FIELD GUIDESource-led reference
Port & Cable

P205 / Coax / Connector

HD-BNC coaxial connector

HD-BNC is a compact bayonet-style coaxial connector family with impedance-specific product variants.

Also called HD-BNC high density BNC HD BNC

A miniature bayonet coax outline does not establish 50-ohm versus 75-ohm system compatibility or signal format.

Look for

Identify the exact HD-BNC product/impedance and the equipment signal specification before selecting a cable assembly.

Claim inspection dates: 2026-10-05, 2026-10-07, 2026-10-12 · Independent review pending

HD-BNC coaxial connector: three-quarter view. Computer-generated illustration, not a photograph.

Three-quarter view Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

HD-BNC coaxial connector: mating face. Computer-generated illustration, not a photograph.

Mating face Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

HD-BNC coaxial connector: fitted in place. Computer-generated illustration, not a photograph.

Fitted in place Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

HD-BNC coaxial connector: original recognition drawing, not to scale.

Recognition drawing Original schematic, not to scale. Drawing review pending.

Image inspection / P205

See the view. Check its scope.

2 registered views for this reference. Different part examples are not automatically mates; all remain not to scale and independently unapproved.

HD-BNC / a named board-and-panel example. Named catalogue-row identity. Small source photo supports only a broad exterior, not precision mating or termination details. (private workspace)

P205 / Source-observed physical study

HD-BNC / a named board-and-panel example

Amphenol RF 034-1018 — catalogue row

Simplified side exterior from the small row photograph · Board header

Not to scale. Technical and rights review pending.

Inspect view & provenance (private workspace)
Similar roles / separately specified impedance. Concept comparing documented catalogue rows without treating a similar role or blank cell as proof of equivalence. (private workspace)

P205 / Concept — not physical geometry

Similar roles / separately specified impedance

034-1018, 034-5013 and 034-1021 comparison concept

Information diagram · Concept only

Not to scale. Technical and rights review pending.

Inspect view & provenance (private workspace)

Flagship reference

Practical answers for HD-BNC coaxial connector

Start with the answer. Follow the real distinction, then the source-scoped next check. All evidence dates and publication blockers remain unchanged.

V102Q10 Practical reference

Can an HD-BNC plug directly replace a BNC plug in a video rack?

Short answer Not by name or signal purpose alone. Amphenol describes HD-BNC as a distinct compact bayonet family, and lists a specific 75-ohm HD-BNC-jack/BNC-jack between-series adapter. Impedance and exact product direction still matter.

Which distinction matters?

What you are checkingWhat the cited evidence establishes
HD-BNC familyCompact bayonet interface with separate 50- and 75-ohm variants
BNC familyDistinct interface and its own 50-/75-ohm variants
Documented adapterAmphenol APH-BNCJ-HDBNCJ: a specific 75-ohm jack-to-jack conversion example

Next checks, in order

  1. Identify each actual port family and its 50- or 75-ohm variant.
  2. If conversion is needed, confirm the exact between-series part and both mating roles.
  3. Check cable/system impedance, signal requirements and the named product’s documented scope separately.

Still unresolved: A 12G product example is not a family-wide performance claim; no universal direct mating or electrical success is established.

BNC connector reference Coax impedance notes
Claim-level evidence, source locators and limits

Existing evidence claims: C205A · C205B · C205C · C205D · C027A · C027D. These are editorial field answers over inherited source records, not newly approved specifications.

  • S208 · Amphenol RF — HD-BNC product-family overview. Recorded inspection 2026-10-05; Identification/reference scope only. V36 does not convert this source into a universal pinout, fabrication drawing, electrical approval or end-to-end compatibility verdict.
  • S423 · Amphenol RF — Printed pages 3–4, 9 and 11: bayonet and impedance options, interface drawings, between-series adapters and named 12G subset.. Recorded inspection 2026-10-07; No explicit revision date was observed. Full IEC 61169-70 was not inspected; its mention is a locator, not a reproduced standard. No family-wide maximum, interface dimensions or fabrication tolerances are adopted.
  • S029 · Amphenol RF — BNC product family. Recorded inspection 2026-10-01;
  • S425 · Amphenol RF — Full FAQ answer: physical mating is distinct from impedance matching and signal reflections.. Recorded inspection 2026-10-07; Does not assert that every 50/75-ohm connector pair physically mates, quantify a universal loss, or establish the rating of an unidentified connector.

