{"title":"Down Spiral Router Bits","description":"\u003cp data-end=\"526\" data-start=\"0\"\u003eOur plastic down spiral bits are engineered for clean top-edge finishes when routing acrylic, HDPE, PVC, polycarbonate, and other plastics. These uncoated down-spiral CNC router bits use a downward-cutting flute geometry to push the material into the bed, helping reduce top-edge chipping, lifting, and vibration while producing a smoother visible edge. Each bit is manufactured from premium micro-grain carbide, ensuring stiffness, durability, and consistent cutting performance across demanding workshop and production jobs.\u003cbr\u003e\u003cbr\u003eWhether you're cutting signage, machining plastic sheets, trimming components, or profiling parts where the top surface matters, these down spiral bits for plastic deliver reliable results across a wide range of materials. Additionally, the uncoated finish keeps costs down while providing strong performance for general-purpose routing, prototyping, and daily CNC use.\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eKey benefits include:\u003cbr\u003e\u003c\/span\u003e- Clean top-edge finishes\u003cbr\u003e- Reduced material lifting\u003cbr\u003e- Improved hold-down performance\u003cbr\u003e- Reduced chipping on the visible face\u003cbr\u003e- Strong tool life in plastic machining\u003cbr\u003e- Compatible with most CNC routers\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eThese tools are ideal for tradespeople, signmakers, fabricators, and CNC professionals who need a dependable plastic routing tool where surface finish and material control are critical.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"down-spiral-plastic-router-bit-4x12","title":"Up-Spiral Plastic Router Bit - 4x12","description":"\u003csection class=\"product-description\" style=\"line-height: 1.4; font-size: 14px; color: #f2f2f2; background: transparent;\"\u003e\u003c!--\n    Shadow rules:\n    DARK containers:\n      inset 0px 2px 4px rgba(255,255,255,0.5),\n      5px 8px 10px rgba(0,0,0,0.5),\n      0 0px 1px rgba(0,0,0,0.5)\n\n    LIGHTER containers (chips):\n      inset 0px 2px 4px #1c1c1c,\n      5px 8px 10px rgba(0,0,0,0.45),\n      0 0px 1px rgba(0,0,0,0.45)\n  --\u003e \u003c!-- HERO \/ INTRO --\u003e\n\u003cdiv style=\"border: 1px solid #000; border-radius: 16px; padding: 16px; background: #161616; margin: 16px 0; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5);\"\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start; gap: 14px;\"\u003e\n\u003c!-- Down-spiral \/ hold-down icon --\u003e \u003csvg width=\"52\" height=\"52\" viewbox=\"0 0 24 24\" aria-hidden=\"true\" style=\"flex: 0 0 auto;\"\u003e\n      \u003cpath d=\"M6 8c4 0 8 6 12 6\" fill=\"none\" stroke=\"#dca101\" stroke-width=\"2.6\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n      \u003cpath d=\"M6 11c4 0 8 6 12 6\" fill=\"none\" stroke=\"#f2f2f2\" stroke-width=\"2.6\" stroke-linecap=\"round\" opacity=\"0.4\"\u003e\u003c\/path\u003e\n      \u003cpath d=\"M18.5 17.5l2.5-2.5-2.5-2.5\" fill=\"none\" stroke=\"#f2f2f2\" stroke-width=\"2.2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003c\/path\u003e\n    \u003c\/svg\u003e\n\u003cdiv style=\"color: #d7d7d7;\"\u003ePurpose-built for \u003cb style=\"color: #dca101;\"\u003eclean top-edge plastic machining\u003c\/b\u003e, this Plastic Down Spiral Router Bit is optimised for \u003cb style=\"color: #dca101;\"\u003eacrylic, PVC, polycarbonate\u003c\/b\u003e and \u003cb style=\"color: #dca101;\"\u003eHDPE\u003c\/b\u003e. The \u003cb style=\"color: #dca101;\"\u003esingle-flute down-cut\u003c\/b\u003e geometry pushes the material into the bed, helping reduce lifting, vibration, and top-edge chipping. With a cutting size of \u003cb style=\"color: #dca101;\"\u003e4mm × 12mm\u003c\/b\u003e, it’s a strong choice for sheet work, profiles, shallow pockets, and jobs where the visible top edge matters.