Bearing Locknut — N-05
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The N-05 Bearing Locknut is an imperial-threaded shaft locknut used to position, secure, and retain bearings, adapter sleeves, and rotating shaft components in industrial power transmission assemblies. It helps prevent bearing movement and component back-off caused by vibration, rotational load, and operating stress.
This locknut is designed to work with a matching W-05 multi-tang lockwasher. Once the locknut is tightened, one washer tang is bent into one of the nut slots to create a positive mechanical lock.
Key Features
- Industry-standard slotted bearing locknut.
- Part number: N-05.
- Alternate typed formats: N05 and N 05.
- Imperial thread profile: 0.969 in. x 32 TPI.
- Four-slot outer rim for hook spanner or impact spanner wrench use.
- Used for bearing retention, shaft positioning, and adapter sleeve assemblies.
- Designed to pair with a matching W-05 lockwasher.
- Commonly used with compatible S-05 adapter sleeve assemblies where specified.
- Helps prevent loosening in rotating equipment and vibration-prone applications.
Technical Specifications
- Locknut type: threaded bearing / shaft locknut
- Part number: N-05
- Thread profile: 0.969 in. x 32 TPI
- Outer diameter: 1.500 in. / 1-1/2 in. / approximately 38.10 mm
- Face diameter: 1.250 in.
- Thickness / width: 0.354 in. / approximately 9.0 mm
- Slot count: 4 outer locking slots
- Required lockwasher: W-05 series
- Compatible adapter sleeve reference: S-05 where specified
- Standard reference: ANSI / ABMA-style industrial bearing locknut dimensions
Application Compatibility
Common application context includes bearing and shaft assemblies where N-05, N05, N 05, or an approved equivalent is specified, including:
- Industrial bearing retention assemblies.
- S-05 adapter sleeve installations.
- Gearbox and rotating shaft equipment.
- Pump, motor, fan, and machinery bearing locations.
- Power transmission shaft assemblies.
- Shaft-mounted component retention where a slotted locknut and tang washer system is required.
Use this locknut only where the shaft thread, bearing arrangement, adapter sleeve, lockwasher size, and equipment service manual confirm N-05 compatibility.
Fitment Notice
Confirm thread size, shaft diameter, adapter sleeve series, 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 locknut requires the matching W-05 lockwasher and a shaft or adapter sleeve arrangement designed for the washer’s internal tang. Without the correct lockwasher and keyway setup, the nut 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 into the nut slot.
A worn 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, lockwasher area, and adapter sleeve before installation. Thread the nut on by hand first to confirm proper engagement, then tighten with the correct hook spanner, impact spanner, or approved bearing service tool according to the equipment manufacturer’s bearing setting procedure.
Install the matching W-05 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-05 — primary locknut reference
- N05 — alternate typed format
- N 05 — alternate spacing format
- SKF N 05 — cross-reference reference; verify dimensions
- Timken N05 — cross-reference reference; verify dimensions
- Timken TN05 — cross-reference reference; verify dimensions
- NTN N05 — cross-reference reference; verify dimensions
- FAG N05 — cross-reference reference; verify dimensions
- W-05 — matching lockwasher reference
- S-05 — related adapter sleeve reference; verify bearing and shaft assembly
Parts Desk Insight
The critical checks are the 0.969 in. x 32 TPI thread, the matching W-05 lockwasher, and the shaft or sleeve keyway needed for the washer tang. The locknut provides the bearing retention force, while the lockwasher creates the mechanical anti-rotation lock.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
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.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.