Neither the source inspection dates nor the evidence dataset has been refreshed. No physical tests, exact-device compatibility approval, pinout or fabrication geometry is implied.

Inspect the illustrationExterior side view · larger view & look-alikes
HD-BNC coaxial connector — exterior side view; plug-style exterior; original, not-to-scale identification schematic; drawing review pending
View Exterior side viewDepiction Plug-style exteriorNot to scale · independent drawing review pending

Read the view

HD-BNC exterior with a simplified coupling body

Cable side is at the left. This is an exterior view, not a contact layout or interface gauge.

What it cannot establish: Use the exact part designation; impedance and 12G scope cannot be read from the sketch.

Enlargement changes display size only. It does not reveal measured geometry, a pin assignment or an approved mating combination.

Compare a likely look-alike

BNC connector →Mini-BNC coaxial connector →

Read the underlying references: S208 · S423. Artwork interpretation remains review-pending.

How to read connector illustrations →

The useful distinction

Recognize it. Then verify it.

HD-BNC is a compact bayonet-style coaxial connector family with impedance-specific product variants. [C205A]

Amphenol’s HD-BNC guide describes a bayonet interface with separate 50-ohm and 75-ohm offerings. [C205B]

The guide lists APH-BNCJ-HDBNCJ as a straight 75-ohm between-series adapter with an HD-BNC jack on one side and a BNC jack on the other. [C205C]

Amphenol identifies a 12G HD-BNC product line for 12G-SDI use and lists named 12G parts; its performance discussion refers to a mated pair from that line. [C205D]

The HD-BNC guide places 034-1018 among its 75-ohm PCB jacks and describes a straight end-launch, rear-bulkhead-mount configuration. [C205E]

The HD-BNC guide places 034-5013 among its 50-ohm PCB jacks and describes a straight end-launch, rear-bulkhead-mount configuration. [C205F]

The guide places HD-BNC 034-1021 among 75-ohm PCB jacks with straight, through-hole termination; the row has no text in its Features cell. [C205G]

Source-scoped identification facts

Each value retains its exact example, role and measurement axis. Facts from different parts must not be combined into an invented component.

Documented examples; not a mating drawing or compatibility approval
Mountingthrough-hole (Claim C205G)S540Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Printed p.5, exact row. A blank cell is unknown information, not an explicit no-mount statement.
Coupling / latchQuarter-turn bayonetS208Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: Amphenol RF HD-BNC product family. Family coupling is useful identification context but is not automatically counted as a polarization/keying fact.; No part suffix, row/contact pitch, dimensional axis, physical marking or universal performance limit inferred.
ManufacturerAmphenol RFS208Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: Amphenol RF HD-BNC product family. Family coupling is useful identification context but is not automatically counted as a polarization/keying fact.; No part suffix, row/contact pitch, dimensional axis, physical marking or universal performance limit inferred.
SeriesHD-BNCS208Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: Amphenol RF HD-BNC product family. Family coupling is useful identification context but is not automatically counted as a polarization/keying fact.; No part suffix, row/contact pitch, dimensional axis, physical marking or universal performance limit inferred.

