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Lawn mower blade spindle assembly. *4 Self tapping screws included. Mounting holes are not threaded see Part Replacement video for thread tapping information

Riding lawn mower blade spindle assembly. Fits 5 star blade mounting holes. Mounting holes are not pre-threaded, new self tapping mounting screw are recommended. See related parts.

Spindle assembly, left

Lawn mower blade spindle (mandrel) assembly. 5 Point Star. The bolt holes do not come tapped. Comes with self-tapping screws.

Lawnmower blade spindle assembly, 5 Point Star. Bolt holes do not come tapped. Order self tapping bolts as well. See related item below.

Spindle assembly, right

Lawn mower spindle housing with bearings. If one or more of the blades to not turn properly, then the spindle could be worn or damaged.

Lawn mower spindle assembly with pulley (6.3 DIA). The spindle assembly drives the lawn mower's blades. Be aware that the four mounting holes are not threaded—you will need to order four self-tapping screws.

Lawn mower mandrel (or spindle) kit with nut.

Blade spindle assembly with pulley

Lawn mower mandrel assembly (also called a spindle assembly). The mandrel assembly drives the lawn mower blades. NOTE: The bolt holes do not come tapped. You will need to order self-tapping screws.

Lawn mower spindle housing. Be aware you will need new self-tapping screws as the mounting holes are not threaded.

Riding lawn mower blade spindle with pulley. You will need to order new screws to mount the replacement spindle as the mounting holes are not threaded.

Riding lawn mower blade spindle assembly. Mounting holes are not threaded, re-use original self-tapping screws to install.

Lawn mower blade spindle assembly with pulley
A worn spindle bearing or damaged spindle assembly creates dangerous blade wobble and uneven cuts. Genuine OEM Craftsman spindle parts from Repair Clinic include complete spindle assemblies, replacement bearings, and hardware engineered for your exact mower model. These are the same parts Craftsman uses at the factory — no compromises on fit or durability.
Spindle failure accelerates when you ignore early warning signs like vibration or noise. Replace spindles promptly to maintain deck integrity and blade safety. Browse our Craftsman lawn mower spindle parts by your model number today.
A spindle assembly is the complete unit that holds the blade shaft — it includes the spindle housing, bearings, seals, and fastening hardware. A spindle bearing is just the rolling element inside. Most Craftsman owners replace the full assembly because it's labor-efficient and ensures all parts are in factory condition.
Spindle bearings on a well-maintained Craftsman typically last 5–7 years with regular greasing and storage in dry conditions. Wet storage, corrosion, or lack of maintenance can halve that lifespan. If you hear grinding or notice blade flutter, don't wait — a failed spindle can damage the deck or cause unsafe blade separation.
Yes. OEM Craftsman spindle replacements use the same pulley diameter and bore as the original, so your existing belt and drive system will fit without adjustment. Always verify the spindle part number matches your model to confirm compatibility.
Locate your model number on the mower deck or frame — usually near the engine or under the seat. Some Craftsman models use left-side and right-side spindles interchangeably, while others have unique parts. Enter your model number in Repair Clinic's lookup tool to confirm you're ordering the exact spindle needed.


Keep your Craftsman lawn mower running efficiently by replacing a faulty spindle promptly. With same-day shipping on most in-stock items, you'll have your replacement part fast, minimizing downtime. Our model/part number lookup finds the exact OEM part for your unit, and every order is backed by our 365-day return policy and price-match guarantee. If your Craftsman lawn mower spindle is failing — showing symptoms like reduced performance, unusual noise, or complete non-operation — replacement is typically the fastest fix. Browse our full library of Craftsman repair resources for troubleshooting guides and installation videos.
On Craftsman lawn mowers, look for the model number on a label attached to the mower deck or frame, often near the engine. Riding models may place it under the seat or on the rear fender. Clean dirt from the label and copy every letter and number, including punctuation, because similar Craftsman model numbers can identify different equipment. Put that model number into the search bar to narrow the entire catalog to parts built for your mower, not just spindle parts. The filtered results give you a faster, more accurate match and reduce the chance of ordering a part that does not fit.

Repair Clinic makes Craftsman Lawn Mower repair straightforward with a deep online library of videos, guides, and diagnostic articles. Step-by-step written instructions cover disassembly, testing, and reassembly, and the video library shows the same work in action so you can follow along. Use the model number lookup to confirm the exact OEM part, and wiring diagrams and part testing walkthroughs support the more technical steps.

Repair Clinic has five ways for you to stop your lawn mower from leaking gas. Before we get to those, let's review how the gasoline you pour into the tank powers the mower.

Why does your lawn mower battery keep dying? Repair Clinic has done the research and this article will provide some answers, starting with what a battery's purpose is on a gas-powered lawn mower.

What's causing that black smoke to billow out of the engine? There are three likely reasons and they are all related to how a gas-powered lawn mower engine operates.