{"product_id":"hella-355117832-300mm-vented-disc-brake-rotor-6x120","title":"Hella 355117832 300mm Vented Disc Brake Rotor 6x120","description":"\u003cp class=\"nvn-hero\"\u003eThe Hella 355117832 is a vented, one-piece disc brake rotor cast in zinc-coated gray iron. It measures 300mm across and 20mm thick, with a 6 x 120 millimeter bolt pattern. A direct-fit replacement casting that gets a worn corner back to firm, quiet, fade-resistant stopping. Sold as a single rotor, so order two if you're doing both sides of the axle.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eBrake rotors are one of those parts you don't think about until the pedal starts pulsing or you hear a grind coming into a stop. This Hella 355117832 disc brake rotor is a straight replacement casting, built to get a worn corner back to solid, quiet, predictable stopping. It's a vented one-piece rotor measuring 300 millimeters across, 20 millimeters thick, with a 66 millimeter overall height and a 6 x 120 millimeter wheel bolt pattern. If those numbers match what's on your car right now, this is the part that bolts on.\u003c\/p\u003e\n\u003cp\u003eThe vented design is the important bit here. Instead of a single solid disc, a vented rotor has two friction faces with cooling vanes cast between them. Air pulls through those vanes as the wheel spins and carries heat away from the braking surface. That matters because heat is what kills braking performance. Push a solid rotor hard on a long downhill or in stop-and-go traffic and it soaks up heat until the pads start to fade. A vented casting sheds that heat far better, so you keep a firm pedal and consistent bite when you're leaning on the brakes.\u003c\/p\u003e\n\u003cp\u003eIt's a one-piece casting in gray cast iron, still the material of choice for daily-driver brake rotors for good reason. Gray iron handles repeated heat cycles without the warping you'd worry about with cheaper metals, and it machines to a smooth, even friction face that treats your pads kindly. The one-piece construction means the hat and the disc are cast as a single unit, so there's nothing to come loose and no extra assembly to fuss with at install.\u003c\/p\u003e\n\u003cp\u003eHella finishes this rotor with a zinc coating, and if you've ever pulled a wheel after a wet winter and found the rotor hat and edges caked in orange rust, you'll appreciate it. The zinc holds off surface corrosion on the areas the pads never touch, so the rotor keeps looking clean behind an open-spoke wheel and the hat doesn't seize onto the hub over time. The coating on the friction face itself wears away in the first few stops as the pads seat, which is completely normal and exactly what's supposed to happen.\u003c\/p\u003e\n\u003cp\u003eA rotor only does its job if the dimensions match, so check your numbers before you order. Outside diameter here is 300 millimeters, nominal thickness is 20 millimeters, and the bolt pattern is 6 x 120 millimeter. Thickness in particular is worth confirming against your caliper and pads, because a rotor that's even a couple millimeters off won't sit right in the caliper. When in doubt, measure the rotor that's coming off, or match it against your vehicle's service spec.\u003c\/p\u003e\n\u003cp\u003eThis is sold as a single rotor, so if you're doing both sides of an axle, which we'd always recommend, order two. Replacing rotors in pairs keeps braking even side to side and stops the car from pulling under hard braking. It's also the right time to put fresh pads on. New pads on a new rotor bed in together and give you the cleanest, quietest result. Putting worn pads onto a new rotor just transfers the old uneven deposits and can leave you with the noise or vibration you were trying to get rid of.\u003c\/p\u003e\n\u003cp\u003eInstall is straightforward if you've turned a wrench before. Clean the hub face so the new rotor sits flat, hang it, torque your caliper bracket and wheel to spec, then bed the brakes in properly before you drive normally. A typical bed-in is a series of moderate stops from around 35 to 5 miles per hour, backing off between them to let things cool, which lays down an even layer of pad material and sets up smooth, quiet braking. Skip that step and you're more likely to end up with pedal pulsation down the road. And if brake work isn't your thing, any shop can install it in well under an hour.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eVented rotor design pulls cooling air through internal vanes, shedding heat so the pedal stays firm and the pads resist fade on long descents and in stop-and-go traffic\u003c\/li\u003e\n  \u003cli\u003eOne-piece gray cast iron casting handles repeated heat cycles without warping and machines to a smooth friction face that's easy on pads\u003c\/li\u003e\n  \u003cli\u003eZinc coating protects the hat and non-friction surfaces from rust, so the rotor stays clean behind open wheels and won't seize to the hub\u003c\/li\u003e\n  \u003cli\u003e300 millimeter outside diameter with a 20 millimeter nominal thickness, measure against your old rotor to confirm fit\u003c\/li\u003e\n  \u003cli\u003e6 x 120 millimeter wheel bolt pattern with a 66 millimeter overall height\u003c\/li\u003e\n  \u003cli\u003eSold as a single rotor, pair two for even, balanced braking across the axle\u003c\/li\u003e\n  \u003cli\u003eDirect-fit replacement casting, no modification needed when the dimensions match your vehicle\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Hella Marine reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the dimensions of this rotor?\u003c\/summary\u003e\n    \u003cp\u003eIt's 300 millimeters in outside diameter, 20 millimeters in nominal thickness, and 66 millimeters in overall height. Measure your old rotor against those numbers before ordering to confirm the fit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat wheel bolt pattern does it use?\u003c\/summary\u003e\n    \u003cp\u003eThe wheel bolt pattern is 6 x 120 millimeter. Make sure that matches your vehicle before you buy.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a vented rotor?\u003c\/summary\u003e\n    \u003cp\u003eYes. It's a vented one-piece design with cooling vanes cast between the two friction faces, which helps it shed heat and resist brake fade better than a solid rotor.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the rotor made of?