Not recorded: Nominal contacts, Positions / cavity span, Populated contacts, Contact rows, Contact pitch, Dimensions / axis, Connector role, Contact gender / arrangement, Keying / polarization, Shell / form, Exact part / implementation, Recorded markings, View convention. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits
  • Full IEC 61169-70 and fabrication dimensions were not reviewed.
  • Exact part impedance, cable construction, frequency requirements and link performance need separate evidence.
Report a correction to these facts →

Bounded facts, visible unknowns

Specifications and limits

HD-BNC coaxial connector facts and limitations
Documented identificationCompact HD-BNC coaxial connector family; impedance varies by product. [C205A]
HD-BNC variant evidenceAmphenol’s HD-BNC guide describes a bayonet interface with separate 50-ohm and 75-ohm offerings. [C205B]
HD-BNC variant evidenceThe guide lists APH-BNCJ-HDBNCJ as a straight 75-ohm between-series adapter with an HD-BNC jack on one side and a BNC jack on the other. [C205C]
HD-BNC variant evidenceAmphenol identifies a 12G HD-BNC product line for 12G-SDI use and lists named 12G parts; its performance discussion refers to a mated pair from that line. [C205D]
Mechanical dimensionsNo independently reviewed mechanical drawing in V36; do not use this page for fabrication, fit testing or tolerance work.
Engineering pinoutSource-checked engineering profile available; independent review pending. Open engineering profile →
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

Use the source-backed form or position count only for identification. Resolve ratings, protocol, direction, wiring, cable construction and exact device support from the relevant equipment and component documentation.

Before you connect

What to check

  1. Identify the exact connector family and variant from the equipment or cable documentation.
  2. Keep shape, contact count, protocol, electrical rating and device support as separate facts.
  3. Do not force, rewire or adapt a connector from this recognition record; resolve the remaining requirements first.
Trace a supported connection class →

What is not established

This field note does not approve a connection, adapter, cable assembly, rewiring scheme or fabricated part. It intentionally omits unsupported pin assignments and mechanical tolerances.

Your next step

Move from the form to the requirement.

Read the engineering reference Source-scoped details, orientation and explicit unknowns.Work through a connection Choose your task before deciding on a cable.Explore this evidence trail Inspect the claims and their dependencies. (private workspace)

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

Back to first citation ↑
C205ASource checked · pending review

Amphenol RF identifies HD-BNC as a compact bayonet-style coaxial connector family offered in 50-ohm and 75-ohm variants.

Amphenol RF · HD-BNC connectors ↗

Locator: HD-BNC product-family overview
Access: public page. Identification/reference scope only. V36 does not convert this source into a universal pinout, fabrication drawing, electrical approval or end-to-end compatibility verdict.

S208: full source recordInspect review dependencies → (private workspace)

Claim scope: V36 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction or end-to-end compatibility proof.. Next review due 2027-01-03.

Back to first citation ↑
C205BSource checked · pending review

Amphenol’s HD-BNC guide describes a bayonet interface with separate 50-ohm and 75-ohm offerings.

Amphenol RF · Amphenol RF HD-BNC Product Series Solutions Guide ↗

Locator: Printed pages 3–4, 9 and 11: bayonet and impedance options, interface drawings, between-series adapters and named 12G subset.
Access: public pdf text. No explicit revision date was observed. Full IEC 61169-70 was not inspected; its mention is a locator, not a reproduced standard. No family-wide maximum, interface dimensions or fabrication tolerances are adopted.

S423: full source recordInspect review dependencies → (private workspace)

Claim scope: Printed pages 3–4; no full standard review, interface dimensions or universal operating-frequency maximum.. Next review due 2027-01-05.

Back to first citation ↑
C205CSource checked · pending review

The guide lists APH-BNCJ-HDBNCJ as a straight 75-ohm between-series adapter with an HD-BNC jack on one side and a BNC jack on the other.

Amphenol RF · Amphenol RF HD-BNC Product Series Solutions Guide ↗

Locator: Printed pages 3–4, 9 and 11: bayonet and impedance options, interface drawings, between-series adapters and named 12G subset.
Access: public pdf text. No explicit revision date was observed. Full IEC 61169-70 was not inspected; its mention is a locator, not a reproduced standard. No family-wide maximum, interface dimensions or fabrication tolerances are adopted.

S423: full source recordInspect review dependencies → (private workspace)

Claim scope: Printed page 9 ordering row only; existence of an adapter does not make the bare interfaces the same.. Next review due 2027-01-05.

