Side by side

FC vs ST fiber connectors

Distinguish the documented FC key/adapter arrangements from the ST bayonet example. A hybrid sleeve does not settle polish, fiber type or optical loss.

Computer-generated illustration, not a photograph. — P203 · ConnectorFC fiber connector

How they differ

FC fiber connector Identify the connector family and then verify polish, fiber type, optical specification and cleanliness requirements separately.
ST fiber connector Use equipment labels and an exterior manufacturer illustration. Do not inspect the end face with your eye or an ordinary magnifier.

At a glance

Source-scoped form facts; counts, variants and unknowns are distinct
Field	FC fiber connector	ST fiber connector
Type	Connector	Connector
Family	Fiber	Fiber
Shape	round	optical
Nominal contacts	Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.	Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
Positions / cavity span	Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.	Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
Contact rows	Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.	Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
Connector role	optical connector subassembly (ExactCorning 732-1021-005-B)S951Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. ExactCorning 732-1021-005-B	optical connector subassembly (ExactCorning 730-1021-006-B)S951Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. ExactCorning 730-1021-006-B
Key distinction	A threaded fiber connector does not identify fiber type, polish, wavelength or link budget.	Identify the outside; never look into a fiber.

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: Fiber

Look here first

Spot the difference.

Read the views →

Not a size comparison. Illustrations fit the same display boxes; their physical dimensions are not shown to a common scale. No mating or compatibility verdict follows.

P203 / Exterior side view

FC fiber connector

Plug-style exterior

Visible clue: FC cable-end body and coupling collar

Still check: Confirm the exact FC key and adapter documentation rather than judging a face pattern.

P124 / Exterior side view

ST fiber connector

Plug-style exterior

Visible clue: ST exterior and documented bayonet coupling

Still check: Keep connector identification separate from polish, fiber and equipment requirements.

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	P203 / ConnectorFC fiber connector Identification schematic · not to scale · drawing review pending	P124 / ConnectorST fiber connector Identification schematic · not to scale · drawing review pending
Layer	Connector	Connector
Key distinction	A threaded fiber connector does not identify fiber type, polish, wavelength or link budget.	Identify the outside; never look into a fiber.
Nominal contacts	Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.	Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
Positions / cavity span	Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.	Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
Populated contacts	Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.	Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
Contact rows	Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.	Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
Contact pitch	Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.	Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
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	optical connector subassembly (ExactCorning 732-1021-005-B)S951Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. ExactCorning 732-1021-005-B	optical connector subassembly (ExactCorning 730-1021-006-B)S951Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. ExactCorning 730-1021-006-B
Coupling / latch	threaded metal coupling nut (Named series/reference only, not every family part. AFL FC marketedconnector overview;not universalfamily mechanicaltolerance)S954Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. Named series/reference only, not every family part. AFL FC marketedconnector overview;not universalfamily mechanicaltolerance	bayonet (Claim C124A); quick-release bayonet (Named series/reference only, not every family part. AFL ST marketedconnector overview;not universalfamily mechanicaltolerance)S099 · S954Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. Identification and explicitly scoped documentation only; not an end-to-end connection approval Named series/reference only, not every family part. AFL ST marketedconnector overview;not universalfamily mechanicaltolerance
Keying / polarization	fixed key (ExactCorning 732-1021-005-B)S951Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. ExactCorning 732-1021-005-B	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Documented identification	FC-PC fiber connector family identification.C203A	The ST guide identifies a round body with bayonet-style retention.C124A
FC source example	Corning’s 722-series FC-PC description offers fixed or removable keys and pre-radiused zirconia ferrules.C203B	Not an equivalent field
Important distinction	Not an equivalent field	Cisco warns against looking into energized fiber and using unfiltered magnifiers for optical inspection.C124B
Named ST construction	Not an equivalent field	TE’s 5504008-series ST kit example has an alignment key, metal coupling nut and stainless-steel ferrule. Its 501381-1 receptacle is described for joining two bayonet connectors.C124C
Evidence	C203A,C203B,C203C,C203D,C203E,C203F,C203G → Independent review pending	C124A,C124B,C124C,C124D,C124E,C124F,C124G → 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

FC fiber connectorP203 / Connector: Connector
ST fiber connectorP124 / Connector: Connector

Key distinction

FC fiber connectorP203 / Connector: A threaded fiber connector does not identify fiber type, polish, wavelength or link budget.
ST fiber connectorP124 / Connector: Identify the outside; never look into a fiber.

Nominal contacts

FC fiber connectorP203 / Connector: Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
ST fiber connectorP124 / Connector: Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.

