{"product_id":"gold-plated-bullet-banana-connectors-2-8mm-pure-copper-rc-brushless-motor-esc-40pcs","title":"Gold-Plated Bullet Banana Connectors – 2\/3.5\/4\/5\/5.5\/6\/8mm Pure Copper Plug Set for RC Brushless Motor \u0026 ESC Wiring, 40pcs","description":"\u003ch2\u003eGold-Plated Bullet Banana Connectors – 2–8mm Pure Copper for RC Brushless Motor \u0026amp; ESC Wiring\u003c\/h2\u003e\n\n\u003cp\u003ePure copper, gold-plated bullet (banana) connectors for RC brushless motor and ESC (Electronic Speed Controller) wiring. The bullet connector is the universal standard for RC motor phase connections — the cylindrical male bullet inserts into the female socket, providing a low-resistance, high-current connection that can be quickly disconnected for motor or ESC replacement. Gold plating on pure copper provides the lowest possible contact resistance — critical for high-current RC applications where connector resistance directly affects motor efficiency and heat generation.\u003c\/p\u003e\n\n\u003ch3\u003eSize Selection Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2mm:\u003c\/strong\u003e For micro and nano RC aircraft. Current capacity: ~10A. For motors below 100W.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3.5mm:\u003c\/strong\u003e The most common size for mini and small RC aircraft (250–450 class). Current capacity: ~30A. For motors 100–500W.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4mm:\u003c\/strong\u003e For medium RC aircraft and cars (450–550 class). Current capacity: ~40A. For motors 300–1000W.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5mm:\u003c\/strong\u003e For large RC aircraft and high-power cars. Current capacity: ~60A. For motors 500–2000W.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5.5mm:\u003c\/strong\u003e For high-power RC applications. Current capacity: ~70A.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e6mm:\u003c\/strong\u003e For large RC aircraft, boats, and cars with high-current motors. Current capacity: ~80A.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e8mm:\u003c\/strong\u003e For very high-power RC applications and electric vehicle motor connections. Current capacity: ~120A.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Pure copper (C11000), gold-plated (24K, 0.5–1.0μm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSizes Available:\u003c\/strong\u003e 2mm, 3.5mm, 4mm, 5mm, 5.5mm, 6mm, 8mm (select above)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTermination:\u003c\/strong\u003e Solder type (hollow bullet for solder fill)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 40 pieces (20 male + 20 female)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eHow do I solder bullet connectors?\u003c\/h4\u003e\n\u003cp\u003e1. Tin the wire end with solder. 2. Fill the hollow bullet connector cup with solder — heat the connector body (not the solder) until the solder flows freely into the cup. 3. Insert the tinned wire into the solder-filled cup while the solder is still liquid. 4. Hold still for 10–15 seconds until the solder solidifies. 5. Apply heat-shrink tubing over the solder joint. Key points: use a high-wattage iron (60–80W) — the copper bullet is a large heat sink and a low-wattage iron will not heat it sufficiently. Use 60\/40 or 63\/37 solder for best flow. Do not move the wire while the solder is solidifying — movement creates a cold joint.\u003c\/p\u003e\n\n\u003ch4\u003eWhat is the difference between 3.5mm and 4mm bullet connectors?\u003c\/h4\u003e\n\u003cp\u003e3.5mm bullets are rated for approximately 30A continuous; 4mm bullets for approximately 40A continuous. For RC aircraft, 3.5mm is standard for 3S–4S LiPo systems with motors drawing up to 30A. 4mm is standard for 4S–6S systems with motors drawing 30–40A. When in doubt, use the larger size — a 4mm connector on a 3.5mm application adds negligible weight and provides headroom for future motor upgrades.\u003c\/p\u003e\n\n\u003ch4\u003eWhy use pure copper instead of brass for bullet connectors?\u003c\/h4\u003e\n\u003cp\u003ePure copper has approximately 3× lower electrical resistivity than brass (1.7 μΩ·cm vs 6–7 μΩ·cm). In high-current RC applications, lower connector resistance means less voltage drop across the connector, less heat generation, and more power delivered to the motor. For a motor drawing 50A, a 1mΩ connector resistance difference results in 2.5W of additional heat generation per connector pair — significant in a weight-sensitive RC application.\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to insulate bullet connectors?