{"product_id":"smith-blair-razorlock-restrained-coupling-431","title":"Smith-Blair Style 431 RazorLock Wide Range Restrained Coupling - 4-8 in","description":"\u003c!-- TABS --\u003e\n\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe Smith-Blair Style 431 RazorLock wide range restrained coupling joins and restrains plain-end pipe with a single Dual Drive bolt on each end - no thrust blocks, tie rods, or separate joint restraints required. Each size covers the full OD span of ductile iron, PVC, PVCO, steel, and cast iron pipe within its range, so one coupling on the truck replaces several sized couplings plus restraint hardware.\u003c\/p\u003e\n\u003cp\u003eRazorLock installs stab-fit out of the box with no disassembly. As the Dual Drive bolt is tightened, flex points cast into the flanges bend the followers uniformly, compressing the gasket and the one-piece wedge-shaped grip ring around the pipe without point loading or egging. The grip ring's multi-length teeth distribute thrust loads, and engagement increases with internal pressure. The Dual Drive bolt tightens with a standard 1\/2 in square drive or a standard-depth heavy hex socket. RazorLock builds on the EZ Maxi-Grip natural gas restraint platform proven in hundreds of thousands of installations, and carries UL certification for health effects (MH59934).\u003c\/p\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eNominal Size\u003c\/th\u003e\n\u003cth\u003eOD Range\u003c\/th\u003e\n\u003cth\u003eBolts\u003c\/th\u003e\n\u003cth\u003eInstallation Torque\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e4 in\u003c\/td\u003e\n\u003ctd\u003e4.44 in to 5.06 in\u003c\/td\u003e\n\u003ctd\u003e(2) 5\/8 in Dual Drive\u003c\/td\u003e\n\u003ctd\u003e100 ft-lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6 in\u003c\/td\u003e\n\u003ctd\u003e6.56 in to 7.16 in\u003c\/td\u003e\n\u003ctd\u003e(2) 5\/8 in Dual Drive\u003c\/td\u003e\n\u003ctd\u003e130 ft-lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8 in\u003c\/td\u003e\n\u003ctd\u003e8.53 in to 9.39 in\u003c\/td\u003e\n\u003ctd\u003e(2) 3\/4 in Dual Drive\u003c\/td\u003e\n\u003ctd\u003e250 ft-lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"table-wrapper\"\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eWorking pressure\u003c\/td\u003e\n\u003ctd\u003e250 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTest pressure\u003c\/td\u003e\n\u003ctd\u003e375 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRestraint rating\u003c\/td\u003e\n\u003ctd\u003e100 F delta-T, HDPE DR 9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSleeve\u003c\/td\u003e\n\u003ctd\u003eCast ductile iron per ASTM A536, 7 in length, with carrying handle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlanges\u003c\/td\u003e\n\u003ctd\u003eCast ductile iron per ASTM A536 or cast carbon steel, controlled-flex design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGasket\u003c\/td\u003e\n\u003ctd\u003eMolded Buna-N per ASTM D2000 with molded-in corrugated 304 stainless armor, one per end\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrip ring\u003c\/td\u003e\n\u003ctd\u003eOne-piece heat treated carbon steel, wedge-shaped, near-full circumferential\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware\u003c\/td\u003e\n\u003ctd\u003eStainless steel per ASTM A193 and A194 with anti-galling coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eFusion bonded epoxy per AWWA C213\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003cp\u003eSuitable for PVC (DIPS-DR25, IPS-SDR26 minimum thickness), PVCO (CIOD PC235 minimum), PE DR32.5 minimum with stiffeners, ductile iron, carbon steel, and round smooth cast iron. The 8 in size is a new factory release - contact us to confirm current lead time before scheduling installation.\u003c\/p\u003e\n\u003cp\u003eDownloads: \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0264\/1913\/4527\/files\/razorlock-technical-brochure-021326.pdf\" target=\"_blank\"\u003eTechnical Brochure\u003c\/a\u003e | \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0264\/1913\/4527\/files\/Product_Specification_-_431_RazorLock_Wide_Range_Restraint_Coupling.pdf\" target=\"_blank\"\u003eProduct Specification\u003c\/a\u003e | \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0264\/1913\/4527\/files\/razorlock-infographic.pdf\" target=\"_blank\"\u003eProduct Infographic\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eFor engineering-led selection support, restraint calculations, or a factory submittal, email \u003ca href=\"mailto:sales@watermainsupply.com\"\u003esales@watermainsupply.com\u003c\/a\u003e or call 281.664.8000.\u003c\/p\u003e","brand":"Smith Blair","offers":[{"title":"4 in \/ 4.44 in to 5.06 in","offer_id":47314053071023,"sku":"431-04440506-031","price":947.37,"currency_code":"USD","in_stock":true},{"title":"6 in \/ 6.56 in to 7.16 in","offer_id":47314053103791,"sku":"431-06560716-031","price":1144.74,"currency_code":"USD","in_stock":true},{"title":"8 in \/ 8.53 in to 9.39 in","offer_id":47314053136559,"sku":"431-08530939-031","price":1505.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0264\/1913\/4527\/files\/Smith-Blair_Razor_Lock_431_Coupling.png?v=1785969361","url":"https:\/\/watermainsupply.com\/products\/smith-blair-razorlock-restrained-coupling-431","provider":"Watermainsupply","version":"1.0","type":"link"}