Positions / cavity span

FC fiber connectorP203 / Connector: Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
ST fiber connectorP124 / Connector: Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.

Populated contacts

FC fiber connectorP203 / Connector: Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
ST fiber connectorP124 / Connector: Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.

Contact rows

FC fiber connectorP203 / Connector: Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
ST fiber connectorP124 / Connector: Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.

Contact pitch

FC fiber connectorP203 / Connector: Not applicableS206 · S420 · S420 · S530 · S420Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.
ST fiber connectorP124 / Connector: Not applicableS099 · S104 · S421 · S529 · S530Optical connector end: electrical contact/pin quantities are not applicable. Fiber count and internal transmitter/receiver module terminals are different facts.

Dimensions / axis

FC fiber connectorP203 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
ST fiber connectorP124 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Connector role

FC fiber connectorP203 / Connector: optical connector subassembly (ExactCorning 732-1021-005-B)S951Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. ExactCorning 732-1021-005-B
ST fiber connectorP124 / Connector: optical connector subassembly (ExactCorning 730-1021-006-B)S951Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. ExactCorning 730-1021-006-B

Coupling / latch

FC fiber connectorP203 / Connector: threaded metal coupling nut (Named series/reference only, not every family part. AFL FC marketedconnector overview;not universalfamily mechanicaltolerance)S954Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. Named series/reference only, not every family part. AFL FC marketedconnector overview;not universalfamily mechanicaltolerance
ST fiber connectorP124 / Connector: bayonet (Claim C124A); quick-release bayonet (Named series/reference only, not every family part. AFL ST marketedconnector overview;not universalfamily mechanicaltolerance)S099 · S954Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. Identification and explicitly scoped documentation only; not an end-to-end connection approval Named series/reference only, not every family part. AFL ST marketedconnector overview;not universalfamily mechanicaltolerance

Keying / polarization

FC fiber connectorP203 / Connector: fixed key (ExactCorning 732-1021-005-B)S951Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. ExactCorning 732-1021-005-B
ST fiber connectorP124 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Documented identification

FC fiber connectorP203 / Connector: FC-PC fiber connector family identification.C203A
ST fiber connectorP124 / Connector: The ST guide identifies a round body with bayonet-style retention.C124A

FC source example

FC fiber connectorP203 / Connector: Corning’s 722-series FC-PC description offers fixed or removable keys and pre-radiused zirconia ferrules.C203B
ST fiber connectorP124 / Connector: Not an equivalent field

Important distinction

FC fiber connectorP203 / Connector: Not an equivalent field
ST fiber connectorP124 / Connector: Cisco warns against looking into energized fiber and using unfiltered magnifiers for optical inspection.C124B

Named ST construction

FC fiber connectorP203 / Connector: Not an equivalent field
ST fiber connectorP124 / Connector: TE’s 5504008-series ST kit example has an alignment key, metal coupling nut and stainless-steel ferrule. Its 501381-1 receptacle is described for joining two bayonet connectors.C124C

Evidence

FC fiber connectorP203 / Connector: C203A,C203B,C203C,C203D,C203E,C203F,C203G →
Independent review pending
ST fiber connectorP124 / Connector: C124A,C124B,C124C,C124D,C124E,C124F,C124G →
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 →

ST, SC and LC fiber formsIdentify exterior form only; no optical compatibility result.LC versus SCIdentify the optical connector family; verify fiber and end-face polish independently.opticalCON DUO versus QUADDoes the fiber system specify opticalCON DUO or QUAD, and how many optical channels are documented? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.SMPTE 304M camera connector versus opticalCON DUO SMPTEDoes the camera link require the SMPTE 304M connector family or the distinct opticalCON DUO SMPTE system? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.BNC vs TNC coaxial connectorsBNC uses bayonet coupling while TNC uses threaded coupling. Connector family, impedance and application still need to be verified independently.DisplayPort connector vs DisplayPort 2.1The full-size DisplayPort connector does not identify the implemented DisplayPort generation, link rate or optional features.

Adjust this comparison

Add a field note

Evidence behind this page

Scope first. Source second. Approval separate.

9 linked sources · 14 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 2027-01-01. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 9 source scopes, access limits and dates

S099 · Fiber connector guide — ST outline

C2G / Legrand · Manufacturer / product-owner domain · inspected 2026-10-03 · due 2027-01-01

Within inspection window

Scoped support: ST uses a round body and bayonet retention; SC uses a different housing and retention style.