Back to first citation ↑
C205DSource checked · pending review

Amphenol identifies a 12G HD-BNC product line for 12G-SDI use and lists named 12G parts; its performance discussion refers to a mated pair from that line.

Amphenol RF · Amphenol RF HD-BNC Product Series Solutions Guide ↗

Locator: Printed pages 3–4, 9 and 11: bayonet and impedance options, interface drawings, between-series adapters and named 12G subset.
Access: public pdf text. No explicit revision date was observed. Full IEC 61169-70 was not inspected; its mention is a locator, not a reproduced standard. No family-wide maximum, interface dimensions or fabrication tolerances are adopted.

S423: full source recordInspect review dependencies → (private workspace)

Claim scope: Printed page 11; no transfer of the named subset’s statement to every HD-BNC product or to a complete cable path.. Next review due 2027-01-05.

Back to first citation ↑
C205ESource checked · pending review

The HD-BNC guide places 034-1018 among its 75-ohm PCB jacks and describes a straight end-launch, rear-bulkhead-mount configuration.

Amphenol RF · Amphenol RF HD-BNC guide — three named PCB jack rows ↗

Locator: Printed p.4 (PDF p.4): PCB Jacks (50 Ohm), row 034-5013. Printed p.5 (PDF p.5): PCB Jacks (75 Ohm), rows 034-1018 and 034-1021; row 034-1018 photo inspected.
Access: public pdf text. This URL is already present as S423. S540 is a new dated, narrower observation, not a newly discovered URL. Small row image is qualitative; no exact interface geometry, dimensions or SDI performance imported.

S540: full source recordInspect review dependencies → (private workspace)

Claim scope: Printed p.5, exact 034-1018 row. No dimensions or common footprint are inferred.. Next review due 2027-01-10.

Back to first citation ↑
C205FSource checked · pending review

The HD-BNC guide places 034-5013 among its 50-ohm PCB jacks and describes a straight end-launch, rear-bulkhead-mount configuration.

Amphenol RF · Amphenol RF HD-BNC guide — three named PCB jack rows ↗

Locator: Printed p.4 (PDF p.4): PCB Jacks (50 Ohm), row 034-5013. Printed p.5 (PDF p.5): PCB Jacks (75 Ohm), rows 034-1018 and 034-1021; row 034-1018 photo inspected.
Access: public pdf text. This URL is already present as S423. S540 is a new dated, narrower observation, not a newly discovered URL. Small row image is qualitative; no exact interface geometry, dimensions or SDI performance imported.

S540: full source recordInspect review dependencies → (private workspace)

Claim scope: Printed p.4, exact 034-5013 row. Similar role words do not establish interchangeability with the 75-ohm example.. Next review due 2027-01-10.

Back to first citation ↑
C205GSource checked · pending review

The guide places HD-BNC 034-1021 among 75-ohm PCB jacks with straight, through-hole termination; the row has no text in its Features cell.

Amphenol RF · Amphenol RF HD-BNC guide — three named PCB jack rows ↗

Locator: Printed p.4 (PDF p.4): PCB Jacks (50 Ohm), row 034-5013. Printed p.5 (PDF p.5): PCB Jacks (75 Ohm), rows 034-1018 and 034-1021; row 034-1018 photo inspected.
Access: public pdf text. This URL is already present as S423. S540 is a new dated, narrower observation, not a newly discovered URL. Small row image is qualitative; no exact interface geometry, dimensions or SDI performance imported.

S540: full source recordInspect review dependencies → (private workspace)

Claim scope: Printed p.5, exact row. A blank cell is unknown information, not an explicit no-mount statement.. Next review due 2027-01-10.

Suggest a correction to this field note →

Common questions

Questions this record can help resolve

BNC, Mini-BNC and HD-BNC: are they the same connector?A panel-density illustration is not a mating-interface drawing, and similar names do not identify the same counterpart.Does an HD-BNC connector guarantee 75 ohms or 12G-SDI?Separate physical form, impedance, the named 12G subset and a complete path’s operating requirements.

