Side by side

BNC vs TNC coaxial connectors

BNC uses bayonet coupling while TNC uses threaded coupling. Connector family, impedance and application still need to be verified independently.

Computer-generated illustration, not a photograph. — P027 · ConnectorBNC connector

How they differ

BNC connector Look for the bayonet coupling rather than a threaded connector. Verify the actual part number when impedance matters.
TNC coaxial connector Look for the threaded coupling and compare against TNC documentation rather than forcing a BNC-style bayonet connection.

At a glance

Source-scoped form facts; counts, variants and unknowns are distinct
Field	BNC connector	TNC coaxial connector
Type	Connector	Connector
Family	Coax	Coax
Shape	round	round
Nominal contacts	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Positions / cavity span	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact rows	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector role	plug; socketS029 · S371Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. coaxial plug and jack interface	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Key distinction	A locking fit is not an impedance match.	Coupling style is a useful identifier, but it does not establish impedance or system performance.

Full evidence ledger and sources ↓

Illustrations are computer-generated with prior AI visual review; independent technical and rights review pending. A comparison is not a compatibility verdict.

This comparison stays within one evidence layer.

All selected records are Connector records. Similar layer does not mean compatible, interchangeable or safe to mate.

Families represented: Coax

The reference ledger

Read the same question across.

2 selected records · 16 fields
No score. No compatibility verdict.

On a narrow screen, scroll the table sideways or open the field-by-field reading view below. Illustrations are not a size comparison.

Comparison of selected field notes; source links accompany each documented specification
What you are comparing	P027 / ConnectorBNC connector Identification schematic · not to scale · drawing review pending	P226 / ConnectorTNC coaxial connector Identification schematic · not to scale · drawing review pending
Layer	Connector	Connector
Key distinction	A locking fit is not an impedance match.	Coupling style is a useful identifier, but it does not establish impedance or system performance.
Nominal contacts	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Positions / cavity span	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Populated contacts	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact rows	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact pitch	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Dimensions / axis	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector role	plug; socketS029 · S371Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. coaxial plug and jack interface	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Coupling / latch	bayonet (Claim C027A); bayonet (Claim C027C); BayonetS029 · S371 · S029Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Consumer identification / documented standard or product class only BNC coupling, impedance-family and interface-standard context only; no universal frequency or cable-performance claim. Named series only, not every family part: Amphenol RF 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.	threaded (Claim C226C); ThreadedS539 · S230Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Only exact part 122108; not a claim about reverse-polarity parts or every TNC connector. Named series only, not every family part: Amphenol RF TNC 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.
Keying / polarization	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Coupling	BayonetC027A · C027B	Not an equivalent field
Impedance	Variant-specific; 50 Ω and 75 Ω familiesC027A · C027B	Not an equivalent field
Impedance matching boundary	Amphenol warns that physical mating, where possible, does not remove a 50/75-ohm impedance mismatch; reflections and signal degradation remain concerns.C027D	Not an equivalent field
Documented identification	Not an equivalent field	Threaded TNC coaxial connector family.C226A
Evidence	C027A,C027B,C027D → Independent review pending	C226A,C226C,C226D,C226E,C226F,C226G,C226X → Independent review pending

Read field by field — no sideways scrolling

The same selected records, fields, values and source links as the table. Missing fields remain non-equivalent; no values are merged.

Layer

BNC connectorP027 / Connector: Connector
TNC coaxial connectorP226 / Connector: Connector

Key distinction

BNC connectorP027 / Connector: A locking fit is not an impedance match.
TNC coaxial connectorP226 / Connector: Coupling style is a useful identifier, but it does not establish impedance or system performance.

Nominal contacts

BNC connectorP027 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
TNC coaxial connectorP226 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Positions / cavity span

BNC connectorP027 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
TNC coaxial connectorP226 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Populated contacts

BNC connectorP027 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
TNC coaxial connectorP226 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact rows

BNC connectorP027 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
TNC coaxial connectorP226 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact pitch

BNC connectorP027 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
TNC coaxial connectorP226 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Dimensions / axis

BNC connectorP027 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
TNC coaxial connectorP226 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Connector role

BNC connectorP027 / Connector: plug; socketS029 · S371Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. coaxial plug and jack interface
TNC coaxial connectorP226 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Coupling / latch

BNC connectorP027 / Connector: bayonet (Claim C027A); bayonet (Claim C027C); BayonetS029 · S371 · S029Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Consumer identification / documented standard or product class only BNC coupling, impedance-family and interface-standard context only; no universal frequency or cable-performance claim. Named series only, not every family part: Amphenol RF 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.
TNC coaxial connectorP226 / Connector: threaded (Claim C226C); ThreadedS539 · S230Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Only exact part 122108; not a claim about reverse-polarity parts or every TNC connector. Named series only, not every family part: Amphenol RF TNC 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.

