{"product_id":"heavy-duty-bearing-casters-ball-transfer-bearing-unit-conveyor-roller-sp8-sp45","title":"Heavy Duty Bearing Casters Ball Transfer Bearing Unit Conveyor Roller SP8 - SP45","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBall Transfer Bearing Unit for Conveyor Rollers — Smooth, Reliable Multi-Directional Load Support\u003c\/h2\u003e\n\u003cp\u003eWhen your conveyor line, assembly table, or material-handling station demands frictionless, multi-directional movement, a worn or mismatched ball transfer unit becomes a costly bottleneck. Engineers, maintenance technicians, and DIY fabricators who need a dependable ball transfer bearing unit that handles real industrial loads without seizing or corroding will find exactly what they need here.\u003c\/p\u003e\n\u003cp\u003eEach ball transfer bearing unit consists of a hardened load ball seated in a precision-machined housing packed with recirculating bearing balls. Available in two materials — Bearing Steel for high-load, cost-effective applications and 304 Stainless Steel for corrosion-sensitive environments — and spanning eight model sizes from SP8 (8 mm \/ 0.31 in load ball) through SP45 (45 mm \/ 1.77 in load ball). Housing outer diameters range from approximately 22 mm (0.87 in) for SP8 up to approximately 105 mm (4.13 in) for SP45.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include gravity conveyor roller tables for warehouse order-picking lines, omni-directional transfer decks at production line merge points, and custom DIY workbench inserts for rotating heavy sheet-metal panels — all scenarios where a ball transfer unit conveyor roller must handle repeated cycling without lubrication downtime.\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 mounting holes for SP-series ball transfer units. Verify your panel bore diameter and load rating against the model size before ordering. Mixed-material packs are not available — select one material per order.\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\u003eEight Model Sizes (SP8–SP45)\u003c\/strong\u003e — Load ball diameters from 8 mm to 45 mm cover light-duty assembly jigs through heavy industrial conveyor decks, letting you match the unit precisely to your load and panel thickness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eDual Material Options\u003c\/strong\u003e — Bearing Steel variants deliver high radial load capacity at an accessible price point; 304 Stainless Steel variants resist oxidation and mild chemical exposure for food-adjacent or outdoor installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eFull 360° Multi-Directional Rolling\u003c\/strong\u003e — The recirculating inner ball array allows smooth load movement in any horizontal direction without repositioning, reducing manual handling effort on conveyor transfer points.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eHardened Load Ball Surface\u003c\/strong\u003e — The main load ball is surface-hardened to resist flat-spotting under repeated static and dynamic loads, extending service life on high-cycle conveyor roller applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities (1–10 pcs)\u003c\/strong\u003e — Order a single unit for a repair job or up to 10 pieces per pack for a full conveyor deck build-out, with per-unit pricing that scales with quantity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eDrop-In Panel Mount Design\u003c\/strong\u003e — The flanged housing seats flush into a standard counterbored hole; no special tooling required beyond a drill press and the correct hole saw for your chosen model size.\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 Unit\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\u003eModel Range\u003c\/th\u003e\n\u003ctd\u003eSP8, SP12, SP15, SP22, SP25, SP30, SP38, SP45\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLoad Ball Diameter\u003c\/th\u003e\n\u003ctd\u003e8 mm – 45 mm (0.31 in – 1.77 in), see 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 Hole Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial Options\u003c\/th\u003e\n\u003ctd\u003eBearing Steel \/ 304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBall Array Type\u003c\/th\u003e\n\u003ctd\u003eRecirculating inner bearing balls\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLoad Direction\u003c\/th\u003e\n\u003ctd\u003eMulti-directional (360° horizontal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStatic Load Capacity\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDynamic Load Capacity\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003ctd\u003eStandard (Bearing Steel) \/ Corrosion-resistant (304 SS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 4 \/ 5 \/ 8 \/ 10 pcs per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight per Unit\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\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right model size (SP8 vs SP12 vs SP15, etc.)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the model based on two factors: the load per unit and your panel thickness. Larger SP numbers indicate a bigger load ball and higher load capacity. As a general rule, measure the maximum weight that will rest on a single unit, divide by the number of units in your array, then choose the model whose rated static load exceeds that figure. Your panel thickness also determines the minimum housing depth — confirm the counterbore depth matches the housing height for your chosen model.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between Bearing Steel and 304 Stainless Steel variants?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBearing Steel (typically GCr15 \/ 52100 equivalent) offers higher hardness and load capacity at a lower cost, making it ideal for dry indoor conveyor lines and assembly tables. 304 Stainless Steel resists surface rust and mild chemical exposure, making it the better choice for washdown environments, outdoor installations, or anywhere moisture is present. If in doubt about your environment, choose 304 Stainless Steel.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these ball transfer units support vertical or angled loads?