Top Lock Nut
3/8"-16 ECOGUARD® Finish Steel Top Lock Nut for Grade 9 Applications
Fastenal Part No. (SKU)
This is a Catalog Item
Wholesale: $1.20 / each
Online Price: $0.78 / each
Product Attributes
Dia/Thread Size 3/8"-16
Finish EcoGuard®
Grade 9
Material Steel
System of Measurement Imperial (Inch)
Thickness 0.415"
Thread Coarse
Type Top Lock Nut
Wrench Size 9/16"
Product Weight 0.0189
UOM each
Catalog Page BBV11, Page 01-122

Download EcoGuard® Product Standard

Uniquely shaped threads provide a vibration resistant friction fit, so the nut stays put. These all metal locknuts withstand higher temperatures than nylon insert locknuts. Top thread section is deformed to create two or three locking zones; they start easily by hand, then must be wrenched into final position. Grade 9 is stronger than Grade C, Grade 8. ANSI B1.1 UNC or UNF Class 2B thread requirement. FNL Grade 9 Fasteners are coated with a EcoGuard®™ Coating that meets 1000 hours of salt spray corrosion resistance.


  • Comes coated with an EcoGuard® finish that meets 1000 hours of salt spray corrosion resistance. Also has stronger tensile strength than grade 8 fasteners.

General Fastening applications where high strength and/or superior corrosion resistance is needed.
Supply Chain
  • Direct Ship Ships TOMORROW
  • Some restrictions apply, login to see shipping methods.