{"product_id":"na4900-na4919-needle-roller-bearing-with-inner-ring-drawn-cup-bearings","title":"NA4900 - NA4919 Needle Roller Bearing with Inner Ring Drawn Cup Bearings","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eNA4900–NA4919 Needle Roller Bearings with Inner Ring — Compact Radial Load Solutions\u003c\/h2\u003e\n    \u003cp\u003eWhen space is tight but load demands are high, engineers and DIY builders alike need a bearing that delivers without bulk. The NA4900–NA4919 series drawn cup needle roller bearings with inner ring are engineered for applications where radial space is limited — making them a go-to choice for automotive transmission components, industrial gearboxes, and precision machinery assemblies.\u003c\/p\u003e\n    \u003cp\u003eEach bearing in this series features a drawn cup outer ring combined with a machined inner ring, providing a complete, ready-to-install unit. The rolling elements are needle rollers — cylindrical rollers with a high length-to-diameter ratio — enabling a high load capacity relative to the bearing's compact cross-section. Available sizes span from NA4900 (ID 10mm \/ 0.394\" × OD 22mm \/ 0.866\" × Height 13mm \/ 0.512\") through NA4919 (ID 95mm \/ 3.740\" × OD 130mm \/ 5.118\" × Height 35mm \/ 1.378\"), covering a wide range of shaft diameters from 10mm to 95mm (approximately 0.39\" to 3.74\").\u003c\/p\u003e\n    \u003cp\u003eThese bearings are widely used in automotive driveline and transmission rebuilds, industrial conveyor and gearbox assemblies, and precision CNC machine tool spindles — anywhere a compact radial bearing with an integrated inner ring is required for reliable shaft support.\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 shaft diameters from 10mm to 95mm (0.39\"–3.74\"). Verify your shaft diameter and housing bore against the selected variant's ID × OD × Height dimensions before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Needle Roller Bearings with Inner Ring\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eCompact Cross-Section Design\u003c\/strong\u003e — Needle roller geometry maximizes radial load capacity within a minimal radial envelope, ideal for space-constrained housings.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eIntegrated Inner Ring\u003c\/strong\u003e — The machined inner ring allows direct shaft mounting without requiring a hardened shaft surface, simplifying installation and reducing prep time.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eDrawn Cup Outer Ring\u003c\/strong\u003e — The thin-walled drawn cup outer ring fits directly into a standard housing bore, eliminating the need for a separate outer race machining step.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏋️\u003c\/span\u003e\u003cstrong\u003eHigh Radial Load Capacity\u003c\/strong\u003e — The high number of needle rollers in contact with the raceways delivers a dynamic load rating well above comparably sized ball bearings of the same envelope.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eWide Size Range (NA4900–NA4919)\u003c\/strong\u003e — 20 size variants covering shaft IDs from 10mm to 95mm let you source the exact bearing for your application from a single product listing.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eDrop-In Replacement Compatibility\u003c\/strong\u003e — Dimensioned to ISO\/JIS NA49 series standards, ensuring interchangeability with OEM and aftermarket bearings of the same designation.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ch2\u003e📐 Technical Specifications — Needle Roller Bearing\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eBearing Series\u003c\/th\u003e\n\u003ctd\u003eNA4900 – NA4919\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eBearing Type\u003c\/th\u003e\n\u003ctd\u003eDrawn Cup Needle Roller Bearing with Inner Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eInner Diameter (ID)\u003c\/th\u003e\n\u003ctd\u003e10mm – 95mm (0.394\" – 3.740\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e22mm – 130mm (0.866\" – 5.118\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eHeight \/ Width\u003c\/th\u003e\n\u003ctd\u003e13mm – 35mm (0.512\" – 1.378\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eVariant Sizes\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial — Rolling Elements\u003c\/th\u003e\n\u003ctd\u003eBearing steel (typically GCr15 equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial — Inner Ring\u003c\/th\u003e\n\u003ctd\u003eBearing steel, hardened and ground\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial — Outer Cup\u003c\/th\u003e\n\u003ctd\u003eCase-hardened drawn steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCage Type\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eGrease-lubricated (relubrication recommended for extended service)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOperating Temperature Range\u003c\/th\u003e\n\u003ctd\u003eTypically –20°C to +120°C (–4°F to +248°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eLoad Direction\u003c\/th\u003e\n\u003ctd\u003eRadial only\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eStandard\u003c\/th\u003e\n\u003ctd\u003eISO \/ JIS NA49 series\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWeight\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 NA49 series bearing size for my shaft?