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese units are designed primarily for horizontal surface mounting where the load presses down onto the load ball. They are not rated for vertical-mount or inverted applications. For angled conveyor decks, ensure the resultant load vector remains within the manufacturer's specified cone angle — typically within 30° of vertical — to avoid premature wear on the inner ball array.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these units require lubrication or maintenance?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMost SP-series ball transfer units are pre-lubricated at the factory and sealed for life under normal operating conditions. For high-cycle or high-load applications, periodic re-lubrication through the grease nipple (if present on your model) is recommended. Bearing Steel units should be kept dry and free of corrosive fluids; 304 Stainless Steel units tolerate occasional moisture but should still be wiped down after washdown cycles.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard SP-series mounting hole patterns?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These units follow the SP-series dimensional standard, so they are interchangeable with other SP-series ball transfer units of the same model number. Always verify the counterbore diameter and depth for your specific model before drilling, as dimensions vary between SP8 and SP45. Contact us to confirm exact hole dimensions if you are retrofitting an existing panel.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many units do I need for my conveyor table?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA common rule of thumb is to space ball transfer units on a grid of 75–150 mm (3–6 in) center-to-center, depending on the size and rigidity of the items being conveyed. Divide the total load by the number of units to ensure each unit stays within its rated capacity. For a standard 600 × 1200 mm (24 × 48 in) transfer table, 20–40 units of SP12 or SP15 are typical for loads up to 50 kg per item.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I mix Bearing Steel and 304 Stainless Steel units in the same array?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMechanically, yes — the housing dimensions are identical for the same model number regardless of material. However, mixing materials in a corrosive or washdown environment is not recommended, as galvanic interaction between dissimilar metals can accelerate corrosion on the Bearing Steel units. For consistent performance and longevity, use the same material throughout a single installation.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your model size, material, and pack quantity 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 model size (SP8 vs SP12 vs SP15, etc.)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select the model based on two factors: the load per unit and your panel thickness. Larger SP numbers indicate a bigger load ball and higher load capacity. Measure the maximum weight per unit, then choose the model whose rated static load exceeds that figure. Confirm the counterbore depth matches the housing height for your chosen model.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between Bearing Steel and 304 Stainless Steel variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bearing Steel offers higher hardness and load capacity at a lower cost, ideal for dry indoor conveyor lines. 304 Stainless Steel resists rust and mild chemical exposure, better for washdown environments or anywhere moisture is present.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these ball transfer units support vertical or angled loads?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These units are designed for horizontal surface mounting. They are not rated for vertical-mount or inverted applications. For angled decks, ensure the load vector stays within approximately 30° of vertical.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these units require lubrication or maintenance?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Most SP-series units are pre-lubricated and sealed for life under normal conditions. For high-cycle applications, periodic re-lubrication is recommended if a grease nipple is present. Keep Bearing Steel units dry; 304 SS units tolerate moisture but should be wiped after washdown.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these compatible with standard SP-series mounting hole patterns?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, these follow the SP-series dimensional standard and are interchangeable with other SP-series units of the same model number. Always verify counterbore diameter and depth before drilling.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How many units do I need for my conveyor table?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Space units on a 75–150 mm (3–6 in) center-to-center grid depending on item size. For a standard 600 × 1200 mm transfer table, 20–40 units of SP12 or SP15 are typical for loads up to 50 kg per item.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I mix Bearing Steel and 304 Stainless Steel units in the same array?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Mechanically yes, as housing dimensions are identical for the same model number. However, mixing materials in corrosive environments is not recommended due to potential galvanic interaction. Use the same material throughout a single installation for best results.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"SP8 \/ Bearing Steel \/ 1","offer_id":52409588351250,"sku":"GLFBQLPGLBZSJ057255x1","price":4.07,"currency_code":"USD","in_stock":true},{"title":"SP8 \/ Bearing Steel \/ 2","offer_id":52409588384018,"sku":"GLFBQLPGLBZSJ057255x2","price":6.65,"currency_code":"USD","in_stock":true},{"title":"SP8 \/ Bearing Steel \/ 3","offer_id":52409588416786,"sku":"GLFBQLPGLBZSJ057255x3","price":9.59,"currency_code":"USD","in_stock":true},{"title":"SP8 \/ Bearing Steel \/ 4","offer_id":52409588449554,"sku":"GLFBQLPGLBZSJ057255x4","price":12.5,"currency_code":"USD","in_stock":true},{"title":"SP8 \/ Bearing Steel \/ 5","offer_id":52409588482322,"sku":"GLFBQLPGLBZSJ057255x5","price":15.44,"currency_code":"USD","in_stock":true},{"title":"SP8 \/ Bearing Steel \/ 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