18 products
NI Series Bearing Locknuts – Inch, 16 TPI
The NI series is the bearing locknut for shafts cut to the 16 threads-per-inch National Fine series rather than the standard bearing thread. The finer pitch gives more turns per inch of travel and therefore finer preload resolution, and it is often what you will find on fractional-bore shafting. Each NI nut is matched to a WI series lockwasher.
NI Series Specifications
- Part numbers: NI-01 through NI-18 (18 sizes stocked)
- Bore / shaft size: 0.75 in to 3.75 in
- Outside diameter: 1.5 in to 5.25 in
- Material & temperature: Carbon steel, black oxide finish; 300°F maximum operating temperature
- Standards: ANSI/ABMA 8.2-1999; made in USA, RoHS compliant
Applications
Fractional-bore shafting in machine tools, spindles and rebuilt drives where the shaft carries a 16 TPI National Fine thread.
Related Whittet-Higgins Series
- WI Series Bearing Lockwashers – 16 TPI
- BHI Series BEARHUG Locknuts – 16 TPI
- BASI / BAST Series Bearing Assembly Sockets – 16 TPI & Small Profile
- N / AN Series Bearing Locknuts – Inch, SAE
Apollo is an authorized Whittet-Higgins distributor. Every part on this page is genuine Whittet-Higgins, manufactured in the USA. Need a size that is not listed, or help matching a locknut to its lockwasher and assembly socket? Contact our team.
