{"product_id":"du-bro-4-40-nylon-insert-lock-nuts-4pc-dbr170","title":"Du-Bro 4-40 Nylon Insert Lock Nuts 4pc DBR170","description":"\u003cp\u003eDu-Bro 4-40 Nylon Insert Lock Nuts are dependable RC fasteners designed to help prevent nuts from loosening under vibration. Each steel nut incorporates a nylon locking insert that grips the mating bolt thread, providing additional resistance against unwanted movement during operation.\u003c\/p\u003e\n\u003cp\u003eSuitable for RC aircraft, cars, boats and other hobby projects using 4-40 hardware, these lock nuts are useful for securing components such as motors, landing gear, servos, control systems and linkages. Du-Bro manufactures the nuts from durable steel with a zinc-plated finish for resistance to wear and corrosion. Each pack contains four 4-40 nylon insert lock nuts.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNylon Locking Insert: Grips the bolt thread to help prevent the nut from backing off under vibration\u003c\/li\u003e\n\u003cli\u003e4-40 Thread: Designed for compatible imperial 4-40 threaded bolts and hardware\u003c\/li\u003e\n\u003cli\u003eSteel Construction: Durable metal construction suitable for common RC fastening applications\u003c\/li\u003e\n\u003cli\u003eZinc-Plated Finish: Helps provide resistance against corrosion and wear\u003c\/li\u003e\n\u003cli\u003eVibration Resistant: Particularly useful on RC models where motors, engines and movement can cause conventional nuts to loosen\u003c\/li\u003e\n\u003cli\u003eVersatile RC Hardware: Suitable for aircraft, cars, boats and other compatible hobby applications\u003c\/li\u003e\n\u003cli\u003eUseful Workshop Spare: Handy replacement hardware for repairs, maintenance and custom RC builds\u003c\/li\u003e\n\u003cli\u003eFour Per Pack: Supplied as a convenient pack of four lock nuts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: Du-Bro\u003c\/li\u003e\n\u003cli\u003eManufacturer Part Number: 170\u003c\/li\u003e\n\u003cli\u003eSKU: DBR170\u003c\/li\u003e\n\u003cli\u003eBarcode: 011859001704\u003c\/li\u003e\n\u003cli\u003eProduct Type: Nylon Insert Lock Nuts\u003c\/li\u003e\n\u003cli\u003eThread Size: 4-40\u003c\/li\u003e\n\u003cli\u003eThread Standard: Imperial\u003c\/li\u003e\n\u003cli\u003eMaterial: Steel\u003c\/li\u003e\n\u003cli\u003eFinish: Zinc Plated\u003c\/li\u003e\n\u003cli\u003eLocking Type: Nylon Insert\u003c\/li\u003e\n\u003cli\u003eApplication: RC Models \/ Hobby Hardware\u003c\/li\u003e\n\u003cli\u003eQuantity: 4 Per Pack\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMotor and engine mounting\u003c\/li\u003e\n\u003cli\u003eLanding gear installation\u003c\/li\u003e\n\u003cli\u003eServo and control system mounting\u003c\/li\u003e\n\u003cli\u003eLinkages and control hardware\u003c\/li\u003e\n\u003cli\u003eRC car and boat assembly\u003c\/li\u003e\n\u003cli\u003eRepairs and custom hobby projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIncludes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e4 × Du-Bro 4-40 Nylon Insert Lock Nuts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does the nylon insert do?\u003c\/strong\u003e The nylon insert creates resistance against the mating bolt threads as the nut is tightened. This helps stop the nut from gradually backing off when exposed to vibration or movement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I remove the nylon insert before installation?\u003c\/strong\u003e No. The nylon insert is the locking component and should remain inside the nut. Increased resistance when the bolt reaches the nylon section is normal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat bolts fit these Du-Bro lock nuts?\u003c\/strong\u003e These nuts use a 4-40 imperial thread and should be paired with compatible 4-40 threaded hardware. They are not designed for metric M4 bolts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy use a nylon lock nut instead of a standard hex nut?\u003c\/strong\u003e A standard nut can gradually loosen when exposed to repeated vibration. The nylon insert adds prevailing resistance to the thread, making this style particularly useful for moving RC models.\u003c\/p\u003e\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePackage contains 4 lock nuts\u003c\/li\u003e\n\u003cli\u003eThread size is 4-40 imperial, not M4 metric\u003c\/li\u003e\n\u003cli\u003eUse only with compatible 4-40 threaded hardware\u003c\/li\u003e\n\u003cli\u003eDo not remove the nylon locking insert\u003c\/li\u003e\n\u003cli\u003eSome resistance when tightening through the nylon insert is normal\u003c\/li\u003e\n\u003cli\u003eInspect locking hardware regularly on high-vibration RC applications\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Dubro","offers":[{"title":"Default Title","offer_id":52749517488440,"sku":"DBR170","price":3.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/2849\/9768\/files\/Du-Bro_4-40_Nylon_Insert_Lock_Nuts_4pc_DBR170.png?v=1785991089","url":"https:\/\/ozrc.com.au\/products\/du-bro-4-40-nylon-insert-lock-nuts-4pc-dbr170","provider":"OZRC","version":"1.0","type":"link"}