{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"31-221","brand":"Amphenol","brandSlug":"amphenol","productSlug":"31-221","canonicalUrl":"https://icsourcedirect.com/amphenol/31-221","factsUrl":"https://icsourcedirect.com/api/mcp/products/31-221","rawCanonicalId":null},"summary":{"shortDescription":"Amphenol RF BNC jack, female socket, 50 Ohm, 4 GHz, 500 V, panel mount bulkhead, solder cup, nickel body, silver-plated beryllium copper center contact, includes lockwasher and nut.","salesMarkdown":"The 31-221: It's the fixed half of a standard BNC quick-connect pair — mates with any male BNC plug using the bayonet lock. The extended PTFE insulation and 500 V rating push this beyond a typical 50 Ohm signal connector; it's sized for applications where voltage standoff matters as much as signal integrity, like test equipment panels, RF distribution boxes, or broadcast gear where a 4 GHz passband is enough headroom. ## What Ships in the Box and How It Mounts No separate hardware order needed for a standard panel install. The bulkhead flange seats against the outside of the panel; the lockwasher and nut tighten from the rear side. That means you need rear-panel access for assembly, but the nut provides solid mechanical retention and a ground bond through the nickel-plated brass body. ## Termination and Contact Construction The silver plating on the center contact keeps solderability clean and contact resistance low over 500 mating cycles. Beryllium copper gives the socket fingers enough spring memory to hold grip through those 500 cycles without taking a set.","metaTitle":"Amphenol 31-221 BNC Jack, 50 Ohm, 4 GHz, Panel Mount","metaDescription":"Amphenol 31-221 BNC jack, female socket, 50 Ohm, 4 GHz, 500 V, silver-plated beryllium copper contact, nickel body, includes lockwasher & nut.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["RF / Coaxial Connectors","RF Cable Assemblies"],"specifications":{"Mfr":"Amphenol RF","Series":"-","Package":"Bulk","Features":"Extended Insulation","Includes":"3 pcs - 1 Connector, 1 Lockwasher, 1 Nut","Impedance":"50Ohm","Body Finish":"Nickel","Cable Group":"-","Body Material":"Brass","Housing Color":"Silver","Mating Cycles":"500","Mounting Type":"Panel Mount","Connector Type":"Jack, Female Socket","Fastening Type":"Bayonet Lock","Insertion Loss":"0.2dB","Product Status":"Active","Voltage Rating":"500 V","Connector Style":"BNC","Frequency - Max":"4 GHz","Number of Ports":"1","lifecycle_stage":"unknown","Mounting Feature":"Bulkhead - Rear Side Nut","Ingress Protection":"-","Shield Termination":"Solder","Base Product Number":"31-221","Contact Termination":"Solder Cup","Dielectric Material":"Polytetrafluoroethylene (PTFE)","Operating Temperature":"-65°C~165°C","Center Contact Plating":"Silver","Center Contact Material":"Beryllium Copper"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.7000","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icsourcedirect.com/api/mcp/products/31-221/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the Amphenol 31-221 BNC jack?","answer":"Submit an RFQ for your target quantity and we'll source it."},{"question":"What is the impedance of the Amphenol 31-221?","answer":"This is the standard impedance for RF test, telecom, and broadcast systems — confirm your system impedance matches before specifying."},{"question":"Does the 31-221 come with mounting hardware?","answer":"Yes, the 31-221 includes a lockwasher and a nut as part of the three-piece assembly. No separate hardware order is needed for a standard bulkhead panel mount."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/amphenol/31-221","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/amphenol/31-221 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-23T20:41:44.623Z","lastPublished":"2026-07-23T20:41:44.623Z","indexable":true}}