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- KEY BENEFITS --\u003e\n\u003cdiv class=\"key-benefits\" style=\"border: 1px solid #000; border-radius: 16px; padding: 18px; background: #161616; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5); margin: 30px 0px;\"\u003e\n\u003cdiv style=\"display: flex; align-items: center; gap: 14px; margin-bottom: 14px;\"\u003e\n\u003csvg width=\"28\" height=\"28\" viewbox=\"0 0 24 24\" aria-hidden=\"true\" style=\"flex: 0 0 auto;\"\u003e\n      \u003cpath fill=\"#dca101\" d=\"M9.2 16.6 4.8 12.2l1.4-1.4 3 3L17.8 5.2l1.4 1.4z\"\u003e\u003c\/path\u003e\n    \u003c\/svg\u003e\n\u003cdiv style=\"font-weight: 800; font-size: 18px; letter-spacing: 0.2px;\"\u003eKey benefits\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: grid; gap: 12px;\"\u003e\n\u003c!-- Benefit 1 --\u003e\n\u003cdiv style=\"display: flex; gap: 14px; padding: 14px; border: 1px solid #000; border-radius: 14px; background: #2a2a2a; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5);\"\u003e\n\u003csvg width=\"40\" height=\"40\" viewbox=\"0 0 24 24\" aria-hidden=\"true\" style=\"flex: 0 0 auto;\"\u003e\n        \u003cpath d=\"M6 8c4 0 8 6 12 6\" fill=\"none\" stroke=\"#dca101\" stroke-width=\"2.2\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n        \u003cpath d=\"M18.5 17.5l2.5-2.5-2.5-2.5\" fill=\"none\" stroke=\"#f2f2f2\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003c\/path\u003e\n      \u003c\/svg\u003e\n\u003cdiv style=\"color: #d6d6d6;\"\u003e\n\u003cb style=\"color: #dca101;\"\u003eClean top-edge finish\u003c\/b\u003e helps reduce chipping and breakout on the visible face of plastic sheets.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Benefit 2 --\u003e\n\u003cdiv style=\"display: flex; gap: 14px; padding: 14px; border: 1px solid #000; border-radius: 14px; background: #2a2a2a; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5);\"\u003e\n\u003csvg width=\"40\" height=\"40\" viewbox=\"0 0 24 24\" aria-hidden=\"true\" style=\"flex: 0 0 auto;\"\u003e\n        \u003cpath d=\"M12 2l2.2 6.2L20 10l-5.8 1.8L12 18l-2.2-6.2L4 10l5.8-1.8L12 2z\" fill=\"#dca101\" opacity=\"0.18\"\u003e\u003c\/path\u003e\n        \u003cpath d=\"M12 4.3l1.4 3.9 3.7 1.1-3.7 1.1L12 14.3l-1.4-3.9-3.7-1.1 3.7-1.1L12 4.3z\" fill=\"#f2f2f2\"\u003e\u003c\/path\u003e\n      \u003c\/svg\u003e\n\u003cdiv style=\"color: #d6d6d6;\"\u003e\n\u003cb style=\"color: #dca101;\"\u003ePolished cutting edge\u003c\/b\u003e supports smoother cutting and helps reduce heat build-up in plastics.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Benefit 3 --\u003e\n\u003cdiv style=\"display: flex; gap: 14px; padding: 14px; border: 1px solid #000; border-radius: 14px; background: #2a2a2a; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5);\"\u003e\n\u003csvg width=\"40\" height=\"40\" viewbox=\"0 0 24 24\" aria-hidden=\"true\" style=\"flex: 0 0 auto;\"\u003e\n        \u003cpath d=\"M12 4\n                 c4 0 6 2.5 6 5\n                 0 2.2-1.8 4-4 4\n                 -1.8 0-3-1.2-3-2.5\n                 0-1.2 1-2 2.2-2\n                 1 0 1.8.6 1.8 1.4\" fill=\"none\" stroke=\"#dca101\" stroke-width=\"2.6\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003c\/path\u003e\n      \u003c\/svg\u003e\n\u003cdiv style=\"color: #d6d6d6;\"\u003eThe single-flute design helps \u003cb style=\"color: #dca101;\"\u003emanage heat and chip load\u003c\/b\u003e, reducing melting, gumming, and re-welding.