Skip to content 
Semi-Trailer Tapered Spindle 115
If you’re looking for a reliable replacement for your semi-trailer’s tapered spindles, you’ve come to the right place.
Expertly machined from 1040 steel and enhanced through precision induction heating, our semi-trailer tapered spindles provide the strength and durability you’ve come to expect from all our products.
Each semi-trailer tapered spindle is thoroughly inspected, carefully packed, and shipped from our North American warehouse. The package includes an ABS mount, front breather cap, and a comprehensive installation manual.
In stock
Please login or sign up now to view product prices and begin shopping.
| 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 |
In stock
Description
When it comes to maintaining the longevity and performance of your semi-trailer, choosing the right parts is crucial. Our semi-trailer tapered spindles are not only crafted from high-quality, unalloyed 1040 steel but also undergo a unique heat treatment to increase their hardness and strength where it counts most. By applying induction heating to the bearing area of our spindles, it ensures they can reliably withstand the demanding conditions of the road, day after day.
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
- Cutting Fluid
- Brake Cleaner
- Black Rust Paint
The average lifespan of a semi-trailer in North America is between 10 to 15 years, depending on factors like maintenance, road conditions, and usage. Using high-quality replacement parts, such as our tapered spindles, is a great way to maximize a trailer’s lifespan and service.
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.
Spindle Maintenance
Do You Have a Problematic Spindle?
Wheel bearing maintenance is a crucial yet often overlooked aspect of commercial vehicle upkeep. Many truck and trailer owners are unaware of the importance of regular wheel bearing checks and lubrication changes. If neglected, this can lead to damaged spindles and dangerous situations as break pads can become compromised by leaking bearing lubricants and grease.
When inspecting your truck or trailer for signs of trouble, listen for unusual noises like whirring, clicking, or clunking, particularly while turning. Unusual vibrations can also be an indicator as well as visual signs like bearing grease leaking from the boot. A quick visual inspection of the inner side of the wheel’s rim will help identify any issues.
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)
- Wheel Seal 370025A
- Lock nut 447-4743
If you’re still in doubt, contact us and we’ll help you find the right product.
