These bolts, as the name suggests, have a shoulder – that’s a wider section right where the threads start. It’s designed to fit snugly into a counterbore, which is basically a recessed area in a part. This allows the bolt to be tightened down without actually stressing the part it's holding together. It acts like a shield, distributing the clamping force evenly. It secures components, but it also keeps things aligned. You’ll find these most often connecting parts of the drivetrain, specifically around axles and shafts. They're used where precise alignment and a strong, reliable connection are needed. They might hold a brake rotor on an axle shaft, or secure a differential component. It’s a pretty specialized fastener, not something you’d use just anywhere on the vehicle. These aren't like regular bolts where you can just grab anything that fits. The shoulder is critical for proper operation. If a standard bolt is used, or if the shoulder is damaged, it can lead to wobble, vibration, and eventually, failure of the connected parts. You’ll notice if one fails – typically through unusual noises, vibrations you didn't have before, or even a complete loss of drive. It’s a small part, but it does a big job maintaining the integrity of the drivetrain. You can often find a good selection of these at places like Fixparts Online, making sure you get the right size and strength for your vehicle. Backed by experts: Shouldered Bolt (MPN N10286110) includes a 12-month warranty!

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