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Benefit 4 --\u003e\n\u003cdiv style=\"display: flex; gap: 14px; padding: 14px; border: 1px solid #000; border-radius: 14px; background: #2a2a2a; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5);\"\u003e\n\u003csvg width=\"40\" height=\"40\" viewbox=\"0 0 24 24\" aria-hidden=\"true\" style=\"flex: 0 0 auto;\"\u003e\n        \u003cpath d=\"M4 7h16v10H4z\" fill=\"#dca101\" opacity=\"0.16\"\u003e\u003c\/path\u003e\n        \u003cpath d=\"M7 10h10M7 13h6\" stroke=\"#f2f2f2\" stroke-width=\"2.2\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n        \u003cpath d=\"M16.5 14.8l2-2-2-2\" fill=\"none\" stroke=\"#f2f2f2\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\" opacity=\"0.55\"\u003e\u003c\/path\u003e\n      \u003c\/svg\u003e\n\u003cdiv style=\"color: #d6d6d6;\"\u003eDown-cut geometry improves \u003cb style=\"color: #dca101;\"\u003ematerial hold-down\u003c\/b\u003e, helping keep thin sheets flatter during routing.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Benefit 5 --\u003e\n\u003cdiv style=\"display: flex; gap: 14px; padding: 14px; border: 1px solid #000; border-radius: 14px; background: #2a2a2a; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5);\"\u003e\n\u003csvg width=\"40\" height=\"40\" viewbox=\"0 0 24 24\" aria-hidden=\"true\" style=\"flex: 0 0 auto;\"\u003e\n        \u003cpath d=\"M12 2l8 4v6c0 5-3.4 9.3-8 10-4.6-.7-8-5-8-10V6l8-4z\" fill=\"#dca101\" opacity=\"0.18\"\u003e\u003c\/path\u003e\n        \u003cpath d=\"M9 12l2 2 4-5\" fill=\"none\" stroke=\"#f2f2f2\" stroke-width=\"2.4\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003c\/path\u003e\n      \u003c\/svg\u003e\n\u003cdiv style=\"color: #d6d6d6;\"\u003e\n\u003cb style=\"color: #dca101;\"\u003eHigh-quality carbide\u003c\/b\u003e for rigidity and accuracy—less deflection and better edge control.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- SPEC TABLE --\u003e\u003c\/section\u003e\n\u003cstyle\u003e\n  .atlas-spec-table-wrap {\n    padding: 5px;\n    margin: 30px 0 0;\n    border: 1px solid #000;\n    border-radius: 16px;\n    overflow: hidden;\n    background: #161616;\n    box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5);\n  }\n\n  .atlas-spec-table {\n    width: 100%;\n    border-collapse: separate;\n    border-spacing: 0;\n    border: 0;\n    margin: 0;\n    background: transparent;\n  }\n\n  .atlas-spec-table th {\n    background: #dca101;\n    color: #000000;\n    text-align: left;\n    padding: 14px 16px;\n    font-size: 14px;\n    font-weight: 800;\n  }\n\n  .atlas-spec-table th:first-child {\n    border-top-left-radius: 12px;\n    border-right: 1px solid rgba(0,0,0,0.2);\n  }\n\n  .atlas-spec-table td {\n    padding: 14px 16px;\n    border-top: 1px solid rgba(255,255,255,0.08);\n  }\n\n  .atlas-spec-table td:first-child {\n    width: 42%;\n    border-right: 1px solid rgba(255,255,255,0.08);\n    color: #f2f2f2;\n    font-weight: bold;\n  }\n\n  .atlas-spec-table td:last-child {\n    color: #d6d6d6;\n  }\n\n  .atlas-spec-table tbody tr:nth-child(odd) td {\n    background: #1f1f1f;\n  }\n\n  .atlas-spec-table tbody tr:nth-child(even) td {\n    background: #161616;\n  }\n\n  .atlas-spec-table th:first-child { border-top-left-radius: 12px; }\n  .atlas-spec-table th:last-child { border-top-right-radius: 12px; }\n\u003c\/style\u003e\n\u003csection class=\"product-description\" style=\"line-height: 1.4; font-size: 14px; color: #f2f2f2; background: transparent;\"\u003e\n\u003cdiv class=\"atlas-spec-table-wrap\"\u003e\n\u003ctable class=\"atlas-spec-table\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eResult\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut Length\u003c\/td\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShank (Collet Size)\u003c\/td\u003e\n\u003ctd\u003e4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e38mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlutes\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut Direction\u003c\/td\u003e\n\u003ctd\u003eDown Spiral \/ Down-Cut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c!