Hella 355122942 Vented Drilled Brake Rotor, 322mm 6x112
Hella 355122942 Vented Drilled Brake Rotor, 322mm 6x112 — Product description
The Hella 355122942 is a full-size front brake rotor, 322mm across and 32mm thick, with a vented and drilled face for cooling. It runs a 6x112 bolt pattern and a 67mm center bore, cast in one piece of zinc-coated gray iron. Check the fit, then buy two for the axle.
The Hella 355122942 is a front brake rotor built to bring a European chassis back to a firm, honest pedal. It measures 322 millimeters across the face with a 32 millimeter nominal thickness, so it's a full-size disc meant for real stopping work, not a budget stamped part. The casting is one piece of gray cast iron, which keeps wear even and predictable over the life of the rotor.
What sets this one apart from a plain-faced disc is the vented and drilled design. The internal vanes pull air through the middle of the rotor as the wheel turns, and that airflow is what keeps temperatures in check during repeated hard stops. The drilled holes in the face give heat, brake dust, and water somewhere to go, so the pad keeps clean, consistent contact even when you're working the brakes down a long grade or in the wet. You get a rotor that resists the fade you feel when a disc gets heat-soaked.
Gray cast iron is the standard here for a reason. It handles heat well, it damps vibration so you get less squeal, and it machines to a true, flat surface that runs smooth against the pad. Because this is a one-piece design, the hat and the friction ring are cast together as a single unit rather than bolted together. That keeps the part simple, strong, and easy to service.
The fitment specifics matter, so check them against your vehicle before you order. This rotor uses a 6 by 112 millimeter wheel bolt pattern with a 67 millimeter center bore, and the hat stands 64 and a half millimeters tall. Those numbers describe a specific European application, and the cleanest way to confirm it's right for your car is to match the Hella part number 355122942 or run your VIN. If the bolt pattern, bore, diameter, and thickness all line up, you're in the right place.
The zinc coating is a nice touch that pays off over time. Hella coats the hat, the edges, and the vanes so the parts of the rotor you can see through the wheel don't flash over with surface rust after the first rain. The braking surface itself wears clean the way any rotor does once the pads start riding on it, but the cosmetic areas stay looking sharp a lot longer than a bare iron disc.
A few honest install notes. This is sold as a single rotor, so for a normal brake job you'll want two of them to do a complete axle. Always replace rotors in pairs across an axle so both sides bite the same. Plan on fresh pads at the same time, because bedding new pads against a new rotor is what sets up quiet, even braking from day one. And take the few minutes to bed them in properly with a series of moderate stops before you lean on them hard. It makes a real difference in noise and feel.
When you install it, torque the wheel lug nuts to the vehicle's spec in a star pattern and re-check them after your first drive. Over-torquing can distort the hat on a rotor like this, and that's a common cause of the pulsing you feel through the pedal a few weeks after a brake job. Go by the book, seat everything evenly, and this rotor will run true.
Who's this for? Anyone doing their own front brake service on a vehicle that runs the 6x112, 67mm, 322mm setup and wants a quality replacement rotor with the cooling benefit of a vented, drilled face. It's a straightforward part done right. Confirm the fit, buy two, grab a set of pads, and you've got a solid brake refresh done in the driveway on a weekend.
Key Features
- 322 millimeter outside diameter with 32 millimeter nominal thickness, a full-size front rotor for firm, fade-resistant stops
- Vented and drilled face pulls heat out through the vanes and clears dust and water from the pad contact area
- 6 x 112 millimeter wheel bolt pattern with a 67 millimeter center bore, a specific European fitment to verify before ordering
- One-piece gray cast iron casting for even, predictable wear and less vibration and squeal
- Zinc-coated hat, edges, and vanes resist surface rust between drives so the visible areas stay clean
- 64-1/2 millimeter hat height keeps the disc true to the original geometry
- Sold individually so you can match exactly what your axle needs
Why Buy from NVN Marine
- Authorized Hella Marine reseller, full manufacturer warranty
- NMEA member and ABYC certified, advice from real boat techs
- Same-day shipping before 3 PM ET on in-stock items
- NY headquarters and Fort Lauderdale flagship retail store
Technical specifications
| Title | Hella 355122942 Vented Drilled Brake Rotor, 322mm 6x112 |
|---|---|
| Brand | Hella |
| Manufacturer Part Number | 355122942 |
| UPC | 4082300574272 |
| Rotor Design | Vented, Drilled |
| Construction | One Piece Design |
| Outside Diameter | 322 Millimeter |
| Nominal Thickness | 32 Millimeter |
| Height | 64-1/2 Millimeter |
| Wheel Bolt Pattern | 6 x 112 Millimeter |
| Hub Size | 67 Millimeter |
| Material | Zinc Coated Gray Cast Iron |
| Finish | Zinc Coated |
| Sold As | Single |
Frequently asked questions
Is this sold as a pair or a single rotor?
It's a single rotor. For a normal front brake job you'll want two of them to do the complete axle, and you should always replace rotors in pairs so both sides bite evenly.
What are the exact dimensions?
322 millimeter outside diameter, 32 millimeter nominal thickness, and a hat height of 64 and a half millimeters. Match those numbers to your original rotor to confirm the fit.
What bolt pattern and hub bore does it use?
A 6 by 112 millimeter wheel bolt pattern with a 67 millimeter center bore. Both need to match your vehicle, so check them before ordering.
What does vented and drilled mean?
Vented means there are internal vanes between two friction faces that pump air through the rotor to shed heat. Drilled means the face has holes that give heat, brake dust, and water a path away from the pad, which helps keep braking consistent when things get hot or wet.
Will the zinc coating wear off the braking surface?
The coating is there to protect the hat, edges, and vanes from rust. The friction surface wears clean the moment the pads start riding on it, which is normal for any rotor. The cosmetic areas you see through the wheel stay protected.
How do I confirm this fits my vehicle?
The cleanest way is to match the Hella part number 355122942 or run your VIN. Then verify the bolt pattern (6 x 112 mm), center bore (67 mm), diameter (322 mm), and thickness (32 mm) against your current rotor.
Do I need new brake pads too?
We recommend fresh pads whenever you install new rotors. Bedding new pads against a new rotor is what sets up quiet, even braking from the start. This part is the rotor only and does not include pads, sensors, or hardware.
How do I bed in a new rotor?
After install, make a series of moderate stops from moderate speed to bring the brakes up to temperature gradually, then let them cool before any hard stops. That transfers an even layer of pad material to the rotor and reduces noise and pedal pulse.
What causes brake pulsing after a new rotor?
The most common cause is uneven lug torque. Torque the wheel nuts to the vehicle's spec in a star pattern and re-check after the first drive. Over-torquing can distort the hat and show up as a pulse through the pedal weeks later.
Is this the same as the non-drilled Hella 355122952?
They share the same 322 mm diameter, 32 mm thickness, 6 x 112 bolt pattern, and 67 mm bore. This 355122942 adds the drilled face. Order the exact part number your vehicle calls for.
