{"title":"Inner Diameter - 21.5mm","description":"\u003ch1\u003e21.5mm\u003c\/h1\u003e\u003ch2\u003e21.5mm Online shopping\u003c\/h2\u003e","products":[{"product_id":"mr3121-2rs-full-complement-full-ceramic-bear","title":"MR3121-2RS Full Complement Full Ceramic Bearing 21.5x31x7 ZrO2 Bearing","description":"\u003ccenter\u003e\n\u003ctable cellspacing=\"2\" cellpadding=\"10\" bg=\"\" border=\"1\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd align=\"center\"\u003e\u003cfont face=\"Tahoma\" size=\"+2\"\u003eMR3121-2RS Full Complement Ceramic Sealed Ball Bearing\u003cbr\u003e Zirconia\u003cbr\u003e 21.5mm x 31mm x 7mm\u003c\/font\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cbr\u003e\u003cbr\u003e\u003ctable cellspacing=\"2\" cellpadding=\"5\" bg=\"\" border=\"0\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003e\u003ctable cellspacing=\"3\" cellpadding=\"5\" bg=\"\" border=\"0\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003ctd valign=\"center\" align=\"middle\"\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd valign=\"center\" align=\"middle\"\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" align=\"left\"\u003e\n\u003cp align=\"justify\"\u003e\u003cfont face=\"tahoma\"\u003eMR3121-2RS Full Complement Ceramic sealed Ball Bearing, measures an inner diameter of 21.5mm, outer diameter is 31mm and the width is 7mm, Bearing is made from ZrO2 Ceramic Zirconium oxide.\u003c\/font\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eMR3121-2RS Ball Bearing\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eFull Complement Ceramic Ball Bearing\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eCage: No Cage\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eBalls: ZRO2 Ceramic\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eClosures: PTFE covers\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eInner\/outer races:ZRO2 Ceramic\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eDimensions: 21.5 mm x 31mm x 7mm\/Metric\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eID (inner diameter)\/Bore: 21.5mm\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eOD (outer diameter): 31mm\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eWidth: 7mm\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eSize:21.5 x 31 x 7 mm\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eQuantity:One Bearing\u003c\/font\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/center\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003ccenter\u003e\u003c\/center\u003e 🤔","brand":"VXB","offers":[{"title":"Default Title","offer_id":44718175813830,"sku":"Kit8448","price":53.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0685\/7375\/7638\/files\/mr3121-2rs-full-complement-ceramic-bearing-21-5x31x7-zro2-bearings-vxb-ball-bearings.jpg?v=1785752368"},{"product_id":"smr31215-2rs-ceramic-bearing-215x31x7-si3n4","title":"SMR3121.5-2RS Ceramic Bearing 21.5x31x7 Si3N4 PTFE ABEC-5 Bearing","description":"\u003ccenter\u003e\n\u003ctable cellspacing=\"2\" cellpadding=\"10\" bg=\"\" border=\"1\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd align=\"center\"\u003e\u003cfont face=\"Tahoma\" size=\"+2\"\u003e21.5 x 31 x 7 Stainless Steel Premium ABEC-5 Ball Bearing\u003cbr\u003e Silicon Nitride Ceramic Balls\u003cbr\u003e 2 PTFE Seals\u003c\/font\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cbr\u003e\u003cbr\u003e\u003ctable cellspacing=\"2\" cellpadding=\"10\" bg=\"\" border=\"0\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd valign=\"center\" align=\"center\" width=\"15%\"\u003e\u003ctable cellspacing=\"3\" cellpadding=\"5\" bg=\"\" border=\"0\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003ctd valign=\"center\" align=\"center\"\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd valign=\"center\" align=\"center\"\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/td\u003e\n\u003ctd align=\"left\" valign=\"top\" width=\"75%\"\u003e\n\u003cp align=\"justify\"\u003e\u003cfont face=\"tahoma\"\u003e21.5 x 31 x 7 Stainless Steel Premium ABEC-5 Ball Bearing, Silicon Nitride ceramic balls, inner diameter is 21.5mm, outer diameter is 31mm and width is 7mm.