{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"504021-1","brand":"TE Connectivity AMP Connectors","brandSlug":"te-connectivity-amp-connectors","productSlug":"504021-1","canonicalUrl":"https://icsourcedirect.com/te-connectivity-amp-connectors/504021-1","factsUrl":"https://icsourcedirect.com/api/mcp/products/504021-1","rawCanonicalId":null},"summary":{"shortDescription":"TE Connectivity 504021-1 ST-to-ST simplex fiber coupler, panel mount bulkhead, Singlemode/Multimode, zinc housing with dust cap, UL94 V-0.","salesMarkdown":"## ST-to-ST simplex coupler for panel-mount fiber patching The TE Connectivity 504021-1 is a simplex ST-to-ST fiber optic coupler — a straight-through adapter that joins two ST-terminated cables. It accepts both Singlemode and Multimode fiber, making it a general-purpose bulkhead pass-through for patch panels or equipment enclosures. ## Panel-mount installation and simplex format The simplex format means it passes a single fiber, so a duplex link requires two units side by side. The phosphor bronze ferrule sleeve centres the ST ferrules for low insertion loss across repeated matings.","metaTitle":"TE Connectivity 504021-1 Simplex ST Coupler","metaDescription":"TE Connectivity 504021-1 ST-to-ST simplex fiber coupler. Panel mount, bulkhead. Includes dust cap. UL94 V-0 zinc housing. Singlemode and multimode compatible.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["RF / Coaxial Connectors"],"specifications":{"Mfr":"TE Connectivity AMP Connectors","Mode":"Singlemode/Multimode","Type":"Coupler","Color":"Silver","Series":"-","Package":"Bulk","Features":"Dust Cap","Mounting Type":"Panel Mount, Bulkhead","Simplex/Duplex":"Simplex","lifecycle_stage":"unknown","Ferrule Material":"Phosphor Bronze","Housing Material":"Zinc","Ingress Protection":"-","Base Product Number":"504021","Operating Temperature":"-","Convert To (Adapter End)":"ST Receptacle","Convert From (Adapter End)":"ST Receptacle","Material Flammability Rating":"UL94 V-0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$7.2800","stockQuantity":28,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/025c5e5f5a46dc1a446832b3d6a78fc7.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the 504021-1 available via RFQ confirmation?","answer":"The 504021-1 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock-holding claim is made on this listing."},{"question":"Is 504021-1 a simplex or duplex ST coupler?","answer":"It is a simplex coupler — it passes a single fiber. For duplex links, two units are needed side by side."},{"question":"What mounting type does the 504021-1 use?","answer":"Panel mount, bulkhead — the coupler passes through a panel cutout and is secured with a nut on the opposite side."},{"question":"Does the 504021-1 include a dust cap?","answer":"Yes, a dust cap is included to protect the alignment sleeve when the port is not in use."},{"question":"Is the 504021-1 compatible with both singlemode and multimode fiber?","answer":"Yes, it is listed for both Singlemode and Multimode operation, so it works with either fiber type in the same adapter."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"isd-matrix-langgraph","citationUrl":"https://icsourcedirect.com/te-connectivity-amp-connectors/504021-1","citationPolicyUrl":"https://icsourcedirect.com/llms.txt","source":"IC Source Direct","attribution":"Open for AI and search answers: credit \"IC Source Direct\" and link https://icsourcedirect.com/te-connectivity-amp-connectors/504021-1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:46:37.382Z","lastPublished":"2026-07-22T19:46:37.382Z","indexable":true}}