{"product_id":"sp8-sp30-ball-transfer-bearing-unit-conveyor-roller","title":"SP-8 SP-12 SP-15 SP-22 SP-25 SP-30 Ball Transfer Bearing Unit Conveyor Roller","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBall Transfer Bearing Unit Conveyor Roller — Smooth Omnidirectional Movement for Every Assembly\u003c\/h2\u003e\n\u003cp\u003eWhen your conveyor line, assembly table, or material-handling fixture demands frictionless, multi-directional load movement, a mismatched or undersized ball transfer unit becomes the bottleneck that slows every shift. Makers, fabricators, and industrial assemblers who need reliable omnidirectional rolling — without tools, without guesswork — will find the SP series ball transfer bearing unit built precisely for that challenge.\u003c\/p\u003e\n\u003cp\u003eEach unit consists of a hardened steel main ball seated in a precision-formed housing packed with smaller load-bearing balls, available in carbon steel or 304 stainless steel. The SP designation (SP8, SP12, SP15, SP22, SP25, SP30) refers to the main ball diameter in millimeters (approximately 0.31\" to 1.18\"), giving you a clear size matrix to match load capacity and mounting footprint to your application.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include DIY conveyor roller tables for woodworking shops, light-duty assembly line transfer stations, 3D-printer enclosure sliding panels, and CNC router material-staging fixtures — all scenarios where smooth omnidirectional ball transfer bearing movement reduces operator fatigue and cycle time.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Fits standard countersunk or through-hole mounting patterns. Carbon steel variants suit dry indoor environments; 304 stainless steel variants are suited for washdown, humid, or mildly corrosive settings. Verify mounting hole diameter against your selected SP size before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Ball Transfer Bearing Units\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n  \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eTrue Omnidirectional Rolling\u003c\/strong\u003e — The hardened main ball rotates 360° in any direction, enabling smooth load transfer without repositioning the workpiece.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eSix Size Options (SP8–SP30)\u003c\/strong\u003e — Main ball diameters from 8 mm (~0.31\") to 30 mm (~1.18\") let you match load capacity and housing footprint precisely to your fixture design.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eDual Material Choice\u003c\/strong\u003e — Carbon steel units offer cost-effective strength for dry indoor use; 304 stainless steel units resist oxidation in humid or washdown environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cstrong\u003eCompact, Flush-Mount Housing\u003c\/strong\u003e — Low-profile pressed-steel shell installs flush into countersunk holes, keeping the work surface clear and snag-free.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eTool-Free Ball Replacement\u003c\/strong\u003e — The main ball can be lifted out for cleaning or replacement without disassembling the housing, minimizing downtime on active lines.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏭\u003c\/span\u003e\u003cstrong\u003eWide Application Range\u003c\/strong\u003e — Suitable for conveyor tables, assembly fixtures, packaging lines, DIY roller tables, and sliding panel guides across light-to-medium duty loads.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Ball Transfer Bearing Units\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eBall Transfer Bearing Unit (Conveyor Roller)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSeries \/ Size Designation\u003c\/th\u003e\n\u003ctd\u003eSP8, SP12, SP15, SP22, SP25, SP30\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMain Ball Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm \/ 12 mm \/ 15 mm \/ 22 mm \/ 25 mm \/ 30 mm (0.31\"–1.18\")\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMaterial Options\u003c\/th\u003e\n\u003ctd\u003eCarbon Steel; 304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHousing Construction\u003c\/th\u003e\n\u003ctd\u003ePressed steel shell with inner load-bearing ball array\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLoad Capacity\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHousing Outer Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMounting Type\u003c\/th\u003e\n\u003ctd\u003eCountersunk \/ through-hole flush mount\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFinish — Carbon Steel\u003c\/th\u003e\n\u003ctd\u003eZinc-plated or black oxide (varies by batch)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFinish — Stainless Steel\u003c\/th\u003e\n\u003ctd\u003eNatural brushed 304 SS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePackage Contents\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I choose the right SP size for my application?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the SP number to the main ball diameter in millimeters: SP8 = 8 mm, SP12 = 12 mm, SP15 = 15 mm, SP22 = 22 mm, SP25 = 25 mm, SP30 = 30 mm. Larger balls support higher loads and suit heavier workpieces. For light DIY conveyor tables, SP12 or SP15 is a common starting point; for heavier industrial fixtures, SP22–SP30 is recommended. Check the housing outer diameter against your mounting hole before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the load capacity of each SP size?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLoad capacity scales with ball diameter. As a general guide, smaller units (SP8–SP12) handle light loads typically under 20 kg per unit, while larger units (SP22–SP30) can support significantly higher loads per unit. For exact rated load figures, please refer to the variant detail page or contact us to confirm specifications for your specific use case.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eWill the carbon steel version rust if used outdoors or in a damp environment?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eCarbon steel units are best suited for dry indoor environments. Exposure to moisture, humidity, or chemicals can cause surface oxidation over time. If your application involves washdown, outdoor exposure, or a humid workshop, select the 304 stainless steel variant, which offers significantly better corrosion resistance without requiring additional coatings.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eAre these ball transfer units compatible with standard conveyor table mounting holes?