{"product_id":"motorola-pmdn4016","title":"Motorola PMDN4016AR Volume Potentiometer and Nut for Mag One BPR40","description":"\u003ch2\u003eReplacement Volume Potentiometer \u0026amp; Crab-Eye Nut for Motorola Mag One\u003c\/h2\u003e\n\u003ch3\u003eGenuine Motorola Solutions Original on\/off volume potentiometer switch with slotted crab-eye retaining nut for Mag One BPR40 and Alpha L radios.\u003c\/h3\u003e\n\u003cp\u003eThe \u003cb\u003eMotorola PMDN4016AR\u003c\/b\u003e (also cataloged as \u003cb\u003ePMDN4016\u003c\/b\u003e and \u003cb\u003ePMDN4016A\u003c\/b\u003e) is an authentic original equipment manufacturer (OEM) replacement volume potentiometer switch and retaining crab-eye spanner nut assembly engineered specifically for Motorola Mag One portable two-way radios. Designed for radio repair technicians, commercial depot service centers, and fleet maintenance shops, this component restores reliable on\/off power switching and clear audio level control to heavily used portables. Sourced directly from our verified inventory of \u003ca rel=\"noopener\" href=\"\/collections\/motorola\" target=\"_blank\"\u003e\u003cb\u003eMotorola Two-Way Radios \u0026amp; Accessories\u003c\/b\u003e\u003c\/a\u003e, the PMDN4016AR eliminates scratchy volume adjustments, intermittent power shutdowns, and loose control shafts caused by daily wear or drops.\u003c\/p\u003e\n\u003cp\u003eFrequent channel adjustments, jobsite impacts, and accidental drops directly onto the volume knob can crack internal carbon wiper tracks or sheer solder pins on the radio's main circuit board. The \u003cb\u003eMotorola PMDN4016AR\u003c\/b\u003e provides factory-spec rotational torque and precision resistance, ensuring smooth audio gain adjustment in demanding commercial work zones compliant with occupational safety communication guidelines under \u003ca rel=\"noopener\" href=\"https:\/\/www.osha.gov\/\" target=\"_blank\"\u003e\u003cb\u003eOSHA Standards\u003c\/b\u003e\u003c\/a\u003e. Engineered and manufactured to meet rigorous electronic assembly reliability standards under \u003ca rel=\"noopener\" href=\"https:\/\/www.ipc.org\/\" target=\"_blank\"\u003e\u003cb\u003eIPC Standards\u003c\/b\u003e\u003c\/a\u003e (IPC-A-610), the assembly features heavy-duty through-hole solder pins and an impact-resistant metal control shaft built to endure severe vibration tested under \u003ca rel=\"noopener\" href=\"https:\/\/quicksearch.dla.mil\/\" target=\"_blank\"\u003e\u003cb\u003eDoD Standards\u003c\/b\u003e\u003c\/a\u003e (MIL-STD-810H). The included precision-machined slotted crab-eye nut secures the potentiometer barrel firmly against the upper radio housing, preventing shaft wobble and compressing the chassis gasket to maintain factory dust and moisture resistance certified under \u003ca rel=\"noopener\" href=\"https:\/\/www.iec.ch\/\" target=\"_blank\"\u003e\u003cb\u003eIEC Standards\u003c\/b\u003e\u003c\/a\u003e (IEC 60529 IP54).\u003c\/p\u003e\n\u003ch3\u003eKey Features \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eAuthentic OEM Replacement Component\u003c\/b\u003e: Direct factory-original replacement ensures exact PCB pin spacing, switch detent tactile feel, and electrical resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eResolves Audio \u0026amp; Power Issues\u003c\/b\u003e: Fixes common symptoms of failing radios, including static during volume adjustment, dead audio spots, and intermittent power cutoffs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSlotted Crab-Eye Nut Included\u003c\/b\u003e: Includes the precision-threaded collar spanner nut to anchor the switch solidly against the upper chassis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePreserves IP54 Chassis Sealing\u003c\/b\u003e: Threads tightly down onto the upper housing collar to compress the internal sealing gasket against moisture and dust intrusion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHeavy-Duty Metal Shaft\u003c\/b\u003e: Resists rotational fatigue, lateral impact forces, and stripping when the radio knob is turned or bumped.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePrecision Rotary Resistance\u003c\/b\u003e: Provides smooth, predictable volume tapering from low whispering levels up to full commercial audio output.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAttribute\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eMotorola Solutions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003ePMDN4016AR \/ PMDN4016A \/ PMDN4016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eReplacement Volume Potentiometer Switch \u0026amp; Retaining Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitch Functionality\u003c\/td\u003e\n\u003ctd\u003eIntegrated Rotary On\/Off Power Switch with Linear Volume Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Hardware\u003c\/td\u003e\n\u003ctd\u003eSlotted Crab-Eye Spanner Collar Nut Included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Format\u003c\/td\u003e\n\u003ctd\u003eThrough-Hole PCB Solder Termination with Chassis Panel Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003eDie-Cast Metal Barrel with High-Grade Contact Terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Radio Platforms\u003c\/td\u003e\n\u003ctd\u003eMotorola Mag One BPR40 \u0026amp; Mag One Alpha L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation Requirement\u003c\/td\u003e\n\u003ctd\u003eSoldering \u0026amp; Slotted Spanner Tool Required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor \/ Finish\u003c\/td\u003e\n\u003ctd\u003eMachined Metallic Finish with Brass Bushing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eCompatible Motorola Portable Two-Way Radios\u003c\/b\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eALPHAL\u003c\/td\u003e\n\u003ctd\u003eBPR40\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eRecommended Accessories \u0026amp; Replacement Hardware\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eBatteries \u0026amp; Power Management\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/motorola-pmnn4075\"\u003e\u003cb\u003eMotorola PMNN4075AR Mag One Li-Ion Battery\u003c\/b\u003e\u003c\/a\u003e – Authentic OEM 1500mAh lightweight lithium-ion rechargeable battery pack engineered specifically for the Mag One BPR40 portable radio.