{"id":10588,"date":"2026-05-13T06:34:36","date_gmt":"2026-05-13T06:34:36","guid":{"rendered":"https:\/\/cablefam.com\/?p=10588"},"modified":"2026-08-09T09:26:32","modified_gmt":"2026-08-09T09:26:32","slug":"differences-and-applications-of-lc-sc-st-fc-fiber-connectors","status":"publish","type":"post","link":"https:\/\/cablefam.com\/ja\/blog\/guides-tutorials\/differences-and-applications-of-lc-sc-st-fc-fiber-connectors.html","title":{"rendered":"LC \/ SC \/ ST \/ FC\u30d5\u30a1\u30a4\u30d0\u30fc\u30b3\u30cd\u30af\u30bf\u306e\u9055\u3044\u3068\u7528\u9014"},"content":{"rendered":"<h2 class=\"wp-block-heading\">1. Core Parameter Overview<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">\u30b3\u30cd\u30af\u30bf<\/th><th class=\"has-text-align-center\" data-align=\"center\">Shape<\/th><th class=\"has-text-align-center\" data-align=\"center\">Ferrule Diameter<\/th><th class=\"has-text-align-center\" data-align=\"center\">Locking Method<\/th><th class=\"has-text-align-center\" data-align=\"center\">Port Density<\/th><th class=\"has-text-align-center\" data-align=\"center\">Main Application<\/th><\/tr><\/thead><tbody><tr><td><strong>LC<\/strong><\/td><td>Small square<\/td><td>1.25mm<\/td><td>Snap latch<\/td><td>Highest<\/td><td>Data centers, optical modules, high-density cabling<\/td><\/tr><tr><td><strong>SC<\/strong><\/td><td>Large square<\/td><td>2.5mm<\/td><td>Push-in lock<\/td><td>Medium<\/td><td>Home broadband, PON, ordinary LAN<\/td><\/tr><tr><td><strong>ST<\/strong><\/td><td>Round bayonet<\/td><td>2.5mm<\/td><td>Twist bayonet<\/td><td>Low<\/td><td>Old campus networks, surveillance, legacy building wiring<\/td><\/tr><tr><td><strong>FC<\/strong><\/td><td>Round threaded<\/td><td>2.5mm<\/td><td>Screw fastening<\/td><td>Lowest<\/td><td>ODF racks, base stations, precision instruments, long-distance trunk lines<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">2. Detailed Introduction &amp; Application<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">LC Connector (Small Square)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Structure<\/strong>: Compact square design with spring latch, available in duplex integrated jumpers.<\/li>\n\n\n\n<li><strong>Features<\/strong>: Half the size of SC, <strong>highest port density<\/strong>, easy plug-and-play, low insertion loss.<\/li>\n\n\n\n<li><strong>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/strong>:\n<ol class=\"wp-block-list\">\n<li>Data centers, rack switches, SFP\/SFP+\/QSFP optical modules.<\/li>\n\n\n\n<li>10G\/25G\/100G high-speed fiber links.<\/li>\n\n\n\n<li>High-density patch panels and server rooms.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Its products mainly include<\/strong>\uff1a<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cablefam.com\/wp-content\/uploads\/OS2-LC-TO-LC-DUPLEX-300x300.jpg\" alt=\"OS2 LC TO LC DUPLEX 1\" style=\"object-fit:cover\" title=\"\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cablefam.com\/ja\/product\/lc-upc-to-lc-upc-switchable-uniboot-duplex-os2-single-mode-lszh-2-0mm-fiber-optic-patch-cable.html\">LC UPC to LC UPC Switchable Uniboot Duplex OS2 Single Mode LSZH 2.0mm Fiber Optic Patch Cable<\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cablefam.com\/wp-content\/uploads\/os2-9-1-300x300.webp\" alt=\"\" title=\"\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cablefam.com\/ja\/product\/lc-apc-duplex-os2-single-mode-lszh-2-0mm-fiber-optic-patch-cable.html\">LC APC Duplex OS2 Single Mode LSZH 2.0mm Fiber Optic Patch Cable<\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">SC Connector (Large Square)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Structure<\/strong>: Square push-in design, locks directly after insertion, no rotation or screwing needed.<\/li>\n\n\n\n<li><strong>Features<\/strong>: Cost-effective, durable, simple operation, low failure rate.<\/li>\n\n\n\n<li><strong>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/strong>:\n<ol class=\"wp-block-list\">\n<li>Home broadband, optical modem, operator fiber access.<\/li>\n\n\n\n<li>PON fiber, FTTH access, general enterprise LAN.<\/li>\n\n\n\n<li>Ordinary fiber transceivers and weak current cabinet wiring.