{"product_id":"hella-355122952-vented-disc-brake-rotor-322mm","title":"Hella 355122952 Vented Disc Brake Rotor, 322mm 6x112","description":"\u003cp class=\"nvn-hero\"\u003eThe Hella 355122952 is a vented, one-piece disc brake rotor cast from zinc-coated gray iron. It measures 322 mm across with a 32 mm nominal thickness and a 6 x 112 mm bolt pattern, so it drops in as a direct replacement when the numbers match your hub. Solid stopping power, built to resist rust from the first mile.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Hella 355122952 is a direct-replacement disc brake rotor built to bring a worn braking system back to full strength. It's a vented, one-piece casting in gray iron, measuring 322 mm in outside diameter with a 32 mm nominal thickness and an overall height of 64.30 mm. The center hub bore is 67 mm and the wheel bolt pattern is 6 x 112 mm. When those numbers line up with what's already on the vehicle, this rotor bolts on with no modification.\u003c\/p\u003e\n\u003cp\u003eThe vented design is the part that matters most under hard use. Two friction faces separated by internal cooling vanes let air pull heat out of the rotor as the wheel spins. That keeps temperatures down during repeated stops, and cooler rotors mean more consistent pedal feel and less brake fade on a long downhill grade or in stop-and-go traffic. A one-piece casting keeps the whole disc rigid, so you get even pad contact and less chance of the vibration that shows up when a rotor warps.\u003c\/p\u003e\n\u003cp\u003eHella finishes this one with a zinc coating over the gray iron. That's a real advantage if you park outside or drive where the roads get salted in winter. Bare cast iron starts surface-rusting almost immediately, and while the friction faces wear clean every time you brake, the hat and the edges don't. The zinc coating keeps those non-wearing areas clean and stops the flaky orange rust that makes an older wheel look neglected. It also makes the next brake job easier, because the rotor won't have seized itself to the hub.\u003c\/p\u003e\n\u003cp\u003eFitment comes down to the numbers, so measure before you order. Check the bolt pattern (6 x 112 mm), the outside diameter (322 mm), the nominal thickness (32 mm), and the center bore (67 mm) against the rotor you're pulling off. Vented front rotors in this size range are common across a lot of platforms, but the only thing that guarantees a fit is matching the dimensions and the bolt pattern exactly. If any one of those is off, it's the wrong disc for your hub.\u003c\/p\u003e\n\u003cp\u003eHow do you know it's time? Rotors wear down every time the pads squeeze them, and eventually they drop below the minimum thickness stamped on the disc. Signs you're due include a pulsing or shuddering pedal under braking, a scoring groove you can feel with a fingernail, a lip built up around the outer edge, or visible cracks and deep rust pitting on the friction face. Once a rotor is at or below minimum thickness it can't be resurfaced safely, and it's time for a replacement like this one.\u003c\/p\u003e\n\u003cp\u003eA few notes from doing this work. Replace rotors in axle pairs, never just one side. Braking has to be balanced left to right, and a fresh disc against a worn one on the other wheel will pull. Fit new pads at the same time, since old pads carry a wear pattern and a transfer layer that won't match a new surface. And bed the brakes in properly after the install, a series of firm slowdowns from moderate speed to seat the pads and lay down an even transfer layer. Skip that step and you invite uneven deposits and a pulsing pedal down the road.\u003c\/p\u003e\n\u003cp\u003eGray cast iron is still the material of choice for a reason. It handles heat well, damps vibration and noise, and wears in a predictable, pad-friendly way. This casting pairs that proven material with the vented, one-piece format that most modern disc setups are designed around, so you get replacement performance that matches what left the factory rather than a compromise. It's sold as a single rotor, so order the quantity your axle needs, torque the wheel and caliper hardware to the vehicle's spec, and you're back to a firm, quiet pedal.\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 with internal cooling vanes dissipates heat for consistent pedal feel and less brake fade\u003c\/li\u003e\n  \u003cli\u003eOne-piece gray cast iron casting stays rigid for even pad contact and reduced vibration\u003c\/li\u003e\n  \u003cli\u003eZinc-coated finish resists corrosion on the hat, edges, and vanes even in salted or wet climates\u003c\/li\u003e\n  \u003cli\u003e322 mm outside diameter with a 32 mm nominal thickness for direct-replacement fitment\u003c\/li\u003e\n  \u003cli\u003e6 x 112 mm wheel bolt pattern with a 67 mm center hub bore\u003c\/li\u003e\n  \u003cli\u003e64.30 mm overall height matches the original rotor profile\u003c\/li\u003e\n  \u003cli\u003eSold as a single rotor, so you can order the exact quantity your axle needs\u003c\/li\u003e\n  \u003cli\u003eHella part number 355122952 for straightforward cross-reference and ordering\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 the Hella 355122952 rotor?\u003c\/summary\u003e\n    \u003cp\u003eIt's 322 mm in outside diameter, 32 mm nominal thickness, and 64.30 mm overall height, with a 67 mm center hub bore. It's a vented, one-piece design.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the bolt pattern?\u003c\/summary\u003e\n    \u003cp\u003e6 x 112 mm. That's six bolt holes on a 112 mm pattern. Match it to your hub before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a vented or solid rotor?