What material are these main bolts made from?

These main bolts are constructed from 8740 chromoly steel. This material is heat-treated, quenched, and tempered to provide a significant increase in tensile strength over standard fasteners.

Why are rolled threads important for engine bolts?

Rolled threads are created by pressing the thread form into the bolt material, which preserves the grain structure. This process results in stronger threads that are less prone to stripping or failure under the high stresses found in an engine.

What is the benefit of using stronger main bolts in an engine build?

Stronger main bolts ensure the crankshaft remains properly aligned under increased loads, which can occur during engine modifications or high-performance driving. This helps prevent bearing damage and maintains engine integrity.

ARP Subaru 2.0L FA20 Main Bolt Kit 260-5001

Name: ARP Subaru 2.0L FA20 Main Bolt Kit
Brand: ARP
SKU: arp-arp-subaru-2-0l-fa20-main-bolt-kit-t14-4355625
Price: 451.88 USD
Availability: InStock

ARP Subaru 2.0L FA20 Main Bolt Kit

$451.88

Only 3 left in stock

ARP Subaru 2.0L FA20 Main Bolt Kit 260-5001. Stronger than stock fasteners for your Subaru engine build.

Key Features

Fits Subaru 2.0L FA20 engines.
Constructed from 8740 chromoly steel for increased tensile strength.
Heat-treated, quenched, and tempered for optimal performance.
Rolled threads provide superior strength compared to cut threads.
Designed to secure the crankshaft main bearings.
Includes all necessary main bolts for the specified engine.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

ARP's 260-5001 main bolt kit uses 8740 chromoly steel, a well-built material that offers a notable increase in tensile strength over standard OEM fasteners. This is crucial when you're rebuilding or modifying your Subaru's 2.0L FA20 engine, as the main bearings are critical for keeping the crankshaft properly aligned under higher loads.

These bolts are heat-treated and then quenched and tempered to achieve their impressive strength. ARP also rolls the threads on these bolts, which is a stronger process than cutting threads, as it preserves the material's grain structure. This means the threads are less likely to strip or fail under stress. The kit includes all the necessary main bolts to secure your crankshaft, ensuring a solid foundation for your engine build.

When installing these bolts, it's important to follow ARP's specific torque-down sequence and lubrication recommendations, which are included with the kit. This ensures the bolts stretch properly and apply even clamping force to the main bearing caps, which is vital for engine longevity.