{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1731120059","brand":"Molex","brandSlug":"molex","productSlug":"1731120059","canonicalUrl":"https://icsourcedirect.com/molex/1731120059","factsUrl":"https://icsourcedirect.com/api/mcp/products/1731120059","rawCanonicalId":null},"summary":{"shortDescription":"Molex FCT 1731120059 jackscrew socket, 4-40 UNC thread, 0.315\" length below head, for D-sub backshells, bulk package.","salesMarkdown":"The Molex 1731120059 is a jackscrew socket from the FCT line, purpose-built for D-sub backshells. It carries a 4-40 UNC thread and a threaded portion below the head measuring 0.315\" (8.00 mm) — the standard length that lets the screw engage the mating receptacle without bottoming out in a typical backshell cavity. This is the hardware that locks the cable-side backshell to the panel-mount D-sub, keeping the assembly tight under vibration and preventing the connector from backing off the mounting flange. ## Thread Size and Fit — What 4-40 Means for Your Assembly It matches the threaded inserts in the mating D-sub receptacle and the clearance holes in most metal or plastic backshells. The 0.315\" threaded length below the head is enough to pass through a standard backshell wall and engage the receptacle threads by several full turns, giving a solid mechanical lock. If your backshell has a thicker wall or a recessed insert, check that the 0.315\" projection still leaves enough thread engagement — it usually does for standard-density shells.","metaTitle":"Molex 1731120059 Jackscrew Socket, 4-40 Thread","metaDescription":"Molex 1731120059 jackscrew socket, 4-40 UNC thread, 0.315\" length below head, for D-sub backshells. Active production, RoHS compliant. Sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"Not applicable","productStatus":"Active","categoryPath":["D-Sub & D-Shaped Connectors"],"specifications":{"Mfr":"Molex","Series":"-","Package":"Bulk","Features":"-","Thread Size":"4-40","Accessory Type":"Jackscrew Socket","Product Status":"Active","lifecycle_stage":"unknown","Base Product Number":"173112","Length - Below Head":"0.315\\\" (8.00mm)","For Use With/Related Products":"D-Sub Backshell","Length - Threaded Portion Below Head":"0.315\\\" (8.00mm)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.0800","priceTiers":[{"qty":1,"price":"$1.08000","currency":"USD"},{"qty":10,"price":"$0.89400","currency":"USD"},{"qty":100,"price":"$0.74520","currency":"USD"},{"qty":1000,"price":"$0.59614","currency":"USD"},{"qty":2500,"price":"$0.54026","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/40973b2749b2189ebdb8024e634e4102.pdf","sourceUrl":null,"alternativesUrl":"https://icsourcedirect.com/api/mcp/products/1731120059/alternatives.json"},"ai":{"faq":[{"question":"What is the thread size of 1731120059?","answer":"The thread size is 4-40 UNC, the standard for D-sub jack-screws. It mates with the threaded inserts in D-sub receptacles and backshells."},{"question":"Is 1731120059 RoHS compliant?","answer":"Yes, the 1731120059 is RoHS compliant."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/molex/1731120059","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/molex/1731120059 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:52:26.615Z","lastPublished":"2026-08-11T15:52:26.615Z","indexable":true}}