{"product_id":"tackform-3-5in-duralock-20mm-ball-and-socket-arm-black-metal-dual-socket-with-optional-anti-theft","title":"Tackform 3.5in DuraLock 20mm Ball-and-Socket Arm, Black Metal — Dual-Socket with Optional Anti-Theft","description":"\u003cp\u003e\u003cstrong\u003eThe Tackform DuraLock 20 Series 3.5\" metal arm is a heavy-duty dual 20mm ball-and-socket mounting link in black with an optional anti-theft knob for secure, highly adjustable device positioning.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact, precision-machined arm is part of Tackform's 20 Series platform and is engineered to deliver repeatable, strong mounts for phones, GPS units, cameras, and accessories that use the 20mm ball system. Built from metal and finished in matte black, the DuraLock arm offers broad articulation through its dual-socket layout while providing an optional patent-pending anti-theft knob to reduce unwanted removal in exposed environments like motorcycles or side-by-sides.\u003c\/p\u003e\n\n\u003ch3\u003eHow much movement and reach will this 3.5\" arm give me?\u003c\/h3\u003e\n\u003cp\u003eThe DuraLock design uses two 20mm sockets to maximize articulation so you can fine-tune pitch, yaw, and roll without compromise. The short 3.5\" end-to-end length provides compact reach while still allowing significant adjustment through each ball joint.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eArm end-to-end length: 3.5\"\u003c\/li\u003e\n  \u003cli\u003eBall center to ball center on the arm: 2.75\"\u003c\/li\u003e\n  \u003cli\u003eWhen combined into a larger Tackform assembly: overall length can reach about 8\" with a 7.17\" (182 mm) center-to-center span\u003c\/li\u003e\n  \u003cli\u003eDual-socket layout gives a wider range of tilt and rotation than a single-link arm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this compatible with my existing 20mm mounts and accessories?\u003c\/h3\u003e\n\u003cp\u003eYes — the arm is made for the 20mm ball-and-socket ecosystem and fits most components from Bulletpoint, 67 Designs, iBOLT, and other manufacturers that use 20mm balls. It is not compatible with larger 25.4mm (1\"\/B-sized) balls.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStandard 20mm ball sockets for broad cross-brand compatibility\u003c\/li\u003e\n  \u003cli\u003eNot suitable for 25.4mm \/ 1\" \/ B-sized systems\u003c\/li\u003e\n  \u003cli\u003eWorks with Tackform 20 Series bases, clamps, and device holders\u003c\/li\u003e\n  \u003cli\u003eEngineered load capacities and tested durability for reliable performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the optional anti-theft knob work and when should I use it?\u003c\/h3\u003e\n\u003cp\u003eThe optional patent-pending anti-theft knob adds a simple mechanical resistance to the socket interface to deter quick snatch-and-grab removal. It’s helpful for exposed installations — motorcycles, UTVs, or public-facing vehicles — where extra retention is desirable without changing mount geometry.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAnti-theft knob increases resistance between ball and socket\u003c\/li\u003e\n  \u003cli\u003ePrevents accidental or casual removal if not fully tightened\u003c\/li\u003e\n  \u003cli\u003eCan be used selectively when mounting in unsecured or public environments\u003c\/li\u003e\n  \u003cli\u003eRemains optional — arm works normally without the knob installed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes the DuraLock 20 Series different from cheaper 20mm parts?\u003c\/h3\u003e\n\u003cp\u003eTackform emphasizes tested durability and a conservative safety factor, with metal construction and precision machining aimed at long-term reliability. The DuraLock series focuses on repeatable clamping performance and predictable load handling, rather than minimal-cost materials that can loosen or deform under stress.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMetal construction for stiffness and longevity\u003c\/li\u003e\n  \u003cli\u003ePrecision 20mm ball-and-socket tolerances for consistent clamping\u003c\/li\u003e\n  \u003cli\u003eTested load capacities and engineered safety margins\u003c\/li\u003e\n  \u003cli\u003eMatte black finish for corrosion resistance and low-glare aesthetics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Tackform DuraLock 3.5\" dual 20mm arm is ideal for riders, off-roaders, and professionals who need a compact yet highly adjustable mount that won’t compromise strength. Choose this arm if you already use the 20mm ecosystem and want a robust metal link that offers wide articulation, proven load-handling, and the option of an anti-theft knob for extra retention in exposed situations. If you require compatibility with 1\"\/25.4mm ball systems, select a B-sized product instead.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this arm fit my 20mm phone mount?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It fits standard 20mm ball mounts from Bulletpoint, 67 Designs, iBOLT, and similar 20mm systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use the anti-theft knob while riding off-road?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The optional knob increases retention to reduce accidental removal in exposed or mobile environments.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Tackform","offers":[{"title":"Default Title","offer_id":48085581955230,"sku":"B0CQ737QXX","price":35.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/tackform-duralock-20-front-view.jpg?v=1785873877","url":"https:\/\/northtrailauto.ca\/products\/tackform-3-5in-duralock-20mm-ball-and-socket-arm-black-metal-dual-socket-with-optional-anti-theft","provider":"North Trail Auto","version":"1.0","type":"link"}