Keying / polarization

BNC connectorP027 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
TNC coaxial connectorP226 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Coupling

BNC connectorP027 / Connector: BayonetC027A · C027B
TNC coaxial connectorP226 / Connector: Not an equivalent field

Impedance

BNC connectorP027 / Connector: Variant-specific; 50 Ω and 75 Ω familiesC027A · C027B
TNC coaxial connectorP226 / Connector: Not an equivalent field

Impedance matching boundary

BNC connectorP027 / Connector: Amphenol warns that physical mating, where possible, does not remove a 50/75-ohm impedance mismatch; reflections and signal degradation remain concerns.C027D
TNC coaxial connectorP226 / Connector: Not an equivalent field

Documented identification

BNC connectorP027 / Connector: Not an equivalent field
TNC coaxial connectorP226 / Connector: Threaded TNC coaxial connector family.C226A

Evidence

BNC connectorP027 / Connector: C027A,C027B,C027D →
Independent review pending
TNC coaxial connectorP226 / Connector: C226A,C226C,C226D,C226E,C226F,C226G,C226X →
Independent review pending

Your next step

Use the distinction in context.

Open the field notes Read source-linked facts and limitations.Compare another pair Start from a common confusion.Check a connection A comparison is not a compatibility verdict.

Continue the distinction

Compare next

Browse every comparison →

BNC versus Mini-BNC versus HD-BNCWhich bayonet/coaxial interface family is actually documented for the equipment? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.TNC versus RP-TNCIs the threaded TNC interface standard or reverse polarity? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.LEMO broadcast 75-ohm versus 00 NIM-CAMAC 50-ohm triaxIs the documented interface a 75-ohm broadcast triax form or the 50-ohm LEMO 00 NIM-CAMAC form? Impedance and series identity are not interchangeable.MCX versus MMCXWhich miniature snap-on coaxial family matches the documented component? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.N-Type versus RP-N-TypeIs the center-contact convention standard N-Type or reverse-polarity N-Type? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.SMA versus RP-SMAThe center contact matters as well as the threaded outer shell.

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Evidence behind this page

Scope first. Source second. Approval separate.

7 linked sources · 10 scoped claims · 0 sources with inspection/access flags.

Page scope: Evidence behind the compared records; the editorial comparison still needs separate review.

Assessment 2026-10-22 · earliest scheduled source review 2026-12-30. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 7 source scopes, access limits and dates

S029 · BNC connectors

Amphenol RF · Manufacturer / product-owner domain · inspected 2026-10-01 · due 2026-12-30

Within inspection window

Scoped support: Bayonet coupling; 50-ohm and 75-ohm variants.

Not established / limitations:

Locator: BNC product family

S030 · Can I use 50-ohm connectors in a 75-ohm system?

Amphenol RF · Manufacturer / product-owner domain · inspected 2026-10-01 · due 2026-12-30

Within inspection window

Scoped support: Mechanical fit does not establish RF impedance compatibility.

Not established / limitations:

Locator: Impedance mismatch explanation

S230 · TNC connectors

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

Within inspection window

Scoped support: Identifies TNC as a threaded coaxial connector family and notes standard and reverse-polarity formats.

Not established / limitations: Identification/reference scope only. V39 does not convert this source into a universal pinout, fabrication drawing, electrical approval, protocol guarantee or end-to-end compatibility verdict.

Locator: TNC overview

S425 · Amphenol RF — 50-ohm connectors in a 75-ohm system

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

Within inspection window

Scoped support: Manufacturer warning about an impedance mismatch even where unlike-impedance connectors can mate.

Not established / limitations: Does not assert that every 50/75-ohm connector pair physically mates, quantify a universal loss, or establish the rating of an unidentified connector.

Locator: Full FAQ answer: physical mating is distinct from impedance matching and signal reflections.

S539 · Amphenol RF 122108 — TNC cable termination and role

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

Within inspection window

Scoped support: Only this 50-ohm straight TNC crimp plug, with RG-58, RG-141 and Times LMR-195 among the explicitly listed cables. A cable-family listing is not a universal preparation or tooling specification.

