{"product_id":"the-straight-line-sbr-linear-rail-kit","title":"The Straight Line | SBR Fully Supported Linear Rail Kit with Block Bearings (CNC)","description":"\n\u003cdiv class=\"product-narrative\"\u003e\n\u003cp\u003e\u003cstrong\u003ePrecision is not a tolerance. It is a philosophy.\u003c\/strong\u003e The Straight Line is a fully supported linear rail kit for CNC builders who have learned the hard way that a machine is only as truthful as its axes. Every cut, every engraving pass, every repeatable dimension on your workbench depends on a rail that refuses to sag, bind, or drift.\u003c\/p\u003e\n\u003cp\u003eThe shaft is case hardened, which is the detail that separates serious rails from toys. On a soft shaft, the bearing blocks will cut grooves into the steel within weeks, and your machine will start producing the kind of errors you blame on the router bit. Hardened shafts keep that from happening, and the fully supported aluminum rail underneath prevents deflection over long spans, so a 1200mm axis moves as straight as a 300mm one. The support rail arrives pre-drilled, so mounting is a matter of bolting it to your extrusion or plate rather than a day of layout work.\u003c\/p\u003e\n\u003cp\u003eEach kit includes two rails and four SBRUU block bearings, the working set for a single axis. Choose your diameter and length from the SBR12, SBR16, SBR20, or SBR25 range, and contact us for custom lengths if your build asks for something between the standard sizes. It suits X, Y, and Z axes, and the CE certification covers the engineering standard.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThis is not a rail. It is a promise your machine keeps on every pass.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-features\" style=\"margin-top: 25px;\"\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style: none; padding: 0;\"\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e✦ Case hardened shaft resists bearing wear and grooving\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e✦ Fully supported aluminum rail prevents deflection on long spans\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e✦ Pre-drilled holes for quick, accurate mounting\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e✦ Smooth, repeatable motion on X, Y, and Z axes\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e✦ SBR12, SBR16, SBR20, and SBR25 diameters from 300 to 1500mm\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e✦ Includes 2 rails and 4 SBRUU block bearings per set\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e✦ CE certified\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-specs\" style=\"margin-top: 25px;\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul style=\"list-style: none; padding: 0;\"\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\n\u003cstrong\u003eRail Type:\u003c\/strong\u003e SBR fully supported linear rail with shaft\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\n\u003cstrong\u003eAvailable Diameters:\u003c\/strong\u003e SBR12 \/ SBR16 \/ SBR20 \/ SBR25\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\n\u003cstrong\u003eAvailable Lengths:\u003c\/strong\u003e 300 to 1500mm (custom lengths on request)\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\n\u003cstrong\u003eBearing Blocks:\u003c\/strong\u003e 4x SBRUU solid block bearings per kit\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\n\u003cstrong\u003eShaft Treatment:\u003c\/strong\u003e Case hardened\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\n\u003cstrong\u003eSupport Rail:\u003c\/strong\u003e Aluminum with pre-drilled mounting holes\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e X, Y, Z axes for CNC routers and machines\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #eee;\"\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e CE\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-applications\" style=\"margin-top: 25px;\"\u003e\n\u003ch3\u003eApplication Scenarios\u003c\/h3\u003e\n\u003cp\u003eThe Straight Line is the axis kit for builders and retrofitters: CNC router owners upgrading a floppy stock rail, makers building a new machine from extrusion, and repair shops replacing worn shafts on production equipment. It is also the right choice for custom automation rigs, 3D printer conversions, and laser engraver gantries that need repeatable motion. Because the kit includes both rails and bearings, it is a drop-in axis package rather than a scavenger hunt across suppliers.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-faq\" style=\"margin-top: 25px;\"\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is included in one kit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Each kit contains two fully supported linear rails with shafts and four matching SBRUU solid block bearings, enough for one complete axis.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which diameter and length should I choose?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Match the diameter to the load and the bearing size your build uses. SBR12 and SBR16 suit light and medium loads, while SBR20 and SBR25 carry heavier gantries. Length should match the travel distance you need plus mounting margin.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Are custom lengths available?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes. If your build needs a length between the standard sizes, contact us before ordering and we can supply the rail cut to your specification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why does the shaft need to be case hardened?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Soft shafts develop grooves where the bearing balls ride, and those grooves show up as vibration and lost accuracy. Case hardening keeps the bearing surface intact under load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use these rails on a vertical axis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes, the fully supported design works on X, Y, and Z axes. For vertical applications, make sure the weight is counterbalanced or the motor is sized to hold the load.