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Description
S04020-28 – SCAG 1/2"-20 UNF-2B Left-Hand Jam Nut, Zinc (Genuine OEM Part)
The SCAG S04020-28 Jam Nut is a genuine OEM 1/2"-20 UNF-2B left-hand thread jam nut engineered to secure rotating assemblies and threaded components on compatible SCAG commercial lawn mowers. Its low-profile jam nut design provides reliable locking when used with left-hand threaded shafts or hardware, helping prevent loosening caused by blade rotation, drivetrain movement, and constant vibration during heavy-duty mowing.
Manufactured from high-strength steel and finished with corrosion-resistant zinc plating, the S04020-28 delivers precise OEM fitment, dependable durability, and long service life in demanding commercial environments.
Product Details
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Manufacturer Part Number: S04020-28
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Brand: SCAG
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Part Type: Left-Hand Jam Nut
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Thread Size: 1/2"-20 UNF-2B
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Thread Direction: Left-Hand (LH)
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Style: Hex Jam 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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Precision-machined left-hand 1/2"-20 UNF threads
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Thin-profile jam nut for secure locking applications
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High-strength steel construction
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Zinc-plated for corrosion resistance
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Designed for commercial-duty equipment
Function
The SCAG S04020-28 Left-Hand Jam Nut is used to lock rotating shafts and threaded assemblies in place where left-hand threads are required. Its jam nut design helps maintain proper clamping force while resisting loosening caused by vibration and rotational forces.
Who Is This For?
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Commercial landscapers
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Lawn maintenance professionals
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SCAG mower owners
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Equipment repair technicians
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Fleet maintenance departments
Recommended Property Size
Suitable for residential, estate, commercial, municipal, golf course, sports field, and professional turf maintenance equipment using compatible SCAG OEM components.
Pros
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Genuine SCAG OEM quality
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Precision left-hand thread design
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Heavy-duty steel construction
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Corrosion-resistant zinc finish
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Reliable locking performance
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Exact OEM fit
Cons
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Fits only compatible 1/2"-20 UNF left-hand threaded applications
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Not interchangeable with standard right-hand thread nuts
Comparison – Genuine SCAG OEM vs Aftermarket
SCAG S04020-28 OEM
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Exact factory specifications
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Accurate left-hand thread machining
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Superior durability
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Engineered for commercial equipment
Aftermarket Alternatives
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May have inconsistent thread tolerances
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Lower-quality materials
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Reduced long-term reliability
Why Buy from Barry's Power Equipment?
Barry's Power Equipment supplies genuine SCAG OEM replacement parts trusted by professional landscapers and commercial equipment owners.
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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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Knowledgeable technical support
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Extensive OEM parts inventory
