HEX Bolt 90105-960-710 and 90502-VG3-000 Washer Set,Grade 8.8 Carbon Steel Bolt + Manganese Steel Washer,Compatible with Honda HRR216, HRS216, HRT216, HRB216, HRB217, HRX217 Mowers（2 Pack）

What It Is

This is a set of two Grade 8.8 hex bolts (90105-960-710) and two manganese steel washers (90502-VG3-000) used to secure the blade to the crankshaft on select Honda walk-behind mowers. It’s a direct replacement for the factory hardware that holds the blade in place during operation.

Fitment & Compatibility

These bolts are designed specifically for Honda mower models with a 21-inch deck and a GCV or GXV engine series. Compatible models include HRR216, HRS216, HRT216, HRB216, HRB217, and HRX217. Before buying, check your mower’s model number (e.g., HRR216K9) and confirm the bolt size: the OEM bolt is M10 x 1.25 thread pitch, 25mm long, with a 12mm hex head. The washer is a flat style, 25mm outer diameter, 10.5mm inner diameter. If your mower uses a different bolt (e.g., M8 or a different length), this set won’t fit. Measure your old bolt’s thread pitch and length to be sure.

Key Things to Know

• Grade 8.8 strength – These are stronger than standard hardware store bolts, necessary for the high torque and vibration of blade operation. Do not substitute with lower-grade bolts.
• Manganese steel washer – The washer is harder than standard washers, helping prevent deformation under load. It’s critical to use the correct washer to avoid blade wobble.
• Installation tip – Torque the bolt to 36–43 ft-lbs (Honda spec). Over-tightening can strip the crankshaft threads; under-tightening can cause blade loosening. Use a torque wrench.
• Common gotcha – Many users report that aftermarket bolts may have slightly different head height or washer fit. If the bolt doesn’t sit flush or the washer binds, stop and verify compatibility.

Should You Buy It

This set is a good buy if you need a direct replacement for worn or lost Honda blade hardware and want the correct Grade 8.8 rating. It’s not a universal part—only buy if your mower is on the compatibility list. If your bolt is intact and just needs a new washer, you can often buy the washer separately. For $9.69, it’s a fair price for the convenience of a matched set.