Universal Motorcycle Hardware & Fasteners – Metric Bolts, Nuts & Mounting Hardware

Shop motorcycle hardware and fasteners for vintage restorations, engine rebuilds, and routine repairs. This collection includes universal metric bolts, nuts, washers, screws, studs, spacers, and mounting hardware compatible with classic Honda, Yamaha, Suzuki, and Kawasaki motorcycles.

Over time, original fasteners become corroded, rounded, mismatched, or stripped — especially on engine cases, side covers, exhaust mounts, and chassis components. Replacing worn motorcycle hardware ensures proper torque retention, secure mounting, correct alignment, and a clean factory-style finish.

Our inventory includes metric hex bolts, socket head (Allen) bolts, flange bolts, stainless steel fasteners, zinc-plated hardware, lock nuts, flange nuts, washers, threaded studs, and JIS-style screws selected for strength, corrosion resistance, and compatibility with vintage Japanese motorcycles. Multiple thread pitches and sizes are available to match common motorcycle specifications including M5, M6, M8, and M10 applications.

For proper installation and removal — especially when working with JIS screws and factory fasteners — explore our Motorcycle Tools & Accessories collection, which includes JIS screwdrivers, impact drivers, specialty wrenches, and essential garage tools designed for vintage motorcycle service.

Whether you're replacing damaged engine case bolts, refreshing bodywork hardware, or completing a full restoration, these motorcycle fasteners provide dependable clamping force and long-term durability.

Old Bike Barn specializes in vintage Japanese motorcycle parts and restoration components curated by riders who wrench, rebuild, and preserve classic machines.