{"product_id":"knew-concepts-jewelers-precision-hand-saws-with-knob-tension","title":"Knew Concepts Mk.V Saw Frames with Tensioning Screw 3\" \u0026 5\"","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eThe new and improved Mk.V Jewelers saw frames, also called fret saws.  Now stronger, with improved blade clamps.  The new clamps have witness holes, so you can see the back of the blade to make sure you've really grabbed it.  The extra length in the clamps also gives the clamps more to hold on to, for improved grip.  The new witness hole lets sawdust drop out of the bottom of the clamps, to keep them grabbing solidly.  The frames now have the same triangulated truss design that makes the Mk. IV saws so much stronger.  A major improvement over the older MK. III design.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eKnew Concepts Screw-Tension Saw Frames\u003c\/strong\u003e are the original precision fret saws that set the standard for control and rigidity in jewelry sawing. These economy version delivers ultra-precise blade tension through a \u003cstrong\u003eknurled tension nut\u003c\/strong\u003e at the top of the frame. The rigid, heat-treated aluminum construction minimizes flex, improving accuracy and reducing blade breakage. When balance, feel, lightness, and stiffness matter most, this is the jeweler’s saw frame of choice.\u003c\/p\u003e\n\u003ch3\u003eChoose Your Throat Depth\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003ePart No.\u003c\/th\u003e\n\u003cth\u003eThroat Depth\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e149.653\u003c\/td\u003e\n\u003ctd\u003e3\" (75 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e149.655\u003c\/td\u003e\n\u003ctd\u003e5\" (125 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePrecision screw-tensioning system for exact, repeatable blade tension.\u003c\/li\u003e\n\u003cli\u003eRigid, heat-treated aluminum frame reduces flex for cleaner, straighter cuts.\u003c\/li\u003e\n\u003cli\u003eKnurled gold-tone blade holders for secure clamping and easy blade changes.\u003c\/li\u003e\n\u003cli\u003eExtremely lightweight frame minimizes fatigue during extended sawing sessions.\u003c\/li\u003e\n\u003cli\u003eFull tension achieved through the screw mechanism—no need to flex the frame against your chest.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Install \u0026amp; Tension the Blade\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eInsert the saw blade with teeth pointing downward and outward.\u003c\/li\u003e\n\u003cli\u003eSecure both blade ends using the gold-tone clamps.\u003c\/li\u003e\n\u003cli\u003eTighten the top knurled tension knob until the blade produces a clear, high “ping.”\u003c\/li\u003e\n\u003cli\u003eTo change blades, slightly loosen the clamps, replace the blade, and re-tension with the screw knob.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eWhy Blade Tension Matters\u003c\/h3\u003e\n\u003cp\u003eThe purpose of any jeweler’s saw is to hold a fine, toothed blade tightly and accurately in line. Proper tension ensures smooth, controlled cutting, prevents wandering, and extends blade life. The Knew Concepts frame achieves high, stable tension through its rigid truss design and precision screw adjustment.\u003c\/p\u003e\n\u003ch3\u003ePerformance \u0026amp; Ergonomics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBalanced and lightweight for long hours of precise work.\u003c\/li\u003e\n\u003cli\u003eOptimized stiffness provides superior control and stability.\u003c\/li\u003e\n\u003cli\u003eCompatible with standard 5-1\/8\" unpinned jeweler’s saw blades, including spiral and fine-gauge types.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eUse \u0026amp; Care Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIf the blade slips, clean the clamp faces and ensure even tightening.\u003c\/li\u003e\n\u003cli\u003eKeep blade alignment straight for best cutting results.\u003c\/li\u003e\n\u003cli\u003eStore with the blade relaxed if the saw will not be used for an extended period.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eKnew Concepts screw-tension saw frame (select 3\" or 5\" throat)\u003c\/li\u003e\n\u003cli\u003ePrinted instructions for blade setup and tensioning\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOptional Upgrades\u003c\/h3\u003e\n\u003cp\u003eHeavier-duty 8\" Mk IV versions are available separately for users needing additional throat depth and maximum frame stiffness.\u003c\/p\u003e","brand":"Knew Concepts","offers":[{"title":"3\" (75mm)","offer_id":43696834511062,"sku":"149.653","price":85.0,"currency_code":"USD","in_stock":false},{"title":"5\" (125mm)","offer_id":43696834543830,"sku":"149.655","price":89.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/9832\/0342\/files\/knew-mkv-tensioning-screw-3in-5in-pair-otto-frei.jpg?v=1787590321","url":"https:\/\/www.ottofrei.com\/ja\/products\/knew-concepts-jewelers-precision-hand-saws-with-knob-tension","provider":"Otto Frei","version":"1.0","type":"link"}