John Deere (2-Pack) Original Equipment Gauge Wheel Shoulder Bolt - GX21012,2

What It Is

This is a set of two OEM gauge wheel shoulder bolts for John Deere zero-turn mowers. They secure the front gauge wheels to the mower deck, preventing wheel wobble and maintaining consistent cutting height on uneven terrain.

Fitment & Compatibility

Before buying, verify you have a John Deere zero-turn model with a 48-, 54-, or 60-inch deck (e.g., Z445, Z465, Z645, Z655, Z735). This bolt fits only the shoulder position—not the axle or spindle. Measure your original bolt: it should be about 2.5 inches long with a 5/8-inch shoulder diameter and 3/8-16 thread. Cross-check your model’s parts diagram for part number GX21012. Aftermarket bolts may use different shoulder lengths or thread pitch, so stick with OEM for exact match.

Key Things to Know

• Quality: John Deere OEM—hardened steel with zinc coating. Expect longer life than generic bolts, especially under heavy use.
• Installation: Simple—remove the old bolt, slide the new one through the gauge wheel bracket and wheel, then torque to 25–30 ft-lbs. Use a thread locker if your deck vibrates excessively.
• Common gotcha: These are sold as a 2-pack, but some decks use four shoulder bolts (one per wheel). You may need two packs for a full replacement.
• Wear indicator: If your gauge wheels are loose or the deck scrapes, check these bolts first. Stripped threads or a worn shoulder are the usual culprits.

Should You Buy It

Buy these if you own a compatible John Deere zero-turn and need a direct OEM replacement for worn or damaged gauge wheel bolts. They’re a simple, low-cost fix for deck stability and cut quality—right for DIY homeowners or pros who want to avoid aftermarket fit issues. Skip if your deck uses a different bolt size or you only need one bolt (no single-pack option).