Put this field note to work.

Add to discovery trayRecord an unsaved candidate (private workspace)

Compare look-alikes: BNC versus Mini-BNC versus HD-BNC

Candidate selection does not confirm the identity or capabilities of your physical item.

SOURCE-QUALIFIED COAXIAL REFERENCE

Separate the interface, mounting and termination.

Amphenol RF 034-1018 — printed guide p.5

Source / component role
Straight end-launch PCB jack with rear bulkhead mounting.
Documented distinction
Listed in the guide section for 75-ohm PCB jacks.
What this establishes
This row supplies a named role and impedance category; the small image supports only a broad exterior study.
Not established
No contact interiors, terminal dimensions, board footprint, mounting stack or SDI performance is inferred.
Next check
Use the exact component drawing and system specifications to check geometry and electrical requirements.
Inspect the declared view → (private workspace)
Evidence, observation & limits

Inspected . C205E

Amphenol RF HD-BNC guide — three named PCB jack rows ↗
V132 observation: Printed p.4 (PDF p.4): PCB Jacks (50 Ohm), row 034-5013. Printed p.5 (PDF p.5): PCB Jacks (75 Ohm), rows 034-1018 and 034-1021; row 034-1018 photo inspected.
Canonical source record S540 dated 2026-10-12. The V132 visit is recorded separately; inherited source dates are unchanged.

No hardware test, independent technical approval or rights clearance is asserted.

Amphenol RF 034-5013 — printed guide p.4

Source / component role
Straight end-launch PCB jack with rear bulkhead mounting.
Documented distinction
Listed in the guide section for 50-ohm PCB jacks.
What this establishes
Shared role words do not make this the same specified component as 034-1018.
Not established
No interchangeable footprint, mating approval, common impedance or new physical view is claimed.
Next check
Keep the exact part number and required impedance alongside the board drawing; do not infer equivalence from the family name.

No source-observed physical view is selected for this row.

Evidence, observation & limits

Inspected . C205F

Amphenol RF HD-BNC guide — three named PCB jack rows ↗
V132 observation: Printed p.4 (PDF p.4): PCB Jacks (50 Ohm), row 034-5013. Printed p.5 (PDF p.5): PCB Jacks (75 Ohm), rows 034-1018 and 034-1021; row 034-1018 photo inspected.
Canonical source record S540 dated 2026-10-12. The V132 visit is recorded separately; inherited source dates are unchanged.

No hardware test, independent technical approval or rights clearance is asserted.

Amphenol RF 034-1021 — printed guide p.5

Source / component role
Straight through-hole PCB jack.
Documented distinction
Listed among 75-ohm PCB jacks; its Features cell is blank.
What this establishes
Through-hole termination is documented. The absent feature text is not an explicit no-mount statement.
Not established
The row alone does not settle panel mounting, mounting hardware, footprint or system performance.
Next check
Obtain the exact drawing for the missing mechanical information; preserve the blank as unknown until it is supported.

No source-observed physical view is selected for this row.

Evidence, observation & limits

Inspected . C205G

Amphenol RF HD-BNC guide — three named PCB jack rows ↗
V132 observation: Printed p.4 (PDF p.4): PCB Jacks (50 Ohm), row 034-5013. Printed p.5 (PDF p.5): PCB Jacks (75 Ohm), rows 034-1018 and 034-1021; row 034-1018 photo inspected.
Canonical source record S540 dated 2026-10-12. The V132 visit is recorded separately; inherited source dates are unchanged.

No hardware test, independent technical approval or rights clearance is asserted.

Read the coaxial role chart and field guide →

Evidence behind this page

Scope first. Source second. Approval separate.

3 linked sources · 7 scoped claims · 0 sources with inspection/access flags.

Page scope: catalogue_expansion_v36

Assessment 2026-10-22 · earliest scheduled source review 2027-01-03. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 3 source scopes, access limits and dates

S208 · HD-BNC connectors

Amphenol RF · Manufacturer / product-owner domain · inspected 2026-10-05 · due 2027-01-03

Within inspection window

Scoped support: Identifies HD-BNC as a compact bayonet-style coaxial connector family with 50-ohm and 75-ohm product variants.