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — the SP series uses a standard countersunk flush-mount design compatible with most DIY and light-industrial conveyor table hole patterns. Verify the housing outer diameter of your chosen SP size matches the hole diameter in your table or fixture plate. If you are building a new table, drill holes to match the housing OD of your selected size.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eCan I mix carbon steel and stainless steel units on the same table?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, you can mix material types on the same surface. However, for consistent corrosion performance in humid or washdown environments, it is advisable to use all stainless steel units. Mixing materials in corrosive environments may result in galvanic interaction at contact points over time.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I install or replace the main ball in an SP unit?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe main ball in most SP-series units can be lifted out of the housing without tools for cleaning or replacement. Simply press the ball to one side of the housing rim and lift it free. Reseating is done by pressing the ball back into the housing until it seats against the inner ball array. No disassembly of the housing is required for routine maintenance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eWhat industries or projects are these ball transfer units best suited for?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSP ball transfer bearing units are widely used in DIY woodworking conveyor tables, CNC router material-staging fixtures, packaging and sorting lines, assembly workstations, 3D-printer enclosure sliding panels, and light-duty warehouse transfer stations. Any application requiring smooth, omnidirectional load movement across a flat surface is a strong candidate.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your size and material type above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right SP size for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the SP number to the main ball diameter in millimeters: SP8 = 8 mm, SP12 = 12 mm, SP15 = 15 mm, SP22 = 22 mm, SP25 = 25 mm, SP30 = 30 mm. Larger balls support higher loads and suit heavier workpieces. For light DIY conveyor tables, SP12 or SP15 is a common starting point; for heavier industrial fixtures, SP22–SP30 is recommended.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the load capacity of each SP size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Load capacity scales with ball diameter. Smaller units (SP8–SP12) handle light loads typically under 20 kg per unit, while larger units (SP22–SP30) can support significantly higher loads. Contact us to confirm exact rated load figures for your use case.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will the carbon steel version rust if used outdoors or in a damp environment?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Carbon steel units are best suited for dry indoor environments. For washdown, outdoor, or humid applications, select the 304 stainless steel variant for better corrosion resistance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these ball transfer units compatible with standard conveyor table mounting holes?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — the SP series uses a standard countersunk flush-mount design compatible with most DIY and light-industrial conveyor table hole patterns. Verify the housing outer diameter of your chosen SP size matches the hole diameter in your table or fixture plate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I mix carbon steel and stainless steel units on the same table?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, you can mix material types on the same surface. For consistent corrosion performance in humid or washdown environments, using all stainless steel units is advisable.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I install or replace the main ball in an SP unit?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The main ball can be lifted out of the housing without tools for cleaning or replacement. Press the ball to one side of the housing rim and lift it free. Reseat by pressing the ball back until it seats against the inner ball array.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What industries or projects are these ball transfer units best suited for?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"SP ball transfer bearing units are widely used in DIY woodworking conveyor tables, CNC router material-staging fixtures, packaging and sorting lines, assembly workstations, 3D-printer enclosure sliding panels, and light-duty warehouse transfer stations.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"SP8, Carbon Steel","offer_id":52409584124178,"sku":"WJT0888-0","price":4.07,"currency_code":"USD","in_stock":true},{"title":"SP12, Carbon Steel","offer_id":52409584156946,"sku":"WJT0888-1","price":4.07,"currency_code":"USD","in_stock":true},{"title":"SP15, Carbon Steel","offer_id":52409584189714,"sku":"WJT0888-2","price":4.61,"currency_code":"USD","in_stock":true},{"title":"SP22, Carbon Steel","offer_id":52409584222482,"sku":"WJT0888-3","price":10.0,"currency_code":"USD","in_stock":true},{"title":"SP25, Carbon Steel","offer_id":52409584255250,"sku":"WJT0888-4","price":12.36,"currency_code":"USD","in_stock":true},{"title":"SP30, Carbon Steel","offer_id":52409584288018,"sku":"WJT0888-5","price":17.53,"currency_code":"USD","in_stock":true},{"title":"SP8, 304 Stainless Steel","offer_id":52409584320786,"sku":"WJT0888-6","price":8.83,"currency_code":"USD","in_stock":true},{"title":"SP12, 304 Stainless Steel","offer_id":52409584353554,"sku":"WJT0888-7","price":6.51,"currency_code":"USD","in_stock":true},{"title":"SP15, 304 Stainless Steel","offer_id":52409584386322,"sku":"WJT0888-8","price":6.92,"currency_code":"USD","in_stock":true},{"title":"SP22, 304 Stainless Steel","offer_id":52409584419090,"sku":"WJT0888-9","price":15.08,"currency_code":"USD","in_stock":true},{"title":"SP25, 304 Stainless Steel","offer_id":52409584451858,"sku":"WJT0888-10","price":18.29,"currency_code":"USD","in_stock":true},{"title":"SP30, 304 Stainless Steel","offer_id":52409584484626,"sku":"WJT0888-11","price":26.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of7_004cd020-6a8b-4afc-91a7-58329bb3a4f9.jpg?v=1782191126","url":"https:\/\/homediyer.com\/products\/sp8-sp30-ball-transfer-bearing-unit-conveyor-roller","provider":"HomeDIYer","version":"1.0","type":"link"}