{"product_id":"hella-355123172-disc-brake-rotor-298mm-solid","title":"Hella 355123172 Disc Brake Rotor 298mm Solid","description":"\u003cp class=\"nvn-hero\"\u003eThe Hella 355123172 is a solid, one-piece disc brake rotor cast from zinc-coated gray iron. It measures 298mm across with a 16mm nominal thickness, a 71mm height, an 85mm hub bore, and a 7 x 130 millimeter bolt pattern. Match those specs to your vehicle and it's a clean, direct replacement that installs on the same hub as your original.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThis is the Hella 355123172, a solid one-piece disc brake rotor cast from gray iron and finished with a zinc coating. It's a straightforward replacement rotor built to a set of fixed dimensions, so if your current rotor matches this size and pattern, it drops right into the same spot on the hub. No vents, no two-piece hardware, just one clean casting that does its job.\u003c\/p\u003e\n\u003cp\u003eThe numbers matter on a brake rotor, so here they are up front. The outside diameter is 298 millimeters. Nominal thickness is 16 millimeters. Overall height, measured from the friction face to the back of the hat, is 71 millimeters. The center hub bore is 85 millimeters, and the wheel bolt pattern is 7 x 130 millimeters. Those five measurements are what determine fitment, and all five have to match your vehicle before this rotor is the right part. Cross-reference the part number 355123172 and the dimensions against your application before you order.\u003c\/p\u003e\n\u003cp\u003eSolid rotors like this one are common on lighter-duty and rear positions where the brakes don't shed as much heat as a heavy front setup. There's no internal vane structure, so the casting is a single slab of iron between the two friction faces. That keeps it simple and keeps the cost down. It also means the whole rotor is one continuous piece, which is easy to inspect and easy to measure for wear.\u003c\/p\u003e\n\u003cp\u003eThe zinc coating is there for corrosion resistance. It protects the hat, the edges, and the non-swept areas that would otherwise flash-rust the first time the vehicle sits out in the weather. The coating on the actual braking surface wears away in the first few stops once the pads start sweeping the face, and that's normal. You'll see a bright ring form where the pad rides. The zinc keeps the rest of the rotor looking clean and slows the surface rust that makes a rotor look tired long before it's actually worn out.\u003c\/p\u003e\n\u003cp\u003eGray cast iron is the standard material for a reason. It handles heat well, it wears predictably against a standard brake pad, and it damps vibration so you get quiet, consistent braking. Cast iron does have a limit, though. If you cook a rotor hard enough, on a long grade or with a dragging caliper, a solid one-piece casting can warp or develop hot spots. That's true of any rotor in this class, so keep an eye on your brake temps if you're working the vehicle hard.\u003c\/p\u003e\n\u003cp\u003eOn wear, the 16 millimeter figure is the nominal new thickness. Every rotor has a minimum thickness cast or stamped into the hat, and that's the number that actually matters when you're deciding whether to reuse or replace. Measure across the swept area with a micrometer. If you're at or below the stamped minimum, the rotor is done. Don't machine a rotor past its minimum to save it, because a thin rotor holds less heat and is more likely to warp.\u003c\/p\u003e\n\u003cp\u003eReplace rotors in pairs across an axle whenever you can. Even if only one side is worn, a fresh rotor on one corner and a tired one on the other gives you uneven braking feel, and it can pull the vehicle under hard stops. New rotors also want fresh pads and a proper bed-in. Bedding seats the pad material evenly onto the new surface and sets you up for quiet, full-strength braking from the start.\u003c\/p\u003e\n\u003cp\u003eInstallation is simple if you take your time. Clean the hub mating surface down to bare metal so the rotor seats dead flat. Any rust scale or old debris under the rotor throws off runout and gives you a pulsing pedal. Slide the rotor on, run the wheel down, and torque the lug nuts to your vehicle manufacturer's spec in a star pattern. Over-torquing or an uneven pattern can distort the rotor and undo all your careful prep.\u003c\/p\u003e\n\u003cp\u003eThis rotor is sold as a single piece, one rotor per box. If you're doing both sides of an axle, order two. It's a fit-and-forget part when it's matched correctly and installed clean, which is exactly what you want out of a brake component you're trusting to stop the vehicle.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e298 mm outside diameter with a 16 mm nominal thickness, sized to replace a same-dimension original rotor.\u003c\/li\u003e\n  \u003cli\u003eSolid one-piece design, a single iron casting with no internal vanes for easy inspection and measurement.\u003c\/li\u003e\n  \u003cli\u003eZinc coating on the hat and edges resists corrosion and keeps non-swept areas from flash-rusting.\u003c\/li\u003e\n  \u003cli\u003eGray cast iron construction handles heat and damps vibration for quiet, consistent braking.\u003c\/li\u003e\n  \u003cli\u003e85 mm center hub bore and 7 x 130 mm wheel bolt pattern, verify both against your vehicle before ordering.\u003c\/li\u003e\n  \u003cli\u003e71 mm overall height from the friction face to the back of the hat.\u003c\/li\u003e\n  \u003cli\u003eSold as a single rotor, order two to do both sides of an axle.\u003c\/li\u003e\n  \u003cli\u003eManufacturer part number 355123172 for straightforward cross-referencing to your application.\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 355123172 rotor?\u003c\/summary\u003e\n    \u003cp\u003eIt has a 298 mm outside diameter, a 16 mm nominal thickness, a 71 mm overall height, and an 85 mm center hub bore. The wheel bolt pattern is 7 x 130 millimeters.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a solid or a vented rotor?\u003c\/summary\u003e\n    \u003cp\u003eIt's a solid, one-piece rotor. There are no internal cooling vanes, just a single gray cast iron casting between the two friction faces.