Not established / limitations: No fiber compatibility, optical-budget calculation or end-face inspection instruction is derived from housing shape.

Locator: ST; SC

S104 · Fiber-optic inspection safety boundaries

Cisco · Manufacturer / product-owner domain · inspected 2026-10-03 · due 2027-01-01

Within inspection window

Scoped support: Do not look into energized fiber or use unfiltered magnifiers to inspect optical connectors.

Not established / limitations: V12 does not reproduce or authorize cleaning, live inspection, loss testing or optical engineering procedures.

Locator: Warnings

S206 · FC connectors and adapters

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

Within inspection window

Scoped support: Identifies FC-PC fiber-optic connector and adapter products as a threaded circular fiber-connector family.

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: FC connector and adapter overview

S420 · Corning FC-PC connectors and adapters — CAH-136_AEN

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

Within inspection window

Scoped support: 722-series connector and 740-series adapter examples in the 2016-11-29 revision.

Not established / limitations: No universal FC key-width, ferrule-diameter, polish-conversion or loss-budget assertion. Do not use the panel-mount descriptions as mating-interface dimensions.

Locator: Pages 1 and 3: 722-series key and ferrule description; 740-series FC and hybrid FC-ST ordering table.

S421 · TE ST stainless-steel ferrule kits and coupling receptacle — 408-4151 Rev B

TE Connectivity / Tyco Electronics · Manufacturer / product-owner domain · inspected 2026-10-07 · due 2027-01-05

Within inspection window

Scoped support: Named ST stainless-steel kit and bayonet-coupling example; revision B dated 2008-12-03.

Not established / limitations: Only page 1 was visually inspected. No assembly instructions, tolerances, fiber preparation dimensions or universal ferrule-material claim are reproduced. Parts of the PDF text layer are garbled; Figure 1 labels were visually checked.

Locator: Page 1: Figure 1 alignment key and ferrule labels; kit 5504008 series and coupling receptacle 501381-1.

S529 · UniCam high-performance connectors — family sheet 0250 EMEA

Corning · Manufacturer / product-owner domain · inspected 2026-10-11 · due 2027-01-09

Within inspection window

Scoped support: Dated family and selected order-code observations, not a current-availability claim. Physical study is the photographed multimode ST-compatible family example, not an exact order-code assignment.

Not established / limitations: Dated family and selected order-code observations, not a current-availability claim. Physical study is the photographed multimode ST-compatible family example, not an exact order-code assignment.

Locator: Revision 2018-01-22; printed pp.1, 3–4: photograph CRR1245, single-mode table, LC/SC/ST ordering rows.

S530 · Fiber Optic OEM Products — component ordering guide OEM-064-AEN

Corning · Manufacturer / product-owner domain · inspected 2026-10-11 · due 2027-01-09

Within inspection window

Scoped support: Only selected part identifiers, declared form, mode and pin/key descriptions. Dimensional fields and loss ratings are not imported. The SC boot-size typo and unlabeled ferrule-size interpretation are quarantined.

Not established / limitations: Only selected part identifiers, declared form, mode and pin/key descriptions. Dimensional fields and loss ratings are not imported. The SC boot-size typo and unlabeled ferrule-size interpretation are quarantined.

Locator: May 2020; printed p.5 ST/FC rows, p.6 LC table, p.9 MT-RJ row.

S951 · AFOP FastShip Connector and Adapter Ordering Guide OEM-064-AEN

Corning · Manufacturer / product-owner domain · inspected 2026-10-22 · due 2027-01-20

Within inspection window

Scoped support: Exact named connector/subassembly construction and named no-logo option; keep each role separate.

Not established / limitations: Direct download403 and drawing/photo pixels unavailable. Table126/127micrometre ferrule-size values are not imported as outer ferrule diameters; unspecified SCboot3micrometre transcription is excluded. Table colors are exact-part descriptors, not general family marks.

Locator: Full18-page PDF text: p.5ST/FC/SC,p.6LCno-logo variants,p.9MT-RJ,p.11ST/FCsubassemblies,p.18revision.

S954 · Adapters and Connectors:Connectors

AFL Hyperscale · Unclassified publisher domain · inspected 2026-10-22 · due 2027-01-20

Within inspection window

Scoped support: AFL marketed connector-series examples: stated ferrule nominal sizes and coupling mechanisms; no exact orderableSKU.

Not established / limitations: Ferrule dimensions refer to AFL overview context, not universal housing/mating tolerances. Image-only latch/body observations remain labelled manufacturer illustrations; no measurements,partmarkings or performance from pixels.