-- FINISH \/ EDGE QUALITY SECTION --\u003e\n\u003cdiv style=\"border: 1px solid #000; border-radius: 16px; padding: 16px; background: #161616; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5); margin: 30px 0px;\"\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start; gap: 14px; margin-bottom: 12px;\"\u003e\n\u003csvg width=\"52\" height=\"52\" viewbox=\"0 0 24 24\" aria-hidden=\"true\" style=\"flex: 0 0 auto;\"\u003e\n      \u003cpath d=\"M12 2l2.2 6.2L20 10l-5.8 1.8L12 18l-2.2-6.2L4 10l5.8-1.8L12 2z\" fill=\"#dca101\" opacity=\"0.18\"\u003e\u003c\/path\u003e\n      \u003cpath d=\"M12 4.3l1.4 3.9 3.7 1.1-3.7 1.1L12 14.3l-1.4-3.9-3.7-1.1 3.7-1.1L12 4.3z\" fill=\"#f2f2f2\"\u003e\u003c\/path\u003e\n    \u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cdiv style=\"font-size: 18px; font-weight: 800; color: #ffffff; margin: 0 0 6px 0;\"\u003eDown-cut geometry for clean top-edge results\u003c\/div\u003e\n\u003cdiv style=\"color: #d0d0d0;\"\u003eThe down-spiral flute pushes cutting pressure downward, helping hold the sheet against the spoilboard and protect the visible top surface. This is especially useful for plastic signs, panels, and components where a \u003cb style=\"color: #dca101;\"\u003eclean top edge\u003c\/b\u003e is the priority.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; gap: 14px; padding: 14px; border: 1px solid #000; border-radius: 14px; background: #2a2a2a; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5);\"\u003e\n\u003csvg width=\"40\" height=\"40\" viewbox=\"0 0 24 24\" aria-hidden=\"true\" style=\"flex: 0 0 auto;\"\u003e\n      \u003cpath d=\"M12 4\n               c4 0 6 2.5 6 5\n               0 2.2-1.8 4-4 4\n               -1.8 0-3-1.2-3-2.5\n               0-1.2 1-2 2.2-2\n               1 0 1.8.6 1.8 1.4\" fill=\"none\" stroke=\"#dca101\" stroke-width=\"2.6\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003c\/path\u003e\n    \u003c\/svg\u003e\n\u003cdiv style=\"color: #d0d0d0;\"\u003eThe single-flute design provides more chip space than multi-flute tools, helping control heat and reduce melting when routing acrylic, PVC, polycarbonate, and HDPE.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- VERSATILITY SECTION --\u003e\n\u003cdiv style=\"border: 1px solid #000; border-radius: 16px; padding: 16px; background: #161616; margin-top: 14px; box-shadow: inset 0px 1px 2px rgba(255,255,255,0.5), 5px 8px 10px rgba(0,0,0,0.5), 0 0px 1px rgba(0,0,0,0.5);\"\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start; gap: 14px;\"\u003e\n\u003csvg width=\"52\" height=\"52\" viewbox=\"0 0 24 24\" aria-hidden=\"true\" style=\"flex: 0 0 auto;\"\u003e\n      \u003cpath d=\"M14 3a6 6 0 0 0 7 7l-2 2-2-2-9 9-3-3 9-9-2-2 2-2z\" fill=\"#f2f2f2\"\u003e\u003c\/path\u003e\n      \u003cpath d=\"M4 20l2-2 2 2-2 2H4v-2z\" fill=\"#dca101\" opacity=\"0.45\"\u003e\u003c\/path\u003e\n    \u003c\/svg\u003e\n\u003cdiv style=\"color: #d0d0d0;\"\u003e\n\u003cdiv style=\"font-size: 18px; font-weight: 800; color: #ffffff; margin: 0 0 6px 0;\"\u003eApplications and benefits\u003c\/div\u003e\n\u003cdiv\u003eIdeal for \u003cb style=\"color: #dca101;\"\u003esign makers, fabricators\u003c\/b\u003e and CNC users cutting acrylic sheet, PVC foam board, polycarbonate, HDPE, and general plastics. The 4mm diameter gives extra strength over smaller 3.175mm tools, while the 12mm cut length suits thinner sheet work and controlled profiling where top-edge finish is critical.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e","brand":"Atlas Tools","offers":[{"title":"Default Title","offer_id":46835812729020,"sku":null,"price":55.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0700\/0689\/8876\/files\/Atlas_Tools_Router_Bit_4x12_Down_Spiral_General_Purpose_MAIN_SHOT.png?v=1779102238"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0700\/0689\/8876\/collections\/Up-SpiralAluminium5_f49cda39-3c59-487a-af08-2af14e0787ec.png?v=1779102549","url":"https:\/\/atlastools.co\/collections\/down-spiral-router-bits.oembed","provider":"Atlas Tools","version":"1.0","type":"link"}