{"product_id":"301-series-mechanical-shaft-seal-water-circulation-pump","title":"301 Series Mechanical Shaft Seal for Water \u0026 Circulation Pumps","description":"\n\u003ch2\u003e301 Series Single Coil Spring Mechanical Shaft Seal\u003c\/h2\u003e\n\u003cp\u003eKeep your water pump running leak-free with this precision-engineered \u003cstrong\u003e301 Series Mechanical Shaft Seal\u003c\/strong\u003e. Designed for clean water pumps and circulation pumps, this single coil spring seal features a durable multi-material construction that ensures a reliable, long-lasting seal across a wide range of operating conditions. Available in shaft sizes \u003cstrong\u003e26, 28, 30, 36, 42, 45, and 50mm\u003c\/strong\u003e to fit a variety of pump configurations.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 301\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStationary Ring:\u003c\/strong\u003e Ceramic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRotary Ring:\u003c\/strong\u003e Carbon\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecondary Seal:\u003c\/strong\u003e Nitrile Rubber (NBR)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpring:\u003c\/strong\u003e Stainless Steel (single coil)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Shaft Diameters:\u003c\/strong\u003e 26 \/ 28 \/ 30 \/ 36 \/ 42 \/ 45 \/ 50mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -20°C to +100°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Pressure:\u003c\/strong\u003e ≤ 0.5 MPa\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Speed:\u003c\/strong\u003e ≤ 10 m\/s\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Clean water pumps, circulation pumps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Silicon \/ Ceramic \/ Carbon \/ NBR \/ Stainless Steel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose This Shaft Seal?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Material Build:\u003c\/strong\u003e Ceramic stationary ring and carbon rotary ring provide excellent wear resistance and extended service life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNBR Secondary Seal:\u003c\/strong\u003e Nitrile rubber offers strong resistance to water and common pump media, minimizing leakage risk.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStainless Steel Spring:\u003c\/strong\u003e Corrosion-resistant coil spring maintains consistent face pressure for a dependable seal.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Size Range:\u003c\/strong\u003e Seven shaft diameter options (26–50mm) make this seal suitable for a broad range of residential and industrial circulation pumps.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad Temperature Range:\u003c\/strong\u003e Performs reliably from -20°C to +100°C, handling both cold-water and hot-water circulation systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Mechanical Shaft Seal (301 Series)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePhotos are for reference only and may not reflect the actual size — please refer to the shaft diameter specifications listed above before purchasing.\u003c\/li\u003e\n  \u003cli\u003eMinor dimensional differences due to manual measurement are possible; please allow a small tolerance.\u003c\/li\u003e\n  \u003cli\u003eScreen color settings may cause slight variations between displayed and actual product color.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10pcs-2-pin-quick-splice-spring-wire-connectors-lock-terminals\"\u003e10pcs 2-Pin Spring Wire Connectors – Quick Splice Lock Terminals\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\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What shaft sizes does the 301 Series mechanical shaft seal fit?\u003c\/h4\u003e\n\u003cp\u003eA: This mechanical shaft seal is available in seven shaft diameter options: 26mm, 28mm, 30mm, 36mm, 42mm, 45mm, and 50mm. Please measure your pump's shaft diameter carefully before ordering to ensure the correct fit.\u003c\/p\u003e\n\u003ch4\u003eQ: What types of pumps is this shaft seal compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: The 301 Series shaft seal is designed for use with clean water pumps and circulation pumps. It is not recommended for use with abrasive or highly corrosive fluids beyond its rated media compatibility.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the maximum operating temperature and pressure for this seal?\u003c\/h4\u003e\n\u003cp\u003eA: This seal is rated for operating temperatures from -20°C to +100°C and pressures up to 0.5 MPa, making it suitable for both cold and hot water circulation systems in residential and light industrial applications.\u003c\/p\u003e\n\u003ch4\u003eQ: What materials are used in this mechanical shaft seal?\u003c\/h4\u003e\n\u003cp\u003eA: The stationary ring is ceramic, the rotary ring is carbon, the secondary seal is made of Nitrile Rubber (NBR), and the spring is stainless steel — all materials selected for durability, corrosion resistance, and long service life.\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 shaft sizes does the 301 Series mechanical shaft seal fit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This mechanical shaft seal is available in seven shaft diameter options: 26mm, 28mm, 30mm, 36mm, 42mm, 45mm, and 50mm. Please measure your pump's shaft diameter carefully before ordering to ensure the correct fit.\"}}, {\"@type\": \"Question\", \"name\": \"What types of pumps is this shaft seal compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The 301 Series shaft seal is designed for use with clean water pumps and circulation pumps. 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