5/8"-11x2 1/4" Blades Cutting Edges Plow Bolts & Nuts Fits Snow Plow Construction Machinery Grade 8 Dome Head 260123 (2 Pack)

What It Is

These are heavy-duty 5/8"-11 x 2 1/4" Grade 8 dome head plow bolts with matching nuts (2-pack), designed for securing cutting edges on snow plows, construction machinery, and heavy-duty mower decks—not for standard lawn mower blade mounting.

Fitment & Compatibility

• Measurements: 5/8" diameter thread (coarse 11 TPI), 2 1/4" bolt length (underside of head to tip). Dome head profile is low-crown for flush fit on cutting edges.
• What to check: Verify your blade or cutting edge mounting holes are 5/8" (not 1/2" or 3/8"). Measure the thickness of your blade/edge plus any washers—total stack height must be less than 2 1/4" for threads to engage fully.
• Common uses: Snow plow blades, grader edges, skid steer bucket edges, heavy-duty mower decks with thick steel blades (e.g., zero-turn, commercial). Not for standard residential walk-behind mowers (those typically use 3/8" or 1/2" bolts).
• OEM vs aftermarket: Generic Grade 8 hardware—no specific OEM fit. Works if dimensions match.

Key Things to Know

• Grade 8 strength is overkill for most mowers, but ideal for snow plow/construction edges where shear loads are high.
• Installation: Use a wrench on the square neck under the dome head to prevent spinning. Torque to 60-80 ft-lbs (check equipment manual). No lock washers needed—Grade 8 nuts have built-in nylon insert or serrated flange (verify supplied nut type).
• Common gotcha: 2 1/4" length may be too short if you add thick washers or a spacer. Measure stack height before buying. Also, dome head may not sit flush in counterbored holes on some mower blades—test fit.
• Pack size: 2-pack, so buy multiple sets if you have more than 2 bolts per blade/edge.

Should You Buy It

Buy if you need replacement hardware for a snow plow cutting edge, construction bucket, or heavy-duty mower deck that uses 5/8" bolts and requires Grade 8 strength. Skip if you have a standard residential mower—those use smaller bolts (usually 3/8" or 1/2") and don’t need this level of hardware.