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do the rails arrive ready to run?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The shafts are coated with a light protective oil for shipping. Wipe them clean and apply your preferred linear rail grease before first use for smoothest travel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What do the SBR and SBRUU designations mean?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: SBR refers to the fully supported rail with shaft, and SBRUU identifies the open-type solid block bearing that rides on it. The UU blocks in each kit are matched to the rail diameter you select.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-gallery\" style=\"margin-top: 30px; text-align: center;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S0b3884eca86a471cbd2a9ee88632c386A.webp?v=1754275807\" alt=\"The Straight Line SBR fully supported linear rail kit\" style=\"max-width:100%;margin:8px 0;border-radius:4px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sdd479009d9a2448697ceb590bc9798d78.webp?v=1754275805\" alt=\"The Straight Line SBR fully supported linear rail kit\" style=\"max-width:100%;margin:8px 0;border-radius:4px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sf99398e73f3340c6ba75de13fde6841ft.webp?v=1754275805\" alt=\"The Straight Line SBR fully supported linear rail kit\" style=\"max-width:100%;margin:8px 0;border-radius:4px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S8aa23bb2e541442dbee84a3c0eab5464n.webp?v=1754275805\" alt=\"The Straight Line SBR fully supported linear rail kit\" style=\"max-width:100%;margin:8px 0;border-radius:4px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sbb0237031b4f42509606919014b1b8ddP.webp?v=1754275804\" alt=\"The Straight Line SBR fully supported linear rail kit\" style=\"max-width:100%;margin:8px 0;border-radius:4px;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S312dc83963c848f2acd267317f6f25bdt.webp?v=1754275805\" alt=\"The Straight Line SBR fully supported linear rail kit\" style=\"max-width:100%;margin:8px 0;border-radius:4px;\"\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"eastsupplier-promise\" style=\"margin-top: 30px; padding: 20px 24px; background: #f7f9fb; border-left: 4px solid #1a3a5c; border-radius: 4px;\"\u003e\n\u003ch3 style=\"margin-top: 0; color: #1a3a5c;\"\u003eThe EastSupplier Promise\u003c\/h3\u003e\n\u003cp style=\"margin: 8px 0;\"\u003eEvery EastSupplier listing is quality-checked before it ships. We verify materials, dimensions, and packaging against the manufacturer specification sheet, and we stand behind every order with responsive support and a straightforward returns policy.\u003c\/p\u003e\n\u003cp style=\"margin: 8px 0;\"\u003eIf the item you receive does not match its listing, contact us within 30 days and we will make it right. Our team replies within 24 hours, and our US and EU fulfillment network keeps delivery fast and trackable.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"The Straight Line | SBR Fully Supported Linear Rail Kit with Block Bearings (CNC)\",\n  \"image\": \"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S0b3884eca86a471cbd2a9ee88632c386A.webp?v=1754275807\",\n  \"description\": \"SBR fully supported linear rail kit with case hardened shaft and SBRUU block bearings, available in SBR12 to SBR25, 300 to 1500mm, CE certified.\",\n  \"brand\": {\"@type\": \"Brand\", \"name\": \"EastSupplier\"},\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"priceCurrency\": \"USD\",\n    \"price\": \"114.98\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"url\": \"https:\/\/eastsupplier.com\/products\/the-straight-line-sbr-linear-rail-kit\"\n  },\n  \"aggregateRating\": {\n    \"@type\": \"AggregateRating\",\n    \"ratingValue\": \"4.8\",\n    \"reviewCount\": \"12\"\n  }\n}\n\u003c\/script\u003e\n","brand":"East Supplier Platform","offers":[{"title":"Australia \/ SBR20 1000MM","offer_id":47195516764383,"sku":"1005004835963758-Australia-SBR20 1000MM","price":374.98,"currency_code":"USD","in_stock":true},{"title":"Russian Federation \/ SBR16 1200MM","offer_id":47195516862687,"sku":"1005004835963758-Russian Federation-SBR16 1200MM","price":147.47,"currency_code":"USD","in_stock":true},{"title":"Russian Federation \/ SBR20 1000MM","offer_id":47195517190367,"sku":"1005004835963758-Russian Federation-SBR20 1000MM","price":144.97,"currency_code":"USD","in_stock":true},{"title":"GERMANY \/ SBR20 1500MM","offer_id":47195517845727,"sku":"1005004835963758-GERMANY-SBR20 1500MM","price":159.97,"currency_code":"USD","in_stock":true},{"title":"GERMANY \/ SBR25 1200MM","offer_id":47195517878495,"sku":"1005004835963758-GERMANY-SBR25 1200MM","price":199.97,"currency_code":"USD","in_stock":true},{"title":"GERMANY \/ SBR20 1000MM","offer_id":47195517911263,"sku":"1005004835963758-GERMANY-SBR20 1000MM","price":132.47,"currency_code":"USD","in_stock":true},{"title":"GERMANY \/ SBR20 1200MM","offer_id":47195517944031,"sku":"1005004835963758-GERMANY-SBR20 1200MM","price":144.97,"currency_code":"USD","in_stock":true},{"title":"United States \/ SBR16 600MM","offer_id":47195518402783,"sku":"1005004835963758-United States-SBR16 600MM","price":114.98,"currency_code":"USD","in_stock":true},{"title":"United States \/ SBR16 1200MM","offer_id":47195518664927,"sku":"1005004835963758-United States-SBR16 1200MM","price":189.97,"currency_code":"USD","in_stock":true},{"title":"United States \/ SBR16 1500MM","offer_id":47195518697695,"sku":"1005004835963758-United States-SBR16 1500MM","price":269.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S0b3884eca86a471cbd2a9ee88632c386A.webp?v=1754275807","url":"https:\/\/eastsupplier.com\/en-jp\/products\/the-straight-line-sbr-linear-rail-kit","provider":"EastSupplier Platform","version":"1.0","type":"link"}