{"product_id":"20pcs-nbr-o-ring-seals-cs3-1mm-od31-40mm-nitrile-gasket-rings","title":"20PCS NBR O-Ring Seals CS3.1mm OD 31–40mm Nitrile Gasket","description":"\u003ch2\u003e20-Pack NBR Nitrile O-Ring Seals — CS 3.1mm | OD 31–40mm\u003c\/h2\u003e\n\u003cp\u003eKeep your plumbing, hydraulic, pneumatic, and mechanical systems leak-free with these heavy-duty \u003cstrong\u003eNBR (Nitrile Butadiene Rubber) O-Ring Seals\u003c\/strong\u003e. Each pack contains \u003cstrong\u003e20 identical rings\u003c\/strong\u003e in your chosen outside diameter, making it easy to stock up on the exact size you need for maintenance, repairs, or new installations at home or in industrial\/factory settings.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e NBR (Nitrile Butadiene Rubber)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCross-Section (CS) Thickness:\u003c\/strong\u003e 3.1 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD) Options:\u003c\/strong\u003e 31 \/ 32 \/ 33 \/ 34 \/ 35 \/ 36 \/ 37 \/ 38 \/ 39 \/ 40 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID):\u003c\/strong\u003e 24.8 \/ 25.8 \/ 26.8 \/ 27.8 \/ 28.8 \/ 29.8 \/ 30.8 \/ 31.8 \/ 32.8 \/ 33.8 mm (corresponding to OD)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 20 pcs per pack\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Standard Ring Gasket\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e Standard metric sizing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose NBR O-Rings?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eOil Resistant\u003c\/strong\u003e — Excellent performance in contact with petroleum-based oils and fuels\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eWear Resistant\u003c\/strong\u003e — Durable rubber compound holds up under repeated compression and movement\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eWaterproof\u003c\/strong\u003e — Creates a dependable watertight seal in pipes, fittings, and valves\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eTemperature Resistant\u003c\/strong\u003e — Maintains sealing integrity across a wide temperature range\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eVersatile Use\u003c\/strong\u003e — Ideal for air conditioning units, hydraulic systems, pneumatic equipment, plumbing, and general mechanical assemblies in both home and factory environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cp\u003eThese NBR sealing rings are suited for a wide variety of uses including:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAir conditioning and HVAC fittings\u003c\/li\u003e\n  \u003cli\u003eHydraulic and pneumatic connectors\u003c\/li\u003e\n  \u003cli\u003ePlumbing pipe joints and faucet repairs\u003c\/li\u003e\n  \u003cli\u003eIndustrial machinery and factory equipment\u003c\/li\u003e\n  \u003cli\u003eAutomotive fluid systems\u003c\/li\u003e\n  \u003cli\u003eGeneral-purpose mechanical sealing at home or in the workshop\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\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\/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\/10-20mm-diamond-flat-grinding-wheel-dry-and-wet-use-heavy-duty-concrete-grinder-wheel-blue-vacuum-brazed\"\u003e10\/20mm Diamond Flat Grinding Wheel – Heavy Duty Concrete Grinder\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 sizes are available in this NBR O-ring pack?\u003c\/h4\u003e\n\u003cp\u003eA: Each pack contains 20 pieces of the same outside diameter. You can select from OD sizes of 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40 mm — all with a consistent 3.1 mm cross-section thickness.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are these O-rings suitable for use with oils and fuels?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. NBR (Nitrile Butadiene Rubber) is specifically formulated to resist petroleum-based oils, fuels, and hydraulic fluids, making it one of the most widely used materials for sealing in automotive, hydraulic, and industrial applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can these gasket rings be used in both home and industrial settings?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. These standard-metric NBR O-rings are well-suited for household plumbing repairs, air conditioning units, and DIY projects, as well as for factory and industrial machinery maintenance requiring reliable, leak-free seals.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I choose the correct O-ring size?\u003c\/h4\u003e\n\u003cp\u003eA: Measure the groove or fitting in which the O-ring will sit. Match the outside diameter (OD) of the O-ring to your fitting's specification. The inside diameter (ID) is OD minus twice the cross-section (CS), so for example a 31mm OD ring has an ID of approximately 24.8mm with a 3.1mm CS.\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 sizes are available in this NBR O-ring pack?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Each pack contains 20 pieces of the same outside diameter. You can select from OD sizes of 31, 32, 33, 34, 35, 36, 37, 38, 39, or 40 mm — all with a consistent 3.1 mm cross-section thickness.\"}}, {\"@type\": \"Question\", \"name\": \"Are these O-rings suitable for use with oils and fuels?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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