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the bearing's Inner Diameter (ID) to your shaft diameter. For example, if your shaft is 25mm, select NA4905 (25×42×17). Then confirm the Outer Diameter (OD) fits your housing bore and the Height fits your available axial space. All dimensions are listed in each variant name in the format ID×OD×Height (mm).\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these bearings handle axial (thrust) loads?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNo — drawn cup needle roller bearings are designed exclusively for radial loads. They have no axial load capacity. If your application involves combined radial and axial loads, you will need to pair this bearing with a separate thrust bearing or select a different bearing type such as a combined needle\/thrust bearing.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need a hardened shaft to use these bearings?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eNo. Because this series includes an integrated inner ring, the needle rollers run on the hardened inner ring surface rather than directly on the shaft. This means you can use a standard (non-hardened) shaft, which is one of the key advantages of the NA49 series over open-type needle roller bearings without an inner ring.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these bearings corrosion-resistant?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStandard NA49 series bearings are made from bearing steel and are not inherently corrosion-resistant. For environments with moisture, mild chemicals, or wash-down conditions, apply a compatible bearing grease with corrosion-inhibiting properties and consider re-greasing intervals. For highly corrosive environments, contact us to confirm suitability or explore stainless-steel alternatives.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between NA4900 and RNA4900 bearings?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe NA49 series includes an inner ring (hence the \"A\" designation), allowing direct shaft mounting on a standard shaft. The RNA49 series does not include an inner ring and requires a hardened, precision-ground shaft surface to act as the inner raceway. If your shaft is already hardened and ground to the correct tolerance, RNA49 may be used; otherwise, NA49 is the correct choice.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat lubrication should I use and how often should I re-grease?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese bearings are typically supplied with an initial grease fill. For most applications, use a lithium-based or polyurea-based bearing grease with an NLGI grade 2 consistency. Re-greasing intervals depend on operating speed, temperature, and load — as a general guideline, re-grease every 500–2,000 operating hours. Consult your application's service manual for specific intervals.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these bearings interchangeable with other brands' NA49 series?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The NA4900–NA4919 series is dimensioned to ISO\/JIS NA49 standards, making them dimensionally interchangeable with equivalently designated bearings from other manufacturers. Always verify the ID, OD, and Height dimensions match your existing bearing before installation.\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 (ID × OD × Height) 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 NA49 series bearing size for my shaft?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the bearing's Inner Diameter (ID) to your shaft diameter. For example, if your shaft is 25mm, select NA4905 (25×42×17). Then confirm the Outer Diameter (OD) fits your housing bore and the Height fits your available axial space.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these bearings handle axial (thrust) loads?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No — drawn cup needle roller bearings are designed exclusively for radial loads. They have no axial load capacity. Pair with a separate thrust bearing if axial loads are present.