M9 X 1.25 BMW 328 E46 Rod Bolt Kit
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MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
Product Details
When prepping a BMW naturally aspirated inline-six for Spec E46, endurance racing, or forced induction, the factory bottom end faces intense stress. Specifically, high-RPM track abuse puts a massive strain on the connecting rod hardware. The ARP Pro Series Rod Bolt Kit replaces the weak OEM stretch bolts with premium, race-grade fasteners designed to prevent catastrophic bottom-end failure.
Engineered from proprietary ARP2000® alloy, these M9 x 1.25 fasteners provide the massive clamping force needed to keep the rod journals perfectly round and seated, even when bouncing off the rev limiter lap after lap.
Key Features & Technical Specifications
Premium Material: Forged from ARP2000® alloy steel, an advanced material formulated to withstand extreme stress cycles.
Tensile Strength: Rated at 220,000 psi, vastly outperforming factory steel and providing a crucial safety margin over stock hardware.
Precision Thread Rolling: Threads are rolled after heat treatment to ensure maximum fatigue strength and a massive reduction in stress concentration.
High-RPM Stability: Eliminates rod cap fretting and prevents the rod bore from distorting into an oval shape during high inertial loads.
Engineered for Motorsport: Fully reusable, making them the industry standard for competitive racing programs that require routine mid-season engine tear-downs.
Why Racing Teams Upgrade the E46 Bottom End
The Problem: The BMW M52TU and M54 engines are legendary for their smooth power delivery, but the OEM factory rod bolts are Torque-to-Yield (TTY). At high RPMs, inertial forces try to rip the rod cap away from the rod body. Factory bolts will stretch over time, losing their clamping load and causing spun rod bearings.
The Solution: The ARP Pro Series kit delivers a substantial increase in clamping load. By securing the rod caps with 220,000 psi alloy steel, these fasteners ensure the rod bearings stay perfectly clearanced, protecting your crankshaft and engine block under grueling endurance conditions.
Prop 65 Warning