Not established / limitations: Product text checked. Linked customer drawing could not be inspected; no physical study, contact arrangement, strip lengths or installation sequence inferred.

Locator: Exact part 122108: heading; Gender, Impedance, Coupling Mechanism, Contact Termination, Cable Type and Panel Mounting Feature rows.

S556 · Amphenol RF 122108 — current material field

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

Within inspection window

Scoped support: The observed product page lists PTFE. This disagrees with the Delrin entry in the separately acquired revision B drawing; no resolution or supersession is established.

Not established / limitations: Source scope and revision retained. No manufacturing dimensions, current-revision equivalence, mating approval or hardware testing.

Locator: Product Specifications: Insulator Material, component role and termination fields.

S557 · Amphenol Connex 122108 — historical revision B drawing

Amphenol Connex (manufacturer drawing hosted by Aircraft Spruce) · Unclassified publisher domain · inspected 2026-10-12 · due 2027-01-10

Within inspection window

Scoped support: Historical manufacturer-authored drawing, hosted by a distributor. Two qualitative views retain revision B / 2008-07-16. Current dimensional or material equivalence is unverified; installation dimensions are omitted.

Not established / limitations: Source scope and revision retained. No manufacturing dimensions, current-revision equivalence, mating approval or hardware testing.

Locator: Single page: drawing number 122108.DWG, revision B, issue date 07/16/08; body elevation, separate pin and ferrule, title block and materials table visually inspected.

Trace 10 claims to their source records

C027A · P027

BNC uses a bayonet coupling; both 50-ohm and 75-ohm variants exist.

Claim scope: Consumer identification / documented standard or product class only

Source links: S029 · Evidence trail → (private workspace)

C027B · P027

Mechanically mating RF components can still create an impedance mismatch.

Claim scope: Narrowly stated supporting distinction; not an end-to-end device guarantee

Source links: S030 · Evidence trail → (private workspace)

C027D · P027

Amphenol warns that physical mating, where possible, does not remove a 50/75-ohm impedance mismatch; reflections and signal degradation remain concerns.

Claim scope: Full manufacturer FAQ answer; not a claim that every unlike-impedance pair mechanically fits or a numeric loss forecast.

Source links: S425 · Evidence trail → (private workspace)

C226A · P226

Amphenol RF identifies TNC as a threaded coaxial connector family available in standard and reverse-polarity formats.

Claim scope: V39 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof.

Source links: S230 · Evidence trail → (private workspace)

C226C · P226

Amphenol RF identifies 122108 as a straight TNC plug with threaded coupling, crimp contact termination and 50-ohm impedance.

Claim scope: Only exact part 122108; not a claim about reverse-polarity parts or every TNC connector.

Source links: S539 · Evidence trail → (private workspace)

C226D · P226

The 122108 page lists cable-crimp termination and no applicable panel-mounting feature; RG-58, RG-141 and Times LMR-195 appear among its specified cable types.

Claim scope: Selected manufacturer cable entries, not a complete cable list, strip specification or tooling approval.

Source links: S539 · Evidence trail → (private workspace)

C226E · P226

The manufacturer-authored 122108 drawing, revision B dated 16 July 2008, depicts the connector body, contact pin and ferrule separately.

Claim scope: Historical revision only; separated components are not an assembled cable or instructions for preparing one.

Source links: S557 · Evidence trail → (private workspace)

C226F · P226

The same revision B drawing shows a knurled coupling region on the body and a narrower, stepped cable-side tail.

Claim scope: Qualitative exterior recognition from the dated drawing; no dimensions, hidden contacts or current manufacturing equivalence.

Source links: S557 · Evidence trail → (private workspace)

C226G · P226

The 122108 revision B materials table names Delrin for the insulator, while the product page observed on 12 October 2026 names PTFE.

Claim scope: Unresolved difference between a historical drawing and the current page. Neither value is selected as a verified specification for a supplied part.

Source links: S556 · S557 · Evidence trail → (private workspace)

C226X · P226

Amphenol RF 122108 is a straight TNC plug. Its table reports brass body; nickel finish, brass contact; gold finish, cable-crimp construction; crimp contact termination, threaded coupling, 50-ohm impedance, a 11-GHz frequency ceiling and 500 minimum mating cycles. These are exact-part manufacturer specifications, not family-wide ratings or independent test results.

Claim scope: Only Amphenol RF 122108, the named straight TNC plug. No family-wide geometry, mating pair, installed-cable performance or operating approval follows.

Source links: S539 · Evidence trail → (private workspace)

Prepare this page for review →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.