19 products
N-000 Series Bearing Locknuts – Large Bore, Small Profile
The N-000 series covers the large-bore end of the inch locknut range — from roughly 4-3/8 in up past 14-7/8 in — in a deliberately reduced axial profile. Where a standard N nut of that bore would not fit the space available, an N-000 nut carries the same thread and the same ANSI/ABMA compliance in a shorter body, locked either by a W-000 small-profile lockwasher or by a PP series lockplate and wire.
N-000 Series Specifications
- Part numbers: N-022 through N-076 (19 sizes stocked)
- Bore / shaft size: 4.325 in to 14.921 in
- Outside diameter: 5.312 in to 17.755 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
Large-bore bearing seats in rolling mills, paper machines, marine propulsion, crushers and heavy gear drives where axial space at the bearing is tight.
Related Whittet-Higgins Series
- W-000 / WT Series Bearing Lockwashers – Small Profile
- PP / PPM Series Bearing Lockplates
- N / AN Series Bearing Locknuts – Inch, SAE
- NT Series Bearing Locknuts – Inch, Small Profile
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.

