Product Description
The 570186/F Crank Pin is an essential part of the crankshaft assembly. In the UCE platform, the crank pin is a “press-fit” component that must maintain incredibly tight tolerances to ensure the connecting rod rotates smoothly without excessive “play” or friction.
The suffix “/F” represents the latest engineering revision, optimized for better oil flow and surface hardness compared to older variants (like the /D or /E). This pin is manufactured from high-tensile hardened steel and features a precision-ground surface to reduce wear on the big-end bearing. Failure of this part usually manifests as a distinct “metallic knocking” sound from the bottom end of the engine.
Key Features:
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High-Hardness Steel: Surface-hardened to resist the constant impact and friction of the big-end bearing.
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Precision Oil Channels: Includes specialized oil pathways to ensure the big-end bearing is constantly lubricated under high pressure.
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Standard Size: This is the standard diameter pin for original factory crankshafts.
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UCE Optimized: Specifically designed for the 350cc and 500cc UCE motors, balancing the weight and inertia required for the signature “thump.”
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OEM Reliability: 100% original part ensures perfect press-fit alignment, preventing crankshaft imbalance.
Technical Specifications:
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Part Number: 570186/F (Supersedes 570186/E and 570186/D)
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Material: Hardened Alloy Steel
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Diameter: Standard (approx. 35mm)
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Application: Crankshaft Assembly / Big End Connection
Vehicle Compatibility:
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Royal Enfield Classic 350 / 500 (All UCE Variants)
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Royal Enfield Bullet 350 / 500 (UCE Models)
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Royal Enfield Thunderbird 350 / 500 / 350X / 500X
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Royal Enfield Electra 350 (UCE)
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Note: This is not compatible with older “Cast Iron” engines or the newer “J-Series” (Reborn/Meteor) engines.











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