\u003c\/summary\u003e\n    \u003cp\u003eVented. Internal vanes between the two friction faces pull heat out during repeated stops, which helps resist fade.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it come with brake pads?\u003c\/summary\u003e\n    \u003cp\u003eNo, this is the rotor only. It's sold as a single. Order pads separately and replace them when you fit the new rotor.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this one rotor or a pair?\u003c\/summary\u003e\n    \u003cp\u003eA single rotor. Best practice is to replace rotors in axle pairs, so order two if you're doing a complete axle.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the rotor made of?\u003c\/summary\u003e\n    \u003cp\u003eZinc-coated gray cast iron. Cast iron handles heat well and damps noise, and the zinc coating fights corrosion on the surfaces that don't wear clean.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know it'll fit my vehicle?\u003c\/summary\u003e\n    \u003cp\u003eMatch the four key numbers against the rotor you're removing: 6 x 112 mm bolt pattern, 322 mm outside diameter, 32 mm thickness, and 67 mm center bore. If all four match, it bolts on.\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 the install, run a series of firm slowdowns from moderate speed to seat the pads and lay down an even transfer layer. It prevents pedal pulsing later.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan this rotor be resurfaced later?\u003c\/summary\u003e\n    \u003cp\u003eOnly while it stays above the minimum thickness stamped on the disc. Once it's at or below that number, it has to be replaced rather than machined.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does the zinc coating actually do?\u003c\/summary\u003e\n    \u003cp\u003eIt protects the hat, edges, and cooling vanes from rust. The friction faces wear clean on their own, but the rest of the casting corrodes fast without a coating.\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 Disc Brake Rotor 355122952\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\u003e355122952\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e4082300574289\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRotor Design\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 112 Millimeter\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003e322 Millimeter\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNominal Thickness\u003c\/th\u003e\n\u003ctd\u003e32 Millimeter\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHeight\u003c\/th\u003e\n\u003ctd\u003e64.30 Millimeter\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHub Size (Center Bore)\u003c\/th\u003e\n\u003ctd\u003e67 Millimeter\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\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 the Hella 355122952 rotor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's 322 mm in outside diameter, 32 mm nominal thickness, and 64.30 mm overall height, with a 67 mm center hub bore. It's a vented, one-piece design.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the bolt pattern?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"6 x 112 mm. That's six bolt holes on a 112 mm pattern. Match it to your hub before ordering.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a vented or solid rotor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Vented. Internal vanes between the two friction faces pull heat out during repeated stops, which helps resist fade.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it come with brake pads?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No, this is the rotor only. It's sold as a single. Order pads separately and replace them when you fit the new rotor.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this one rotor or a pair?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A single rotor. Best practice is to replace rotors in axle pairs, so order two if you're doing a complete axle.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the rotor made of?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Zinc-coated gray cast iron. Cast iron handles heat well and damps noise, and the zinc coating fights corrosion on the surfaces that don't wear clean.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I know it'll fit my vehicle?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Match the four key numbers against the rotor you're removing: 6 x 112 mm bolt pattern, 322 mm outside diameter, 32 mm thickness, and 67 mm center bore. If all four match, it bolts on.\"\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 the install, run a series of firm slowdowns from moderate speed to seat the pads and lay down an even transfer layer. It prevents pedal pulsing later.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can this rotor be resurfaced later?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Only while it stays above the minimum thickness stamped on the disc. Once it's at or below that number, it has to be replaced rather than machined.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does the zinc coating actually do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It protects the hat, edges, and cooling vanes from rust. The friction faces wear clean on their own, but the rest of the casting corrodes fast without a coating.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Hella","offers":[{"title":"Default Title","offer_id":45059625975901,"sku":"2008458","price":113.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_f25645a8-7a09-4a13-bad6-cb60c5a1032e.jpg?v=1789516215","url":"https:\/\/nvnmarine.com\/products\/hella-355122952-vented-disc-brake-rotor-322mm","provider":"NVN Marine","version":"1.0","type":"link"}