Not established / limitations: Identification/reference scope only. V36 does not convert this source into a universal pinout, fabrication drawing, electrical approval or end-to-end compatibility verdict.

Locator: HD-BNC product-family overview

S423 · Amphenol RF HD-BNC Product Series Solutions Guide

Amphenol RF · Manufacturer / product-owner domain · inspected 2026-10-07 · due 2027-01-05

Within inspection window

Scoped support: Manufacturer HD-BNC family and explicitly named adapter/12G examples.

Not established / limitations: No explicit revision date was observed. Full IEC 61169-70 was not inspected; its mention is a locator, not a reproduced standard. No family-wide maximum, interface dimensions or fabrication tolerances are adopted.

Locator: Printed pages 3–4, 9 and 11: bayonet and impedance options, interface drawings, between-series adapters and named 12G subset.

S540 · Amphenol RF HD-BNC guide — three named PCB jack rows

Amphenol RF · Manufacturer / product-owner domain · inspected 2026-10-12 · due 2027-01-10

Within inspection window

Scoped support: Only these three named rows and their section headings. The 034-1021 Features cell is blank: it does not establish an explicit absence of mounting features.

Not established / limitations: This URL is already present as S423. S540 is a new dated, narrower observation, not a newly discovered URL. Small row image is qualitative; no exact interface geometry, dimensions or SDI performance imported.

Locator: Printed p.4 (PDF p.4): PCB Jacks (50 Ohm), row 034-5013. Printed p.5 (PDF p.5): PCB Jacks (75 Ohm), rows 034-1018 and 034-1021; row 034-1018 photo inspected.

Trace 7 claims to their source records

C205A · P205

Amphenol RF identifies HD-BNC as a compact bayonet-style coaxial connector family offered in 50-ohm and 75-ohm variants.

Claim scope: V36 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction or end-to-end compatibility proof.

Source links: S208 · Evidence trail → (private workspace)

C205B · P205

Amphenol’s HD-BNC guide describes a bayonet interface with separate 50-ohm and 75-ohm offerings.

Claim scope: Printed pages 3–4; no full standard review, interface dimensions or universal operating-frequency maximum.

Source links: S423 · Evidence trail → (private workspace)

C205C · P205

The guide lists APH-BNCJ-HDBNCJ as a straight 75-ohm between-series adapter with an HD-BNC jack on one side and a BNC jack on the other.

Claim scope: Printed page 9 ordering row only; existence of an adapter does not make the bare interfaces the same.

Source links: S423 · Evidence trail → (private workspace)

C205D · P205

Amphenol identifies a 12G HD-BNC product line for 12G-SDI use and lists named 12G parts; its performance discussion refers to a mated pair from that line.

Claim scope: Printed page 11; no transfer of the named subset’s statement to every HD-BNC product or to a complete cable path.

Source links: S423 · Evidence trail → (private workspace)

C205E · P205

The HD-BNC guide places 034-1018 among its 75-ohm PCB jacks and describes a straight end-launch, rear-bulkhead-mount configuration.

Claim scope: Printed p.5, exact 034-1018 row. No dimensions or common footprint are inferred.

Source links: S540 · Evidence trail → (private workspace)

C205F · P205

The HD-BNC guide places 034-5013 among its 50-ohm PCB jacks and describes a straight end-launch, rear-bulkhead-mount configuration.

Claim scope: Printed p.4, exact 034-5013 row. Similar role words do not establish interchangeability with the 75-ohm example.

Source links: S540 · Evidence trail → (private workspace)

C205G · P205

The guide places HD-BNC 034-1021 among 75-ohm PCB jacks with straight, through-hole termination; the row has no text in its Features cell.

Claim scope: Printed p.5, exact row. A blank cell is unknown information, not an explicit no-mount statement.

Source links: S540 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.