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/pmnn4071ar-motorola\"\u003e\u003cb\u003eMotorola PMNN4071AR Mag One NiMH Battery\u003c\/b\u003e\u003c\/a\u003e – Genuine Motorola high-durability nickel-metal hydride rechargeable battery for standard-duty BPR40 commercial applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eCarry \u0026amp; Holster Solutions\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/motorola-pmln4743\"\u003e\u003cb\u003eMotorola PMLN4743A Mag One Spring Belt Clip\u003c\/b\u003e\u003c\/a\u003e – OEM replacement spring-action belt clip designed to mount securely onto BPR40 battery packs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eAntennas \u0026amp; RF Accessories\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/motorola-pmae4020ar\"\u003e\u003cb\u003eMotorola PMAE4020AR Mag One UHF Antenna\u003c\/b\u003e\u003c\/a\u003e – Authentic commercial UHF 450–470 MHz flexible whip antenna engineered for Mag One BPR40 radios.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/motorola-pmad4051ar\"\u003e\u003cb\u003eMotorola PMAD4051AR Mag One VHF Antenna\u003c\/b\u003e\u003c\/a\u003e – Genuine factory VHF 150–162 MHz flexible replacement antenna for Mag One BPR40 radios.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMore Resources\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca rel=\"noopener\" href=\"\/blogs\/news\/two-way-radio-maintenance-tips\" target=\"_blank\"\u003e\u003cb\u003e5 Essential Two-Way Radio Maintenance Tips\u003c\/b\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"noopener\" href=\"\/blogs\/news\/how-to-use-two-way-radio-step-by-step-guide\" target=\"_blank\"\u003e\u003cb\u003eHow to Use a Two-Way Radio: Step-by-Step Guide for Beginners\u003c\/b\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"noopener\" href=\"\/collections\/motorola-radio-batteries\" target=\"_blank\"\u003e\u003cb\u003eBrowse Motorola Two-Way Radio Batteries\u003c\/b\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"noopener\" href=\"\/collections\/motorola\" target=\"_blank\"\u003e\u003cb\u003eBrowse All Motorola Two-Way Radios \u0026amp; Accessories\u003c\/b\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eWhat is the difference between part numbers ending in \"A\", \"AR\", or having no letter?\u003c\/h4\u003e\n\u003cp\u003eThere is no functional, electrical, or dimensional difference. Motorola Solutions uses trailing letter suffixes (such as A or B) to indicate manufacturing revisions, while an \"AR\" or \"R\" suffix commonly denotes an authorized replacement service part kit. The parts cataloged as PMDN4016, PMDN4016A, and PMDN4016AR are physically and electrically identical, providing the exact same resistance values, PCB pin spacing, and chassis fitment.\u003c\/p\u003e\n\u003ch4\u003eCan this potentiometer be installed without soldering?\u003c\/h4\u003e\n\u003cp\u003eNo. The PMDN4016AR is a component-level replacement part that is soldered directly to the radio's internal printed circuit board. Proper installation requires professional soldering equipment to desolder the damaged switch and solder the new terminals into place.\u003c\/p\u003e\n\u003ch4\u003eWhat tool is required to tighten the included crab-eye nut?\u003c\/h4\u003e\n\u003cp\u003eThe retaining nut features two opposing slots (often called a crab-eye or spanner nut). It is tightened and loosened using a specialized radio spanner tool or crab-eye spanner bit. Using needle-nose pliers is not recommended, as they can slip and scratch the radio housing.\u003c\/p\u003e\n\u003ch4\u003eWill this potentiometer fix a radio that crackles when adjusting the volume?\u003c\/h4\u003e\n\u003cp\u003eYes. Crackling, scratchy audio, or dead audio zones when turning the knob are classic symptoms of worn or corroded internal carbon wiper tracks inside the potentiometer. Replacing the switch with a new PMDN4016AR restores clean, quiet volume control.\u003c\/p\u003e\n\u003ch4\u003eDoes this part include the plastic exterior volume knob?\u003c\/h4\u003e\n\u003cp\u003eNo. This listing includes the internal electronic volume potentiometer switch and the exterior threaded slotted crab-eye nut. The exterior plastic knob cap is transferred from the existing radio or purchased separately if damaged.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003e1-year manufacturer’s replacement warranty.\u003c\/p\u003e","brand":"Motorola","offers":[{"title":"Default Title","offer_id":67976743649454,"sku":"PMDN4016AR","price":26.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0062\/0845\/4744\/files\/PMDN4016ARa.png?v=1793994668","url":"https:\/\/www.atlanticradiocorp.com\/products\/motorola-pmdn4016","provider":"Atlantic Radio Communications Corp. ","version":"1.0","type":"link"}