\u003c\/font\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003e21.5 x 31 x 7 Ball Bearing\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eDeep Groove Radial Ball Bearing\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eClosures: PTFE Sealed\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eQuality: Premium ABEC-5\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eMaterial: Stainless Steel\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eBalls: Silicon Nitride Ceramic (Si3N4)\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eLubrication: Self Lubricated (Grease SRL) Bearing\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eDimensions: 21.5mm x 31mm x 7mm\/Metric\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eID (inner diameter)\/Bore: 21.5mm\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eOD (outer diameter): 31mm\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eWidth: 7mm\u003c\/font\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cfont face=\"tahoma\"\u003eQuantity: 1 Bearing\u003c\/font\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/center\u003e\u003c!--Beginning HYBRID CERAMIC BEARINGS--\u003e\u003cp\u003e\u003cbr\u003e\u003csmall\u003e\u003cem\u003eVXB Category: Hybrid ceramic bearings\u003c\/em\u003e\u003c\/small\u003e\u003cbr\u003e\u003c!--Ending HYBRID CERAMIC BEARINGS--\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cbr\u003e\u003ch3\u003e\u003c\/h3\u003e 🤔","brand":"VXB","offers":[{"title":"Default Title","offer_id":44718285684934,"sku":"Kit11865","price":32.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0685\/7375\/7638\/files\/smr3121-5-2rs-ceramic-bearing-21-5x31x7-si3n4-ptfe-abec-5-bearings-vxb-ball-bearings.jpg?v=1785757173"},{"product_id":"smr31215-ceramic-bearing-215mm-metric-sealed","title":"SMR3121.5 Ceramic Bearing 21.5mm Metric Sealed ABEC-5 Bearing","description":"\u003ccenter\u003e\n\u003ctable cellspacing=\"2\" cellpadding=\"10\" bg=\"\" border=\"1\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd align=\"Center\"\u003e\u003cfont face=\"Tahoma\" size=\"+2\"\u003eSMR3121.5 Premium ABEC-5 Stainless Steel Ball Bearing\u003cbr\u003eSilicon Nitride Ceramic Balls\u003cbr\u003e 21.5 x 31 x 7 mm\u003c\/font\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cbr\u003e\u003cbr\u003e\u003ctable cellspacing=\"2\" cellpadding=\"5\" bg=\"\" border=\"1\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd valign=\"center\" align=\"Center\" width=\"\"\u003e\u003ctable cellspacing=\"3\" cellpadding=\"5\" bg=\"\" border=\"0\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd valign=\"center\" align=\"Center\"\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/td\u003e\n\u003ctd align=\"left\" valign=\"top\" width=\"\"\u003e\u003cfont face=\"tahoma\"\u003e\u003cp align=\"justify\"\u003eSMR3121.5 Premium ABEC-5 Stainless Steel Ball Bearing, bearing is Silicon Nitride ceramic ball.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSMR3121.5 Ball Bearing\u003c\/li\u003e\n\u003cli\u003eQuality: Premium ABEC-5\u003c\/li\u003e\n\u003cli\u003eClosures: Open\u003c\/li\u003e\n\u003cli\u003eMaterial: Stainless Steel \u003c\/li\u003e\n\u003cli\u003eBalls: Silicon Nitride Ceramic (Si3N4) \u003c\/li\u003e\n\u003cli\u003eDimensions: 21.5mm x 31mm x 7mm\/Metric\u003c\/li\u003e\n\u003cli\u003eID (inner diameter)\/Bore: 21.5mm\u003c\/li\u003e\n\u003cli\u003eOD (outer diameter): 31mm\u003c\/li\u003e\n\u003cli\u003eWidth: 7mm\u003c\/li\u003e\n\u003cli\u003eDimensions: 21.5 x 31 x 7 mm\u003c\/li\u003e\n\u003cli\u003eQuantity: 1 Bearing \u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/font\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/center\u003e\u003c!--Beginning HYBRID CERAMIC BEARINGS--\u003e\u003cbr\u003e\u003csmall\u003e\u003ci\u003eVXB Category: Hybrid ceramic bearings\u003c\/i\u003e\u003c\/small\u003e\u003cbr\u003e\u003c!--Ending HYBRID CERAMIC BEARINGS--\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003ch3\u003e\u003c\/h3\u003e 🤔","brand":"VXB","offers":[{"title":"Default Title","offer_id":44718322942150,"sku":"Kit13043","price":32.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0685\/7375\/7638\/files\/smr3121-5-ceramic-bearing-21-5mm-metric-sealed-abec-5-bearings-vxb-ball-bearings-1.jpg?v=1785756778"},{"product_id":"215317-2rs-sealed-bearing-215x31x7-metric","title":"Premium 215317-2RS Sealed Ball Bearing 21.5X31X7mm Metric Chrome Steel For Heavy Duty Machinery And Motors With Dual Rubber Dust Seals To Keep Grit Out","description":"\u003cdiv\u003e\n\u003cp\u003eMetric sealed radial ball bearing unit 21.5mm x 31mm x 7mm\u003cbr\u003e✔️ Chrome steel construction double rs seals grease lub emq\u003c\/p\u003e \u003cp\u003eThis sealed radial bearing protects inner surfaces from contaminants during operation.