Semi-Trailer Parallel Spindle 85
If you’re looking for a durable, high-performance replacement for your semi-trailer’s parallel spindle, you’ve come to the right place. Designed for 5” OD axle tubes, the Semi-Trailer Parallel Spindle 85 is precision-machined from 1040 unalloyed steel and toughened through induction heat treatment for exceptional strength and longevity.
This OEM-compatible spindle ensures even load distribution, smooth wheel rotation, and consistent performance under heavy loads and long-haul conditions. Trusted across utility trailers, cargo haulers, and commercial fleets, it delivers unmatched durability and reliability.
Each Semi-Trailer Parallel Spindle 85 is carefully inspected, securely packed, and shipped from our North American warehouse. The package includes an ABS mount and a front breather cap for seamless installation.
Don’t forget: This spindle requires an 85 Series Sleeve.
In stock
| Type: | Parallel trailer spinlde |
| Recommended Fit For: | Semi-trailers with parallel spindles and 5" axle tube |
| Heat Treatment: | Yes |
| Weight: | 45 lbs |
| Warranty: | 1 Year Limited Warranty |
| Compatible Parts: | Outer bearing set 415, Timken inner bearing set 415, National seal 370065A, Pro-Torque Lock nut 447-4723 |
In stock
Description
Designed for demanding road conditions, the Semi-Trailer Parallel Spindle 85 offers reinforced strength, extended lifespan, and reduced maintenance costs for fleet operators and independent truckers.
Engineered for Heavy Loads – Built to withstand continuous braking, high-speed operation, and extreme environments, ensuring long-term performance.
Wide Compatibility – Designed for Meritor, Dana Spicer, Eaton, and other major axle brands, making it a versatile option for a variety of semi-trailers and cargo haulers.
Precision Fit & Load Distribution – The parallel design supports consistent bearing placement, reducing stress on axle components and minimizing downtime.
Protection & Efficiency – The front breather cap prevents contamination, while the ABS mount ensures proper sensor alignment for enhanced braking performance.
Whether you’re hauling equipment, cargo, or vehicles, the Semi-Trailer Parallel Spindle 85 provides the strength, reliability, and efficiency needed to keep your trailer running smoothly.
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 GS5000 5" 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 Parallel Spindle
Parallel spindles have a uniform, cylindrical shape with the same diameter along the entire length of the spindle. This straightforward design simplifies manufacturing and provides consistent performance, making it easier to balance loads and maintain stability.
The parallel shape is compatible with ball bearings or cylindrical roller bearings, which are excellent at handling radial loads. This makes parallel spindles well-suited for trailers that carry lighter, more consistent loads, such as utility trailers, car haulers, and some dry van or box trailers.
Parallel spindles typically require less frequent maintenance due to their simpler design and fewer components. However, it’s still essential to perform regular inspections and ensure proper lubrication to maintain their longevity and reliability.
Is this the right spindle for the job?
Not sure if this will fit your trailer?
The Semi-Trailer Parallel Spindle 85 features a 85mm outer diameter, and is for trailers with a 5 inch axle tube. This spindle is compatible with:
- Outer bearing set 415
- Timken inner bearing set 415
- National seal 370065A
- Pro-Torque Lock nut 447-4723
If you’re still in doubt, contact us and we’ll help you find the right product.
Semi-Trailer Parallel Spindle 85 – Frequently Asked Questions
Do I need special tools for trailer spindle replacement?
Most installations can be completed using common shop tools, but precision alignment and torque settings are essential for a proper fit. We recommend reviewing the Required Tools tab in the product description to ensure you have everything needed for a secure and long-lasting installation. If you’re unsure about handling the installation yourself, use our Facility Finder to locate a spindle specialist near you.
Can your spindles be used for boat trailers?
No. Our Semi-Trailer Parallel Spindles are specifically engineered for commercial trucking applications, including dry vans, flatbeds, cargo trailers, and reefers.
Related products
Important: This spindle requires a sleeve!
Don't forget to add a sleeve to your cart before checking out when purchasing 75, 85 or 115 Trailer Spindle models.
To learn more, watch full trailer spindle removal and installation videos:
Our Spindle Wizard will help you pair the perfect sleeve for your trailer spindle. Click below to launch the wizard.
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