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it come as a pair or a single rotor?\u003c\/summary\u003e\n    \u003cp\u003eIt's sold as a single rotor, one per box. If you're replacing both sides of an axle, order two.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the rotor made of?\u003c\/summary\u003e\n    \u003cp\u003eGray cast iron with a zinc coating. The iron handles heat and damps vibration, and the zinc slows corrosion on the hat and edges.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill the zinc coating stay on the braking surface?\u003c\/summary\u003e\n    \u003cp\u003eNo. The zinc on the swept face wears off in the first few stops as the pads seat, which is normal. The coating stays on the hat and edges where the pads don't ride.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know when to replace this rotor?\u003c\/summary\u003e\n    \u003cp\u003eMeasure the swept area with a micrometer against the minimum thickness cast or stamped into the rotor. At or below that number, replace it. Don't run a rotor thinner than its minimum.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need to replace both rotors on the axle?\u003c\/summary\u003e\n    \u003cp\u003eWe recommend it. A new rotor on one side and a worn one on the other gives uneven braking and can pull the vehicle under hard stops. Fresh pads and a proper bed-in help too.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow should I install it?\u003c\/summary\u003e\n    \u003cp\u003eClean the hub face to bare metal so the rotor seats flat, then torque the lug nuts to your vehicle manufacturer's spec in a star pattern. Rust or debris under the rotor causes runout and a pulsing pedal.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I confirm this rotor fits my vehicle?\u003c\/summary\u003e\n    \u003cp\u003eMatch the part number 355123172 and all the physical specs, outside diameter, thickness, hub bore, and bolt pattern, to your vehicle's requirements before ordering. The listing dimensions are the source of truth for fitment.\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 355123172 Solid One-Piece 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\u003e355123172\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e4082300574685\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRotor Type\u003c\/th\u003e\n\u003ctd\u003eDisc Brake Rotor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDesign\u003c\/th\u003e\n\u003ctd\u003eSolid, One Piece\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003e298 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNominal Thickness\u003c\/th\u003e\n\u003ctd\u003e16 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHeight\u003c\/th\u003e\n\u003ctd\u003e71 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHub Size\u003c\/th\u003e\n\u003ctd\u003e85 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWheel Bolt Pattern\u003c\/th\u003e\n\u003ctd\u003e7 x 130 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\u003eQuantity\u003c\/th\u003e\n\u003ctd\u003eSingle (sold individually)\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 355123172 rotor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It has a 298 mm outside diameter, a 16 mm nominal thickness, a 71 mm overall height, and an 85 mm center hub bore. The wheel bolt pattern is 7 x 130 millimeters.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a solid or a vented rotor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's a solid, one-piece rotor. There are no internal cooling vanes, just a single gray cast iron casting between the two friction faces.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it come as a pair or a single rotor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's sold as a single rotor, one per box. If you're replacing both sides of an axle, order two.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the rotor made of?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Gray cast iron with a zinc coating. The iron handles heat and damps vibration, and the zinc slows corrosion on the hat and edges.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will the zinc coating stay on the braking surface?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. The zinc on the swept face wears off in the first few stops as the pads seat, which is normal. The coating stays on the hat and edges where the pads don't ride.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I know when to replace this rotor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Measure the swept area with a micrometer against the minimum thickness cast or stamped into the rotor. At or below that number, replace it. Don't run a rotor thinner than its minimum.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do I need to replace both rotors on the axle?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"We recommend it. A new rotor on one side and a worn one on the other gives uneven braking and can pull the vehicle under hard stops. Fresh pads and a proper bed-in help too.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How should I install it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Clean the hub face to bare metal so the rotor seats flat, then torque the lug nuts to your vehicle manufacturer's spec in a star pattern. Rust or debris under the rotor causes runout and a pulsing pedal.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I confirm this rotor fits my vehicle?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Match the part number 355123172 and all the physical specs, outside diameter, thickness, hub bore, and bolt pattern, to your vehicle's requirements before ordering. The listing dimensions are the source of truth for fitment.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Hella","offers":[{"title":"Default Title","offer_id":45064658714717,"sku":"2008762","price":75.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_560944b9-ef7d-4273-a0b5-9a1090409029.jpg?v=1789606616","url":"https:\/\/nvnmarine.com\/products\/hella-355123172-disc-brake-rotor-298mm-solid","provider":"NVN Marine","version":"1.0","type":"link"}