PRODUCT DETAILS
Honda Idler Pulley Bolt – 90031-PRA-000
If you’re messing with your accessory drive, don’t reuse a sketchy fastener. This Honda idler pulley bolt 10x25 (10mm diameter, 25mm length), part number 90031-PRA-000, is the exact OEM Honda pulley bolt that secures the idler pulley on a ton of K- and R-series engines. It’s the correct hardware for K20Z3 idler pulley bolt duty on the 06–11 Civic Si, K20A3 idler bolt replacement on the EP3 Civic Si, and for the R18Z idler pulley bolt on later non-Si cars and crossovers. If you’re doing an accessory belt refresh or full front-end tear-down, this is the genuine Honda pulley bolt you actually want to torque down.
Honda uses this same Honda accessory drive bolt across several popular models: the 2002–2011 Civic Si (EP3 & 06–11 Civic Si bolt), 2012–2015 Civic (non-Si), 2013–2015 Acura ILX (auto), 2009 Acura TSX pulley bolt applications, and the 2016–2022 Honda HR-V pulley bolt setup. Because it’s a genuine Honda idler pulley bolt (OEM, part number 90031-PRA-000, SKU: OHA-90031-PRA-000), you get the same material, coating, and thread engagement Honda spec’d from the factory, no guessing on random aftermarket hardware that “kinda fits” but doesn’t match OE spec.
This Civic Si idler bolt supports the idler pulley assembly on the EP3 Civic Si K20A3, the 06–11 Civic Si K20Z3, and engines in the R18Z family, along with matching Acura ILX idler bolt and Acura TSX pulley bolt applications. If your original Honda idler bolt 10x25 is rounded, rusted, over-torqued, or straight-up missing, swapping to this OEM Honda pulley bolt is the smart move for long-term reliability and correct clamp load. We run these exact bolts on our own Hondas because the accessory drive is not where you want to find out your hardware was “close enough.”
Key Features
- Genuine Honda pulley bolt (90031-PRA-000) – real OEM Honda hardware, not a generic substitute
- Correct 10x25 sizing – 10mm diameter, 25mm length for proper thread engagement on the idler bracket
- Wide compatibility – fits 06–11 Civic Si bolt locations, EP3 Civic Si idler bolt spots, Acura ILX idler bolt use, Acura TSX pulley bolt applications, and R18Z / HR-V setups
- Ideal replacement – fixes stripped, corroded, or stretched Honda idler pulley bolts before they cause belt issues
- Keeps the belt where it belongs – maintains secure pulley alignment so your accessory belt tracks straight and doesn’t chirp or walk
- Direct-fit Honda accessory drive bolt – threads in like stock, no modification or guessing on length or pitch