{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1731120300","brand":"Molex","brandSlug":"molex","productSlug":"1731120300","canonicalUrl":"https://icsourcedirect.com/molex/1731120300","factsUrl":"https://icsourcedirect.com/api/mcp/products/1731120300","rawCanonicalId":null},"summary":{"shortDescription":"Molex FEK, FCT 173112 series threaded block insert, 4-40 UNC thread, latch block accessory for D-sub backshells, bulk package.","salesMarkdown":"The Molex 1731120300 is a threaded block insert from the FEK, FCT 173112 series, designed as a latch block accessory for D-sub backshells. It carries a 4-40 UNC thread — the standard jack-screw size used across the D-subminiature connector family to secure the backshell to the connector body. This isn't a connector itself; it's the threaded insert that gives the backshell its captive screw, letting you tighten down the cable exit without the nut spinning loose inside the assembly. ## Thread Size and Physical Fit The defining spec here is the 4-40 thread — a #4 screw with 40 threads per inch, the same thread used on standard D-sub jackscrews. That means this insert fits any D-sub backshell that accepts a 4-40 threaded block, which covers the vast majority of standard-density D-sub backshells on the market. If you're replacing a lost or stripped insert on an existing assembly, the 4-40 thread confirms it's a drop-in swap without re-tapping the backshell.","metaTitle":"Molex 1731120300 FEK FCT Threaded Block Insert, 4-40","metaDescription":"Molex 1731120300 FEK FCT threaded block insert, 4-40 UNC thread. Latch block accessory for D-sub backshells. RoHS3 compliant, active production.","metaKeywords":null},"attributes":{"series":"FEK, FCT 173112","packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":["D-Sub & D-Shaped Connectors"],"specifications":{"Mfr":"Molex","Series":"FEK, FCT 173112","Package":"Bulk","Features":"4-40","Accessory Type":"Latch Block","Product Status":"Active","lifecycle_stage":"unknown","Base Product Number":"173112","Number of Positions":"-","For Use With/Related Products":"D-Sub Backshell"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.7200","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.72000","currency":"USD"},{"qty":10,"price":"$0.60300","currency":"USD"},{"qty":100,"price":"$0.46940","currency":"USD"},{"qty":1000,"price":"$0.36880","currency":"USD"},{"qty":2500,"price":"$0.33527","currency":"USD"}]},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the thread size of Molex 1731120300?","answer":"The thread size is 4-40 UNC — a #4 screw with 40 threads per inch, matching standard D-sub jackscrew threads."},{"question":"Is 1731120300 RoHS compliant?","answer":"Yes, it is ROHS3 Compliant per the manufacturer's listing."},{"question":"Is 1731120300 compatible with any D-sub backshell?","answer":"It is designed for use with D-sub backshells that accept a 4-40 threaded block insert — the standard thread for most D-sub backshells."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/molex/1731120300","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/1731120300 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}}