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Description
S48679 – Castle Nut (Genuine Scag OEM Fastener)
The Scag S48679 Castle Nut is a genuine OEM replacement fastener engineered to securely retain shafts, spindles, wheel hubs, steering components, and other critical assemblies on compatible Scag commercial lawn mowers. Manufactured to Scag's exact factory specifications, this precision-machined castle nut features castellated slots that align with a cotter pin, providing a secure, vibration-resistant connection that helps prevent loosening during operation.
Constructed from high-strength steel with a corrosion-resistant finish, the S48679 Castle Nut is built to withstand heavy loads, continuous vibration, and harsh outdoor environments. Using a genuine Scag OEM castle nut ensures proper fit, safe operation, and long-term reliability.
Product Details
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Part Number: S48679
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Brand: Scag
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Part Type: Castle Nut
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Function: Secures shafts and rotating assemblies using a cotter pin locking system
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Material: High-Strength Hardened Steel
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Finish: Corrosion-Resistant Zinc Coating
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Installation: Direct OEM Replacement
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OEM Status: Genuine Scag OEM Part
Key Features
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Genuine Scag OEM castle nut
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Precision-machined for exact OEM fit
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Castellated design allows cotter pin locking
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High-strength hardened steel construction
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Excellent resistance to vibration and loosening
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Corrosion-resistant zinc finish
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Direct replacement with no modifications required
Function
The S48679 Castle Nut is used to secure rotating and pivoting components while allowing the use of a cotter pin to lock the nut in place. This design helps prevent accidental loosening caused by vibration, improving safety and maintaining proper component alignment during operation.
Compatible Equipment
The Scag S48679 Castle Nut is used on selected Scag commercial equipment, including various:
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Scag zero-turn mowers
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Scag stand-on mowers
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Scag walk-behind mowers
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Scag riding mowers
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Other Scag equipment utilizing OEM part number S48679
It is commonly found in applications involving:
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Front caster wheel assemblies
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Steering linkage components
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Deck linkage systems
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Pivot shafts
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Wheel hubs
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Other rotating or pivoting assemblies
Always verify your equipment model, serial number, and illustrated parts diagram before ordering to ensure proper compatibility.
Who Is This For?
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Commercial landscapers
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Lawn care professionals
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Equipment repair technicians
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Fleet maintenance departments
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Municipal grounds crews
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Scag equipment owners
Pros
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Genuine Scag OEM quality
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Secure cotter pin locking design
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Precision-machined hardened steel
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Excellent vibration resistance
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Corrosion-resistant finish
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Factory-correct fit
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Long service life
Cons
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Compatible only with applications designed for this specific castle nut
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A new cotter pin is recommended whenever the nut is removed and reinstalled
Comparison – Scag S48679 OEM Castle Nut vs Aftermarket Castle Nuts
Scag S48679 Genuine OEM Castle Nut
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Exact OEM thread specifications
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Precision-machined castellations
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Premium hardened steel construction
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Superior corrosion resistance
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Designed specifically for Scag equipment
Aftermarket Castle Nuts
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May vary in thread tolerances and material quality
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Variable corrosion protection
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Potential fitment inconsistencies
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Reduced durability under heavy-duty commercial use
Why Buy from Barry's Power Equipment?
Barry's Power Equipment is an authorized Scag dealer supplying genuine OEM replacement parts trusted by commercial landscapers and professional equipment technicians.
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Genuine OEM Scag replacement parts
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Fast nationwide shipping
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Competitive pricing
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Expert technical support
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Extensive inventory for Scag, Toro, Exmark, Wright, Ariens, Gravely, Hydro-Gear, Briggs & Stratton, Kawasaki, Kohler, Honda, Ferris, Hustler, Cub Cadet, John Deere, STIHL, and many other leading outdoor power equipment brands.

