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Description
S04021-22 – SCAG 5/16-18 Grade 8 Elastic Stop Lock Nut (Genuine OEM Part)
The SCAG S04021-22 Elastic Stop Lock Nut is a genuine OEM 5/16"-18 Grade 8 nylon insert lock nut engineered to provide a secure, vibration-resistant fastening solution for SCAG commercial and residential lawn equipment. Featuring a durable elastic (nylon) locking insert and heavy-duty Grade 8 steel construction, this lock nut helps prevent loosening caused by engine vibration, deck rotation, and continuous commercial mowing.
Built to SCAG's strict OEM specifications, the S04021-22 delivers exceptional clamping strength, corrosion resistance, and long-lasting durability, making it ideal for securing deck components, frame assemblies, suspension hardware, brackets, and other critical mower systems.
Product Details
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Manufacturer Part Number: S04021-22
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Brand: SCAG
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Part Type: Elastic Stop Lock Nut
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Thread Size: 5/16"-18 UNC
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Style: Nylon Insert Lock Nut
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Grade: Grade 8
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Material: Heat-Treated High-Strength Steel
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Finish: Corrosion-Resistant Protective Coating
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OEM Status: Genuine SCAG OEM Part
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Installation: Direct OEM replacement
Key Features
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Genuine SCAG OEM replacement hardware
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Heavy-duty Grade 8 construction
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Precision 5/16"-18 UNC threads
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Integrated nylon insert prevents loosening
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Excellent resistance to vibration and shock loads
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Corrosion-resistant finish for extended service life
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Ideal for high-stress commercial mower applications
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Direct OEM replacement with factory fit
Function
The SCAG S04021-22 Elastic Stop Lock Nut securely fastens threaded assemblies while the nylon insert maintains constant locking pressure, reducing the chance of fastener loosening during heavy-duty mower operation and prolonged vibration.
Compatible SCAG Equipment
The SCAG S04021-22 Lock Nut is used on numerous SCAG mower models and assemblies, including:
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SCAG Turf Tiger
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SCAG Turf Tiger II
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SCAG Cheetah
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SCAG Cheetah II
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SCAG Tiger Cat
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SCAG Tiger Cat II
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SCAG Patriot
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SCAG Freedom Z
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SCAG Liberty Z
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SCAG V-Ride
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SCAG V-Ride II
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SCAG V-Ride XL
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SCAG Wildcat
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SCAG SWZ Series
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SCAG Walk-Behind Mowers
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Additional SCAG equipment utilizing 5/16"-18 Grade 8 elastic stop lock nuts
Always verify compatibility using your equipment model and serial number before ordering.
Who Is This For?
Ideal for:
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Commercial landscaping contractors
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Professional lawn care companies
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Equipment repair technicians
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Municipal maintenance departments
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Golf course maintenance crews
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Homeowners maintaining SCAG equipment
Recommended Property Size
Suitable for:
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Residential properties
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Large estates
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Commercial landscapes
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Parks
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Sports complexes
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Golf courses
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Municipal grounds
Pros
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Genuine SCAG OEM quality
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Heavy-duty Grade 8 strength
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Nylon insert resists loosening
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Excellent vibration resistance
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Corrosion-resistant finish
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Direct OEM replacement
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Long service life under demanding conditions
Cons
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Designed specifically for 5/16"-18 threaded applications
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Nylon insert should be replaced if its locking capability is reduced after repeated reuse
Comparison – Genuine SCAG OEM vs Aftermarket Lock Nuts
SCAG S04021-22 Genuine OEM
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Exact factory thread tolerances
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Grade 8 high-strength steel
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Premium nylon locking insert
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Superior corrosion resistance
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Guaranteed OEM fit and performance
Aftermarket Alternatives
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Lower-grade materials may be used
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Locking insert quality can vary
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Less consistent fit and durability
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Reduced resistance to vibration over time
Why Buy from Barry's Power Equipment?
Barry's Power Equipment is an authorized SCAG dealer offering genuine OEM replacement parts for professional lawn equipment.
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Genuine SCAG OEM parts
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Authorized SCAG dealer
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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 of genuine SCAG replacement parts
Choose the SCAG S04021-22 Genuine OEM 5/16"-18 Grade 8 Elastic Stop Lock Nut to maintain secure fastening, dependable vibration resistance, and long-lasting reliability for your SCAG mower.