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Its products mainly include<\/strong>\uff1a<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cablefam.com\/wp-content\/uploads\/OM3-Fiber4-1-300x300.jpg\" alt=\"OS2 LC TO LC DUPLEX 1\" style=\"object-fit:cover\" title=\"\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cablefam.com\/ja\/product\/lc-upc-to-lc-upc-switchable-uniboot-duplex-os2-single-mode-lszh-2-0mm-fiber-optic-patch-cable.html\"><a href=\"https:\/\/cablefam.com\/ja\/product\/om3-multimode-duplex-sc-upc-to-sc-upc-ofnp-fiber-cable.html\">OM3 Multimode Duplex SC UPC to SC UPC OFNP Fiber Cable<\/a><\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cablefam.com\/wp-content\/uploads\/imgi_58_p920185-640x640-1m-3ft-simplex-os2-single-mode-sc-apc-to-sc-apc-pvc-ofnr-fiber-optic-cable-300x300.jpg\" alt=\"\" title=\"\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cablefam.com\/ja\/product\/lc-apc-duplex-os2-single-mode-lszh-2-0mm-fiber-optic-patch-cable.html\"><a href=\"https:\/\/cablefam.com\/ja\/product\/simplex-os2-single-mode-sc-apc-to-sc-apc-pvc-ofnr-fiber-optic-cable.html\">Simplex OS2 \u30b7\u30f3\u30b0\u30eb\u30e2\u30fc\u30c9 SC APC - SC APC PVC (OFNR) \u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u30b1\u30fc\u30d6\u30eb<\/a><\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">ST Connector (Round Bayonet)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Structure<\/strong>: Round shape, lock by rotating 90\u00b0 after insertion.<\/li>\n\n\n\n<li><strong>Features<\/strong>: Good tensile resistance, bulky and space-consuming, gradually phased out.<\/li>\n\n\n\n<li><strong>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/strong>:\n<ol class=\"wp-block-list\">\n<li>Legacy campus networks, old factories and building cabling.<\/li>\n\n\n\n<li>Security monitoring and industrial fiber points.<\/li>\n\n\n\n<li>Renovation of existing old equipment.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Its products mainly include<\/strong>\uff1a<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cablefam.com\/wp-content\/uploads\/OM2-fiber-cable1-300x300.jpg\" alt=\"OS2 LC TO LC DUPLEX 1\" style=\"object-fit:cover\" title=\"\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cablefam.com\/ja\/product\/lc-upc-to-lc-upc-switchable-uniboot-duplex-os2-single-mode-lszh-2-0mm-fiber-optic-patch-cable.html\"><a href=\"https:\/\/cablefam.com\/ja\/product\/om3-multimode-duplex-sc-upc-to-sc-upc-ofnp-fiber-cable.html\"><a href=\"https:\/\/cablefam.com\/ja\/product\/duplex-om2-multimode-lc-upc-to-st-upc-pvc-ofnr-fiber-optic-cable.html\">\u30c7\u30e5\u30d7\u30ec\u30c3\u30af\u30b9 OM2 \u30de\u30eb\u30c1\u30e2\u30fc\u30c9 LC UPC - ST UPC PVC (OFNR) \u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u30b1\u30fc\u30d6\u30eb<\/a><\/a><\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cablefam.com\/wp-content\/uploads\/imgi_61_p918762-640x640-1m-3ft-duplex-os2-single-mode-lc-apc-to-st-apc-pvc-ofnr-fiber-optic-cable-300x300.jpg\" alt=\"\" title=\"\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cablefam.com\/ja\/product\/lc-apc-duplex-os2-single-mode-lszh-2-0mm-fiber-optic-patch-cable.html\"><a href=\"https:\/\/cablefam.com\/ja\/product\/simplex-os2-single-mode-sc-apc-to-sc-apc-pvc-ofnr-fiber-optic-cable.html\"><a href=\"https:\/\/cablefam.com\/ja\/product\/duplex-os2-single-mode-lc-apc-to-st-apc-pvc-ofnr-fiber-optic-cable.html\">Duplex OS2 Single Mode LC APC to ST APC PVC (OFNR) Fiber Optic Cable<\/a><\/a><\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">FC Connector (Round Threaded)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Structure<\/strong>: Round with threaded nut, fixed by screwing tightly.<\/li>\n\n\n\n<li><strong>Features<\/strong>: Excellent vibration resistance, stable connection, good dustproof and anti-loosening performance; slow wiring and large size.<\/li>\n\n\n\n<li><strong>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/strong>:\n<ol class=\"wp-block-list\">\n<li>Telecom room ODF patch panels and backbone trunk transmission.<\/li>\n\n\n\n<li>Base stations, microwave communication and outdoor high-vibration environments.<\/li>\n\n\n\n<li>Fiber optic test instruments and precision communication devices.