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Heavy Hex Jam Nut, A563 Grade A, Plain (Inch)
Heavy Hex Jam Nuts in A563 Grade A (Plain Finish) are low-profile, heavy-pattern nuts designed for locking and adjustment applications in general-purpose construction and industrial assemblies. Manufactured to ASTM A563 Grade A specifications, these jam nuts offer dependable strength and are commonly paired with heavy hex nuts to prevent loosening under vibration or load.
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With their larger heavy-hex footprint and plain, uncoated finish, these jam nuts are ideal for indoor or controlled environments where corrosion resistance is not a primary requirement. Their reduced height makes them suitable for positioning, leveling, and secondary locking functions across structural, machinery, and equipment applications.
