIL-DTL-17/93-RG178 (M17/93-RG178 / RG-178B/U). Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance Z0
50 Ω ± 2 Ω
Mutual capacitance
96.5 pF/m (29.4 pF/ft)
Velocity of propagation (VoP)
69.5 % (0.695 c) · time delay 4.79 ns/m
Attenuation (100 / 400 / 1000
45.9 / 91.9 / 151.0 / 275.0 dB/100m
Max. DC conductor resistance @ 20 °C
≤ 800 Ω/km (30 AWG SCCS) · Braid ≤ 46 Ω/km
Operating / dielectric test voltage
750 V RMS working (1,000 V max) · 2,000 V

Thermal

Operating temperature range
-55 °C to +200 °C continuous
CW power rating (100 / 400 / 1000
240 W / 110 W / 58 W CW @ 40 °C

Mechanical

Nominal dimensions (Core / PTFE
0.30 mm / 0.84 mm / 1.80 mm ± 0.10 mm
Min. bending radius
5 × D (9.0 mm) static · 10 × D (18 mm)

Resistance

Solder iron & reflow resistance
PTFE/FEP resists +260 °C soldering without
Flame & chemical resistance
UL 910 / VW-1 · impervious to solvents

Reference standards

Primary specification
MIL-DTL-17 / M17/93-RG178 (RG-178B/U) &
Connector compatibility
U.FL / IPEX MHF, MMCX, MCX, SMB, SMC, SMA

Identification

Dielectric colour
White virgin PTFE
Outer jacket colour
Translucent Brown FEP (White or Clear FEP

Sizes

4 standard configurations (RG-178)

Nominal dimensions, copper weights, impedance and transmission parameters for RG-178 per MIL-DTL-17/93-RG178 (M17/93-RG178 / RG-178B/U).

Dimensions & weights
Order designationConfigurationConductor sizeOuter Ø ≈
mm		Copper
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard RG-178 configurations
M17/93-RG178 (RG-178B/U) 30 AWG SCCS 50 Ω7×0.102 mm SCCS + PTFE + AgCu30 AWG (0.057 mm²)1.8499
M17/169-00001 Swept 3 GHz RG-178 50 Ω7×0.102 mm SCCS (Swept 3 GHz)30 AWG (0.057 mm²)1.8499
RG-178 Double-Silver-Braided (RG-178 DS) 50 Ω7×0.102 mm SCCS + 2×AgCu Braid30 AWG (0.057 mm²)2.271411
M17/113-RG316 (RG-316/U) 26 AWG Step-Up 50 Ω7×0.17 mm SCCS + PTFE (RG-316)26 AWG (0.15 mm²)2.581812
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Outer diameters and weights are nominal factory values subject to ±5 % manufacturing tolerance per MIL-DTL-17/93-RG178 (M17/93-RG178 / RG-178B/U).

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
TDR characteristic impedance & VNA return loss (DC–3 GHz)Z0 = 50 ± 2 Ω; VSWR ≤ 1.30:1 up to 3 GHz100 % of reels
2.0 kV RMS dielectric & 750 V RMS corona extinctionMIL-DTL-17/93 high-voltage & partial-discharge pass100 % of reels
Sample tests
30 AWG SCCS break strength & solderabilityHigh tensile copper-clad steel core prevents pin pull-outPer production batch
-55 °C cold bend & +200 °C thermal agingMIL-DTL-17 fluoropolymer qualificationType approval

Inspection certificate

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

Product approvals

MIL-DTL-17 / M17/93-RG178UL VW-1 / FAR 25.853RoHS / REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX MIL-DTL-17 M17/93-RG178 RG-178B/U
Delivery form
Non-returnable plywood reels or export drums
Standard reel lengths
100 m · 305 m · 500 m · 1000 m
MOQ
100 m (stock variants) · 500 m (custom)
Lead time
2–3 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFRG-178 Miniature Coaxial Cable – technical datasheet4 sizes · construction, technical data, approvalsXLSXRG-178 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 does RG-178 use a silver-plated copper-clad steel (SCCS) centre conductor instead of pure copper?
At a tiny 30 AWG (Ø 0.30 mm, 7×0.102 mm) diameter, pure annealed copper has very low breaking strength and snaps easily when crimping or routing miniature MMCX/U.FL connectors. Copper-clad steel provides steel core tensile strength while the outer silver plating carries 100 % of the RF skin-effect current.
How does RG-178 (50 Ω) differ from RG-179 (75 Ω)?
Both use the exact same 30 AWG (7×0.102 mm) SCCS centre conductor, silver-plated copper braid, and +200 °C PTFE/FEP fluoropolymer materials. However, RG-178 uses a Ø 0.84 mm PTFE dielectric (Ø 1.80 mm jacket) to achieve 50 Ω ± 2 Ω, whereas RG-179 expands the PTFE dielectric to Ø 1.60 mm (Ø 2.54 mm jacket) to achieve 75 Ω ± 3 Ω.
What is the practical length limit for RG-178 pigtails at 2.4 GHz or 5.8 GHz?
Because of its miniature 1.80 mm diameter, RG-178 has an insertion loss of 1.51 dB/m at 1 GHz and ~2.4 dB/m at 2.4 GHz. It is engineered specifically for short 50 mm to 500 mm internal board-to-bulkhead pigtails (keep losses under 0.5–1.2 dB), after which an external RG-58 or RG-142 cable takes over.
Can RG-178 be hand-soldered directly to PCB pads or SMA centre contacts without melting the insulation?
Yes. Unlike polyethylene micro-coax whose dielectric melts at +105 °C and shorts the centre pin to the shield during soldering, RG-178 uses virgin extruded PTFE rated beyond +260 °C soldering temperatures. Each production reel undergoes 100 % characteristic impedance verification, mutual capacitance and DC loop resistance testing, and dielectric spark/withstand inspection before dispatch with an EN 10204 3.1 certificate.

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RG-178 Miniature Coaxial Cable

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