{"product_id":"apo-mc-10-non-rotating-mast-adapter-for-rohn-glen-martin-towers","title":"APO MC-10 Non-Rotating Mast Adapter for Rohn \u0026 Glen Martin Towers","description":"\u003cp\u003eIn this review the APO MC-10 is evaluated as a functional, no-nonsense mast adapter for users who need a secure, non-rotating mounting solution. The bottom line: this adapter is for installers and hobbyists who require a rigid clamp that fits common tower flanges and holds masts from 1-1\/4' to 2-3\/16'. Its strongest merit is the machined 6061-T6 aluminum construction paired with stainless steel hardware, which delivers reliable corrosion resistance and a snug, long-term hold for non-rotating mast installations.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-rotating mast fastening:\u003c\/strong\u003e Keeps vertical masts from turning under load, providing a stable support for antennas and repeaters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMast diameter range:\u003c\/strong\u003e Accepts masts from 1-1\/4' up to 2-3\/16', covering the most common residential and light commercial mast sizes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting flange compatibility:\u003c\/strong\u003e Threads to standard 5-1\/6'-18 flange fittings on a 3-1\/2' bolt pattern for direct fit to many Rohn and Glen Martin towers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-bolt mast clamp:\u003c\/strong\u003e Uses four bolts to lock the mast in place, delivering a secure mechanical grip and straightforward installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAircraft-grade materials:\u003c\/strong\u003e Machined 6061-T6 aluminum body with stainless steel hardware resists corrosion and stands up to outdoor exposure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe APO MC-10 is ideal for tower installers, radio hobbyists, and homeowners mounting antennas on Rohn and Glen Martin towers or similar hazer and rooftop tower systems who need a durable, non-rotating solution. It suits projects where a precise flange interface and a tight, corrosion-resistant clamp are essential.\u003c\/p\u003e\n\u003cp\u003eIt is less appropriate for those who need a rotating slip-ring mast or for installations requiring masts outside the 1-1\/4' to 2-3\/16' range. Also, installations that demand a single-point mount for both rotation and tilt may require a different adapter or additional components.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRobust 6061-T6 machined aluminum construction provides long-term durability in outdoor environments.\u003c\/li\u003e\n\u003cli\u003eStainless steel hardware resists corrosion at exposed fasteners, reducing maintenance needs.\u003c\/li\u003e\n\u003cli\u003eCompatible 5-1\/6'-18 flange and 3-1\/2' bolt pattern fits many Rohn and Glen Martin tower applications for straightforward mounting.\u003c\/li\u003e\n\u003cli\u003eWide mast diameter range covers most common mast sizes used in residential and light commercial antenna work.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA typical non-rotating installation requires two units (upper and lower), which adds to the total system cost and parts count.\u003c\/li\u003e\n\u003cli\u003eNot suitable for installations that require mast rotation or for masts outside the specified diameter range.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eAntenna Parts Outlet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eMachined 6061-T6 aircraft aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eStainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum mast diameter\u003c\/td\u003e\n\u003ctd\u003e2-3\/16' \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum mast diameter\u003c\/td\u003e\n\u003ctd\u003e1-1\/4' \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlange threads\u003c\/td\u003e\n\u003ctd\u003e5-1\/6'-18 on 3-1\/2' bolt pattern\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping method\u003c\/td\u003e\n\u003ctd\u003eFour-bolt lock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe APO MC-10 is a practical, well-made adapter for anyone installing non-rotating masts on Rohn or Glen Martin towers. Its aircraft-grade aluminum and stainless steel hardware make it a durable choice, and the flange compatibility keeps installation simple. For projects that need a reliable stationary mount and fall within the specified mast diameters, this adapter represents good value when paired as the necessary upper and lower units.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHow many units are required for a typical non-rotating mast?\u003c\/strong\u003e\u003cbr\u003eNon-rotating mast installations usually require two units, one for the upper mount and one for the lower mount.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat mast sizes will this adapter accept?\u003c\/strong\u003e\u003cbr\u003eThe adapter fits masts with diameters between 1-1\/4' and 2-3\/16'.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit Rohn and Glen Martin tower flanges?\u003c\/strong\u003e\u003cbr\u003eYes, it uses a 5-1\/6'-18 threaded flange on a 3-1\/2' bolt pattern compatible with many Rohn and Glen Martin applications.\u003c\/p\u003e","brand":"Antenna Parts Outlet","offers":[{"title":"Default Title","offer_id":48601453134043,"sku":"B084GYTN3B","price":73.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51UYRT3bAuL._AC_SL1000.jpg?v=1778365727","url":"https:\/\/gearmusthave.com\/products\/apo-mc-10-non-rotating-mast-adapter-for-rohn-glen-martin-towers","provider":"GearMustHave","version":"1.0","type":"link"}