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Description
S04021-09 – SCAG 3/8"-16 Elastic Stop Hex Lock Nut (Genuine OEM Part)
The SCAG S04021-09 Elastic Stop Hex Lock Nut is a genuine OEM 3/8"-16 nylon insert lock nut engineered to provide secure, vibration-resistant fastening on SCAG commercial mowing equipment and grass catcher systems. Designed to maintain consistent clamping force under heavy vibration and continuous operation, this elastic stop nut helps prevent fasteners from backing off during demanding mowing conditions.
Manufactured from high-strength steel with a corrosion-resistant zinc-plated finish, the S04021-09 delivers dependable OEM durability and precise fitment across a wide range of SCAG grass catcher assemblies and mower applications.
Product Details
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Manufacturer Part Number: S04021-09
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Brand: SCAG
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Part Type: Elastic Stop Hex Lock Nut
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Thread Size: 3/8"-16 UNC
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Style: Nylon Insert Lock Nut
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Material: High-Strength Steel
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Finish: Zinc-Plated
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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 hardware
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Heavy-duty nylon locking insert
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Prevents loosening caused by vibration
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Corrosion-resistant zinc finish
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Precision 3/8"-16 threads
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Long service life
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Direct-fit OEM replacement
Function
The SCAG S04021-09 Elastic Stop Hex Lock Nut secures mower and grass catcher components while resisting vibration, shock loads, and repeated operation. Its nylon insert maintains locking tension to help improve reliability and reduce maintenance.
Fits These SCAG Models
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9075-GC-F4 Fabric Grass Catcher
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GC-3B Fabric 3-Bag Grass Catcher (S/N K3300001–K3399999)
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GC-4D Metal Grass Catcher 9054 (2007)
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GC-CS Clam Shell Grass Catcher (S/N K3400001–K3499999)
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GC-F4 Fabric Grass Catcher 9055 (2007)
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GC-F4 Grass Catcher (1995)
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GC-SCZ48/52 Fabric 3-Bag Grass Catcher (S/N J2400001–J2499999)
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GC-SCZ48/52-CS Clam Shell Grass Catcher (S/N J2900001–J2999999)
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GC-SFZ Grass Catcher (S/N E1900001–E1999999)
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GC-SFZ Grass Catcher (S/N E8800001–E8899999)
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GC-SSZ Grass Catcher (S/N 30000)
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GC-SSZ-42 Grass Catcher (S/N 40000)
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GC-SSZ-48 (S/N 3660001–3669999)
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GC-SSZ-48 Grass Catcher (S/N 40000)
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GC-SSZ-5BS Grass Catcher (S/N 40000)
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GC-SSZ-6KH (S/N 3670001–3679999)
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GC-STC Grass Catcher (S/N 6910001–6919999)
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GC-STC Grass Catcher (S/N 8620001–8629999)
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GC-STC Grass Catcher (S/N 9490001–9499999)
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GC-STC Grass Catcher (S/N A7700001–A7799999)
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GC-STC Grass Catcher (S/N B8100001–B8199999)
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GC-STC Grass Catcher (S/N C9100001–C9199999)
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GC-STC Grass Catcher (S/N E1700001–E1799999)
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GC-STC Grass Catcher (P/N 9015)
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GC-STC-61 Grass Catcher (S/N 8780001–8789999)
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GC-STC-61V Fabric 3-Bag Grass Catcher (S/N G8000001–G8099999)
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GC-STC-61V Fabric 3-Bag Grass Catcher (S/N J2500001–J2599999)
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GC-STC-CS Clam Shell Grass Catcher (S/N 8650001–8659999)
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GC-STC-CS Clam Shell Grass Catcher (S/N 9540001–9549999)
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GC-STC-CS Clam Shell Grass Catcher (S/N A8100001–A8199999)
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GC-STC-CS Clam Shell Grass Catcher (S/N B9000001–B9099999)
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GC-STC-CS Clam Shell Grass Catcher (S/N D0000001–D0099999)
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GC-STC-CS Clam Shell Grass Catcher (S/N E1500001–E1599999)
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GC-STC-CS61 Grass Catcher (S/N 8790001–8799999)
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GC-STC-CSV Clam Shell Grass Catcher (S/N B9100001–B9199999)
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GC-STC-CSV Clam Shell Grass Catcher (S/N D0100001–D0199999)
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GC-STC-CSV Clam Shell Grass Catcher (S/N E1600001–E1699999)
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GC-STC-CSV Clam Shell Grass Catcher (S/N G8300001–G8399999)
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GC-STC-CSV Clam Shell Grass Catcher (S/N J2800001–J2899999)
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GC-STC-V Grass Catcher (S/N B8200001–B8299999)
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GC-STC-V Grass Catcher (S/N C9200001–C9299999)
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GC-STC-V Grass Catcher (S/N E1800001–E1899999)
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GC-STC-V Grass Catcher (S/N G7900001–G7999999)
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GC-STC-V Grass Catcher (S/N J2300001–J2399999)
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GC-STT-52 Grass Catcher Series
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GC-STT-52V Grass Catcher Series
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GC-STT-61 Grass Catcher Series
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GC-STT-61V Grass Catcher Series
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GC-STT-72 Grass Catcher Series
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GC-STT-CS52 Clam Shell Grass Catcher Series
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GC-STT-CS52V Clam Shell Grass Catcher Series
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GC-STT-CS61 Clam Shell Grass Catcher Series
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GC-STT-CS61V Clam Shell Grass Catcher Series
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GC-STT-CS72 Clam Shell Grass Catcher Series
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GC-STT/SCZ-61V Fabric 3-Bag Grass Catcher (S/N F6800001–F6899999)
Who Is This For?
Ideal for:
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Commercial landscaping professionals
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Lawn maintenance contractors
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SCAG equipment owners
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Municipal maintenance departments
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Golf course maintenance crews
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Repair technicians
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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Municipal grounds
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Golf courses
Pros
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Genuine SCAG OEM quality
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Nylon insert prevents loosening
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Excellent vibration resistance
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Corrosion-resistant zinc finish
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Heavy-duty steel construction
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Precise OEM fit
Cons
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Designed specifically for 3/8"-16 threaded applications
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Nylon locking insert should be replaced if excessive reuse reduces locking performance
Comparison – Genuine SCAG OEM vs Aftermarket Lock Nuts
SCAG S04021-09 OEM
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Exact factory thread tolerances
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Reliable locking performance
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Long-lasting corrosion protection
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Built for commercial mower applications
Aftermarket Alternatives
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Variable manufacturing tolerances
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Lower locking consistency
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Reduced durability under vibration
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Fitment quality may vary
Why Buy from Barry's Power Equipment?
Barry's Power Equipment supplies genuine SCAG OEM replacement parts backed by expert customer support and fast shipping.
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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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Professional parts support
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Extensive OEM inventory