Locator: Full manufacturer page: LC,SC,ST,FCsections and each directlylinked connector image; all4actual JPEGs downloaded/viewed.

Trace 14 claims to their source records

C124A · P124

The ST guide identifies a round body with bayonet-style retention.

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval

Source links: S099 · Evidence trail → (private workspace)

C124B · P124

Cisco warns against looking into energized fiber and using unfiltered magnifiers for optical inspection.

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval

Source links: S104 · Evidence trail → (private workspace)

C124C · P124

TE’s 5504008-series ST kit example has an alignment key, metal coupling nut and stainless-steel ferrule. Its 501381-1 receptacle is described for joining two bayonet connectors.

Claim scope: TE 408-4151 Rev B, page 1 only; named component example, not every ST ferrule or a fabrication drawing.

Source links: S421 · Evidence trail → (private workspace)

C124D · P124

The UniCam single-mode table identifies the ST-compatible variant as UPC with an amber housing and blue boot; its ordering table lists 95-200-51 for single-mode OS2.

Claim scope: Named Corning family and dated order code. The amber housing is not evidence of multimode fiber or a generic color-to-polish rule.

Source links: S529 · Evidence trail → (private workspace)

C124E · P124

Corning’s May 2020 OEM guide lists 720-2040-0500B as an ST single-mode connector with metal housing, blue boot and a clear dust cap.

Claim scope: Exact listed kit identity. The printed disassembled parts view is not converted into an assembled pinout, dimensional model or current availability claim.

Source links: S530 · Evidence trail → (private workspace)

C124F · P124

AFL lists a nominal 2.5 mm ferrule for its ST connector overview. AFL describes quick-release bayonet(stick and twist) body.

Claim scope: AFL ST marketedconnector overview;not universalfamily mechanicaltolerance;ferrulesize is not outerhousingdimension,contactpitch or sourceimage measurement.

Source links: S954 · Evidence trail → (private workspace)

C124G · P124

Corning OEM-064-AEN lists 730-1021-006-B as: ST single-mode subassembly; metal housing, no boot, yellow dust cap.

Claim scope: Exact named Corningpart/subassembly inMay2020catalog;no universalfinish,matingdimension or assemblyapproval.

Source links: S951 · Evidence trail → (private workspace)

C203A · P203

Corning identifies FC-PC connectors and adapters as a distinct fiber-optic connectivity family.

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

Source links: S206 · Evidence trail → (private workspace)

C203B · P203

Corning’s 722-series FC-PC description offers fixed or removable keys and pre-radiused zirconia ferrules.

Claim scope: CAH-136_AEN revision 2016-11-29, page 1; no inferred key width or universal ferrule construction.

Source links: S420 · Evidence trail → (private workspace)

C203C · P203

Corning’s 740-series ordering table includes FC-ST hybrid adapters, including 740-002N-003 with metal or ceramic sleeve options.

Claim scope: Page 3 of the cited revision; the hybrid connector forms do not establish polish, fiber-type or end-to-end optical compatibility.

Source links: S420 · Evidence trail → (private workspace)

C203D · P203

Corning’s May 2020 OEM guide lists 722-81A0-0330B as a single-mode FC connector with a fixed key and APC designation.

Claim scope: Only that ordering row; an FC coupling shell does not establish polish, key specification or interchangeability for another part.

Source links: S530 · Evidence trail → (private workspace)

C203E · P203

Corning’s 722-series FC-PC sheet presents separate PC, Super PC and Ultra PC columns and separately offers fixed and removable key options.

Claim scope: Family document vocabulary and options only. Its group photograph is not assigned an exact ordered polish or key variant; dimensional and loss fields are not imported.

Source links: S420 · Evidence trail → (private workspace)

C203F · P203

AFL lists a nominal 2.5 mm ferrule for its FC connector overview. AFL describes threadedmetal coupling nut.

Claim scope: AFL FC marketedconnector overview;not universalfamily mechanicaltolerance;ferrulesize is not outerhousingdimension,contactpitch or sourceimage measurement.

Source links: S954 · Evidence trail → (private workspace)

C203G · P203

Corning OEM-064-AEN lists 732-1021-005-B as: FC single-mode subassembly, fixed key; metal housing, no boot, yellow dust cap.

Claim scope: Exact named Corningpart/subassembly inMay2020catalog;no universalfinish,matingdimension or assemblyapproval.

Source links: S951 · 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.