\u003c\/p\u003e \u003cp\u003e✅ Precise inner diameter matches shaft requirements perfectly\u003cbr\u003e✅ Narrow 7mm width allows tight space mounting installations\u003cbr\u003e✅ Grease lubrication ensures extended service life periods\u003cbr\u003e✅ Electric motor quality rating handles speed variations well\u003c\/p\u003e \u003cp\u003e💡 Why choose sealed ball bearings for wet environment tasks?\u003cbr\u003eRubber seals shield against moisture entry preventing rust formations internally\u003cbr\u003ePre-lubricated grease maintains friction levels without extra oil needed often\u003cbr\u003eLong lasting performance reduces downtime costs significantly for operators\u003c\/p\u003e✝️ \u003cbr\u003e \u003ctable cellspacing=\"2\" cellpadding=\"10\" bg border=\"1\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd align=\"center\"\u003e\u003cfont face=\"Tahoma\" size=\"+2\"\u003e215317-2RS Sealed Ball Bearing\u003cbr\u003e21.5mm x 31mm x 7mm\u003c\/font\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e \u003cbr\u003e \u003ctable cellspacing=\"2\" cellpadding=\"5\" width=\"85%\" bg border=\"0\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd align=\"center\" valign=\"center\"\u003e\u003ctable cellspacing=\"3\" cellpadding=\"5\" bg border=\"0\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd valign=\"center\" align=\"Center\"\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e","brand":"VXB","offers":[{"title":"Default Title","offer_id":44718661042374,"sku":"Kit21084","price":43.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0685\/7375\/7638\/files\/215317-2rs-sealed-bearing-21-5x31x7-metric-vxb-ball-bearings-1.jpg?v=1785754628"},{"product_id":"mr31215-full-ceramic-bearing-215x31x7mm-id-b","title":"MR3121.5 Full Ceramic Bearing 21.5x31x7mm ID Bore 21.5mm","description":"\u003ccenter\u003e\n\u003ctable cellspacing=\"2\" cellpadding=\"10\" bg=\"\" border=\"1\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd align=\"Center\"\u003e\u003cfont face=\"Tahoma\" size=\"+2\"\u003e6804 Modified Ball Bearing\u003cbr\u003eFull Ceramic\u003cbr\u003e21.5mm x 31mm x 7mm\u003c\/font\u003e\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cbr\u003e\u003cbr\u003e\u003ctable cellspacing=\"2\" cellpadding=\"5\" width=\"80%\" bg=\"\" border=\"0\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd align=\"center\" valign=\"center\"\u003e\u003ctable cellspacing=\"3\" cellpadding=\"5\" bg=\"\" border=\"0\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003ctd valign=\"center\" align=\"middle\"\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd valign=\"center\" align=\"middle\"\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/td\u003e\n\u003ctd valign=\"top\" align=\"left\"\u003e\u003cfont face=\"tahoma\"\u003e\u003cp align=\"justify\"\u003e Full Ceramic Ball Bearing, measures an inner diameter of 21.5mm, outer diameter is 31mm and the width is 7mm, a standard bearing size commonly used in a variety of industrial and commercial applications, Bearing is made from Ceramic. \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e6804 Modified Ball bearing\u003c\/li\u003e\n\u003cli\u003eFull Ceramic Ball Bearing\u003c\/li\u003e\n\u003cli\u003eBalls: Made from Zirconia Ceramic (ZrO₂)\u003c\/li\u003e\n\u003cli\u003eCage Material: PTFE (Polytetrafluoroethylene)\u003c\/li\u003e\n\u003cli\u003eRaces Material: Zirconia (ZrO₂) Ceramic \u003c\/li\u003e\n\u003cli\u003eDimensions: 21.5mm x 31mm x 7mm\/Metric\u003c\/li\u003e\n\u003cli\u003eID (inner diameter)\/Bore: 21.5mm\u003c\/li\u003e\n\u003cli\u003eOD (outer diameter): 31mm\u003c\/li\u003e\n\u003cli\u003eWidth: 7mm\u003c\/li\u003e\n\u003cli\u003eSize: 21.5 x 31 x 7 mm\u003c\/li\u003e\n\u003cli\u003eQuantity: One ball bearing\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/font\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/center\u003e\u003c!--Beginning FULL CERAMIC BEARINGS--\u003e\u003cbr\u003e\u003csmall\u003e\u003ci\u003eVXB Category: Full ceramic bearings\u003c\/i\u003e\u003c\/small\u003e\u003cbr\u003e\u003c!--Ending FULL CERAMIC BEARINGS--\u003e\u003cbr\u003e\u003cbr\u003e 🤔","brand":"VXB","offers":[{"title":"Default Title","offer_id":44718987575494,"sku":"Kit7757","price":53.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0685\/7375\/7638\/files\/mr3121-5-full-ceramic-bearing-21-5x31x7-vxb-ball-bearings.jpg?v=1785752655"}],"url":"https:\/\/bearings.net\/collections\/inner-diameter-21-5mm.oembed","provider":"Bearings.net","version":"1.0","type":"link"}