Semi-Trailer Tapered Spindle 115
If you need a heavy-duty replacement spindle for semi-trailers and commercial trucking applications, the Semi-Trailer Tapered Spindle 115 is built to handle the most demanding loads and road conditions. Designed for 5 ¾” axle tubes, this spindle is precision-machined for a seamless fit with SAF-Holland, Meritor, Hendrickson, and Dexter axle assemblies.
Crafted from heat-treated 1040 unalloyed steel, this OEM-compatible spindle delivers exceptional strength, impact resistance, and long-term durability—perfect for high-load freight transportation, flatbeds, tanker trailers, and bulk haulers. With a 40-ton weight capacity, it ensures reliable load distribution, smooth wheel rotation, and handling under extreme stress.
Each Semi-Trailer Tapered Spindle 115 is thoroughly inspected, carefully packed, and shipped from our North American warehouse. The package includes an ABS mount and a front breather cap for easy installation.
Don’t forget: This spindle requires a 115 Series Sleeve.
In stock
| Type: | Tapered trailer spindle |
| Recommended Fit For: | Semi-trailers with tapered spindles and 5 3/4" 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
The Semi-Trailer Tapered Spindle 115 is engineered for maximum durability and efficiency, making it an ideal choice for long-haul, high-stress trucking operations. The tapered design evenly distributes stress, reducing axle fatigue and extending component life.
Built for Strength & Longevity – Manufactured from heat-treated, high-strength steel, this spindle is designed to withstand rough roads, high axle loads, and heavy freight demands.
Precision Engineering – Careful machining ensures a perfect fit within axle configurations, eliminating misalignment issues and reducing long-term wear on bearings and hubs.
Enhanced Load Handling – Tapered design supports stronger bearings, improves shock absorption, and minimizes rolling resistance—ultimately leading to better fuel economy and lower operational costs.
Corrosion & Wear Resistance – With its durable finish, this spindle resists corrosion, impact damage, and harsh weather conditions, making it a trusted solution for fleet maintenance specialists and logistics companies.
Built to handle off-road applications, rough terrain, and extreme weather, the Semi-Trailer Tapered Spindle 115 is a proven choice for operators looking to extend axle life and optimize vehicle performance.
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 Tapered Spindle
Tapered spindles have a conical shape, meaning they are wider at the base and gradually taper off towards the end. This design helps evenly distribute weight and reduces stress on both the axle and bearings.
The tapered shape allows for the use of tapered roller bearings, which can handle both radial and axial loads (side thrusts). This makes them ideal for trailers that need to carry heavy loads, such as flatbeds, tankers, and refrigerated trailers.
However, tapered spindles generally require more frequent maintenance checks due to their complexity. It is important to ensure that the tapered roller bearings are properly lubricated to avoid premature failure.
Is this the right spindle for the job?
Not sure if this will fit your trailer?
The Semi-Trailer Tapered Spindle 115 features a 115mm outer diameter, and is for trailers with a 5 3/4 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.
Semi-Trailer Tapered Spindle 115 – Frequently Asked Questions
How does improper lubrication affect spindle lifespan?
Without proper lubrication, the spindle experiences increased friction, overheating, and accelerated wear. Over time, this can lead to bearing failure, misalignment, and costly axle repairs. To maximize spindle longevity and ensure trouble-free operation, regular maintenance with high-quality lubricants is essential.
If my OEM axle spindle is tapered, can I replace it with a parallel spindle?
No, replacing a tapered spindle with a parallel spindle is not recommended. Tapered spindles are specifically designed to work with tapered roller bearings, ensuring even stress distribution and optimal performance. Switching to a parallel spindle can lead to uneven stress, reduced bearing life, and potential axle instability, compromising vehicle safety and efficiency.
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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