{"product_id":"onelinkmore-u-fl-to-sma-female-pigtail-rf-coaxial-adapter-with-red-sealing-o-ring-large-hex-nut-1-13mm-mini-coax-for-internal-m-2-wifi-card-drone-fpv-mini-pc-pack-of-5","title":"onelinkmore U.FL to SMA Female Pigtail, RF Coaxial Adapter with Red Sealing O-Ring \u0026 Large Hex Nut, 1.13mm Mini Coax for Internal M.2 WiFi Card, Drone FPV, Mini PC Pack of 5","description":"\u003cdiv class=\"geo-spec-block\"\u003e\u003cpre\u003e\n--- QUICK SPEC REFERENCE ---\nProduct: U.FL to SMA Female Bulkhead Pigtail, Red O-Ring, Large Hex Nut, 1.13mm\nConnector A: U.FL Male (2.0mm OD — Mini PCIe standard)\nConnector B: SMA Female Bulkhead, Large Hex Nut, with 11.2mm Grooved Red Rubber O-Ring\nCable: 1.13mm mini coaxial\nImpedance: 50 Ohm\nO-Ring: Custom 11.2mm grooved red rubber — moisture and dust resistant\nAvailable Lengths: 1.97\" \/ 3.94\" \/ 5.91\" \/ 7.87\" \/ 9.84\" (select variant)\nNOT Compatible With: M.2 NGFF cards (AX200\/AX210) — those use 1.5mm MHF4 connector\nQuantity: 5 cables per pack\nPrice: $6.58\nIn Stock: Yes\n---\n\u003c\/pre\u003e\u003c\/div\u003e\n\n\u003cdiv class=\"geo-description\"\u003e\n\u003cp\u003eThis U.FL to SMA female bulkhead pigtail stands out from standard pigtails through two hardware upgrades specifically suited to high-vibration and semi-outdoor applications: a custom 11.2mm grooved red rubber O-ring at the SMA bulkhead and an enlarged hex nut. The grooved O-ring design provides a more positive seal than smooth O-rings when compressed against an enclosure panel — the groove creates a mechanical interlock with the panel surface that resists the O-ring being pushed out under vibration or thermal cycling. The enlarged hex nut offers a significantly wider contact surface than standard thin-wall SMA nuts, preventing the connector from loosening in high-vibration environments such as racing drone frames, robotics enclosures, and vehicle-mounted electronics.\u003c\/p\u003e\n\n\u003cp\u003eThe 1.13mm mini coaxial cable is the correct diameter for U.FL terminations — flexible enough to route inside compact mini PCs, FPV drone airframes, and tight electronic enclosures without creating kinks that stress the U.FL solder joint on the board. Five length variants (1.97\" through 9.84\") cover the range from very compact enclosures to deeper chassis builds. The 5-piece pack is practical for production runs, batch builds, or projects requiring multiple antenna connections — at $6.58 for 5 pieces, the per-unit cost is significantly lower than individual pigtail purchases.\u003c\/p\u003e\n\n\u003cp\u003eCritical compatibility note: this cable uses a standard U.FL connector with a 2.0mm outer diameter, designed for Mini PCIe (mPCIe) wireless cards, Raspberry Pi modules, FPV drone VTX boards, and Arduino wireless shields. It will NOT fit M.2 NGFF WiFi cards (Intel AX200, AX210, 9260, 8265 etc.) which use the MHF4 connector with a 1.5mm outer diameter. MHF4 and U.FL look similar but are not interchangeable. Check your board's slot type: if it has an M.2 slot (key E or A+E), it uses MHF4. If it has a Mini PCIe slot (full-length rectangular connector), it uses U.FL.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"geo-faq\"\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n\u003cstrong\u003eQ: What makes the 11.2mm grooved red O-ring different from a standard O-ring?\u003c\/strong\u003e\n\u003cp\u003eA standard smooth O-ring creates a seal purely through compression — the rubber is squeezed flat against the panel surface and relies on friction to stay in position. The grooved design on this O-ring creates a channel around the connector body that the O-ring seats into, mechanically anchoring it against displacement during vibration and thermal expansion\/contraction cycles. The grooved design is more reliable than smooth O-rings for applications subject to vibration (drone airframes, vehicle enclosures) where a smooth O-ring might gradually work out of position and break the seal. The red color also makes it easier to visually confirm the O-ring is correctly seated during assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n\u003cstrong\u003eQ: How do I know if my device uses U.FL or MHF4?