Genuine Scag Mower 3PK Spindle Blade Bolt 5/8-11 X 9-1/2 HH CP SCR Grade 5 / SM-52, STH-13BV, SW-13BV & More / 04001-41

What It Is

This is a genuine Scag blade bolt set (3-pack) used to secure mower blades to the spindle assembly on select Scag zero-turn and walk-behind mowers. Designed for commercial-grade decks requiring a 5/8-11 thread, 9-1/2 inch length, grade 5 hex head cap screw.

Fitment & Compatibility

Before buying:

• Verify your mower deck uses 5/8-11 thread bolts – this is not universal.
• Check bolt length: 9-1/2 inches (some Scag models use 8-inch or 10-inch bolts).
• Fits Scag models: SM-52, STH-13BV, SW-13BV, and others using OEM part 04001-41.
• Not compatible with most aftermarket spindles or non-Scag decks – measure original bolt first.
• Confirm your mower’s serial number range (Scag made running changes; older decks may use different bolts).

Key Things to Know

• Grade 5 strength – adequate for residential/commercial mowing, but not for extreme abuse (e.g., hitting rocks daily).
• Installation torque: 70-90 ft-lbs recommended; use a torque wrench to avoid stripping threads or over-tightening.
• Anti-seize compound recommended on threads to prevent seizing in aluminum spindles.
• Genuine vs aftermarket: aftermarket bolts may be softer steel or slightly different thread pitch – stick with OEM for perfect fit.

Should You Buy It

Buy this if you own a Scag mower listed in the fitment section and need a direct OEM replacement. It’s overkill for occasional residential mowing but essential for commercial operators who can’t risk a bolt snapping mid-job. Skip it if your mower uses a different bolt length or thread size – measure first.