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Its products mainly include<\/strong>\uff1a<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-794e3cfa wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cablefam.com\/wp-content\/uploads\/OM2-Multimode1-1-300x300.jpg\" alt=\"OS2 LC TO LC DUPLEX 1\" style=\"object-fit:cover\" title=\"\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cablefam.com\/ja\/product\/lc-upc-to-lc-upc-switchable-uniboot-duplex-os2-single-mode-lszh-2-0mm-fiber-optic-patch-cable.html\"><a href=\"https:\/\/cablefam.com\/ja\/product\/om3-multimode-duplex-sc-upc-to-sc-upc-ofnp-fiber-cable.html\"><a href=\"https:\/\/cablefam.com\/ja\/product\/sc-lc-fc-st-optical-fiber-patch-cable-50-125%ce%bcm-upc-to-upc-duplex-om2-multimode-lszh-ofnr-3-0mm-fiber-optic-patch-cord.html\">SC LC FC ST Optical Fiber Patch Cable 50\/125\u03bcm UPC to UPC Duplex OM2 Multimode LSZH (OFNR) 3.0mm<\/a><\/a><\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"padding-right:var(--wp--preset--spacing--30);padding-left:var(--wp--preset--spacing--30)\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cablefam.com\/wp-content\/uploads\/fiber-cable-1-300x300.jpg\" alt=\"\" title=\"\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cablefam.com\/ja\/product\/lc-apc-duplex-os2-single-mode-lszh-2-0mm-fiber-optic-patch-cable.html\"><a href=\"https:\/\/cablefam.com\/ja\/product\/simplex-os2-single-mode-sc-apc-to-sc-apc-pvc-ofnr-fiber-optic-cable.html\"><a href=\"https:\/\/cablefam.com\/ja\/product\/sc-lc-fc-st-os2-switchable-optical-fiber-patch-cable-duplex-omultimode-lszh-ofnr-3-0mm-fiber-optic-patch-cord.html\">SC LC FC ST OS2 Switchable Optical Fiber Patch Cable Duplex Multimode LSZH (OFNR) 3.0mm Fiber Optic<\/a><\/a><\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">3. Key Differences Summary<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Ferrule<\/strong>: LC is 1.25mm; SC\/ST\/FC are all 2.5mm.<\/li>\n\n\n\n<li><strong>Connection Method<\/strong>:\n<ul class=\"wp-block-list\">\n<li>LC \/ SC: <strong>Direct plug and play<\/strong>, fastest operation.<\/li>\n\n\n\n<li>ST: <strong>Twist to lock<\/strong>.<\/li>\n\n\n\n<li>FC: <strong>Screw tight<\/strong>, most stable but slowest.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Density Ranking<\/strong>: LC &gt; SC &gt; ST &gt; FC<\/li>\n\n\n\n<li><strong>Vibration Resistance Ranking<\/strong>: FC &gt; ST &gt; SC &gt; LC<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">4. Selection Guide<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Data center high-speed, optical module, high density \u2192 <strong>Choose LC<\/strong><\/li>\n\n\n\n<li>Home broadband, optical modem, general office networking \u2192 <strong>Choose SC<\/strong><\/li>\n\n\n\n<li>Legacy equipment, old campus surveillance \u2192 <strong>Choose ST<\/strong><\/li>\n\n\n\n<li>Room patch panel, base station, precision testing, trunk line \u2192 <strong>Choose FC<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Supplement<\/strong>: All four connectors have <strong>UPC (Blue)<\/strong> \/ <strong>APC (Green)<\/strong> end types, <strong>do not mix connections<\/strong>.<\/p>","protected":false},"excerpt":{"rendered":"<p>1. Core Parameter Overview Connector Shape Ferrule Diameter Locking Method Port Density Main Application LC Small square 1.25mm Snap latch Highest Data centers, optical modules, high-density cabling SC Large square 2.5mm Push-in lock Medium Home broadband, PON, ordinary LAN ST Round bayonet 2.5mm Twist bayonet Low Old campus networks, surveillance, legacy building wiring FC Round threaded 2.5mm Screw fastening Lowest ODF racks, base stations, precision instruments, long-distance trunk lines 2. Detailed Introduction &amp; Application LC Connector (Small Square) Its products mainly include\uff1a LC UPC to LC UPC Switchable Uniboot Duplex OS2 Single Mode LSZH 2.0mm Fiber Optic Patch Cable LC APC Duplex OS2 Single Mode LSZH 2.0mm Fiber Optic Patch [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":10444,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[1382,1379,1380,1381],"class_list":["post-10588","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guides-tutorials","tag-fc-fiber","tag-lc-fiber","tag-sc-fiber","tag-st-fiber"],"_links":{"self":[{"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/posts\/10588","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/comments?post=10588"}],"version-history":[{"count":2,"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/posts\/10588\/revisions"}],"predecessor-version":[{"id":10598,"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/posts\/10588\/revisions\/10598"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/media\/10444"}],"wp:attachment":[{"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/media?parent=10588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/categories?post=10588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cablefam.com\/ja\/wp-json\/wp\/v2\/tags?post=10588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}