Bearing Locknut — N-08
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The N-08 Bearing Locknut is an imperial-threaded shaft locknut used for bearing retention, adapter sleeve assemblies, and industrial power transmission applications. It is designed to secure bearings or rotating components onto a shaft and help prevent axial movement under vibration, rotation, and load cycling.
This locknut is used with a matching W-08 multi-tang lockwasher. After the nut is tightened, one washer tang is bent into one of the four locknut slots to create a positive mechanical lock.
Key Features
- Industry-standard slotted bearing locknut.
- Part number: N-08.
- Alternate typed format: N08.
- Imperial thread profile: 1.563 in. x 18 TPI.
- Four-slot outer profile for hook or impact spanner wrench use.
- Used for bearing retention and shaft locking applications.
- Designed to pair with a matching W-08 lockwasher.
- Helps prevent loosening in rotating equipment and vibration-prone assemblies.
- Interchangeable with equivalent standardized N-08 locknuts where dimensions match.
Technical Specifications
- Locknut type: threaded bearing / shaft locknut
- Part number: N-08
- Thread profile: 1.563 in. x 18 TPI
- Outer diameter: 2.250–2.255 in. / approximately 57.3 mm
- Face diameter: 2.000 in.
- Thickness / overall width: 0.438–0.448 in. / approximately 11.4 mm
- Slot count: 4 outer locking slots
- Required lockwasher: W-08 series
- Standard reference: ANSI / ABMA-style industrial bearing locknut dimensions
Application Compatibility
Common application context includes bearing and shaft assemblies where N-08, N08, or an approved equivalent is specified, including:
- Industrial bearing retention assemblies.
- Adapter sleeve and withdrawal sleeve installations.
- Gearbox and rotating shaft equipment.
- Power transmission assemblies.
- Pump, motor, fan, and machinery bearing locations.
- Shaft-mounted component retention where a slotted locknut and tang washer system is required.
Use this locknut only where the shaft thread, lockwasher size, bearing arrangement, and equipment service manual confirm N-08 compatibility.
Fitment Notice
Confirm thread size, shaft diameter, lockwasher series, bearing arrangement, keyway requirement, and spanner tool clearance before ordering. Bearing locknuts are dimension-specific and should not be selected by outside diameter alone.
This nut requires a matching W-08 lockwasher and a shaft or adapter sleeve arrangement designed to accept the washer’s internal tang. Without the correct washer and keyway setup, the locknut cannot be mechanically locked in place.
When This Part Needs Replacement
Replace the locknut if the threads are worn, galled, stretched, cross-threaded, corroded, cracked, rounded, or if the locking slots are damaged. Replacement is also recommended during bearing service if the nut no longer tightens smoothly or if the lockwasher tang cannot seat securely in the nut slot.
A damaged or incorrectly matched locknut can allow bearing movement, shaft misalignment, vibration, heat buildup, or premature bearing failure.
Installation Notes
Clean the shaft threads, bearing seat, and lockwasher area before installation. Thread the nut on by hand first to confirm proper engagement, then tighten using the correct hook spanner, impact spanner, or approved bearing service tool according to the equipment manufacturer’s bearing setting procedure.
Install the matching W-08 lockwasher in the correct orientation. After final adjustment, bend one washer tang firmly into one of the four locknut slots. Do not reuse a lockwasher tang that has been repeatedly bent or no longer holds securely.
Alternate / Cross-Reference Part Numbers
- N-08 — primary locknut reference
- N08 — alternate typed format
- SKF N 08 — cross-reference reference; verify dimensions
- Timken N08 — cross-reference reference; verify dimensions
- Timken TN08 — cross-reference reference; verify dimensions
- Whittet-Higgins N-08 — cross-reference reference; verify dimensions
- W-08 — matching lockwasher reference
Parts Desk Insight
The important fitment checks are the 1.563 in. x 18 TPI thread, the matching W-08 lockwasher, and the shaft or sleeve keyway that allows the washer to lock properly. The nut supplies the bearing retention force, while the washer tang prevents the nut from backing off under vibration.
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Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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