Semi-Trailer Tapered Spindle 85
If you need a durable and high-performance replacement for your semi-trailer’s 85 mm tapered spindle, you’ve come to the right place.
Expertly machined from 1040 unalloyed steel and enhanced through precision induction heating, our semi-trailer tapered spindles are designed for maximum strength, impact resistance, and weight distribution. The tapered design allows for even stress distribution, reducing axle fatigue and bearing wear, making it an ideal choice for heavy freight applications.
Each Semi-Trailer Tapered Spindle 85 is thoroughly inspected, carefully packed, and shipped from our North American warehouse. The package includes an ABS mount and a front breather cap for a hassle-free installation.
Don’t forget: This spindle requires an 85 Series Sleeve.
In stock
| Type: | Tapered trailer spindle |
| Recommended Fit For: | Semi-trailers with tapered spindles and 5" axle tube |
| Heat Treatment: | Yes |
| Weight: | 45 lbs |
| Warranty: | 1 Year Limited Warranty |
| Compatible Parts: | Outer Bearing 413 (HM212049-HM212011), Inner bearing 414 (HM218210 & HM218248), National Seal 370025A, Pro-Torque Lock nut 447-4743 |
In stock
Description
When it comes to semi-trailer maintenance, choosing quality parts is crucial to maximizing performance and longevity. Our Semi-Trailer Tapered Spindle 85 is built to handle heavy loads, rough roads, and high-speed operations with superior durability and efficiency.
Engineered for Longevity – Manufactured from high-strength 1040 steel, this spindle is resistant to corrosion, wear, and impact, ensuring long-term reliability.
Precision Machining – The bearing surfaces are expertly machined for seamless bearing fitment, reducing vibration and premature wear.
Tapered Design for Performance – Unlike parallel spindles, which require exact bearing sizes, this semi-trailer spindle accommodates two different tapered roller bearings, allowing it to handle both radial and axial forces for better load stability and overall trailer performance.
Improved Axle & Braking Efficiency – Designed to minimize downtime, this spindle replacement enhances shock absorption, extends axle life, and improves braking efficiency, making it an excellent upgrade for commercial trailers.
Trusted by fleet maintenance specialists, independent truckers, and logistics companies, our Semi-Trailer Tapered Spindle 85 is the go-to replacement for routine maintenance and emergency repairs.
Required Tools
Having the right tools and equipment is key to a successful installation. This list covers essential equipment that most shops already have, but we recommend taking a moment to ensure everything is on hand before beginning.
Safety Equipment
- Flashlight
- Safety Glasses
- Face Shield
- Welding Helmet
- Ear Plugs
- Cotton Heavy Duty Thick Welding Gloves
Measuring Tools
- Digital Caliper 0-6"/150mm
- Measuring Tape and Ruler
- Trailer Measuring Tool for Parallel and Tapered (shipped with practice spindles for product demo)
Hand Tools
- Sledge Hammer
- Chipping Hammer
Specialized Tools
- Stemco Seal Driver with Tube, Part: 555-0001
- STEMCO STE 555-5039 H0
Gas and Tanks
- Acetylene and Oxygen Tanks
Power Tools & Accessories
- 5" Electric Grinder or Battery Powered
- 5" Wire Wheels
- Cutting and Grinding Discs (5" or less)
- Makita GS6000 6" Straight Grinder
- Air Die Grinder (or electric)
- Welding Machine (MIG or Stick)
- Welding Rods 7018
- Cutting Torch and Heating Torch Set (Heavy Duty)
- Shop Fan (Battery or Electric to cool down spindle after installation)
Lubricants, Fluids, & Paints
- Red-Tac EP2 Grease
- Black Rust Paint
Semi-Trailer Tapered Spindle 85 – Frequently Asked Questions
How can I determine which spindle is installed on my trailer?
Visually confirm if your trailer has a tapered or parallel spindle, check the bearing numbers and dimensions on your axle assembly. You can also:
- Measure the axle tube diameter, spindle nose, and bearing seat to identify
the correct spindle size. - Refer to your trailer’s OEM documentation for axle specifications.
- Use our Spindle Wizard tool to match your axle setup with the right
replacement spindle and sleeve. Read our recent article for more details.
Is the installation process the same for the Tapered 85 Spindle and the Tapered 115 Spindle?
The Tapered 85 Spindle and Tapered 115 Spindle follow the same installation process, but they are designed for different axle tube diameters and bearing configurations. The Tapered 85 Spindle is built for 85 mm axle tubes, while the Tapered 115 Spindle accommodates larger 115 mm axle tubes. Due to this size difference, the 115 mm version requires different torque settings and additional adjustments to ensure a precise and secure fit.
Is this the right spindle for the job?
Not sure if this will fit your trailer?
The Semi-Trailer Tapered Spindle 85 features a 85mm outer diameter, and is for trailers with a 5 inch axle tube. This spindle is compatible with:
- Outer Bearing 413 (HM212049-HM212011)
- Inner bearing 414 (HM218210 & HM218248)
- National Seal 370025A
- Pro-Torque Lock nut 447-4743
If you’re still in doubt, contact us and we’ll help you find the right product.
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