{"title":"O-Rings \u0026 Centering Rings","description":"","products":[{"product_id":"kf25-oring","title":"KF25 Oring","description":"\u003ch1\u003e\n\u003cstrong\u003eKF25 O-Ring with Centering Ring\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h1\u003e\n\u003cp\u003eReliable vacuum sealing for KF25 flange joints and pump inlets\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eKF25 O-Ring with Centering Ring\u003c\/strong\u003e is an essential sealing component for KF (also known as QF or NW) vacuum flange systems. Commonly used in vacuum lines and pump inlet connections, this assembly ensures accurate alignment and a secure, leak-free seal between mating KF25 flanges.\u003c\/p\u003e\n\u003cp\u003eEach unit consists of a precision stainless steel centering ring combined with a high-quality elastomer O-ring designed to maintain vacuum integrity across a wide range of operating conditions. An optional stainless steel mesh screen variant is available for added protection against particulate ingress, helping safeguard downstream equipment.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eComplete sealing assembly\u003c\/strong\u003e – Includes both centering ring and O-ring for reliable vacuum connections.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eKF25 compatibility\u003c\/strong\u003e – Designed specifically for KF25 (NW25) flanges and fittings.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOptional debris protection\u003c\/strong\u003e – Mesh screen variant available to prevent particulate entry into pumps or systems.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCorrosion-resistant construction\u003c\/strong\u003e – 304 stainless steel centering ring with durable elastomer seal.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eQuick installation\u003c\/strong\u003e – Drop-in design enables fast, tool-free assembly.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Specifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eFlange size\u003c\/strong\u003e – KF25 (NW25)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCentering ring material\u003c\/strong\u003e – 304 stainless steel\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eO-ring material\u003c\/strong\u003e – FKM (Viton®) or NBR, depending on variant\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOptional mesh screen\u003c\/strong\u003e – 304 stainless steel (select variant)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMaximum temperature\u003c\/strong\u003e – Up to 200 °C with Viton® O-ring\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInner diameter\u003c\/strong\u003e – Approx. 22 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOuter diameter\u003c\/strong\u003e – Approx. 30 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cstrong\u003eTypical Applications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eVacuum pump inlet sealing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLaboratory and analytical vacuum systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePharmaceutical and botanical processing equipment\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIndustrial vacuum chambers and lines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFluid or vacuum junctions using KF connections\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cstrong\u003eNotes for Use\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eConfirm O-ring material compatibility with your operating temperature and process media.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSelect the mesh screen variant when particulate filtration or pump protection is required.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInspect and replace O-rings periodically to maintain optimal vacuum performance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Botanical Health Oils Hardware Ltd","offers":[{"title":"Yes","offer_id":55963475673353,"sku":"1102450848","price":17.58,"currency_code":"GBP","in_stock":true},{"title":"No","offer_id":55963475706121,"sku":"1102137073","price":5.94,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0948\/6565\/4025\/files\/kf25_oring.png?v=1762271739"}],"url":"https:\/\/bhohardware.com\/collections\/o-rings-centering-rings.oembed","provider":"Botanical Health Oils Hardware Ltd","version":"1.0","type":"link"}