\u003c\/h4\u003e\n\u003cp\u003eYes. Bare bullet connectors on motor phase wires can short against each other or against the frame if they touch. Apply heat-shrink tubing over each connector after soldering — leave only the mating end exposed. For battery connections (positive and negative), use different-colored heat-shrink (red for positive, black for negative) to prevent polarity reversal.\u003c\/p\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRC aircraft:\u003c\/strong\u003e Brushless motor phase connections (3-phase: 3 bullet connectors per motor-ESC pair)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRC cars \u0026amp; trucks:\u003c\/strong\u003e Motor-to-ESC connections on brushless RC vehicles\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRC boats:\u003c\/strong\u003e Waterproof motor connections (with heat-shrink insulation)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLiPo batteries:\u003c\/strong\u003e Battery-to-ESC power connections (with appropriate current rating)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectric vehicles:\u003c\/strong\u003e Low-voltage motor phase connections on small EVs and e-bikes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cp\u003e40 pieces — 20 male bullet connectors + 20 female bullet connectors (size as selected above).\u003c\/p\u003e","brand":"Cable Parts Online","offers":[{"title":"2mm Male \/ 40 pcs","offer_id":47850626416885,"sku":"14:200004889#2mm Male;200001249:202408830#40 pcs","price":23.17,"currency_code":"USD","in_stock":true},{"title":"2mm Female \/ 40 pcs","offer_id":47850626384117,"sku":"14:200004890#2mm Female;200001249:202408830#40 pcs","price":20.02,"currency_code":"USD","in_stock":true},{"title":"3mm Male \/ 40 pcs","offer_id":47850626351349,"sku":"14:200004891#3mm Male;200001249:202408830#40 pcs","price":23.17,"currency_code":"USD","in_stock":true},{"title":"3mm Female \/ 40 pcs","offer_id":47850626547957,"sku":"14:200003699#3mm Female;200001249:202408830#40 pcs","price":23.59,"currency_code":"USD","in_stock":true},{"title":"3.5mm Male \/ 40 pcs","offer_id":47850626515189,"sku":"14:200002130#3.5mm Male;200001249:202408830#40 pcs","price":25.13,"currency_code":"USD","in_stock":true},{"title":"3.5mm Female \/ 40 pcs","offer_id":47850626482421,"sku":"14:365458#3.5mm Female;200001249:202408830#40 pcs","price":20.83,"currency_code":"USD","in_stock":true},{"title":"4mm Male \/ 40 pcs","offer_id":47850626449653,"sku":"14:350850#4mm Male;200001249:202408830#40 pcs","price":31.05,"currency_code":"USD","in_stock":true},{"title":"4mm Female \/ 40 pcs","offer_id":47850626679029,"sku":"14:350852#4mm Female;200001249:202408830#40 pcs","price":23.17,"currency_code":"USD","in_stock":true},{"title":"5mm Male \/ 40 pcs","offer_id":47850626646261,"sku":"14:350853#5mm Male;200001249:202408830#40 pcs","price":46.34,"currency_code":"USD","in_stock":true},{"title":"5mm Female \/ 40 pcs","offer_id":47850626613493,"sku":"14:10#5mm Female;200001249:202408830#40 pcs","price":46.34,"currency_code":"USD","in_stock":true},{"title":"5.5mm Male \/ 40 pcs","offer_id":47850626580725,"sku":"14:29#5.5mm Male;200001249:202408830#40 pcs","price":46.34,"currency_code":"USD","in_stock":true},{"title":"5.5mm Female \/ 40 pcs","offer_id":47850626220277,"sku":"14:173#5.5mm Female;200001249:202408830#40 pcs","price":46.34,"currency_code":"USD","in_stock":true},{"title":"6mm Male \/ 40 pcs","offer_id":47850626187509,"sku":"14:175#6mm Male;200001249:202408830#40 pcs","price":46.34,"currency_code":"USD","in_stock":true},{"title":"6mm Female \/ 40 pcs","offer_id":47850626154741,"sku":"14:193#6mm Female;200001249:202408830#40 pcs","price":46.34,"currency_code":"USD","in_stock":true},{"title":"6.5mm Male \/ 40 pcs","offer_id":47850626121973,"sku":"14:366#6.5mm Male;200001249:202408830#40 pcs","price":86.42,"currency_code":"USD","in_stock":true},{"title":"6.5mm Female \/ 40 pcs","offer_id":47850626318581,"sku":"14:496#6.5mm Female;200001249:202408830#40 pcs","price":86.42,"currency_code":"USD","in_stock":true},{"title":"8mm Male \/ 40 pcs","offer_id":47850626285813,"sku":"14:691#8mm Male;200001249:202408830#40 pcs","price":81.69,"currency_code":"USD","in_stock":true},{"title":"8mm Female \/ 40 pcs","offer_id":47850626253045,"sku":"14:771#8mm Female;200001249:202408830#40 pcs","price":81.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0732\/3494\/0149\/files\/Sf9bd8dc7fd984d9db2a845be1bcc584bX.webp?v=1773899397","url":"https:\/\/www.csldmcml.com\/products\/gold-plated-bullet-banana-connectors-2-8mm-pure-copper-rc-brushless-motor-esc-40pcs","provider":"Cable Parts Online","version":"1.0","type":"link"}