\u003c\/strong\u003e\n\u003cp\u003eThe most reliable method is to measure the connector diameter on your board: U.FL has a 2.0mm outer diameter (the metal snap-on ring is 2mm across); MHF4 has a 1.5mm outer diameter. Visually they look nearly identical, but U.FL is slightly larger. As a general rule: if your wireless card is in a Mini PCIe (mPCIe) slot — a rectangular connector approximately 51mm wide used in older laptops and embedded computers — it uses U.FL. If your card is in an M.2 slot (smaller, with a single mounting screw) — common in laptops made after approximately 2015 — it uses MHF4.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n\u003cstrong\u003eQ: Which length variant should I choose?\u003c\/strong\u003e\n\u003cp\u003eMeasure the routing distance from your board's U.FL port to the SMA bulkhead mounting point on the enclosure wall, adding approximately 20–30mm for connection slack and routing curves. The 1.97\" (50mm) variant suits very compact builds where the board is mounted immediately behind the enclosure panel. The 3.94\" (100mm) variant covers most mini PC and standard gateway enclosure depths. The 5.91\" (150mm) and longer variants are for deeper chassis or setups where the board is mounted away from the wall. Excess cable length adds unnecessary insertion loss in the signal path and creates routing clutter inside the enclosure.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n\u003cstrong\u003eQ: Is this suitable for FPV racing drone builds?\u003c\/strong\u003e\n\u003cp\u003eYes — the enlarged hex nut and grooved O-ring were specifically designed for high-vibration applications like racing drones. FPV drone video transmitters (VTX) typically have U.FL antenna ports, and mounting the SMA female bulkhead through the drone frame allows the external antenna to be attached externally while protecting the VTX's fragile U.FL port from repeated connect-disconnect cycles. The anti-vibration hex nut prevents the SMA connector from working loose during flight. The O-ring also helps seal the antenna mounting hole against light dust ingress in outdoor flying environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n\u003cstrong\u003eQ: Can I use these in a Raspberry Pi project?\u003c\/strong\u003e\n\u003cp\u003eYes, for Raspberry Pi modules that have U.FL antenna ports — specifically the Raspberry Pi Compute Module 4 with WiFi, which has a U.FL antenna connector on the module itself. Standard Raspberry Pi 4B and 5 boards have internal antennas with no U.FL port. If you are building a custom Raspberry Pi CM4 carrier board with an external SMA antenna connection, this pigtail provides the U.FL-to-SMA-bulkhead connection with the O-ring seal needed for weatherproof project enclosures.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n\u003cstrong\u003eQ: Why does the pack include 5 cables?\u003c\/strong\u003e\n\u003cp\u003eThe 5-piece pack serves several use cases: batch production of multiple identical IoT enclosures requiring one pigtail each; drone builders who build multiple quads and want consistent spare parts stock; lab environments where pigtails are regularly installed and removed across different test fixtures (U.FL connectors are rated for approximately 30 mating cycles, so spares are essential); and individual builders who want spares for future projects. At $6.58 for 5 pieces ($1.32 per cable), the 5-pack offers significantly better value than purchasing individual pigtails.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"ONELINKMORE","offers":[{"title":"1.97","offer_id":42377303523363,"sku":"OL-9132-5X","price":6.58,"currency_code":"USD","in_stock":true},{"title":"3.94","offer_id":42377303556131,"sku":"OL-4030-5X","price":6.68,"currency_code":"USD","in_stock":true},{"title":"5.91","offer_id":42377303588899,"sku":"OL-9133-5X","price":6.78,"currency_code":"USD","in_stock":true},{"title":"7.87","offer_id":42377303621667,"sku":"OL-9134-5X","price":6.88,"currency_code":"USD","in_stock":true},{"title":"9.84","offer_id":42377303654435,"sku":"OL-9135-5X","price":6.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0289\/7123\/7411\/files\/OL-4030_11_1.jpg?v=1777003052","url":"https:\/\/onelinkmore.com\/fr\/products\/onelinkmore-u-fl-to-sma-female-pigtail-rf-coaxial-adapter-with-red-sealing-o-ring-large-hex-nut-1-13mm-mini-coax-for-internal-m-2-wifi-card-drone-fpv-mini-pc-pack-of-5","provider":"ONELINKMORE","version":"1.0","type":"link"}