Grade C Yellow Zinc Plated Nylon Lock Nuts

Grade C vs Grade A nylon lock nuts

Grade C follows SAE Grade 8, a high-strength carbon or alloy steel rated up to around 150,000 psi, built for heavy machinery, automotive, and demanding structural loads. Grade A follows SAE Grade 2, a standard grade for general fastening. Choose Grade C when the bolt is a Grade 8 or the joint carries heavy load and vibration, and Grade A for everyday work. The yellow zinc plating offers more corrosion resistance than clear zinc and is a common visual cue for higher-strength hardware. Match the nut grade to the bolt for a balanced joint.

Why choose Grade C yellow zinc nylon lock nuts

• High strength: Grade C follows SAE Grade 8 for heavy-duty loads.
• Vibration locking: the nylon insert grips the threads to resist loosening.
• Yellow zinc plated: added corrosion resistance and a high-strength cue.
• Grade 8 match: pairs with high-strength Grade 8 bolts.

Common applications for Grade C nylon lock nuts

• Heavy machinery and equipment
• Automotive and truck assembly
• Structural and high-load joints under vibration
• Demanding industrial fastening

For standard-strength jobs, see Grade A zinc nylon lock nuts, and browse every material on the main lock nuts category.

Grade C Yellow Zinc Plated Nylon Lock Nuts FAQ

What does Grade C mean?

Grade C is a high-strength nut that follows SAE Grade 8, suited to heavy-duty and high-load fastening. Grade A, by contrast, follows SAE Grade 2 for general use.

Why is the zinc yellow instead of clear?

Yellow zinc plating offers more corrosion resistance than clear zinc and commonly signals a higher-strength grade, making Grade C hardware easy to identify.

Should I match Grade C nuts to Grade 8 bolts?

Yes. Pair Grade C nuts with high-strength Grade 8 bolts so the joint is balanced. A stronger nut does not raise a weaker bolt's capacity.