Scag 3-Pack Spindle Blade Bolts 5/8-11 x 9-1/2 — Grade 5 Hex Head OEM 04001-41 for SM-52, STH-13BV, SW-13BV

Genuine Scag hex-head spindle blade bolts (5/8-11 x 9-1/2) — three Grade 5 bolts sold as a direct-fit replacement for many Scag walk-behind and zero-turn mower spindles.

These bolts are made to the OEM specification and packaged as a 3-pack (Scag part #04001-41) for routine blade spindle maintenance or mid-season rebuilds. They replace the hex-head fasteners that secure blades to the spindle assembly on a wide range of Scag models, offering the correct thread size, length and strength rating (Grade 5) needed for safe, reliable blade retention.

Which Scag mowers will these bolts fit?

This three-pack is intended to match the original 5/8-11 x 9-1/2 hex head spindle bolt used across many Scag models. Check your owner’s manual or parts diagram to confirm the OEM part number before ordering.

• Fits many models including SM-52, STH-13BV, SW-13BV and larger stand-on and zero-turn models listed in the official fitment details.
• Packaged as three bolts to service multiple spindles or keep spares on hand.
• May also fit additional models or aftermarket spindles that use the same thread and length.

How do these bolts perform and what are they made from?

These are Grade 5 hex-head bolts sized 5/8-11 x 9-1/2, engineered for the shear and tensile loads encountered in mower blade retention. Grade 5 provides a balance of strength and toughness suitable for many commercial and residential cutting decks.

• Grade 5 carbon-steel construction for dependable clamping strength.
• Hex head design allows installation with standard sockets or impact tools.
• Correct thread pitch (11 TPI) and 9-1/2" length for OEM spindle stacks on specified Scag models.

What should I check before installing these replacement bolts?

Always verify the original Scag part number on your mower’s parts diagram and inspect mating surfaces before installation. Replace hardware in matched sets where required and follow torque specifications from your service manual.

• Confirm part #04001-41 matches the bolt location in your manual or parts diagram.
• Inspect spindle, washers and blade for wear; replace damaged parts to ensure safe clamping.
• Tighten to the manufacturer torque spec and use a new locking washer or nut where applicable.

Why buy the OEM Scag bolt instead of a generic fastener?

OEM bolts are manufactured to the same dimensions and strength class as the original fasteners that came with the machine, which helps preserve fit, balance and safe blade retention. Choosing the genuine Scag part reduces uncertainty about fitment, hardening, and durability under cutting loads.

• Factory-correct dimensions and Grade 5 strength reduce compatibility issues.
• Sold in a three-pack to replace multiple spindles or keep as service spares.
• Backed by the Scag part numbering for easier parts tracking and ordering.

Who is this for? This 3-pack of Scag spindle blade bolts is ideal for professional landscapers, grounds crews and homeowners who service Scag mowers and need OEM-grade replacement hardware. Buy this set if you want exact-fit, Grade 5 bolts to restore proper blade retention on compatible Scag models or to keep spare, factory-spec fasteners on hand during seasonal maintenance.