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need a hardened shaft to use these bearings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. The integrated inner ring means needle rollers run on the hardened inner ring surface, not directly on the shaft. A standard non-hardened shaft is sufficient.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bearings corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Standard NA49 bearings are bearing steel and not inherently corrosion-resistant. Use corrosion-inhibiting grease and maintain re-greasing intervals for moist or chemical environments.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between NA4900 and RNA4900 bearings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"NA49 includes an inner ring for use on standard shafts. RNA49 has no inner ring and requires a hardened, precision-ground shaft surface as the inner raceway.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What lubrication should I use and how often should I re-grease?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Use NLGI grade 2 lithium-based or polyurea-based bearing grease. Re-grease every 500–2,000 operating hours depending on speed, temperature, and load conditions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these bearings interchangeable with other brands' NA49 series?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Dimensioned to ISO\/JIS NA49 standards, they are dimensionally interchangeable with equivalently designated bearings from other manufacturers. Always verify ID, OD, and Height before installation.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"NA4900 - 10x22x13","offer_id":52448987021586,"sku":"GLFBNHHSHXJZC0929x1","price":2.43,"currency_code":"USD","in_stock":true},{"title":"NA4901 - 12x24x13","offer_id":52448987054354,"sku":"GLFBNHHSHXJZC0930x1","price":2.43,"currency_code":"USD","in_stock":true},{"title":"NA4902 - 15x28x13","offer_id":52448987087122,"sku":"GLFBNHHSHXJZC0931x1","price":2.71,"currency_code":"USD","in_stock":true},{"title":"NA4903 - 17x30x13","offer_id":52448987119890,"sku":"GLFBNHHSHXJZC0932x1","price":2.84,"currency_code":"USD","in_stock":true},{"title":"NA4904 - 20x37x17","offer_id":52448987152658,"sku":"GLFBNHHSHXJZC0933x1","price":4.69,"currency_code":"USD","in_stock":true},{"title":"NA4905 - 25x42x17","offer_id":52448987185426,"sku":"GLFBNHHSHXJZC0934x1","price":5.37,"currency_code":"USD","in_stock":true},{"title":"NA4906 - 30x47x17","offer_id":52448987218194,"sku":"GLFBNHHSHXJZC0935x1","price":5.51,"currency_code":"USD","in_stock":true},{"title":"NA4907 - 35x55x20","offer_id":52448987250962,"sku":"GLFBNHHSHXJZC0936x1","price":8.83,"currency_code":"USD","in_stock":true},{"title":"NA4908 - 40x62x22","offer_id":52448987283730,"sku":"GLFBNHHSHXJZC0937x1","price":11.08,"currency_code":"USD","in_stock":true},{"title":"NA4909 - 45x68x22","offer_id":52448987316498,"sku":"GLFBNHHSHXJZC0938x1","price":13.04,"currency_code":"USD","in_stock":true},{"title":"NA4910 - 50x72x22","offer_id":52448987349266,"sku":"GLFBNHHSHXJZC0939x1","price":12.5,"currency_code":"USD","in_stock":true},{"title":"NA4911 - 55x80x25","offer_id":52448987382034,"sku":"GLFBNHHSHXJZC0940x1","price":19.84,"currency_code":"USD","in_stock":true},{"title":"NA4912 - 60x85x25","offer_id":52448987414802,"sku":"GLFBNHHSHXJZC0941x1","price":19.52,"currency_code":"USD","in_stock":true},{"title":"NA4913 - 65x90x25","offer_id":52448987447570,"sku":"GLFBNHHSHXJZC0942x1","price":22.92,"currency_code":"USD","in_stock":true},{"title":"NA4914 - 70x100x30","offer_id":52448987480338,"sku":"GLFBNHHSHXJZC0943x1","price":30.59,"currency_code":"USD","in_stock":true},{"title":"NA4915 - 75x105x30","offer_id":52448987513106,"sku":"GLFBNHHSHXJZC0944x1","price":34.53,"currency_code":"USD","in_stock":true},{"title":"NA4916 - 80x110x30","offer_id":52448987545874,"sku":"GLFBNHHSHXJZC0945x1","price":38.47,"currency_code":"USD","in_stock":true},{"title":"NA4917 - 85x120x35","offer_id":52448987578642,"sku":"GLFBNHHSHXJZC0946x1","price":51.53,"currency_code":"USD","in_stock":true},{"title":"NA4918 - 90x125x35","offer_id":52448987611410,"sku":"GLFBNHHSHXJZC0947x1","price":53.43,"currency_code":"USD","in_stock":true},{"title":"NA4919 - 95x130x35","offer_id":52448987644178,"sku":"GLFBNHHSHXJZC0948x1","price":57.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of7_f83041dd-8cba-42bf-b9af-2edfd77ab488.jpg?v=1783403861","url":"https:\/\/homediyer.com\/products\/na4900-na4919-needle-roller-bearing-with-inner-ring-drawn-cup-bearings","provider":"HomeDIYer","version":"1.0","type":"link"}