Grade A Zinc Plated Nylon Lock Nuts

Grade A vs Grade C nylon lock nuts

The grade tells you the strength. Grade A follows SAE Grade 2, a standard-strength carbon steel for general, non-critical fastening, while Grade C follows SAE Grade 8, a high-strength grade for heavy machinery and demanding loads. Choose Grade A for the everyday assembly, brackets, and light equipment that make up most fastening work, and step up to Grade C only where the bolt and joint call for high strength. Always match the nut grade to the bolt, since a stronger nut does not raise a weaker bolt's capacity. The zinc plating adds corrosion resistance for indoor and general outdoor use.

Why choose Grade A zinc plated nylon lock nuts

• General purpose: standard-strength Grade A for most everyday fastening.
• Economical: the cost-effective choice for common jobs.
• Vibration locking: the nylon insert grips the threads to resist loosening.
• Zinc plated: added corrosion resistance for indoor and general outdoor use.

Common applications for Grade A nylon lock nuts

• General assembly and maintenance
• Brackets, guards, and frames
• Light equipment and machinery
• Indoor and dry outdoor fastening

For high-strength joints, see Grade C yellow zinc nylon lock nuts, and browse every material on the main lock nuts category.

Grade A Zinc Plated Nylon Lock Nuts FAQ

What does Grade A mean?

Grade A is a standard-strength nut that follows SAE Grade 2, suited to general, non-critical fastening. Grade C, by contrast, follows SAE Grade 8 for high-strength use.

Are Grade A nylon lock nuts good outdoors?

The zinc plating gives corrosion resistance for indoor and general dry outdoor use. For wet, coastal, or saltwater exposure, choose a stainless nylon lock nut.

Should I match the nut grade to the bolt?

Yes. Match Grade A nuts to standard-strength bolts. A higher-grade nut does not increase a weaker bolt's capacity, so pairing grades is best.