\u003c\/summary\u003e\n    \u003cp\u003eGray cast iron with a zinc coating. Cast iron handles repeated heat cycles well, and the zinc coating holds off rust on the hat and edges the pads don't touch.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this sold as a single rotor or a pair?\u003c\/summary\u003e\n    \u003cp\u003eIt's sold as a single rotor. If you're replacing both sides of an axle, and we'd recommend you do, you'll want to order two.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo brake pads or hardware come with it?\u003c\/summary\u003e\n    \u003cp\u003eNo, this is the rotor only. You'll want fresh pads to go with it, since new pads and a new rotor bed in together for the quietest, smoothest result.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill the coating on the braking surface come off?\u003c\/summary\u003e\n    \u003cp\u003eOn the friction face it wears away in the first few stops as the pads seat, which is normal. The zinc coating stays put on the hat and edges where the pads never make contact, protecting them from rust.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need to bed in the new rotor?\u003c\/summary\u003e\n    \u003cp\u003eYes. After install, do a series of moderate stops from about 35 to 5 miles per hour with cool-down time between them. That lays down an even layer of pad material and sets up smooth, quiet braking.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know when my rotors need replacing?\u003c\/summary\u003e\n    \u003cp\u003eCommon signs are a pulsing brake pedal, vibration through the steering wheel when braking, deep scoring or grooves in the rotor face, or a thickness below your vehicle's minimum spec. If you see any of those, it's time.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I install this myself?\u003c\/summary\u003e\n    \u003cp\u003eIf you've done brake work before, yes. Clean the hub, hang the rotor, torque the caliper and wheel to spec, and bed the brakes in. If it's not your thing, any shop can handle it quickly.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eHella 355117832 Vented Disc Brake Rotor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eHella\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e355117832\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e4082300574036\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRotor Type\u003c\/th\u003e\n\u003ctd\u003eVented\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConstruction\u003c\/th\u003e\n\u003ctd\u003eOne-Piece Design\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWheel Bolt Pattern\u003c\/th\u003e\n\u003ctd\u003e6 x 120 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003e300 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNominal Thickness\u003c\/th\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOverall Height\u003c\/th\u003e\n\u003ctd\u003e66 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eZinc-Coated Gray Cast Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003eSingle (one rotor)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What are the dimensions of this rotor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's 300 millimeters in outside diameter, 20 millimeters in nominal thickness, and 66 millimeters in overall height. Measure your old rotor against those numbers before ordering to confirm the fit.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What wheel bolt pattern does it use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The wheel bolt pattern is 6 x 120 millimeter. Make sure that matches your vehicle before you buy.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a vented rotor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It's a vented one-piece design with cooling vanes cast between the two friction faces, which helps it shed heat and resist brake fade better than a solid rotor.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the rotor made of?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Gray cast iron with a zinc coating. Cast iron handles repeated heat cycles well, and the zinc coating holds off rust on the hat and edges the pads don't touch.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this sold as a single rotor or a pair?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's sold as a single rotor. If you're replacing both sides of an axle, and we'd recommend you do, you'll want to order two.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do brake pads or hardware come with it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No, this is the rotor only. You'll want fresh pads to go with it, since new pads and a new rotor bed in together for the quietest, smoothest result.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will the coating on the braking surface come off?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"On the friction face it wears away in the first few stops as the pads seat, which is normal. The zinc coating stays put on the hat and edges where the pads never make contact, protecting them from rust.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do I need to bed in the new rotor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. After install, do a series of moderate stops from about 35 to 5 miles per hour with cool-down time between them. That lays down an even layer of pad material and sets up smooth, quiet braking.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I know when my rotors need replacing?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Common signs are a pulsing brake pedal, vibration through the steering wheel when braking, deep scoring or grooves in the rotor face, or a thickness below your vehicle's minimum spec. If you see any of those, it's time.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I install this myself?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"If you've done brake work before, yes. Clean the hub, hang the rotor, torque the caliper and wheel to spec, and bed the brakes in. If it's not your thing, any shop can handle it quickly.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Hella","offers":[{"title":"Default Title","offer_id":45066454171741,"sku":"2008881","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_9fd6564d-5a4d-401c-8559-03e7ea37c25b.jpg?v=1789642839","url":"https:\/\/nvnmarine.com\/products\/hella-355117832-300mm-vented-disc-brake-rotor-6x120","provider":"NVN Marine","version":"1.0","type":"link"}