{"product_id":"2pcs-mr3040-shaft-bearings-30x40x7-30x40x6-2rs-sealed-bearing-steel","title":"2PCS MR3040 Shaft Bearings 30x40x7 \u0026 30x40x6 – 2RS Sealed","description":"\n\u003ch2\u003e2PCS MR3040 Shaft Bearings – 30x40x7 \u0026amp; 30x40x6 (2RS Sealed)\u003c\/h2\u003e\n\u003cp\u003eGet precision-engineered bearing steel shaft bearings in a convenient 2-piece set. Whether you need the \u003cstrong\u003e30x40x7mm\u003c\/strong\u003e or the \u003cstrong\u003e30x40x6mm\u003c\/strong\u003e variant, these sealed miniature bearings deliver smooth, consistent rotation and long-lasting performance across a wide range of mechanical and DIY applications.\u003c\/p\u003e\n\n\u003cp\u003eManufactured from high-quality bearing steel, these double-rubber-sealed (2RS) bearings are designed to keep contaminants out and lubrication in — making them ideal for use in motors, robotics, RC vehicles, skateboards, precision machinery, and more.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ch4\u003eMR3040H7 \/ 30x40x7\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e 30mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 40mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 7mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeal Type:\u003c\/strong\u003e 2RS (Double Rubber Sealed)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Bearing Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Models:\u003c\/strong\u003e MR3040H7-2RS, 30406, 30407, 30426, 30427, 30467\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eMR3040H6 \/ 30x40x6\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e 30mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 40mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 6mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeal Type:\u003c\/strong\u003e 2RS (Double Rubber Sealed)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Bearing Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Models:\u003c\/strong\u003e MR3040H6, 30x42x6\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003ePremium Bearing Steel\u003c\/strong\u003e – High hardness and wear resistance for extended service life\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eDouble Rubber Seals (2RS)\u003c\/strong\u003e – Effectively blocks dust, debris, and moisture\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003ePre-Lubricated\u003c\/strong\u003e – Ready to install straight out of the box\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003ePrecise Dimensions\u003c\/strong\u003e – Consistent tolerances for smooth, low-vibration operation\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eVersatile Fit\u003c\/strong\u003e – Suitable for motors, 3D printers, RC models, industrial equipment, and more\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e2-Piece Set\u003c\/strong\u003e – Great value with two bearings per order\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× MR3040H7-2RS Bearing (30x40x7mm)\u003c\/li\u003e\n  \u003cli\u003e1× MR3040H6 Bearing (30x40x6mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10pcs-durable-gold-blade-nut-metal-universal-trimmer-accessories-anti-loosening-line-left-hand-thread-replacement-parts-1\"\u003e10pcs Durable Gold Blade Nut Metal Universal Trimmer Accessories\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/stainless-steel-self-tapping-screws-m2-2-m4-8-phillips-wood-hinge\"\u003e10PCS Stainless Steel Self-Tapping Screws M2.2–M4.8 Phillips\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/12pcs-16mm-momentary-push-button-switch-1no-metal-2-pin-self-reset\"\u003e12pcs 16mm Momentary Push Button Switch 1NO Metal 2-Pin Self-Reset\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does the \"2RS\" designation mean on these MR3040 bearings?\u003c\/h4\u003e\n\u003cp\u003eA: \"2RS\" stands for Double Rubber Sealed — both sides of the bearing are fitted with rubber seals. This design keeps grease inside and prevents dust, dirt, and moisture from entering the bearing, resulting in longer service life and more reliable performance in demanding environments.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are these bearings interchangeable with models 30406, 30407, 30426, 30427, and 30467?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The MR3040H7-2RS bearing (30x40x7mm) is compatible with a range of equivalent model numbers including 30406, 30407, 30426, 30427, and 30467. Always verify the inner diameter (30mm), outer diameter (40mm), and thickness (7mm) match your application before installing.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What applications are these 30x40 shaft bearings suitable for?\u003c\/h4\u003e\n\u003cp\u003eA: These miniature shaft bearings are widely used in 3D printers, RC cars and drones, electric motors, robotics, skateboards, bicycles, and various industrial or DIY machinery where a precise 30mm bore diameter is required.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Do these bearings come pre-lubricated and ready to install?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. Both the 30x40x7mm and 30x40x6mm bearings in this set are pre-greased and sealed, so they are ready to install immediately upon arrival without any additional lubrication needed.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the \\\"2RS\\\" designation mean on these MR3040 bearings?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"\\\"2RS\\\" stands for Double Rubber Sealed — both sides of the bearing are fitted with rubber seals. This design keeps grease inside and prevents dust, dirt, and moisture from entering the bearing, resulting in longer service life and more reliable performance in demanding environments.\"}}, {\"@type\": \"Question\", \"name\": \"Are these bearings interchangeable with models 30406, 30407, 30426, 30427, and 30467?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The MR3040H7-2RS bearing (30x40x7mm) is compatible with a range of equivalent model numbers including 30406, 30407, 30426, 30427, and 30467. Always verify the inner diameter (30mm), outer diameter (40mm), and thickness (7mm) match your application before installing.\"}}, {\"@type\": \"Question\", \"name\": \"What applications are these 30x40 shaft bearings suitable for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These miniature shaft bearings are widely used in 3D printers, RC cars and drones, electric motors, robotics, skateboards, bicycles, and various industrial or DIY machinery where a precise 30mm bore diameter is required.\"}}, {\"@type\": \"Question\", \"name\": \"Do these bearings come pre-lubricated and ready to install?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. Both the 30x40x7mm and 30x40x6mm bearings in this set are pre-greased and sealed, so they are ready to install immediately upon arrival without any additional lubrication needed.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/68k0rh-yt.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/68k0rh-yt.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"2PCS MR3040 Shaft Bearings 30x40x7 \u0026 30x40x6 – 2RS Sealed\", \"item\": \"https:\/\/68k0rh-yt.myshopify.com\/products\/2pcs-mr3040-shaft-bearings-30x40x7-30x40x6-2rs-sealed-bearing-steel\"}]}\u003c\/script\u003e","brand":"Richie's","offers":[{"title":"Steel Ball \/ 2pcs \/ 6806 2RS 30x42x7mm","offer_id":57605316214950,"sku":"1005009381571188-Steel Ball-2pcs-6806 2RS 30x42x7mm","price":20.15,"currency_code":"USD","in_stock":true},{"title":"Steel Ball \/ 2pcs \/ 30x40x7mm","offer_id":57605316247718,"sku":"1005009381571188-Steel Ball-2pcs-30x40x7mm","price":25.34,"currency_code":"USD","in_stock":true},{"title":"Steel Ball \/ 2pcs \/ 30x40x6mm","offer_id":57605316280486,"sku":"1005009381571188-Steel Ball-2pcs-30x40x6mm","price":25.34,"currency_code":"USD","in_stock":true},{"title":"Steel Ball \/ 2pcs \/ 30x46x7mm","offer_id":57605316313254,"sku":"1005009381571188-Steel Ball-2pcs-30x46x7mm","price":25.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0785\/2182\/7494\/files\/S351cd5702e2a473398688f8452a2aa41H_1e56a5d8-47cc-4d74-95c0-9a691573ba19.webp?v=1791724641","url":"https:\/\/richiesmart.com\/products\/2pcs-mr3040-shaft-bearings-30x40x7-30x40x6-2rs-sealed-bearing-steel","provider":"Richie's","version":"1.0","type":"link"}